Android应用程序设计用于在恢复时在横向显示的纵向模式

Question

I have designed an Android app to be displayed in portrait mode only (android:screenOrientation="sensorPortrait"). It works fine except in one case:

1. hold the tablet in portrait mode and start the app
2. enter some data
3. switch off the tablet
4. rotate the tablet to landscape mode
5. switch on the tablet

==> the first "frame" of my app is displayed in landscape mode and then it is rotated to portrait mode, which means onDestroy() is called and so my entered data is lost.

The tablet is a tab S2 8", with Android 7.0

Why is my app first displayed in landscape mode? Is there a way to avoid this behavior (I would like t avoid managing onSaveInstanceState()/onRestoreInstanceState() just because of this case)?

Answer 1

解决方案是实现ViewModel。