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 17 package com.android.layoutlib.bridge.android.support; 18 19 import com.android.ide.common.rendering.api.LayoutLog; 20 import com.android.ide.common.rendering.api.LayoutlibCallback; 21 import com.android.layoutlib.bridge.Bridge; 22 import com.android.layoutlib.bridge.android.BridgeContext; 23 import com.android.layoutlib.bridge.android.RenderParamsFlags; 24 import com.android.layoutlib.bridge.util.ReflectionUtils; 25 import com.android.layoutlib.bridge.util.ReflectionUtils.ReflectionException; 26 27 import android.annotation.NonNull; 28 import android.annotation.Nullable; 29 import android.content.Context; 30 import android.view.View; 31 32 import static com.android.layoutlib.bridge.util.ReflectionUtils.getCause; 33 import static com.android.layoutlib.bridge.util.ReflectionUtils.getMethod; 34 import static com.android.layoutlib.bridge.util.ReflectionUtils.invoke; 35 36 /** 37 * Utility class for working with android.support.v7.widget.RecyclerView 38 */ 39 public class RecyclerViewUtil { 40 41 private static final String RV_PKG_PREFIX = "android.support.v7.widget."; 42 public static final String CN_RECYCLER_VIEW = RV_PKG_PREFIX + "RecyclerView"; 43 private static final String CN_LAYOUT_MANAGER = CN_RECYCLER_VIEW + "$LayoutManager"; 44 private static final String CN_ADAPTER = CN_RECYCLER_VIEW + "$Adapter"; 45 46 // LinearLayoutManager related constants. 47 private static final String CN_LINEAR_LAYOUT_MANAGER = RV_PKG_PREFIX + "LinearLayoutManager"; 48 private static final Class<?>[] LLM_CONSTRUCTOR_SIGNATURE = new Class<?>[]{Context.class}; 49 50 /** 51 * Tries to create an Adapter ({@code android.support.v7.widget.RecyclerView.Adapter} and a 52 * LayoutManager {@code RecyclerView.LayoutManager} and assign these to the {@code RecyclerView} 53 * that is passed. 54 * <p/> 55 * Any exceptions thrown during the process are logged in {@link Bridge#getLog()} 56 */ 57 public static void setAdapter(@NonNull View recyclerView, @NonNull BridgeContext context, 58 @NonNull LayoutlibCallback layoutlibCallback, int adapterLayout, int itemCount) { 59 try { 60 setLayoutManager(recyclerView, context, layoutlibCallback); 61 Object adapter = createAdapter(layoutlibCallback); 62 if (adapter != null) { 63 setProperty(recyclerView, CN_ADAPTER, adapter, "setAdapter"); 64 setProperty(adapter, int.class, adapterLayout, "setLayoutId"); 65 66 if (itemCount != -1) { 67 setProperty(adapter, int.class, itemCount, "setItemCount"); 68 } 69 } 70 } catch (ReflectionException e) { 71 Throwable cause = getCause(e); 72 Bridge.getLog().error(LayoutLog.TAG_BROKEN, 73 "Error occurred while trying to setup RecyclerView.", cause, null); 74 } 75 } 76 77 private static void setLayoutManager(@NonNull View recyclerView, @NonNull BridgeContext context, 78 @NonNull LayoutlibCallback callback) throws ReflectionException { 79 if (getLayoutManager(recyclerView) == null) { 80 // Only set the layout manager if not already set by the recycler view. 81 Object layoutManager = createLayoutManager(context, callback); 82 if (layoutManager != null) { 83 setProperty(recyclerView, CN_LAYOUT_MANAGER, layoutManager, "setLayoutManager"); 84 } 85 } 86 } 87 88 /** Creates a LinearLayoutManager using the provided context. */ 89 @Nullable 90 private static Object createLayoutManager(@NonNull Context context, 91 @NonNull LayoutlibCallback callback) 92 throws ReflectionException { 93 try { 94 return callback.loadView(CN_LINEAR_LAYOUT_MANAGER, LLM_CONSTRUCTOR_SIGNATURE, 95 new Object[]{context}); 96 } catch (Exception e) { 97 throw new ReflectionException(e); 98 } 99 } 100 101 @Nullable 102 private static Object getLayoutManager(View recyclerView) throws ReflectionException { 103 return invoke(getMethod(recyclerView.getClass(), "getLayoutManager"), recyclerView); 104 } 105 106 @Nullable 107 private static Object createAdapter(@NonNull LayoutlibCallback layoutlibCallback) 108 throws ReflectionException { 109 Boolean ideSupport = 110 layoutlibCallback.getFlag(RenderParamsFlags.FLAG_KEY_RECYCLER_VIEW_SUPPORT); 111 if (ideSupport != Boolean.TRUE) { 112 return null; 113 } 114 try { 115 return layoutlibCallback.loadClass(CN_ADAPTER, new Class[0], new Object[0]); 116 } catch (Exception e) { 117 throw new ReflectionException(e); 118 } 119 } 120 121 private static void setProperty(@NonNull Object object, @NonNull String propertyClassName, 122 @NonNull Object propertyValue, @NonNull String propertySetter) 123 throws ReflectionException { 124 Class<?> propertyClass = ReflectionUtils.getClassInstance(propertyValue, propertyClassName); 125 setProperty(object, propertyClass, propertyValue, propertySetter); 126 } 127 128 private static void setProperty(@NonNull Object object, @NonNull Class<?> propertyClass, 129 @Nullable Object propertyValue, @NonNull String propertySetter) 130 throws ReflectionException { 131 invoke(getMethod(object.getClass(), propertySetter, propertyClass), object, propertyValue); 132 } 133 134 } 135