1 /* 2 * Copyright (C) 2019 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.graphics.drawable; 18 19 import com.android.layoutlib.bridge.impl.RenderAction; 20 import com.android.tools.layoutlib.annotations.LayoutlibDelegate; 21 22 import android.util.LruCache; 23 import android.view.InflateException; 24 25 import java.lang.reflect.Constructor; 26 27 public class DrawableInflater_Delegate { 28 private static final LruCache<String, Constructor<? extends Drawable>> CONSTRUCTOR_MAP = 29 new LruCache<>(20); 30 31 /** 32 * This is identical to the original method except that it uses LayoutlibCallback to 33 * load the drawable class, which enables loading custom drawables from the project. 34 */ 35 @LayoutlibDelegate inflateFromClass(DrawableInflater thisInflater, String className)36 /* package */ static Drawable inflateFromClass(DrawableInflater thisInflater, 37 String className) { 38 try { 39 Constructor<? extends Drawable> constructor; 40 synchronized (CONSTRUCTOR_MAP) { 41 constructor = CONSTRUCTOR_MAP.get(className); 42 if (constructor == null) { 43 final Class<? extends Drawable> clazz = 44 RenderAction.getCurrentContext().getLayoutlibCallback() 45 .findClass(className).asSubclass(Drawable.class); 46 constructor = clazz.getConstructor(); 47 CONSTRUCTOR_MAP.put(className, constructor); 48 } 49 } 50 return constructor.newInstance(); 51 } catch (ClassCastException e) { 52 // If loaded class is not a Drawable subclass. 53 throw new InflateException("Class is not a Drawable " + className, e); 54 } catch (ClassNotFoundException e) { 55 // If loadClass fails, we should propagate the exception. 56 throw new InflateException("Class not found " + className, e); 57 } catch (Exception e) { 58 throw new InflateException("Error inflating class " + className, e); 59 } 60 } 61 clearConstructorCache()62 public static void clearConstructorCache() { 63 CONSTRUCTOR_MAP.evictAll(); 64 } 65 } 66