public class MainActivity extends ActionBarActivity { 
  private final static String TAG = "MainActivity"; 
  @Override 
  // Activity被创建时调用 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    Log.e(TAG, "onCreate......."); 
  } 
  @Override 
  // 该状态用户可见，但是用户还不能与之进行交互 
  protected void onStart() { 
    super.onStart(); 
    Log.e(TAG, "onStart......."); 
  } 
  @Override 
  // 该状态是Activity获得用户焦点，用户可以与之进行交互 
  protected void onResume() { 
    super.onResume(); 
    Log.e(TAG, "onResume......."); 
  } 
  @Override 
  //与onResume对应，当Activity失去焦点时调用 
  protected void onPause() { 
    super.onPause(); 
    Log.e(TAG, "onPause......."); 
  } 
  @Override 
  //与onStart对应，当Activity不可见时调用 
  protected void onStop() { 
    super.onStop(); 
    Log.e(TAG, "onStop......."); 
  } 
  @Override 
  //与onCreate对应，当Activity被销毁时调用 
  protected void onDestroy() { 
    super.onDestroy(); 
    Log.e(TAG, "onDestroy......."); 
  } 
  @Override 
  //Activity从后台重新回到前台调用 
  protected void onRestart() { 
    super.onRestart(); 
    Log.e(TAG, "onRestart......."); 
  } 
}