ListView with CheckBoxes

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <ListView
        android:choiceMode="multipleChoice"
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </ListView>

</LinearLayout>

MainActivity.java

package in.blogspot.kantapp.listviewwithcheckboxes;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnItemClickListener {
    String[] ITEMS = { "item1", "item2", "item3", "item4", "item5", "item6",
            "item7", "item8", "item9", "item10" };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ListView listView = (ListView) findViewById(R.id.listView);

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_multiple_choice, ITEMS);

        listView.setAdapter(adapter);

        listView.setOnItemClickListener(this);
    }

    @Override
    public void onItemClick(AdapterView<?> adapterView, View arg1,
                            int position, long arg3) {
        ListView listview = (ListView) adapterView;

        if (listview.isItemChecked(position)) {
            Toast.makeText(getApplicationContext(),
                    adapterView.getItemAtPosition(position) + " Checked",
                    Toast.LENGTH_LONG).show();
        } else {
            Toast.makeText(getApplicationContext(),
                    adapterView.getItemAtPosition(position) + " Un Checked",
                    Toast.LENGTH_LONG).show();
        }
    }

}

Internal Storage Example in Android

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_gravity="center"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="enter file name:"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <EditText
        android:id="@+id/editText_filename"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="textPersonName" >

        <requestFocus />
    </EditText>

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="enter text to save"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <EditText
        android:id="@+id/editText_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="textPersonName" />

    <Button
        android:id="@+id/button_save"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginTop="20dp"
        android:text="Create file and save text" />

    <Button
        android:id="@+id/button_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginTop="20dp"
        android:text="view text from saved file" />

    <TextView
        android:id="@+id/textView_display"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginTop="20dp"
        android:textAppearance="?android:attr/textAppearanceLarge" />

</LinearLayout>

MainActivity.java

package in.blogspot.kantapp.internalstorageexampleinandroid;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class MainActivity extends Activity {
    private EditText editFile, editText;
    private TextView text;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        editFile = (EditText) findViewById(R.id.editText_filename);
        editText = (EditText) findViewById(R.id.editText_text);
        text = (TextView) findViewById(R.id.textView_display);

        Button saveBtn = (Button) findViewById(R.id.button_save);
        Button viewBtn = (Button) findViewById(R.id.button_view);

        saveBtn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                String fileName = editFile.getText().toString();
                String textToSave = editText.getText().toString();

                try {
                    FileOutputStream fos = openFileOutput(fileName + ".txt",
                            MODE_PRIVATE);

                    fos.write(textToSave.getBytes());

                    fos.close();

                    Toast.makeText(getApplicationContext(),
                            "file created and text saved", Toast.LENGTH_LONG)
                            .show();
                } catch (FileNotFoundException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        });

        viewBtn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                try {
                    FileInputStream fis = openFileInput(editFile.getText()
                            .toString() + ".txt");

                    StringBuffer sb = new StringBuffer();

                    int i;

                    while ((i = fis.read()) != -1) {

                        sb.append((char) i);
                    }

                    fis.close();

                    text.setText(sb.toString());
                } catch (FileNotFoundException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

            }
        });
    }
}

AlertDialog with List

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <Button
        android:id="@+id/button_alertDialogList"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="98dp"
        android:text="Dialog List" />

</RelativeLayout>

MainActivity.java

package in.blogspot.kantapp.alertdialogwithlist;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button showDialog = (Button) findViewById(R.id.button_alertDialogList);

        showDialog.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                final String[] names = getResources().getStringArray(
                        R.array.mobileplatforms);

                AlertDialog.Builder builder = new AlertDialog.Builder(
                        MainActivity.this);

                builder.setTitle(R.string.names);

                builder.setItems(R.array.mobileplatforms,
                        new DialogInterface.OnClickListener() {

                            @Override
                            public void onClick(DialogInterface arg0, int index) {
                                // TODO Auto-generated method stub
                                switch (index) {
                                    case 0:
                                        Toast.makeText(getApplicationContext(),
                                                names[index] + " Selected",
                                                Toast.LENGTH_LONG).show();
                                        break;

                                    case 1:
                                        Toast.makeText(getApplicationContext(),
                                                names[index] + " Selected",
                                                Toast.LENGTH_LONG).show();
                                        break;
                                    case 2:
                                        Toast.makeText(getApplicationContext(),
                                                names[index] + " Selected",
                                                Toast.LENGTH_LONG).show();
                                        break;
                                }

