How to specify the background color of the context Menu

问题

I use a context menu in an android App to prompt the user to select a Filter. The relevant code is:

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;
}

In the styles.xml file I use the line:

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

to set the background color of the option Menu items. I would like them to have the same color as the Actionbar. The effect is however that the context Menu takes on also the same color.

My question is how I can specify a background color for the Menu items of the context Menu or for the whole context Menu. Is there a way to set it individually? Could I alternatively set the background Color of the option Menu items on an other way without affecting the context Menu?

回答1:

unfortunately You can't customize the context menu,but you can create a Dialog and use that as a ContextMenu.something like this :

@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>

回答2:

Setting a background of android:dropDownListViewStyle did work for me

<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>

回答3:

If you only want to affect dropdowns for menus you can set android:dropDownListViewStyle. This will handle context menus as well as the dropdown menu from the actionbar's overflow menu. I haven't looked into if this also affects PopupMenus.

<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>

Another option is to set the background color that is used in full screen windows across your application theme by setting android:colorBackground like so:

<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>

Check out Android's Documentation for more on android:colorBackground.

来源：https://stackoverflow.com/questions/38872585/how-to-specify-the-background-color-of-the-context-menu

标签

android

styles