Cursor adapter and sqlite example [closed]

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开发者_运维技巧

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Hello I am looking for sample code in which cursor adapter is used with sqlite?

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Really simple example.

Here is a really simple, but very effective, example. Once you have the basics down you can easily build off of it.

There are two main parts to using a Cursor Adapter with SQLite:

1. Create a proper Cursor from the Database.

2. Create a custom Cursor Adapter that takes the Cursor data from the database and pairs it with the View you intend to represent the data with.

1. Create a proper Cursor from the Database.

In your Activity:

SQLiteOpenHelper sqLiteOpenHelper = new SQLiteOpenHelper( 
        context, DATABASE_NAME, null, DATABASE_VERSION);

SQLiteDatabase sqLiteDatabase = sqLiteOpenHelper.getReadableDatabase();

String query = "SELECT * FROM clients ORDER BY company_name ASC"; // No trailing ';'

Cursor cursor = sqLiteDatabase.rawQuery(query, null); 

ClientCursorAdapter adapter = new ClientCursorAdapter(
        this, R.layout.clients_listview_row, cursor, 0 );

this.setListAdapter(adapter);

2. Create a Custom Cursor Adapter.

Note: Extending from ResourceCursorAdapter assumes you use XML to create your views.

public class ClientCursorAdapter extends ResourceCursorAdapter {

    public ClientCursorAdapter(Context context, int layout, Cursor cursor, int flags) {
        super(context, layout, cursor, flags);
    }

    @Override
    public void bindView(View view, Context context, Cursor cursor) {
        TextView name = (TextView) view.findViewById(R.id.name);
        name.setText(cursor.getString(cursor.getColumnIndex("name")));

        TextView phone = (TextView) view.findViewById(R.id.phone);
        phone.setText(cursor.getString(cursor.getColumnIndex("phone")));
    }
}

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In Android, How to use a Cursor with a raw query in sqlite:

Cursor c = sampleDB.rawQuery("SELECT FirstName, Age FROM mytable " +
           "where Age > 10 LIMIT 5", null);

if (c != null ) {
    if  (c.moveToFirst()) {
        do {
            String firstName = c.getString(c.getColumnIndex("FirstName"));
            int age = c.getInt(c.getColumnIndex("Age"));
            results.add("" + firstName + ",Age: " + age);
        }while (c.moveToNext());
    }
}
c.close();

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CursorAdapter Example with Sqlite

...
DatabaseHelper helper = new DatabaseHelper(this);
aListView = (ListView) findViewById(R.id.aListView);
Cursor c = helper.getAllContacts();
CustomAdapter adapter = new CustomAdapter(this, c);
aListView.setAdapter(adapter);
...

class CustomAdapter extends CursorAdapter {
    // CursorAdapter will handle all the moveToFirst(), getCount() logic for you :)

    public CustomAdapter(Context context, Cursor c) {
        super(context, c);
    }

    public void bindView(View view, Context context, Cursor cursor) {
        String id = cursor.getString(0);
        String name = cursor.getString(1);
        // Get all the values
        // Use it however you need to
        TextView textView = (TextView) view;
        textView.setText(name);
    }

    public View newView(Context context, Cursor cursor, ViewGroup parent) {
        // Inflate your view here.
        TextView view = new TextView(context);
        return view;
    }
}

private final class DatabaseHelper extends SQLiteOpenHelper {

    private static final String DATABASE_NAME = "db_name";
    private static final int DATABASE_VERSION = 1;
    private static final String CREATE_TABLE_TIMELINE = "CREATE TABLE IF NOT EXISTS table_name (_id INTEGER PRIMARY KEY AUTOINCREMENT, name varchar);";

    public DatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(CREATE_TABLE_TIMELINE);
        db.execSQL("INSERT INTO ddd (name) VALUES ('One')");
        db.execSQL("INSERT INTO ddd (name) VALUES ('Two')");
        db.execSQL("INSERT INTO ddd (name) VALUES ('Three')");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    }

    public Cursor getAllContacts() {
        String selectQuery = "SELECT  * FROM table_name;
        SQLiteDatabase db = this.getReadableDatabase();
        Cursor cursor = db.rawQuery(selectQuery, null);
        return cursor;
    }
}