                            }
                        });

                AlertDialog alertList = builder.create();

                alertList.show();

            }
        });
    }

}

string.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">AlertDialog with List</string>
    <string name="action_settings">Settings</string>
    <string name="hello_world">Hello world!</string>
    <string name="names">Mobile Platforms</string>
    <string-array name="mobileplatforms">
        <item >Android</item>
        <item >iPhone</item>
        <item >BlackBerry</item>
    </string-array>

</resources>

Running Activity only in portrait mode

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="in.blogspot.kantapp.runningactivityonlyinlandscapemode">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"

        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity"
            android:screenOrientation="portrait">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Running Activity only in Landscape mode

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="in.blogspot.kantapp.runningactivityonlyinlandscapemode">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"

        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity"
            android:screenOrientation="landscape">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Icon GridView in Android

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <GridView
        android:id="@+id/gridView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:numColumns="3" >
    </GridView>

</LinearLayout>

MainActivity.java

package in.blogspot.kantapp.icongridviewinandroid;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        GridView grid = (GridView) findViewById(R.id.gridView1);

        grid.setAdapter(new ImageAdapter());

    }

    class ImageAdapter extends BaseAdapter {

        @Override
        public int getCount() {
            // TODO Auto-generated method stub
            return images.length;
        }

        @Override
        public Object getItem(int arg0) {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public long getItemId(int arg0) {
            // TODO Auto-generated method stub
            return 0;
        }

        @Override
        public View getView(int arg0, View arg1, ViewGroup arg2) {
            // TODO Auto-generated method stub
            ImageView image = new ImageView(MainActivity.this);

            image.setImageResource(images[arg0]);

            return image;
        }

    }

    int[] images = {R.mipmap.ic_launcher, R.mipmap.ic_launcher,
            R.mipmap.ic_launcher, R.mipmap.ic_launcher,
            R.mipmap.ic_launcher, R.mipmap.ic_launcher,
            R.mipmap.ic_launcher, R.mipmap.ic_launcher,
            R.mipmap.ic_launcher, R.mipmap.ic_launcher,
            R.mipmap.ic_launcher, R.mipmap.ic_launcher,
            R.mipmap.ic_launcher, R.mipmap.ic_launcher,
            R.mipmap.ic_launcher, R.mipmap.ic_launcher};
}

Show Contextual Menu ActionMode

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <Button
        android:id="@+id/button_contextualmenu"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="166dp"
        android:text="Show Contextual Menu" />

</RelativeLayout>

MainActivity.java

package in.blogspot.kantapp.contextualmenuactionmode;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.view.ActionMode;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

@SuppressLint("NewApi")
public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button b = (Button) findViewById(R.id.button_contextualmenu);

        b.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                startActionMode(mActionModeCallback);
            }
        });

    }

    @SuppressLint("NewApi")
    private ActionMode.Callback mActionModeCallback = new ActionMode.Callback() {

        // Called when the action mode is created; startActionMode() was called
        @Override
        public boolean onCreateActionMode(ActionMode mode, Menu menu) {
            // Inflate a menu resource providing context menu items
            MenuInflater inflater = mode.getMenuInflater();
            inflater.inflate(R.menu.main, menu);
            return true;
        }

        // Called each time the action mode is shown. Always called after
        // onCreateActionMode, but
        // may be called multiple times if the mode is invalidated.
        @Override
        public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
            return false; // Return false if nothing is done
        }

        // Called when the user selects a contextual menu item
        @Override
        public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
            switch (item.getItemId()) {
                case R.id.item1:
                    Toast.makeText(getApplicationContext(), "item1 selected",
                            Toast.LENGTH_SHORT).show();
                    break;
                case R.id.item2:
                    Toast.makeText(getApplicationContext(), "item2 selected",
                            Toast.LENGTH_SHORT).show();
                    break;
                case R.id.item3:
                    Toast.makeText(getApplicationContext(), "item3 selected",
                            Toast.LENGTH_SHORT).show();
                    break;
            }
            return false;
        }

        @Override
        public void onDestroyActionMode(ActionMode arg0) {
            // TODO Auto-generated method stub

        }

    };

