appcompat v21 throws java.lang.UnsupportedOperationException

Question

After updating my project to use the appcompat library to version 21.0.0 I have a problem with a context menu created with a gridview multichoice modal event. The same code works nice with appcompat v20.

This is the relevant part of the main activity:

public class MainActivity extends android.support.v7.app.ActionBarActivity 
    implements AbsListView.MultiChoiceModeListener {

    ...
    mGridView.setChoiceMode(AbsListView.CHOICE_MODE_MULTIPLE_MODAL);
    mGridView.setMultiChoiceModeListener(this);

    @Override
    public boolean onCreateActionMode(final ActionMode mode, final Menu menu) {
        mode.setTitle("Started");
        mode.getMenuInflater().inflate(R.menu.context_menu, menu);
        return true;
    }
}

and this is the context_menu.xml:

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/menu_item_share"
        android:title="Share..."
        app:showAsAction="ifRoom"
        android:icon="@android:drawable/ic_menu_share"
        app:actionProviderClass="android.support.v7.widget.ShareActionProvider" />
</menu>

And this is the stacktrace I'm getting back:

java.lang.UnsupportedOperationException: This is not supported, use MenuItemCompat.setActionProvider()
        at android.support.v7.internal.view.menu.MenuItemImpl.setActionProvider(MenuItemImpl.java:628)
        at android.support.v7.internal.view.menu.MenuItemWrapperICS.setSupportActionProvider(MenuItemWrapperICS.java:315)
        at android.support.v4.view.MenuItemCompat.setActionProvider(MenuItemCompat.java:345)
        at android.support.v7.internal.view.SupportMenuInflater$MenuState.setItem(SupportMenuInflater.java:473)
        at android.support.v7.internal.view.SupportMenuInflater$MenuState.addSubMenuItem(SupportMenuInflater.java:485)
        at android.support.v7.internal.view.SupportMenuInflater.parseMenu(SupportMenuInflater.java:194)
        at android.support.v7.internal.view.SupportMenuInflater.inflate(SupportMenuInflater.java:118)
        at creativesdk.adobe.com.myapplication.MainActivity.onCreateActionMode(MainActivity.java:71)
        at android.widget.AbsListView$MultiChoiceModeWrapper.onCreateActionMode(AbsListView.java:6165)
        at android.support.v7.internal.view.SupportActionModeWrapper$CallbackWrapper.onCreateActionMode(SupportActionModeWrapper.java:151)
        at android.support.v7.app.ActionBarActivityDelegateBase$ActionModeCallbackWrapper.onCreateActionMode(ActionBarActivityDelegateBase.java:1367)
        at android.support.v7.internal.app.WindowDecorActionBar$ActionModeImpl.dispatchOnCreate(WindowDecorActionBar.java:1012)
        at android.support.v7.internal.app.WindowDecorActionBar.startActionMode(WindowDecorActionBar.java:510)
        at android.support.v7.app.ActionBarActivityDelegateBase.startSupportActionMode(ActionBarActivityDelegateBase.java:576)
        at android.support.v7.app.ActionBarActivityDelegateHC.startActionModeForChild(ActionBarActivityDelegateHC.java:62)
        at android.support.v7.internal.widget.NativeActionModeAwareLayout.startActionModeForChild(NativeActionModeAwareLayout.java:44)
        at android.view.ViewGroup.startActionModeForChild(ViewGroup.java:694)
        at android.view.View.startActionMode(View.java:4857)
        at android.widget.AbsListView.performLongPress(AbsListView.java:3102)
        at android.widget.AbsListView$CheckForLongPress.run(AbsListView.java:3061)
        at android.os.Handler.handleCallback(Handler.java:739)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:135)
        at android.app.ActivityThread.main(ActivityThread.java:5221)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

I'm curious to know if anybody found the same problem and if there's a way around it.

Answer 1

There is indeed an issue on ICS devices when trying to inflate the menu item from the ActionMode with AppCompat v21. It seems the menu items are wrapped 2 times and a wrapped item method gets called instead of the native one, causing this Exception.

Google needs to fix this in a future version of AppCompat.

Anyway, here's a hack I implemented to make it work with the current release:

1) Create an utility class in the package android.support.v7.internal.view.menu (using this package is mandatory to allow accessing package-protected methods without using reflection):

package android.support.v7.internal.view.menu;

import android.view.Menu;

/**
 * Hack to allow inflating ActionMode menus on Android 4.0.x with AppCompat v21
 */
public class MenuUnwrapper {

    public static Menu unwrap(Menu menu) {
        if (menu instanceof MenuWrapperICS) {
            return ((MenuWrapperICS) menu).getWrappedObject();
        }
        return menu;
    }
}

2) Inflate your menu like this:

@Override
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
    mode.getMenuInflater().inflate(R.menu.context_menu, MenuUnwrapper.unwrap(menu));
    return true;
}

---

EDIT:

The bug has been fixed in AppCompat v21.0.2 and this hack is no longer necessary.

Update your tools.

Answer 2

@Override
        public boolean onCreateActionMode(ActionMode mode, Menu menu) {
            Log.d(TAG, "onCreateActionMode");

            MenuItem item = menu.findItem(R.id.menu_item_share);
            mShareActionProvider = (ShareActionProvider) MenuItemCompat.getActionProvider(item);
            MenuItemCompat.setActionProvider(item, mShareActionProvider);

            return true;
        }

Answer 3

Try this. It worked to me.

MenuItem menuItem =  menu.findItem(R.id.search);
if (menuItem != null) {
    MenuItemCompat.setOnActionExpandListener(menuItem,this);
    MenuItemCompat.setActionView(menuItem, mSearchView);
}

Answer 4

Try this

inflater.inflate(R.menu.menu, menu);

// search
MenuItem item = menu.findItem(R.id.settings_search);
MenuItemCompat.setOnActionExpandListener(
    item, new MenuItemCompat.OnActionExpandListener() {

    @Override
    public boolean onMenuItemActionExpand(MenuItem item) {
       return true;
    }

    @Override
    public boolean onMenuItemActionCollapse(MenuItem item) {
        return true;
    }
});