1/* 2 * Copyright (C) 2014 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.v4.view; 18 19import android.os.Build; 20import android.view.LayoutInflater; 21 22/** 23 * Helper for accessing features in {@link android.view.LayoutInflater} 24 * introduced after API level 4 in a backwards compatible fashion. 25 */ 26public class LayoutInflaterCompat { 27 28 interface LayoutInflaterCompatImpl { 29 public void setFactory(LayoutInflater layoutInflater, LayoutInflaterFactory factory); 30 } 31 32 static class LayoutInflaterCompatImplBase implements LayoutInflaterCompatImpl { 33 @Override 34 public void setFactory(LayoutInflater layoutInflater, LayoutInflaterFactory factory) { 35 LayoutInflaterCompatBase.setFactory(layoutInflater, factory); 36 } 37 } 38 39 static class LayoutInflaterCompatImplV11 extends LayoutInflaterCompatImplBase { 40 @Override 41 public void setFactory(LayoutInflater layoutInflater, LayoutInflaterFactory factory) { 42 LayoutInflaterCompatHC.setFactory(layoutInflater, factory); 43 } 44 } 45 46 static class LayoutInflaterCompatImplV21 extends LayoutInflaterCompatImplV11 { 47 @Override 48 public void setFactory(LayoutInflater layoutInflater, LayoutInflaterFactory factory) { 49 LayoutInflaterCompatLollipop.setFactory(layoutInflater, factory); 50 } 51 } 52 53 static final LayoutInflaterCompatImpl IMPL; 54 static { 55 final int version = Build.VERSION.SDK_INT; 56 if (version >= 21) { 57 IMPL = new LayoutInflaterCompatImplV21(); 58 } else if (version >= 11) { 59 IMPL = new LayoutInflaterCompatImplV11(); 60 } else { 61 IMPL = new LayoutInflaterCompatImplBase(); 62 } 63 } 64 65 /* 66 * Hide the constructor. 67 */ 68 private LayoutInflaterCompat() { 69 } 70 71 /** 72 * Attach a custom Factory interface for creating views while using 73 * this LayoutInflater. This must not be null, and can only be set once; 74 * after setting, you can not change the factory. 75 * 76 * @see LayoutInflater#setFactory(android.view.LayoutInflater.Factory) 77 */ 78 public static void setFactory(LayoutInflater inflater, LayoutInflaterFactory factory) { 79 IMPL.setFactory(inflater, factory); 80 } 81 82} 83