topic Re: Android 6 - rotate display before start bootanim in i.MX Processors

Android 6 - rotate display before start bootanim

andrzejdziedzic — Wed, 20 Feb 2019 07:56:44 GMT

Hi,

I have a device with i.MX6 and Android 6, it uses the accelerometer to rotate display.

The problem is when device starts in the upside down orientation:

- bootanim is shown,

- Launcher app starts, inside onCreate() the app sets a reverse orientation (this is not visible as bootanim is still visible),

- bootanim is closed - after that Launcher app is shown, but for a short time is visible in a normal orientation until Android rotates the screen.

Is there any way to rotate Android display at the beginning, before start bootanim?

Re: Android 6 - rotate display before start bootanim

jimmychan — Wed, 20 Feb 2019 08:21:53 GMT

this may help you : How to change boot logo animation orientation?

Re: Android 6 - rotate display before start bootanim

andrzejdziedzic — Mon, 29 Apr 2019 06:39:08 GMT

Hi jimmychan

I know how to change the boot logo animation, or just modify the bootanim source to display existing animation upside down.

The problem is different, please see my scenario:

1. System starts in the normal, the bootanim is shown on screen.

2. Launcher starts and set the reverse orientation - but this is not visible, Android doesn't change orientation because the bootanim is shown.

3. The bootanim is hidden, as a result Android shows the Launcher and changes orientation to requested one - but this happens with some delay. So in fact:

- for about 100ms the Launcher is shown with initial orientation,

- then screen rotates to the correct orientation.

Do you have any idea how to avoid this.

As I know during orientation changes Android freezes screen updates until a window is painted. Maybe is it possible to extend the freeze time?