wqycsu wqycsu - 4 months ago 19
Android Question

How does this strange condition happens when show menu item icon in toolbar overflow menu?

I want to show a overflow menu in toolbar(AppCompat-v7:22.1.1), below is my menu_main.xml.

<menu 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"
tools:context=".MainActivity">
<item
android:id="@+id/action_search"
android:title="@string/action_search"
android:icon="@mipmap/ic_menu_search"
android:orderInCategory="100"
android:actionViewClass="android.widget.SearchView"
app:showAsAction="ifRoom"/>

<item
android:id="@+id/menu_group_chat"
android:title="@string/menu_group_chat"
android:icon="@mipmap/ic_menu_groupchat" />

<item
android:id="@+id/menu_add_friend"
android:title="@string/menu_add_friend"
android:icon="@mipmap/ic_menu_add_friend" />




After running my app, the icon of menu item is not displayed, then I tried this solution, add an override method onMenuOpened() in my Activty(extends from AppCompatActivity),

@Override
public boolean onMenuOpened(int featureId, Menu menu) {
if(menu!=null){
if(menu.getClass().getSimpleName().equals("MenuBuilder")){
try {
Method m = menu.getClass().getDeclaredMethod(
"setOptionalIconsVisible", Boolean.TYPE);
m.setAccessible(true);
m.invoke(menu, true);
} catch (Exception e) {
e.printStackTrace();
}
}
}
return super.onMenuOpened(featureId, menu);
}


But after running this demo, I find that the icon is still not displayed.

1. Menu with overflow button click

From this reported issue, I know that AppCompatActivity.onMenuOpened is not called any more in 22.x, but it's odd that when I click the hardware menu key in Genymotion, the menu appear at the bottom and with the icon,

2. Menu with menu key click

after closing the menu, I click the overflow button in the toolbar again, these icons in menu appear,

3. Menu with overflow button click

how strange it is! Why this happens?

Answer

For the AppCompactActivity you can put this check on the onPrepareOptionsPanel() instead.

@Override
protected boolean onPrepareOptionsPanel(View view, Menu menu) {
        if (menu != null) {
            if (menu.getClass().getSimpleName().equals("MenuBuilder")) {
                try {
                    Method m = menu.getClass().getDeclaredMethod(
                            "setOptionalIconsVisible", Boolean.TYPE);
                    m.setAccessible(true);
                    m.invoke(menu, true);
                } catch (Exception e) {
                    Log.e(getClass().getSimpleName(), "onMenuOpened...unable to set icons for overflow menu", e);
                }
            }
        }
    return super.onPrepareOptionsPanel(view, menu);
}