PopupMenu图标没有显示

Question

我创建了一个ListView，它在每个项目中都有一个PopupMenu。我创建了一个menu layout并使用它作为我的PopupMenu。我的问题是，每次单击ListView项中的省略号选项时，PopupMenu都会与Text一起显示，但Icon不会出现。

这是我的xml菜单：

<menu
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">

<item
    android:id="@+id/action_retry"
    android:icon="@drawable/retry"
    android:title="@string/retry"
    app:showAsAction="always"
    />
<item
    android:id="@+id/action_delete"
    android:icon="@drawable/delete"
    android:title="@string/delete"
    app:showAsAction="always"
    />
 </menu>

那么在我的Adapter中，我的ListView是这样的：

public class MyListViewAdapter extends BaseAdapter implements MenuItem.OnMenuItemClickListener {

.....

 @Override
public View getView(final int position, View convertView, ViewGroup parent) {

    if (convertView == null) {
        LayoutInflater inflater = activity.getLayoutInflater();
        convertView = inflater.inflate(R.layout.mylistrow, null);
    }

    final View action = (View) convertView.findViewById(R.id.action);

    action.setOnClickListener(new View.OnClickListener(){
        public void onClick(View v) {
            showPopup(action, position);
                      }
    });

    // ....codes for listview creation....

    return convertView;
}

public void showPopup(View v, int listItemPosition) {
    PopupMenu popup = new PopupMenu(mContext, v);
    MenuInflater inflater = popup.getMenuInflater();
    inflater.inflate(R.menu.outbox_menu, popup.getMenu());
    popup.show();
}

@Override
public boolean onMenuItemClick(MenuItem item) {

    switch (item.getItemId()) {
        case R.id.action_retry:

            return true;
        case R.id.action_delete:

            return true;
        default:
            return false;
    }
}

提前谢谢你的帮助。

Answer 1

我在这个链接中找到了一个解决方案，并将它应用到我的代码中。

PopupMenu popup = new PopupMenu(mContext, view);
    try {
        Field[] fields = popup.getClass().getDeclaredFields();
        for (Field field : fields) {
            if ("mPopup".equals(field.getName())) {
                field.setAccessible(true);
                Object menuPopupHelper = field.get(popup);
                Class<?> classPopupHelper = Class.forName(menuPopupHelper.getClass().getName());
                Method setForceIcons = classPopupHelper.getMethod("setForceShowIcon", boolean.class);
                setForceIcons.invoke(menuPopupHelper, true);
                break;
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }

Answer 2

MenuBuilder是一个隐藏类，但包含一个显示图标的方法。您需要使用反射来显示菜单中的图标。尝试在showPopop(View, int)中添加以下内容

PopupMenu popup = new PopupMenu(mContext, v);
try {
  Method method = popup.getMenu().getClass().getDeclaredMethod("setOptionalIconsVisible", boolean.class);
  method.setAccessible(true);
  method.invoke(popup.getMenu(), true);
} catch (Exception e) {
  e.printStackTrace();
}

Answer 3

用这个代替android.widget.PopupMenu

androidx.appcompat.widget.PopupMenu popupMenu = new PopupMenu(this,view, Gravity.END);
popupMenu.setForceShowIcon(true);