}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >

    <item
        android:id="@+id/item1"
        android:orderInCategory="100"
        android:showAsAction="ifRoom|withText"
        android:title="ITEM 1"/>
    <item
        android:id="@+id/item2"
        android:orderInCategory="100"
        android:showAsAction="ifRoom|withText"
        android:title="ITEM 2"/>
    <item
        android:id="@+id/item3"
        android:orderInCategory="100"
        android:showAsAction="ifRoom|withText"
        android:title="ITEM 3"/>

</menu>

List Fragment Event Handling using onListItemClick

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >

    <fragment
        android:id="@+id/fragment1"
        android:name="in.blogspot.kantapp.listfragmenteventhandlingusingonlistitemclick.MonthsListFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:layout="@layout/simple_list_item_1" />

</LinearLayout>

MainActivity.java

package in.blogspot.kantapp.listfragmenteventhandlingusingonlistitemclick;

import android.app.Activity;
import android.os.Bundle;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

}

MonthsListFragment.java

package in.blogspot.kantapp.listfragmenteventhandlingusingonlistitemclick;

import android.annotation.SuppressLint;
import android.app.ListFragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

@SuppressLint("NewApi")
public class MonthsListFragment extends ListFragment {
    String[] MONTHS = { "jan", "feb", "march", "april", "may", "june", "july",
            "august", "sep", "octo", "nov", "dec" };

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(
                inflater.getContext(), android.R.layout.simple_list_item_1,
                MONTHS);

        setListAdapter(adapter);

        return super.onCreateView(inflater, container, savedInstanceState);
    }

    @Override
    public void onListItemClick(ListView l, View v, int position, long id) {
        // TODO Auto-generated method stub
        super.onListItemClick(l, v, position, id);

        Toast.makeText(getActivity(), "selected month :" + MONTHS[position],
                Toast.LENGTH_LONG).show();
    }

}

Month List In Fragment Android Example

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >

    <fragment
        android:id="@+id/fragment1"
        android:name="in.blogspot.kantapp.monthlistinfragmentandroidexample.MonthsListFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

MainActivity.java

package in.blogspot.kantapp.monthlistinfragmentandroidexample;

import android.app.Activity;
import android.os.Bundle;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

}

MonthListFragment.java

package in.blogspot.kantapp.monthlistinfragmentandroidexample;

/**
 * Created by kanta on 02-Jun-16.
 */
import android.annotation.SuppressLint;
import android.app.ListFragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;

@SuppressLint("NewApi")
public class MonthsListFragment extends ListFragment {
    String[] MONTHS = { "jan", "feb", "march", "april", "may", "june", "july",
            "august", "sep", "octo", "nov", "dec" };

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(
                inflater.getContext(), android.R.layout.simple_list_item_1,
                MONTHS);

        setListAdapter(adapter);

        return super.onCreateView(inflater, container, savedInstanceState);
    }

}

Spinner in Android Months

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <Spinner
        android:id="@+id/spinner1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

MainActivity.java

package in.blogspot.kantapp.spinnerinandroidmonths;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;

public class MainActivity extends Activity implements OnItemSelectedListener {
    String[] MONTHS = { "jan", "feb", "march", "april", "may", "june", "july",
            "august", "sep", "octo", "nov", "dec" };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Spinner spinner = (Spinner) findViewById(R.id.spinner1);

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(
                getApplicationContext(), R.layout.text, MONTHS);

        spinner.setAdapter(adapter);

        spinner.setOnItemSelectedListener(this);
    }

    @Override
    public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
                               long arg3) {
        // TODO Auto-generated method stub
        Toast.makeText(getApplicationContext(),
                "Item selected is :" + MONTHS[arg2], Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onNothingSelected(AdapterView<?> arg0) {
        // TODO Auto-generated method stub

    }

}

text.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textColor="#000000"
    android:textSize="25sp">

</TextView>

Number Picker Dialog

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <NumberPicker
        android:id="@+id/numberPicker1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="78dp" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true"
        android:layout_marginLeft="40dp"
        android:text="Show Selected Number" />

</RelativeLayout>

MainActivity.java

package in.blogspot.kantapp.numberpickerdialog;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.NumberPicker;
import android.widget.Toast;

public class MainActivity extends Activity {
    NumberPicker np;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        np = (NumberPicker) findViewById(R.id.numberPicker1);

        np.setMaxValue(31);
        np.setMinValue(1);

        Button b = (Button) findViewById(R.id.button1);

        b.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                int number = np.getValue();

