基础之活动回收

a中有临时数据，跳b返回，数据还在

public void onSaveInstanceState(Bundle outState, PersistableBundle outPersistentState) {    super.onSaveInstanceState(outState, outPersistentState);    String s = editText.getText().toString();    outState.putString("data_a",s);}

onCreate中

if(savedInstanceState!=null) {    String data_a = savedInstanceState.getString("data_a");    editText.setText(data_a);    Toast.makeText(this,data_a,Toast.LENGTH_SHORT).show();}