Android的动作条ActionProvider子 [英] Android ActionBar ActionProvider submenu

问题描述

我只是不能得到ActionProvider显示一个子菜单，我不undestand原因。在XML我有我的菜单定义的：

I just can't get the ActionProvider to show a submenu and I don't undestand why. I have my menu defined in xml:

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">

<item
        android:id="@+id/dossier_menu"
        android:showAsAction="always"
        android:actionProviderClass="com.some.other.mockup.MActionProvider">
</item>
</menu>

行动提供一流的：

action provider class:

public class MActionProvider extends ActionProvider  {

private static final String TAG = "MActionProvider";
private static final int LIST_LENGTH = 3;
private Context context;

/**
 * Creates a new instance.
 *
 * @param context Context for accessing resources.
 */
public MezzActionProvider(Context context) {
    super(context);
    this.context = context;
}

@Override
public View onCreateActionView() {
    View view = View.inflate(context, R.layout.action_layout, null);
    //view must be returned not tetxView or just buttonView
    return view;
}

@Override
public boolean hasSubMenu() {
    Log.d(TAG, "hasSubMenu");
    return true;
}


@Override
public boolean onPerformDefaultAction() {
    Log.d(TAG, "onPerformDefaultAction");
    return super.onPerformDefaultAction();
}

/**add submenu in code**/
@Override
public void onPrepareSubMenu(SubMenu subMenu) {
    Log.d(TAG, "onPrepareSubMenu");

    subMenu.clear();
    subMenu.add(Menu.NONE, Menu.NONE, 1,"Mezz 1");
    subMenu.add(Menu.NONE, Menu.NONE, 2, "Mezz 2");

}

}

和操作布局是：

<TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Mezz State ++"
        android:id="@+id/textView"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_margin="4dp"/>
<ImageView
        android:layout_width="wrap_content"
        android:layout_height="@dimen/buttonHeight"
        android:src="@android:drawable/ic_menu_add"
        android:layout_alignParentLeft="true"
        android:id="@+id/img1"
        android:layout_below="@id/textView"/>

我尝试使用按钮，而不是图像视图，甚至试图添加子菜单以XML的菜单项，当我点击的动作提供者，它只是不显示任何子我想不出为什么。

I tried using button instead of image view, even tried adding submenu to the menu item in xml, when I click on the action provider it just doesn't show any submenu I can't figure out why.

感谢

推荐答案

我已经找到了答案在这里：

I have found the answer here:

<一个href="http://stackoverflow.com/questions/19439106/cant-display-sub-menu-for-custom-actionprovider">Can't显示子菜单的自定义ActionProvider

问题是我的onCreateActionView（）方法没有返回null。

Problem is my onCreateActionView() method doesn't return null.

所以，感谢杰森·罗宾逊回答方法如下：

So thanks to Jason Robinson answer here is how:

@Override
public View onCreateActionView() {
  View view = View.inflate(context, R.layout.action_layout, null);

  final PopupMenu menu = new PopupMenu(mContext, view);
  menu.inflate(R.menu.submenu);
  menu.setOnMenuItemClickListener(this);

  view.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v){
        menu.show();
    }
  });

return view;
}

和submenu.xml包括：

and submenu.xml contains:

<?xml version="1.0" encoding="utf-8"?>

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

    <item
            android:id="@+id/mezzSub1"
            android:title="Mezz 1"
            android:showAsAction="always"></item>
    <item
            android:id="@+id/mezzSub2"
            android:title="Mezz 2"
            android:showAsAction="always"></item>

</menu>

这篇关于Android的动作条ActionProvider子的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！