1 /* 2 * Copyright (C) 2018 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 package com.android.launcher3.util; 17 18 import android.content.Context; 19 import android.text.TextUtils; 20 import android.util.Log; 21 22 import java.lang.reflect.InvocationTargetException; 23 24 /** 25 * An interface to indicate that a class is dynamically loaded using resource overlay, hence its 26 * class name and constructor should be preserved by proguard 27 */ 28 public interface ResourceBasedOverride { 29 30 class Overrides { 31 32 private static final String TAG = "Overrides"; 33 getObject( Class<T> clazz, Context context, int resId)34 public static <T extends ResourceBasedOverride> T getObject( 35 Class<T> clazz, Context context, int resId) { 36 String className = context.getString(resId); 37 if (!TextUtils.isEmpty(className)) { 38 try { 39 Class<?> cls = Class.forName(className); 40 return (T) cls.getDeclaredConstructor(Context.class).newInstance(context); 41 } catch (ClassNotFoundException | InstantiationException | IllegalAccessException 42 | ClassCastException | NoSuchMethodException | InvocationTargetException e) { 43 Log.e(TAG, "Bad overriden class", e); 44 } 45 } 46 47 try { 48 return clazz.newInstance(); 49 } catch (InstantiationException|IllegalAccessException e) { 50 throw new RuntimeException(e); 51 } 52 } 53 } 54 } 55