flutter - How can I force Android 10 tablet to start directly in Landscape mode, avoiding portrait startup before loading my app

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I am developing a custom launcher app for an Android 10 tablet, and I want the tablet to always boot in Landscape mode. Currently, my launcher forces the app to load in landscape mode, which works fine once the app starts. However, there is a problem: the tablet first boots in portrait mode for about 5-10 seconds before my app takes over and switches it to landscape mode.

My goal: I want to ensure that the tablet starts directly in landscape mode—without showing the portrait screen for even a brief moment.

I've already implemented landscape orientation in my launcher app, but the initial boot screen still appears in portrait mode before the app takes over. How can I configure the tablet to skip this portrait mode and start in landscape from the moment it is powered on, even before the app loads?

Things I've tried:

Setting the app's orientation to landscape in the AndroidManifest.xml (android:screenOrientation="landscape") Using setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE) within the main activity of the launcher. However, this only affects the app once it starts, and the tablet still boots into portrait mode initially.

Any advice or solutions would be greatly appreciated!

I am developing a custom launcher app for an Android 10 tablet, and I want the tablet to always boot in Landscape mode. Currently, my launcher forces the app to load in landscape mode, which works fine once the app starts. However, there is a problem: the tablet first boots in portrait mode for about 5-10 seconds before my app takes over and switches it to landscape mode.

My goal: I want to ensure that the tablet starts directly in landscape mode—without showing the portrait screen for even a brief moment.

I've already implemented landscape orientation in my launcher app, but the initial boot screen still appears in portrait mode before the app takes over. How can I configure the tablet to skip this portrait mode and start in landscape from the moment it is powered on, even before the app loads?

Things I've tried:

Setting the app's orientation to landscape in the AndroidManifest.xml (android:screenOrientation="landscape") Using setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE) within the main activity of the launcher. However, this only affects the app once it starts, and the tablet still boots into portrait mode initially.

Any advice or solutions would be greatly appreciated!

• android
• flutter
• android-firmware

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1 Answer 1

Sorted by: Reset to default 1

The issue your facing is because of the bootloader and system UI control the screen orientation before your launcher starts. Most Android devices default to portrait mode during boot. Since your app only takes control after boot completion, the pre-launch phase still uses the default portrait mode.

Solution 1 (Requires Rooted Device) :
Modify the build.prop File

The build.prop file contains system properties that affect device behavior.

Access build.prop (Requires root or system-level access):

adb root adb remount adb shell 

Edit build.prop using a text editor:

nano /system/build.prop 

Add the following line to force landscape mode at boot:

ro.sf.hwrotation=90 

• Use 90 or 270 for landscape mode (depending on your device).

• If the line already exists, change its value.

• ro.sf.hwrotation=90 directly affects the system framebuffer (display rotation) at the lowest level.

Save and reboot the device:

adb reboot 

Solution 2 (If root is not possible) :

If you cannot modify system files, consider this solution:

• Create a black screen splash activity in landscape mode that immediately covers the default boot UI.

• Delay launcher initialization for a few seconds so the black screen hides the transition.

Example :

<activity
    android:name=".SplashActivity"
    android:screenOrientation="landscape"
    android:theme="@style/Theme.BlackScreen"
    android:launchMode="singleTask">
    <intent-filter>
        <action android:name="android.intent.action.MAIN"/>
        <category android:name="android.intent.category.LAUNCHER"/>
    </intent-filter>
</activity>

This doesn’t truly solve the problem but hides the transition.

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