Mark's coding playground...

If we want to open the inbuilt calculator of ANDROID ,here is the sniffet... public class CalculatorActivity extends Activity { public static final String CALCULATOR_PACKAGE ="com.android.calculator2"; public static final String CALCULATOR_CLASS ="com.android.calculator2.Calculator"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Intent calculatorintent = new Intent(); calculatorintent.setAction(Intent.ACTION_MAIN); calculatorintent.addCategory(Intent.CATEGORY_LAUNCHER); calculatorintent.setComponent(new ComponentName(CALCULATOR_PACKAGE,CALCULATOR_CLASS)); CalculatorActivity.this.startActivity(calculatorintent); } } The above may not work with every devices, so you may need this one.. ArrayList<HashMap<String,Object>> items =new ArrayList<HashMap<String...