                Toast.makeText(getApplicationContext(),
                        "value is :" + number, Toast.LENGTH_LONG).show();

            }
        });

    }

}

ActionBar Menu

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

</RelativeLayout>

MainActivity.java

package in.blogspot.kantapp.actionbarmenu;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.delitem:
                Toast.makeText(getApplicationContext(), "Delete Selected",
                        Toast.LENGTH_SHORT).show();
                break;

            case R.id.updateitem:
                Toast.makeText(getApplicationContext(), "Update Selected",
                        Toast.LENGTH_SHORT).show();
                break;
        }
        return super.onOptionsItemSelected(item);
    }
}

main.xml(Under manu folder)

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >

    <item
        android:id="@+id/updateitem"
        android:orderInCategory="100"
        android:showAsAction="ifRoom|withText"
        android:title="@string/updateItemText"/>
    <item
        android:id="@+id/delitem"
        android:orderInCategory="100"
        android:showAsAction="ifRoom|withText"
        android:title="@string/DeleteItemText"/>

</menu>

string.xml

<resources>
    <string name="app_name">ActionBar Menu</string>
    <string name="action_settings">Settings</string>
    <string name="hello_world">Hello world!</string>
    <string name="updateItemText">Update</string>
    <string name="DeleteItemText">Delete</string>
</resources>

Custom ListView with ImageView

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <ListView
        android:id="@+id/listView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </ListView>

</LinearLayout>

MainActivity.java

package in.blogspot.kantapp.customlistviewwithimageview;

import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ListView list = (ListView) findViewById(R.id.listView1);
        customadapter ca = new customadapter();
        list.setAdapter(ca);

    }

    class customadapter extends BaseAdapter {

        @Override
        public int getCount() {
            // TODO Auto-generated method stub
            return images.length;
        }

        @Override
        public Object getItem(int arg0) {
            // TODO Auto-generated method stub

            return null;
        }

        @Override
        public long getItemId(int arg0) {
            // TODO Auto-generated method stub
            return 0;
        }

        @Override
        public View getView(final int position, View convertview, ViewGroup arg2) {
            // TODO Auto-generated method stub
            LayoutInflater inflater = getLayoutInflater();
            convertview = inflater.inflate(R.layout.custom, null);
            TextView tv = (TextView) convertview.findViewById(R.id.textView1);
            TextView tv1 = (TextView) convertview.findViewById(R.id.textView2);
            ImageView image = (ImageView) convertview
                    .findViewById(R.id.imageView1);
            tv.setText(names[position]);
            tv1.setText(locations[position]);
            image.setImageResource(images[position]);

            return convertview;
        }

    }

    String[] names = { "Android", "Birthday", "Cloud", "Smile", "Education" };
    String[] locations = { "location1", "location2", "location3", "location4",
            "location5" };
    int[] images = { R.drawable.android, R.drawable.birthday, R.drawable.cloude,
            R.drawable.smile, R.drawable.education };
}

custom.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true" >


        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_alignParentTop="true"

            android:orientation="vertical" >

            <TextView
                android:id="@+id/textView1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Large Text"
                android:textAppearance="?android:attr/textAppearanceLarge" />

            <TextView
                android:id="@+id/textView2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Large Text"
                android:textAppearance="?android:attr/textAppearanceLarge" />

        </LinearLayout>

        <ImageView
            android:id="@+id/imageView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_alignParentTop="true"
            android:layout_marginRight="25dp"
            android:src="@drawable/birthday"
            android:layout_gravity="top|left"
            />

    </RelativeLayout>

</LinearLayout>

Downloading Image in Android

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="72dp"
        android:layout_marginTop="74dp"
        />

</RelativeLayout>

MainActivity.java

package in.blogspot.kantapp.downloadingimageinandroid;

import android.app.Activity;
import android.app.ProgressDialog;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.widget.ImageView;

import java.net.URL;
import java.net.URLConnection;

public class MainActivity extends Activity {
    private String imageURL = "http://vignette2.wikia.nocookie.net/dragonball/images/3/31/Render_Dragon_Ball_goku_M1.png/revision/latest?cb=20150412202653";
    private ImageView image;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        image = (ImageView) findViewById(R.id.imageView1);

        ImgDownload img = new ImgDownload();

        img.execute();

    }

    private class ImgDownload extends AsyncTask {
        ProgressDialog pd;
        private Bitmap pic;

