如何捕获对菜单项的长按？

Question

我有一个典型的菜单，我想为其中一项设置一个 onLongClickListener 。换句话说，我希望该项目执行正常的 onOptionsItemSelected 功能以及长按功能。

    MenuItem item;
    item = menu.findItem(android.R.id.home);

item.setOnLongClickListener(new OnLongClickListener() {
        public boolean onLongClick(View v) {
            Context context = getApplicationContext();
            CharSequence text = "Long Press";
            int duration = Toast.LENGTH_SHORT;

            Toast toast = Toast.makeText(context, text, duration);
            toast.show();
            return true;
        }

    });

Answer 1

我只需在 menuItem 上使用 setActionView 即可做到这一点。如果有帮助，您可以按照此过程进行操作。

    for(int i = 0; i < menu.size(); i++){
        View v = new View(this);
        v.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {
                //Your longclick listener callback logic goes here
                return false;
            }

        });
        menu.getItem(i).setActionView(v);
    }

Answer 2

使用 Menu 上的 findItem 方法获取视图，并在每个视图上设置长按监听器。

Answer 3

这种方法是不对的，它会扰乱整个流程，但你可以这样做：

    private interface OnMenuItemLongClickListener{
        boolean onMenuItemLongClik(MenuItem m);
    }
    private void getMenuItemsView(Activity a, final Menu m, final OnMenuItemLongClickListener listener) throws NoSuchFieldException, IllegalArgumentException, IllegalAccessException{
        View homeButton = a.findViewById(android.R.id.home);
        ViewParent parentOfHome = homeButton.getParent().getParent(); //ActionBarView is parent of home ImageView, see layout file in sources

        if (!parentOfHome.getClass().getName().contains("ActionBarView")) {
            parentOfHome = parentOfHome.getParent(); 
            Class absAbv = parentOfHome.getClass().getSuperclass(); //ActionBarView -> AbsActionBarView class
            Field actionMenuPresenterField = absAbv.getDeclaredField("mActionMenuPresenter");
            actionMenuPresenterField.setAccessible(true);
            Object actionMenuPresenter = actionMenuPresenterField.get(parentOfHome);
            Field actionMenuViewField = actionMenuPresenter.getClass().getSuperclass().getDeclaredField("mMenuView");
            actionMenuViewField.setAccessible(true);
            Object actionMenuView = actionMenuViewField.get(actionMenuPresenter);
            Field childrenField= actionMenuView.getClass().getSuperclass().getSuperclass().getDeclaredField("mChildren");
            childrenField.setAccessible(true);
            Field menuField =actionMenuPresenter.getClass().getSuperclass().getDeclaredField("mMenu");
            menuField.setAccessible(true);
            Object menu = menuField.get(actionMenuPresenter);
            Object[] menuItemsAsViews = (Object[])childrenField.get(actionMenuView);
            View.OnLongClickListener longListener = new View.OnLongClickListener() {

                @Override
                public boolean onLongClick(View v) {

                    return listener.onMenuItemLongClik(m.findItem(v.getId()));
                }
            };
            for(Object menuView:menuItemsAsViews ){
                View v = (View)menuView;
                v.setOnLongClickListener(longListener);
            }


    }
 }

用法：

@Override
public boolean onPrepareOptionsMenu(final Menu menu) {
        new Handler().postDelayed(new Runnable(){

            @Override
            public void run() {
            getMenuItemsViews(MainActivity.this, menu);
            }}, 100); //must be called after the menu views are generated, otherwise NPE.
    return super.onPrepareOptionsMenu(menu);
}

菜单项在溢出不会被考虑。