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 ThemeUtils()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 resolveColor(Context context, @AttrRes int attr)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 resolveColor(Context context, @AttrRes int attr, @AttrRes int[] stateSet)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 */ resolveDrawable(Context context, @AttrRes int attr)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