ActionBar changes colour after changing phone orientation and closing Contextual Action Bar

问题

Problem

First my ActionBar (with custom menu) is purple, then:

1. Trigger CAB by long-click on my ListView
2. Change phone orientation
3. Cancel CAB

ActionBar becomes white. This does not happen without phone orientation change. I have tried this on android 4.4.4, minSdkVersion="19", targetSdkVersion="26". Can you please advise me, why this could happen?

UPDATE: Tried on API 25 emulator, and this does not happen.

---

Sources

Activity layout:

<android.support.constraint.ConstraintLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="sk.tuke.smart.makac.activities.FreeShootingHistoryActivity">

    <ListView
        android:id="@+id/listview_freeshootinghistory"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginBottom="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:listitem="@android:layout/simple_list_item_activated_2" />
</android.support.constraint.ConstraintLayout>

switch_menu.xml - classic Action Bar:

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@+id/item_switchmenu_label"
        android:title="@string/switchmenu_colouring"
        app:showAsAction="ifRoom" />
    <item
        android:id="@+id/item_switchmenu_switch"
        android:title="@string/switchmenu_colouring"
        app:actionViewClass="android.support.v7.widget.SwitchCompat"
        app:showAsAction="always" />
</menu>

delete_menu.xml - Contextual Action Bar:

<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/item_deletemenu_delete"
        android:icon="@drawable/ic_action_delete"
        android:title="@string/deletemenu_delete" />
</menu>

initializing ActionBar in activity:

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.switch_menu, menu);
    //...stuff...

    return true;
}

setting up CAB in onCreate():

historyListView.setChoiceMode(AbsListView.CHOICE_MODE_MULTIPLE_MODAL);
historyListView.setMultiChoiceModeListener(choiceModeListener);

inside MultiChoiceModeListener:

@Override
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
    // Inflate the menu for the CAB
    MenuInflater inflater = mode.getMenuInflater();
    inflater.inflate(R.menu.delete_menu, menu);

    //...stuff...

    return true;
}

in <application> inside Manifest this style is set android:theme="@style/AppTheme" from styles.xml:

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">#8600b3</item>
        <item name="colorPrimaryDark">#730099</item>
        <item name="colorAccent">@color/colorPrimaryDark</item>
        <item name="android:colorBackground">#bfc6f6</item>
        <item name="android:textColorSecondary">@color/text_color_secondary</item>
    </style>

</resources>

回答1:

The same issue exists on Lollipop with a slightly different result. In my case the support ActionBar just gets darker with little 'shadows' on both sides.

The following hack works on all API versions:

@Override
public void onDestroyActionMode(ActionMode mode) {
    // Find the ActionBar view
    final View view = findActionBarView(
            mActivity.getWindow().getDecorView());

    if (view != null) {
        view.post(new Runnable() {
            @Override
            public void run() {
                // Start view animation
                view.animate().alpha(0f).setDuration(100);
            }
        });
    }
}

public static ViewGroup findActionBarView(View view) {
    try {
        if (view instanceof ViewGroup) {
            ViewGroup viewGroup = (ViewGroup) view;

            // You can search for the Toolbar if necessary
            if (viewGroup instanceof android.support.v7.widget.ActionBarContainer) {
                for (int i = 0; i < viewGroup.getChildCount(); i++) {
                    View actionView = viewGroup.getChildAt(i);

                    // Return currently visible context bar
                    if (actionView.getVisibility() == View.VISIBLE) {
                        return (ViewGroup) actionView;
                    }
                }
            }

            for (int i = 0; i < viewGroup.getChildCount(); i++) {
                ViewGroup actionView =
                        getActionBarView(viewGroup.getChildAt(i));

                if (actionView != null) {
                    return actionView;
                }
            }
        }
    } catch (Exception e) {
        Log.e(TAG, "View not found", e);
    }

    return null;
}

P.S. Basically, you just have to perform any simple animation on the ActionBar view. If you find the root of the problem in the source code, or maybe more elegant way to fix it, please let me know.

来源：https://stackoverflow.com/questions/48688177/actionbar-changes-colour-after-changing-phone-orientation-and-closing-contextual