1 /*
2  * Copyright (C) 2015 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package android.support.design.widget;
18 
19 import android.content.Context;
20 import android.content.res.TypedArray;
21 import android.support.design.R;
22 
23 class ThemeUtils {
24 
25     private static final int[] APPCOMPAT_CHECK_ATTRS = {
26             android.support.v7.appcompat.R.attr.colorPrimary
27     };
28 
checkAppCompatTheme(Context context)29     static void checkAppCompatTheme(Context context) {
30         TypedArray a = context.obtainStyledAttributes(APPCOMPAT_CHECK_ATTRS);
31         final boolean failed = !a.hasValue(0);
32         if (a != null) {
33             a.recycle();
34         }
35         if (failed) {
36             throw new IllegalArgumentException("You need to use a Theme.AppCompat theme "
37                     + "(or descendant) with the design library.");
38         }
39     }
40 }
41