| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.support.v4.view; |
| |
| import android.content.Context; |
| import android.os.Build; |
| import android.support.annotation.NonNull; |
| import android.support.annotation.RequiresApi; |
| import android.util.AttributeSet; |
| import android.util.Log; |
| import android.view.LayoutInflater; |
| import android.view.View; |
| |
| import java.lang.reflect.Field; |
| |
| /** |
| * Helper for accessing features in {@link LayoutInflater}. |
| */ |
| public final class LayoutInflaterCompat { |
| private static final String TAG = "LayoutInflaterCompatHC"; |
| |
| private static Field sLayoutInflaterFactory2Field; |
| private static boolean sCheckedField; |
| |
| @SuppressWarnings("deprecation") |
| static class Factory2Wrapper implements LayoutInflater.Factory2 { |
| final LayoutInflaterFactory mDelegateFactory; |
| |
| Factory2Wrapper(LayoutInflaterFactory delegateFactory) { |
| mDelegateFactory = delegateFactory; |
| } |
| |
| @Override |
| public View onCreateView(String name, Context context, AttributeSet attrs) { |
| return mDelegateFactory.onCreateView(null, name, context, attrs); |
| } |
| |
| @Override |
| public View onCreateView(View parent, String name, Context context, |
| AttributeSet attributeSet) { |
| return mDelegateFactory.onCreateView(parent, name, context, attributeSet); |
| } |
| |
| @Override |
| public String toString() { |
| return getClass().getName() + "{" + mDelegateFactory + "}"; |
| } |
| } |
| |
| /** |
| * For APIs < 21, there was a framework bug that prevented a LayoutInflater's |
| * Factory2 from being merged properly if set after a cloneInContext from a LayoutInflater |
| * that already had a Factory2 registered. We work around that bug here. If we can't we |
| * log an error. |
| */ |
| static void forceSetFactory2(LayoutInflater inflater, LayoutInflater.Factory2 factory) { |
| if (!sCheckedField) { |
| try { |
| sLayoutInflaterFactory2Field = LayoutInflater.class.getDeclaredField("mFactory2"); |
| sLayoutInflaterFactory2Field.setAccessible(true); |
| } catch (NoSuchFieldException e) { |
| Log.e(TAG, "forceSetFactory2 Could not find field 'mFactory2' on class " |
| + LayoutInflater.class.getName() |
| + "; inflation may have unexpected results.", e); |
| } |
| sCheckedField = true; |
| } |
| if (sLayoutInflaterFactory2Field != null) { |
| try { |
| sLayoutInflaterFactory2Field.set(inflater, factory); |
| } catch (IllegalAccessException e) { |
| Log.e(TAG, "forceSetFactory2 could not set the Factory2 on LayoutInflater " |
| + inflater + "; inflation may have unexpected results.", e); |
| } |
| } |
| } |
| |
| static class LayoutInflaterCompatBaseImpl { |
| @SuppressWarnings("deprecation") |
| public void setFactory(LayoutInflater inflater, LayoutInflaterFactory factory) { |
| final LayoutInflater.Factory2 factory2 = factory != null |
| ? new Factory2Wrapper(factory) : null; |
| setFactory2(inflater, factory2); |
| } |
| |
| public void setFactory2(LayoutInflater inflater, LayoutInflater.Factory2 factory) { |
| inflater.setFactory2(factory); |
| |
| final LayoutInflater.Factory f = inflater.getFactory(); |
| if (f instanceof LayoutInflater.Factory2) { |
| // The merged factory is now set to getFactory(), but not getFactory2() (pre-v21). |
| // We will now try and force set the merged factory to mFactory2 |
| forceSetFactory2(inflater, (LayoutInflater.Factory2) f); |
| } else { |
| // Else, we will force set the original wrapped Factory2 |
| forceSetFactory2(inflater, factory); |
| } |
| } |
| |
| @SuppressWarnings("deprecation") |
| public LayoutInflaterFactory getFactory(LayoutInflater inflater) { |
| LayoutInflater.Factory factory = inflater.getFactory(); |
| if (factory instanceof Factory2Wrapper) { |
| return ((Factory2Wrapper) factory).mDelegateFactory; |
| } |
| return null; |
| } |
| } |
| |
| @RequiresApi(21) |
| static class LayoutInflaterCompatApi21Impl extends LayoutInflaterCompatBaseImpl { |
| @SuppressWarnings("deprecation") |
| @Override |
| public void setFactory(LayoutInflater inflater, LayoutInflaterFactory factory) { |
| inflater.setFactory2(factory != null ? new Factory2Wrapper(factory) : null); |
| } |
| |
| @Override |
| public void setFactory2(LayoutInflater inflater, LayoutInflater.Factory2 factory) { |
| inflater.setFactory2(factory); |
| } |
| } |
| |
| static final LayoutInflaterCompatBaseImpl IMPL; |
| static { |
| if (Build.VERSION.SDK_INT >= 21) { |
| IMPL = new LayoutInflaterCompatApi21Impl(); |
| } else { |
| IMPL = new LayoutInflaterCompatBaseImpl(); |
| } |
| } |
| |
| /* |
| * Hide the constructor. |
| */ |
| private LayoutInflaterCompat() { |
| } |
| |
| /** |
| * Attach a custom Factory interface for creating views while using |
| * this LayoutInflater. This must not be null, and can only be set once; |
| * after setting, you can not change the factory. |
| * |
| * @see LayoutInflater#setFactory(android.view.LayoutInflater.Factory) |
| * |
| * @deprecated Use {@link #setFactory2(LayoutInflater, LayoutInflater.Factory2)} instead to set |
| * and {@link LayoutInflater#getFactory2()} to get the factory. |
| */ |
| @Deprecated |
| public static void setFactory( |
| @NonNull LayoutInflater inflater, @NonNull LayoutInflaterFactory factory) { |
| IMPL.setFactory(inflater, factory); |
| } |
| |
| /** |
| * Attach a custom {@link LayoutInflater.Factory2} for creating views while using |
| * this {@link LayoutInflater}. This must not be null, and can only be set once; |
| * after setting, you can not change the factory. |
| * |
| * @see LayoutInflater#setFactory2(android.view.LayoutInflater.Factory2) |
| */ |
| public static void setFactory2( |
| @NonNull LayoutInflater inflater, @NonNull LayoutInflater.Factory2 factory) { |
| IMPL.setFactory2(inflater, factory); |
| } |
| |
| /** |
| * Return the current {@link LayoutInflaterFactory} (or null). This is |
| * called on each element name. If the factory returns a View, add that |
| * to the hierarchy. If it returns null, proceed to call onCreateView(name). |
| * |
| * @return The {@link LayoutInflaterFactory} associated with the |
| * {@link LayoutInflater}. Will be {@code null} if the inflater does not |
| * have a {@link LayoutInflaterFactory} but a raw {@link LayoutInflater.Factory}. |
| * @see LayoutInflater#getFactory() |
| * |
| * @deprecated Use {@link #setFactory2(LayoutInflater, LayoutInflater.Factory2)} to set and |
| * {@link LayoutInflater#getFactory2()} to get the factory. |
| */ |
| @Deprecated |
| public static LayoutInflaterFactory getFactory(LayoutInflater inflater) { |
| return IMPL.getFactory(inflater); |
| } |
| } |