ContentProvider和app间传递数据

创建应用ContentWriter和CotentReader

在应用ContentWriter创建MyProvider继承ContentProvider

public class MyProviderextends ContentProvider {

publicstatic final Uri URI = Uri.parse("content://com.example.contentwriter");

privatestatic final StringTABLE = "t_person";

private SQLiteDatabasedatabase;

@Override

public boolean onCreate() {

// TODO Auto-generated method stub

database = getContext().openOrCreateDatabase("db_person.db", Context.MODE_PRIVATE,null);

String sql = "create table if not exists t_person(" +

"_id integer primary key autoincrement," +

"name text," +

"sex text" +

")";

database.execSQL(sql);

returntrue;

}

@SuppressLint("ShowToast")@Override

public Cursor query(Uri uri, String[] projection, String selection,

String[] selectionArgs, String sortOrder) {

// TODO Auto-generated method stub

Cursor cursor = database.query(TABLE, null, selection, selectionArgs, null, null, sortOrder);

return cursor;

}

@Override

public String getType(Uri uri) {

// TODO Auto-generated method stub

returnnull;

}

@Override

public Uri insert(Uri uri, ContentValues values) {

// TODO Auto-generated method stub

database.insert(TABLE,null, values);

returnnull;

}

@Override

public int delete(Uri uri, String selection, String[] selectionArgs) {

// TODO Auto-generated method stub

int num =database.delete(TABLE, selection, selectionArgs);

return num;

}

@Override

public int update(Uri uri, ContentValues values, String selection,

String[] selectionArgs) {

// TODO Auto-generated method stub

int num =database.update(TABLE, values, selection, selectionArgs);

return num;

}

}

ContentWriter配置AndroidMainfest.xml，添加Provider，设置Provider属性Name为上面创建的类的名字MyProvider，Authorities为com.example.contentwriter，Exported为true

ContentWriter的MainActicity类的实现

public class MainActivityextends ActionBarActivity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        

        findViewById(R.id.button_insert).setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

ContentValues contentValues = new ContentValues();

contentValues.put("name","zmx");

contentValues.put("sex","女");

getContentResolver().insert(MyProvider.URI, contentValues);

}

});

        

        findViewById(R.id.button_update).setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

ContentValues contentValues = new ContentValues();

contentValues.put("name","lhl");

getContentResolver().update(MyProvider.URI, contentValues,"name=?", new String[] {"zmx"});

}

});

        

        findViewById(R.id.button_delete).setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

getContentResolver().delete(MyProvider.URI,"name=?", new String[] {"lhl"});

}

});

    }

}

ContentReader的MainActivity类的实现

public class MainActivityextends ActionBarActivity {

privatestatic final Uri URI = Uri.parse("content://com.example.contentwriter");

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        

        Cursor cursor = getContentResolver().query(URI,null, "sex=?",new String[] {"女"},null);

        cursor.moveToFirst();

        for (int i = 0; i < cursor.getCount(); i++) {

String name = cursor.getString(cursor.getColumnIndex("name"));

String sex = cursor.getString(cursor.getColumnIndex("sex"));

Toast.makeText(getApplicationContext(), name + sex, Toast.LENGTH_SHORT).show();

cursor.moveToNext();

}

    }

}