IssueTracker

Component used: androidx.appcompat:appcompat

Version used: 1.1.0 & 1.6.0

Devices/Android versions reproduced on: Vivo Z1 Pro (1918) / Android 11

We have recently performed a series of performance optimizations on one of our activities, which involved offloading non-UI operations to worker threads and utilizing Handler#post from these threads to post View-related operations on the Main thread.

After these optimizations, we noticed that the initialization process of the Toolbar reaches a certain point in the code, but the mMenuInvalidator does not execute as expected:

// ToolbarActionBar.java

@Override
public boolean invalidateOptionsMenu() {
    mDecorToolbar.getViewGroup().removeCallbacks(mMenuInvalidator);
    ViewCompat.postOnAnimation(mDecorToolbar.getViewGroup(), mMenuInvalidator); // <-- Issue here
    return true;
}

Consequently, the mMenuPrepared flag remains false. This causes a problem when the Back button is clicked, as there is a check within the listener that prevents any effect from occurring:

// ToolbarWidgetWrapper.java

mToolbar.setNavigationOnClickListener(new View.OnClickListener() {
    final ActionMenuItem mNavItem = new ActionMenuItem(mToolbar.getContext(),
            0, android.R.id.home, 0, 0, mTitle);
    @Override
    public void onClick(View v) {
        if (mWindowCallback != null && mMenuPrepared) {
            mWindowCallback.onMenuItemSelected(Window.FEATURE_OPTIONS_PANEL, mNavItem);
        }
    }
});

As a temporary workaround, we have overridden the listener using setNavigationOnClickListener(), which seems to address the issue. However, we are still interested in understanding the root cause and finding a proper solution within our application code.

Any assistance or guidance you can provide to resolve this issue would be greatly appreciated.