实例_活动被系统意外回收时_保留临时数据onSaveInstanceState(Bundle outState)

public class MainActivity extends Activity
{
private EditText et;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//
//小技巧:
//MainActivity.this.getClass().getName().toString()----------<package name>.<instance name>
//MainActivity.this.getClass().getSimpleName().toString()----<instance name>
//
Log.e(MainActivity.this.getClass().getSimpleName().toString(), "开始了");
et = (EditText) findViewById(R.id.et);
if(savedInstanceState != null)
{
String tempData = savedInstanceState.getString("key");//temp 临时的
et.setText(tempData);
et.setSelection(tempData.length());
}
}

@Override
protected void onSaveInstanceState(Bundle outState)//state 国家 规定 情形 n/v
{
super.onSaveInstanceState(outState);
String tempData = et.getText().toString();
outState.putString("key", tempData);
}
}