如何指定上下文菜单

时间:2016-08-10 11:47:07

标签: android menu styles

我在Android应用程序中使用上下文菜单来提示用户选择过滤器。相关代码是:

TextView someView = (TextView) findViewById(id.some_view);
registerForContextMenu(someView);

...

@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo)
{
     super.onCreateContextMenu(menu, v, menuInfo);
     menu.setHeaderTitle("Select a Filter");

     menu.add(0, 0, 0, "Filter1");
     menu.add(0, 1, 1, "Filter2");
     menu.add(0, 2, 2, "Filter3");
}

@Override
public boolean onContextItemSelected(MenuItem item)
{
     if (item.getItemId() == 0)
     {
        ...
     }
     else
     {
        ...
     }
     return true;
}

在styles.xml文件中,我使用以下行:

<item name="android:itemBackground">@color/someColor</item>

设置option Menu项的背景颜色。我希望它们与Actionbar具有相同的颜色。然而,效果是context Menu也采用相同的颜色。

我的问题是我如何为Menu的{​​{1}}项或整个上下文菜单指定背景颜色。有没有办法单独设置它?我是否可以在不影响context Menu的情况下另外设置option Menu项目的背景颜色?

3 个答案:

答案 0 :(得分:1)

遗憾的是,您无法自定义上下文菜单,但您可以创建Dialog并将其用作ContextMenu。这样的内容:

@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo)
{
    final Dialog dialog = new Dialog(this);
    dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
    dialog.setContentView(R.layout.menu_layout);

    LinearLayout ll_menu=(LinearLayout)findViewById(R.id.ll_menu);

    //add some TextView or ImageView to ll_menu as menu items


    dialog.show();
}

menu_layout.xml

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

   <LinearLayout
     android:orientation="vertical"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:id="@+id/ll_menu"
     >


  </LinearLayout>

</ScrollView>

答案 1 :(得分:0)

设置背景android:dropDownListViewStyle对我确实有用

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
        <item name="android:dropDownListViewStyle">@style/AppTheme.DropDownList</item>
    </style>
    <style name="AppTheme.DropDownList" parent="Widget.AppCompat.ListView.DropDown">
        <item name="android:background">#f00</item>
    </style>

</resources>

答案 2 :(得分:0)

如果只想影响菜单的下拉菜单,则可以设置android:dropDownListViewStyle。这将处理上下文菜单以及操作栏的溢出菜单中的下拉菜单。我尚未调查这是否还会影响PopupMenu

<resources>
    <!-- Base application theme that you would set in your AndroidManifest. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Theme customizations that will affect your whole application (or anywhere you apply the theme). -->
        <item name="android:dropDownListViewStyle">@style/AppTheme.DropDownList</item>
    </style>

    <style name="AppTheme.DropDownList" parent="Widget.AppCompat.ListView.DropDown">
        <item name="android:background">@android:color/background_light</item>
    </style>
</resources>

另一种选择是通过设置android:colorBackground来设置整个应用程序主题在全屏窗口中使用的背景颜色:

<resources>
    <!-- Base application theme that you would set in your AndroidManifest. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Theme customizations that will affect your whole application (or anywhere you apply the theme). -->
        <item name="android:colorBackground">@android:color/background_light</item>
    </style>
</resources>

android:colorBackground上查看Android's Documentation