activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ListView
android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
</ListView>
</LinearLayout>
MainActivity.java
package in.blogspot.kantapp.androidlistviewusingcustomadapterandsqlite;
import java.util.ArrayList;
import android.app.ActionBar.LayoutParams;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.inputmethod.InputMethodManager;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemLongClickListener;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
public class MainActivity extends Activity {
// Out custom adapter
MySimpleArrayAdapter adapter;
// contains our listview items
ArrayList<MyNotes> listItems;
// database
DatabaseHelper DatabaseHelper;
// list of todo titles
ArrayList<String> newData;
// contains the id of the item we are about to delete
public int deleteItem;
// EditText field for adding new items to the list
EditText editText2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// We're getting our listView by the id
ListView listView = (ListView) findViewById(R.id.list);
// Creating a new instance of our DatabaseHelper, which we've created
// earlier
DatabaseHelper = new DatabaseHelper(this);
// This returns a list of all our current available notes
listItems = DatabaseHelper.getAllNotes();
newData = new ArrayList<String>();
// Assigning the title to our global property so we can access it
// later after certain actions (deleting/adding)
for (MyNotes note : listItems) {
newData.add(note.Title);
}
// We're initialising our custom adapter with all our data from the
// database
adapter = new MySimpleArrayAdapter(this, newData);
// Assigning the adapter to ListView
listView.setAdapter(adapter);
// Assigning an event to the listview
// This event will be used to delete records
listView.setOnItemLongClickListener(myClickListener);
}
/**
* This adapter will create your list view row by row
*/
public class MySimpleArrayAdapter extends ArrayAdapter<String> {
private final Context context;
private final ArrayList<String> values;
public MySimpleArrayAdapter(Context context, ArrayList<String> values) {
super(context, R.layout.rowlayout, values);
this.context = context;
this.values = values;
}
/**
* Here we go and get our rowlayout.xml file and set the textview text.
* This happens for every row in your listview.
*/
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View rowView = inflater.inflate(R.layout.rowlayout, parent, false);
TextView textView = (TextView) rowView.findViewById(R.id.label);
// Setting the text to display
textView.setText(values.get(position));
return rowView;
}
}
/**
* On a long click delete the selected item
*/
public OnItemLongClickListener myClickListener = new OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
// Assigning the item position to our global variable
// So we can access it within our AlertDialog below
deleteItem = arg2;
// Creating a new alert dialog to confirm the delete
AlertDialog alert = new AlertDialog.Builder(arg1.getContext())
.setTitle("Delete " + listItems.get(deleteItem).Title)
.setPositiveButton("Ok",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int whichButton) {
// Retrieving the note from our listItems
// property, which contains all notes from
// our database
MyNotes note = listItems.get(deleteItem);
// Deleting it from the ArrayList<string>
// property which is linked to our adapter
newData.remove(deleteItem);
// Deleting the note from our database
DatabaseHelper.deleteNote(note.Id);
// Tell the adapter to update the list view
// with the latest changes
adapter.notifyDataSetChanged();
dialog.dismiss();
}
})
.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int whichButton) {
// When you press cancel, just close the
// dialog
dialog.cancel();
}
}).show();
return false;
}
};
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
/**
* This method is called when you press any button in your menu We've named
* our add button action_add in our menu.xml file
*/
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle presses on the action bar items
switch (item.getItemId()) {
case R.id.action_add:
showCreateNote();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
/**
* This simply shows a alert dialog asking for the todo text
*/
public void showCreateNote() {
// Creating a dynamical edittext for our alert dialog
editText2 = new EditText(this);
editText2.setId(9999);
editText2.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT));
editText2.setHint("Enter your note");
AlertDialog alert = new AlertDialog.Builder(this)
.setTitle("Create Note")
.setView(editText2)
.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
if (editText2.getText().toString().length() > 0) {
// Adding the new todo text to our database
long Id = DatabaseHelper.addRecord(editText2
.getText().toString());
// Create a new MyNotes object to add it to our
// global property listItems
MyNotes note = new MyNotes();
note.Id = (int) Id;
note.Title = editText2.getText().toString();
listItems.add(note);
newData.add(note.Title);
adapter.notifyDataSetChanged();
}
dialog.dismiss();
// This hides the android keyboard
InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
imm.toggleSoftInput(
InputMethodManager.HIDE_IMPLICIT_ONLY, 0);
}
})
.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int whichButton) {
dialog.cancel();
// This hides the android keyboard
InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
imm.toggleSoftInput(
InputMethodManager.HIDE_IMPLICIT_ONLY,
0);
}
}).show();
// We are automatically focusing on the editText field
if (editText2.requestFocus())
;
{
// This brings out the android keyboard as soon as we focus on the
// editText area
InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0);
}
}
}
DatabaseHelper.java
package in.blogspot.kantapp.androidlistviewusingcustomadapterandsqlite;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import java.util.ArrayList;
public class DatabaseHelper extends SQLiteOpenHelper {
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "MyNotes";
private static final String DATABASE_TABLE_NAME = "todo";
public static final String COLID = "MyNotesID";
public static final String COLTITLE = "Title";
DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
/**
* This runs once after the installation and creates a database
*/
@Override
public void onCreate(SQLiteDatabase db) {
// Here we are creating two columns in our database.
// MyNotesID, which is the primary key and Title which will hold the
// todo text
db.execSQL("CREATE TABLE " + DATABASE_TABLE_NAME + " (" + COLID
+ " INTEGER PRIMARY KEY AUTOINCREMENT, " + COLTITLE + " TEXT)");
}
/**
* This would run after the user updates the app. This is in case you want
* to modify the database
*/
@Override
public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {
// TODO Auto-generated method stub
}
/**
* This method adds a record to the database. All we pass in is the todo
* text
*/
public long addRecord(String title) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues cv = new ContentValues();
cv.put(COLTITLE, title);
return db.insert(DATABASE_TABLE_NAME, null, cv);
}
/**
* //This method returns all notes from the database
*/
public ArrayList<MyNotes> getAllNotes() {
SQLiteDatabase db = this.getReadableDatabase();
ArrayList<MyNotes> listItems = new ArrayList<MyNotes>();
Cursor cursor = db.rawQuery("SELECT * from " + DATABASE_TABLE_NAME,
new String[] {});
if (cursor.moveToFirst()) {
do {
MyNotes note = new MyNotes();
note.Id = cursor.getInt(cursor.getColumnIndex(COLID));
note.Title = cursor.getString(cursor.getColumnIndex(COLTITLE));
listItems.add(note);
} while (cursor.moveToNext());
}
cursor.close();
return listItems;
}
/*
* //This method deletes a record from the database.
*/
public void deleteNote(long id) {
SQLiteDatabase db = this.getReadableDatabase();
String string = String.valueOf(id);
db.execSQL("DELETE FROM " + DATABASE_TABLE_NAME + " WHERE " + COLID
+ "=" + id + "");
}
}
MyNotes.java
package in.blogspot.kantapp.androidlistviewusingcustomadapterandsqlite;
public class MyNotes {
public int Id;
public String Title;
}
manu/main.xml
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
tools:context="com.ahotbrew.listviewsqlite.MainActivity" >
<item android:id="@+id/action_add"
android:showAsAction="always"
android:title="Add"/>
</menu>
rowlayout.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="35dp"
android:layout_weight="1"
android:paddingLeft="5dp"
android:paddingRight="5dp"
android:paddingTop="5dp" >
<TextView
android:id="@+id/label"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:textSize="22sp" />
</LinearLayout>
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