Saving the state of an activity before pressing the back button

2018-06-11 02:31:56

I am currently building an android app which requires saving the state of my variables and views when the back button is pressed. I know the onSaveInstanceState() would work for scenarios which involve change in orientation but how do I get it to save when I use the back button.

You may override finish() method and do saving there. This method is called when the activity is finished — that means, it's removed from activity stack. By default this happens when you press back button.

You can override,

@Override
public void onBackPressed() {
super.onBackPressed();
}

and save the state in Shared Preferences.

正如Sarge所说的，你可以重写onFinish（）并将数据保存在首选项，AppDelegate等中。或者你可以保存数据并将它发送到activityResult的上一个活动，或者你可以尝试找到适当的活动标记，活动不会被杀死。

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