实例_活动被系统意外回收时_保留临时数据

 1 public class MainActivity extends Activity
 2 {
 3     private EditText et;
 4     @Override
 5     protected void onCreate(Bundle savedInstanceState)
 6     {
 7         super.onCreate(savedInstanceState);
 8         setContentView(R.layout.activity_main);
 9         //
10         //小技巧:
11         //MainActivity.this.getClass().getName().toString()----------<package name>.<instance name>
12         //MainActivity.this.getClass().getSimpleName().toString()----<instance name>
13         //
14         Log.e(MainActivity.this.getClass().getSimpleName().toString(), "开始了");
15         et = (EditText) findViewById(R.id.et);
16         if(savedInstanceState != null)
17         {    
18             String tempData = savedInstanceState.getString("key");//temp 临时的
19             et.setText(tempData);
20             et.setSelection(tempData.length());
21         }
22     }
23     
24     @Override
25     protected void onSaveInstanceState(Bundle outState)//state 国家 规定 情形 n/v
26     {
27         super.onSaveInstanceState(outState);
28         String tempData = et.getText().toString();
29         outState.putString("key", tempData);
30     }
31 }