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      1 /*
      2  * Copyright (C) 2016 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 com.android.deskclock;
     18 
     19 import android.content.Context;
     20 import android.content.res.ColorStateList;
     21 import android.content.res.TypedArray;
     22 import android.graphics.Color;
     23 import android.graphics.drawable.Drawable;
     24 import android.support.annotation.AttrRes;
     25 import android.support.annotation.ColorInt;
     26 
     27 public final class ThemeUtils {
     28 
     29     /** Temporary array used internally to resolve attributes. */
     30     private static final int[] TEMP_ATTR = new int[1];
     31 
     32     private ThemeUtils() {
     33         // Prevent instantiation.
     34     }
     35 
     36     /**
     37      * Convenience method for retrieving a themed color value.
     38      *
     39      * @param context the {@link Context} to resolve the theme attribute against
     40      * @param attr    the attribute corresponding to the color to resolve
     41      * @return the color value of the resolved attribute
     42      */
     43     @ColorInt
     44     public static int resolveColor(Context context, @AttrRes int attr) {
     45         return resolveColor(context, attr, null /* stateSet */);
     46     }
     47 
     48     /**
     49      * Convenience method for retrieving a themed color value.
     50      *
     51      * @param context  the {@link Context} to resolve the theme attribute against
     52      * @param attr     the attribute corresponding to the color to resolve
     53      * @param stateSet an array of {@link android.view.View} states
     54      * @return the color value of the resolved attribute
     55      */
     56     @ColorInt
     57     public static int resolveColor(Context context, @AttrRes int attr, @AttrRes int[] stateSet) {
     58         final TypedArray a;
     59         synchronized (TEMP_ATTR) {
     60             TEMP_ATTR[0] = attr;
     61             a = context.obtainStyledAttributes(TEMP_ATTR);
     62         }
     63 
     64         try {
     65             if (stateSet == null) {
     66                 return a.getColor(0, Color.RED);
     67             }
     68 
     69             final ColorStateList colorStateList = a.getColorStateList(0);
     70             if (colorStateList != null) {
     71                 return colorStateList.getColorForState(stateSet, Color.RED);
     72             }
     73             return Color.RED;
     74         } finally {
     75             a.recycle();
     76         }
     77     }
     78 
     79     /**
     80      * Convenience method for retrieving a themed drawable.
     81      *
     82      * @param context the {@link Context} to resolve the theme attribute against
     83      * @param attr    the attribute corresponding to the drawable to resolve
     84      * @return the drawable of the resolved attribute
     85      */
     86     public static Drawable resolveDrawable(Context context, @AttrRes int attr) {
     87         final TypedArray a;
     88         synchronized (TEMP_ATTR) {
     89             TEMP_ATTR[0] = attr;
     90             a = context.obtainStyledAttributes(TEMP_ATTR);
     91         }
     92 
     93         try {
     94             return a.getDrawable(0);
     95         } finally {
     96             a.recycle();
     97         }
     98     }
     99 }
    100 
    101