Android Studio - Activity's layout shows flipped (RTL instead of LTR)

Question

I have this issue in my App, which is super weird.

I have an app, when i press Run on Android Studio, it starts the app with the correct layout's direction. Now, i press Back button and go back to the app, it shows a RTL layout instead of the current, correct LTR layout.

The app is pretty simple, it has an Activity with a NavigationButton in the Toolbar, when its flipped, the NavigationButton goes from left to the right, with a false pointing direction.

The app is LTR, supports only English, and tested on an English device, the same result is happening on the Emulator. I have the final version of Android Studio.

• Layout, with Toolbar, along with navigation attribute, to enable back arrow.
• Activity which setContentView and just shows the layout.
• Back pressing, or re-opening the App without clearing it from the BackStack, shows the visual bug.

What cause the issue? as the code is pretty simple and doesn't have anything hardcore.

Manifest Code:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.corF.app">
<uses-permission android:name="android.permission.INTERNET"/>
<application
    android:supportsRtl="true"
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:theme="@style/AppTheme">
    <activity
        android:name="com.corF.app.activities.ActivityStartup"
        android:label="@string/app_name"
        android:windowSoftInputMode="adjustResize|stateHidden">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>
</manifest>

Answer 1

A library which i use (SliderLayout), has a code which forces the app to show RTL. On the first launch the SliderLayout forces the RTL, but it doesn't take change until i re-open the app without fully removing it from the backstack.

Silly issue, but yeah, this's the solution.