Android 横竖屏切换时保存Activity状态

// 保存@Overridepublic void onSaveInstanceState(Bundle savedInstanceState) {  super.onSaveInstanceState(savedInstanceState);  // Save UI state changes to the savedInstanceState.  // This bundle will be passed to onCreate if the process is  // killed and restarted.  savedInstanceState.putBoolean("MyBoolean", true);  savedInstanceState.putDouble("myDouble", 1.9);  savedInstanceState.putInt("MyInt", 1);  savedInstanceState.putString("MyString", "Welcome back to Android");  // etc.}

// 恢复@Overridepublic void onRestoreInstanceState(Bundle savedInstanceState) {  super.onRestoreInstanceState(savedInstanceState);  // Restore UI state from the savedInstanceState.  // This bundle has also been passed to onCreate.  boolean myBoolean = savedInstanceState.getBoolean("MyBoolean");  double myDouble = savedInstanceState.getDouble("myDouble");  int myInt = savedInstanceState.getInt("MyInt");  String myString = savedInstanceState.getString("MyString");}

CAREFUL: you need to call super.onSaveInstanceState(savedInstanceState) before adding your values to the Bundle, or they will get wiped out on that call (Droid X Android 2.2).先调用super.onSaveInstanceState(savedInstanceState)方法，然后再添加值

*** 重要的信息还是要在onPause()中就保存到SharedPreferece或SQlite中，因为onSaveInstanceState不是声明周期中的方法，不能保证每次都能调用

developer.android.com/reference/android/app/Activity.html 

http://stackoverflow.com/questions/151777/saving-activity-state-in-android