Activity Life Cycle (4) data is saved before the activity ends, and the activity ends

Activity Life Cycle (4) data is saved before the activity ends, and the activity ends

When the next activity is running, the previous activity will be destroyed. When we return to the previous activity, the system will restart the create activity. What should we do if the problem arises? OnSaveInstanceState can be saved using this method. Key-value pairs [ke, "value"] are actually saved like Intent. Let's take an example and try it. First, let's get the code:

@ Override protected void onSaveInstanceState (Bundle outState) {super. onSaveInstanceState (outState); String tempadata = "this is the stored data"; outState. putString ("data_key", tempadata );}

Write the following code in onCreate:

If (savedInstanceState! = Null) {String tempdata = savedInstanceState. getString ("data_key"); Log. d (TAG, tempdata );}