onRetainNonConfigurationInstance

一、onSaveInstanceState 1. 代码示例： 当屏幕的方向发生了改变， Activity会被摧毁并且被重新创建，如果你想在Activity被摧毁前缓存一些数据，并且在Activity被重新创建后恢复缓存的数据。可以重写Activity的 onSaveInstanceState() 和 onRestoreInstanceState()方法，如下代码所示： public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if(savedInstanceState != null){ boolean myBoolean = savedInstanceState.getBoolean("MyBoolean"); double myDouble = savedInstanceState.getDouble("myDouble"); String myString = savedInstanceState.getString("myString"); Log.i(