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.tools.layoutlib.annotations.LayoutlibDelegate; 20 21 import android.content.res.Resources_Delegate; 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 Resources_Delegate.getLayoutlibCallback(thisInflater.mRes) 45 .findClass(className).asSubclass(Drawable.class); 46 constructor = clazz.getConstructor(); 47 CONSTRUCTOR_MAP.put(className, constructor); 48 } 49 } 50 return constructor.newInstance(); 51 } catch (NoSuchMethodException e) { 52 final InflateException ie = new InflateException("Error inflating class " + className); 53 ie.initCause(e); 54 throw ie; 55 } catch (ClassCastException e) { 56 // If loaded class is not a Drawable subclass. 57 final InflateException ie = 58 new InflateException("Class is not a Drawable " + className); 59 ie.initCause(e); 60 throw ie; 61 } catch (ClassNotFoundException e) { 62 // If loadClass fails, we should propagate the exception. 63 final InflateException ie = new InflateException("Class not found " + className); 64 ie.initCause(e); 65 throw ie; 66 } catch (Exception e) { 67 final InflateException ie = new InflateException("Error inflating class " + className); 68 ie.initCause(e); 69 throw ie; 70 } 71 } 72 clearConstructorCache()73 public static void clearConstructorCache() { 74 CONSTRUCTOR_MAP.evictAll(); 75 } 76 } 77