        @Override
        protected void onPreExecute() {
            // TODO Auto-generated method stub
            pd = ProgressDialog.show(MainActivity.this, "downloading Image",
                    "Plz wait");

            super.onPreExecute();
        }

        @Override
        protected Object doInBackground(Object... objects) {
            try {


                URL url = new URL(imageURL);


                URLConnection conn = url.openConnection();


                pic = BitmapFactory.decodeStream(conn.getInputStream());
            } catch (Exception ex) {
            }
            return null;
        }

        @Override
        protected void onPostExecute(Object o) {
            pd.cancel();
            image.setImageBitmap(pic);
        }
    }
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="in.blogspot.kantapp.downloadingimageinandroid">
<uses-permission android:name="android.permission.INTERNET"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Disabling and Enabling Button

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="43dp"
        android:text="Display Message"
        android:textSize="20sp" />

</RelativeLayout>

MainActivity.java

package in.blogspot.kantapp.disablingandenablingbutton;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        final Button b = (Button) findViewById(R.id.button1);
        b.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {

                //Disabling button
                b.setEnabled(false);

                Toast.makeText(getApplicationContext(),
                        "Look at the button it is desabled..",
                        Toast.LENGTH_LONG).show();

            }
        });
    }

}

TimePickerDialog in Android

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <Button
        android:id="@+id/chooseTimeButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Choose Time"
        android:textSize="20dp" />

    <TextView
        android:id="@+id/displayTimeText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge" />

</LinearLayout>

MainActivity.java

package in.blogspot.kantapp.timepickerdialoginandroid;

import android.app.Activity;
import android.app.TimePickerDialog;
import android.app.TimePickerDialog.OnTimeSetListener;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.TimePicker;

import java.util.Calendar;

public class MainActivity extends Activity {
    Calendar c = Calendar.getInstance();
    TextView display;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button changeTimeBtn = (Button) findViewById(R.id.chooseTimeButton);
        display = (TextView) findViewById(R.id.displayTimeText);

        changeTimeBtn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                new TimePickerDialog(MainActivity.this, t, c
                        .get(Calendar.HOUR_OF_DAY), c.get(Calendar.MINUTE),
                        true).show();
            }
        });
    }

    TimePickerDialog.OnTimeSetListener t = new OnTimeSetListener() {

        @Override
        public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
            // TODO Auto-generated method stub
            display.setText("Choosen time is :" + hourOfDay + ":" + minute);
        }
    };

}

DatePickerDialog in Android

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <Button
        android:id="@+id/chooseDateButton"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:text="Choose Date"
        android:textSize="20dp" />

    <TextView
        android:id="@+id/displatext"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge" />

</LinearLayout>

MainActivity.java

package in.blogspot.kantapp.datepickerdialoginandroid;

import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.DatePickerDialog.OnDateSetListener;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;

import java.util.Calendar;

public class MainActivity extends Activity {
    Calendar c = Calendar.getInstance();
    TextView display;
    int cday, cmonth, cyear;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button changeDate = (Button) findViewById(R.id.chooseDateButton);
        display = (TextView) findViewById(R.id.displatext);

        changeDate.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                new DatePickerDialog(MainActivity.this, d,
                        c.get(Calendar.YEAR), c.get(Calendar.MONTH), c
                        .get(Calendar.DAY_OF_MONTH)).show();

            }
        });
    }

    DatePickerDialog.OnDateSetListener d = new OnDateSetListener() {

        @Override
        public void onDateSet(DatePicker view, int year, int monthOfYear,
                              int dayOfMonth) {

            cday = dayOfMonth;
            cmonth = monthOfYear + 1;
            cyear = year;

            display.setText("Choosen date is :" + cday + "/" + cmonth + "/"
                    + cyear);
        }
    };
}

Finding Current Location Address

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="hello world" />

</RelativeLayout>

MainActivity.java

package in.blogspot.kantapp.findingcurrentlocationaddress;

import android.Manifest;
import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.widget.TextView;

import java.io.IOException;
import java.util.List;
import java.util.Locale;

public class MainActivity extends Activity {
    double latti, longi;
    TextView display;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        display = (TextView) findViewById(R.id.text);

        LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

        LocationListener locationListener = new LocationListener() {

            @Override
            public void onStatusChanged(String provider, int status,
                                        Bundle extras) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onProviderEnabled(String provider) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onProviderDisabled(String provider) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onLocationChanged(Location location) {
                // TODO Auto-generated method stub
                latti = location.getLatitude();
                longi = location.getLongitude();

                getAddress();


            }
        };


        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            // TODO: Consider calling
            //    ActivityCompat#requestPermissions
            // here to request the missing permissions, and then overriding
            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
            //                                          int[] grantResults)
            // to handle the case where the user grants the permission. See the documentation
            // for ActivityCompat#requestPermissions for more details.
            return;
        }
        locationManager.requestLocationUpdates(
                LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);

    }

    void getAddress() {
        Geocoder gc = new Geocoder(getApplicationContext(), Locale.getDefault());

        try {
            // Addresses:A class representing an Address, i.e, a set of Strings
            // describing a location
            List<Address> addresses = gc.getFromLocation(latti, longi, 1);

            String addr = "";

            if (addresses.size() > 0) {
                for (int i = 0; i <        addresses.get(0).getMaxAddressLineIndex(); i++)
                    addr += addresses.get(0).getAddressLine(i) + "\n";
            }

            display.setText(addr);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="in.blogspot.kantapp.findingcurrentlocationaddress">

    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.INTERNET"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

SlideDrawer in Android

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
        <SlidingDrawer
    android:id="@+id/slidingDrawer1"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:content="@+id/content"
    android:handle="@+id/handle"
    android:topOffset="50dip" >
      

    <Button
        android:id="@+id/handle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/menuname" >
    </Button>
      

    <LinearLayout
        android:id="@+id/content"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="#FF444444"
        android:gravity="center"
        android:orientation="vertical" >
            

        <Button
            android:id="@+id/item1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/item1" >
        </Button>
            

        <Button
            android:id="@+id/item2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/item2">
        </Button>
            

        <Button
            android:id="@+id/item3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/item3" >
        </Button>
            

        <Button
            android:id="@+id/item4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/item4" >
        </Button>
            

        <Button
            android:id="@+id/item5"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/item5" >
        </Button>
          
    </LinearLayout>
    
</SlidingDrawer>

</LinearLayout>

MainActivity.java

package in.blogspot.kantapp.slidedrawerinandroid;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button i1 = (Button)findViewById(R.id.item1);

        i1.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                Toast.makeText(getApplicationContext(), "clicked", Toast.LENGTH_SHORT).show();
            }
        });
    }


}

string.xml

<resources>
    <string name="app_name">SlideDrawer in Android</string>
    <string name="hello_world">Hello world!</string>
    <string name="menu_settings">Settings</string>
    <string name="menuname">Menu</string>
    <string name="item1">option1</string>
    <string name="item2">option2</string>
    <string name="item3">option3</string>
    <string name="item4">option4</string>
    <string name="item5">option5</string>
</resources>

AutoCompleteTextView in Android

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <AutoCompleteTextView
        android:id="@+id/autoCompleteTextView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="enter keyword" />

    <Button
        android:id="@+id/display"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Display" />

</LinearLayout>

MainActivity.java

package in.blogspot.kantapp.autocompletetextviewinandroid;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity implements OnItemClickListener {
    String selectedname;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        AutoCompleteTextView auto = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView1);

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(
                getApplicationContext(), R.layout.textview, COUNTRIES);

        auto.setAdapter(adapter);

        auto.setOnItemClickListener(this);

        // selectedname = auto.getText().toString();

        Button display = (Button) findViewById(R.id.display);

        display.setOnClickListener(new OnClickListener() {

            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                Toast.makeText(getApplicationContext(),
                        "selected name :" + selectedname, 3000).show();

            }
        });

