[go: nahoru, domu]
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
17package android.support.v7.widget;
18
19import android.content.Context;
20import android.content.res.Resources;
21import android.graphics.drawable.Drawable;
22import android.os.Build;
23import android.support.annotation.NonNull;
24import android.support.v7.app.AppCompatDelegate;
25
26import java.lang.ref.WeakReference;
27
28/**
29 * This class allows us to intercept calls so that we can tint resources (if applicable), and
30 * inflate vector resources from within drawable containers pre-L.
31 *
32 * @hide
33 */
34public class VectorEnabledTintResources extends Resources {
35
36    public static boolean shouldBeUsed() {
37        return AppCompatDelegate.isCompatVectorFromResourcesEnabled()
38                && Build.VERSION.SDK_INT <= MAX_SDK_WHERE_REQUIRED;
39    }
40
41    /**
42     * The maximum API level where this class is needed.
43     */
44    public static final int MAX_SDK_WHERE_REQUIRED = 20;
45
46    private final WeakReference<Context> mContextRef;
47
48    public VectorEnabledTintResources(@NonNull final Context context,
49            @NonNull final Resources res) {
50        super(res.getAssets(), res.getDisplayMetrics(), res.getConfiguration());
51        mContextRef = new WeakReference<>(context);
52    }
53
54    /**
55     * We intercept this call so that we tint the result (if applicable). This is needed for
56     * things like {@link android.graphics.drawable.DrawableContainer}s which can retrieve
57     * their children via this method.
58     */
59    @Override
60    public Drawable getDrawable(int id) throws NotFoundException {
61        final Context context = mContextRef.get();
62        if (context != null) {
63            return AppCompatDrawableManager.get().onDrawableLoadedFromResources(context, this, id);
64        } else {
65            return super.getDrawable(id);
66        }
67    }
68
69    final Drawable superGetDrawable(int id) {
70        return super.getDrawable(id);
71    }
72}