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 17package android.support.v7.widget; 18 19import android.content.Context; 20import android.content.res.Resources; 21import android.graphics.drawable.Drawable; 22import android.os.Build; 23import android.support.annotation.NonNull; 24import android.support.v7.app.AppCompatDelegate; 25 26import java.lang.ref.WeakReference; 27 28/** 29 * This class allows us to intercept calls so that we can tint resources (if applicable), and 30 * inflate vector resources from within drawable containers pre-L. 31 * 32 * @hide 33 */ 34public class VectorEnabledTintResources extends Resources { 35 36 public static boolean shouldBeUsed() { 37 return AppCompatDelegate.isCompatVectorFromResourcesEnabled() 38 && Build.VERSION.SDK_INT <= MAX_SDK_WHERE_REQUIRED; 39 } 40 41 /** 42 * The maximum API level where this class is needed. 43 */ 44 public static final int MAX_SDK_WHERE_REQUIRED = 20; 45 46 private final WeakReference<Context> mContextRef; 47 48 public VectorEnabledTintResources(@NonNull final Context context, 49 @NonNull final Resources res) { 50 super(res.getAssets(), res.getDisplayMetrics(), res.getConfiguration()); 51 mContextRef = new WeakReference<>(context); 52 } 53 54 /** 55 * We intercept this call so that we tint the result (if applicable). This is needed for 56 * things like {@link android.graphics.drawable.DrawableContainer}s which can retrieve 57 * their children via this method. 58 */ 59 @Override 60 public Drawable getDrawable(int id) throws NotFoundException { 61 final Context context = mContextRef.get(); 62 if (context != null) { 63 return AppCompatDrawableManager.get().onDrawableLoadedFromResources(context, this, id); 64 } else { 65 return super.getDrawable(id); 66 } 67 } 68 69 final Drawable superGetDrawable(int id) { 70 return super.getDrawable(id); 71 } 72}