Don't close application when Back button is pressed

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public class TestActivity extends Activity {
  //...
  // Working for all API levels
  @Override
  public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
      moveTaskToBack(true);
    }
    return super.onKeyDown(keyCode, event);
  }
	
  // Alternative variant for API 5 and higher
  @Override
  public void onBackPressed() {
    moveTaskToBack(true);
  }
}