Android Example-To Do List Application

acitvity_main.xml

<LinearLayout 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:orientation="vertical"
    tools:context=".MainActivity" >

    <EditText
        android:id="@+id/edittext"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

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

</LinearLayout>

MainActivity.java

package in.kantapp.example28;

import java.util.ArrayList;

import android.R.string;
import android.os.Bundle;
import android.app.Activity;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;

public class MainActivity extends Activity
{

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

        ListView lv = (ListView) findViewById(R.id.ListView);
        final EditText text = (EditText) findViewById(R.id.edittext);

        final ArrayList<String> do_list = new ArrayList<String>();
        final ArrayAdapter<String> adapter;

        adapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, do_list);

        lv.setAdapter(adapter);

        text.setOnKeyListener(new View.OnKeyListener()
        {

            @Override
            public boolean onKey(View v, int keyCode, KeyEvent event)
            {
                // TODO Auto-generated method stub
                if (event.getAction() == KeyEvent.ACTION_DOWN)
                {
                    if ((keyCode == KeyEvent.KEYCODE_DPAD_CENTER)
                            || (keyCode == KeyEvent.KEYCODE_ENTER))
                    {
                        do_list.add(0, text.getText().toString());
                        adapter.notifyDataSetChanged();
                        text.setText("");
                        return true;
                    }
                }
                return false;
            }
        });
    }



}

Dolistitemview.java

package in.kantapp.example28;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.widget.TextView;

public class Dolistitemview extends TextView {

    private Paint marginPaint;
    private Paint linePaint;
    private int paperColor;
    private float margin;

    public Dolistitemview(Context context, AttributeSet attrs, int defStyle)
    {
        super(context, attrs, defStyle);
        // TODO Auto-generated constructor stub
        init();
    }

    private void init() {

        Resources myResources = getResources();

        marginPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        marginPaint.setColor(myResources.getColor(R.color.notepad_margin));
        linePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        linePaint.setColor(myResources.getColor(R.color.notepad_lines));
        paperColor = myResources.getColor(R.color.notepad_paper);
        margin = myResources.getDimension(R.dimen.notepad_margin);
    }

    @Override
    public void onDraw(Canvas canvas) {
        // Use the base TextView to render the text.
        canvas.drawColor(paperColor);

        //drawing lines
        canvas.drawLine(0, 0, 0, getMeasuredHeight(), linePaint);
        canvas.drawLine(0, getMeasuredHeight(), getMeasuredWidth(),
                getMeasuredHeight(), linePaint);
        //the margin line
        canvas.drawLine(margin, 0, margin, getMeasuredHeight(), marginPaint);

        canvas.save();
        canvas.translate(margin, 0);
        super.onDraw(canvas);
        canvas.restore();
    }
}

dimens.xml

<resources>
    <!-- Default screen margins, per the Android Design guidelines. -->
    <dimen name="activity_horizontal_margin">16dp</dimen>
    <dimen name="activity_vertical_margin">16dp</dimen>
    <dimen name="notepad_margin">16dp</dimen>
</resources>

color.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorPrimary">#3F51B5</color>
    <color name="colorPrimaryDark">#303F9F</color>
    <color name="colorAccent">#FF4081</color>
    <color name="notepad_margin">#f96b3c</color>
    <color name="notepad_lines">#000000</color>
    <color name="notepad_paper">#ffffff</color>
</resources>

dolistitem.xml

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

<in.kantapp.example28.Dolistitemview xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fadingEdge="vertical"
    android:padding="10dp"
    android:scrollbars="vertical"
    android:textColor="@color/notepad_lines" />

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="in.kantapp.example28">

    <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>