    }

    static final String[] COUNTRIES = new String[] { "Afghanistan", "Albania",
            "Algeria", "American Samoa", "Andorra", "Angola", "Anguilla",
            "Antarctica", "Antigua and Barbuda", "Argentina", "Armenia",
            "Aruba", "Australia", "Austria", "Azerbaijan", "Bahrain",
            "Bangladesh", "Barbados", "Belarus", "Belgium", "Belize", "Benin",
            "Bermuda", "Bhutan", "Bolivia", "Bosnia and Herzegovina",
            "Botswana", "Bouvet Island", "Brazil",
            "British Indian Ocean Territory", "British Virgin Islands",
            "Brunei", "Bulgaria", "Burkina Faso", "Burundi", "Cote d'Ivoire",
            "Cambodia", "Cameroon", "Canada", "Cape Verde", "Cayman Islands",
            "Central African Republic", "Chad", "Chile", "China",
            "Christmas Island", "Cocos (Keeling) Islands", "Colombia",
            "Comoros", "Congo", "Cook Islands", "Costa Rica", "Croatia",
            "Cuba", "Cyprus", "Czech Republic",
            "Democratic Republic of the Congo", "Denmark", "Djibouti",
            "Dominica", "Dominican Republic", "East Timor", "Ecuador", "Egypt",
            "El Salvador", "Equatorial Guinea", "Eritrea", "Estonia",
            "Ethiopia", "Faeroe Islands", "Falkland Islands", "Fiji",
            "Finland", "Former Yugoslav Republic of Macedonia", "France",
            "French Guiana", "French Polynesia", "French Southern Territories",
            "Gabon", "Georgia", "Germany", "Ghana", "Gibraltar", "Greece",
            "Greenland", "Grenada", "Guadeloupe", "Guam", "Guatemala",
            "Guinea", "Guinea-Bissau", "Guyana", "Haiti",
            "Heard Island and McDonald Islands", "Honduras", "Hong Kong",
            "Hungary", "Iceland", "India", "Indonesia", "Iran", "Iraq",
            "Ireland", "Israel", "Italy", "Jamaica", "Japan", "Jordan",
            "Kazakhstan", "Kenya", "Kiribati", "Kuwait", "Kyrgyzstan", "Laos",
            "Latvia", "Lebanon", "Lesotho", "Liberia", "Libya",
            "Liechtenstein", "Lithuania", "Luxembourg", "Macau", "Madagascar",
            "Malawi", "Malaysia", "Maldives", "Mali", "Malta",
            "Marshall Islands", "Martinique", "Mauritania", "Mauritius",
            "Mayotte", "Mexico", "Micronesia", "Moldova", "Monaco", "Mongolia",
            "Montserrat", "Morocco", "Mozambique", "Myanmar", "Namibia",
            "Nauru", "Nepal", "Netherlands", "Netherlands Antilles",
            "New Caledonia", "New Zealand", "Nicaragua", "Niger", "Nigeria",
            "Niue", "Norfolk Island", "North Korea", "Northern Marianas",
            "Norway", "Oman", "Pakistan", "Palau", "Panama",
            "Papua New Guinea", "Paraguay", "Peru", "Philippines",
            "Pitcairn Islands", "Poland", "Portugal", "Puerto Rico", "Qatar",
            "Reunion", "Romania", "Russia", "Rwanda", "Sqo Tome and Principe",
            "Saint Helena", "Saint Kitts and Nevis", "Saint Lucia",
            "Saint Pierre and Miquelon", "Saint Vincent and the Grenadines",
            "Samoa", "San Marino", "Saudi Arabia", "Senegal", "Seychelles",
            "Sierra Leone", "Singapore", "Slovakia", "Slovenia",
            "Solomon Islands", "Somalia", "South Africa",
            "South Georgia and the South Sandwich Islands", "South Korea",
            "Spain", "Sri Lanka", "Sudan", "Suriname",
            "Svalbard and Jan Mayen", "Swaziland", "Sweden", "Switzerland",
            "Syria", "Taiwan", "Tajikistan", "Tanzania", "Thailand",
            "The Bahamas", "The Gambia", "Togo", "Tokelau", "Tonga",
            "Trinidad and Tobago", "Tunisia", "Turkey", "Turkmenistan",
            "Turks and Caicos Islands", "Tuvalu", "Virgin Islands", "Uganda",
            "Ukraine", "United Arab Emirates", "United Kingdom",
            "United States", "United States Minor Outlying Islands", "Uruguay",
            "Uzbekistan", "Vanuatu", "Vatican City", "Venezuela", "Vietnam",
            "Wallis and Futuna", "Western Sahara", "Yemen", "Yugoslavia",
            "Zambia", "Zimbabwe" };

    public void onItemClick(AdapterView<?> adapterview, View arg1,
                            int position, long arg3) {
        // TODO Auto-generated method stub
        selectedname = (String) adapterview.getItemAtPosition(position);

    }
}

text.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:textColor="#000000"
    android:textStyle="italic"
    android:textSize="20dp">

</TextView>