[Android新手学习笔记08]-如何让活动Activity保存临时数据用于恢复

1.重写onSaveInstanceState()方法

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    String tempData = "Something you just typed";
    outState.putString("data_key", tempData);
}

2.在onCreate()方法中处理

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_first);
    if (savedInstanceState != null) {
        String tempData = savedInstanceState.getString("data_key");
        Log.d("tag", tempData);
    }
}