| /* |
| * Copyright (C) 2019 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.content.res.loader; |
| |
| import android.annotation.NonNull; |
| import android.content.Context; |
| import android.content.pm.ApplicationInfo; |
| import android.content.res.ApkAssets; |
| import android.content.res.Resources; |
| import android.os.ParcelFileDescriptor; |
| import android.os.SharedMemory; |
| |
| import com.android.internal.util.ArrayUtils; |
| |
| import java.io.Closeable; |
| import java.io.IOException; |
| |
| /** |
| * Provides methods to load resources from an .apk or .arsc file to pass to |
| * {@link Resources#addLoader(ResourceLoader, ResourcesProvider, int)}. |
| * |
| * It is the responsibility of the app to close any instances. |
| */ |
| public final class ResourcesProvider implements AutoCloseable, Closeable { |
| |
| /** |
| * Contains no data, assuming that any resource loading behavior will be handled in the |
| * corresponding {@link ResourceLoader}. |
| */ |
| @NonNull |
| public static ResourcesProvider empty() { |
| return new ResourcesProvider(ApkAssets.loadEmptyForLoader()); |
| } |
| |
| /** |
| * Read from an .apk file descriptor. |
| * |
| * The file descriptor is duplicated and the one passed in may be closed by the application |
| * at any time. |
| */ |
| @NonNull |
| public static ResourcesProvider loadFromApk(@NonNull ParcelFileDescriptor fileDescriptor) |
| throws IOException { |
| return new ResourcesProvider( |
| ApkAssets.loadApkForLoader(fileDescriptor.getFileDescriptor())); |
| } |
| |
| /** |
| * Read from an .apk file representation in memory. |
| */ |
| @NonNull |
| public static ResourcesProvider loadFromApk(@NonNull SharedMemory sharedMemory) |
| throws IOException { |
| return new ResourcesProvider( |
| ApkAssets.loadApkForLoader(sharedMemory.getFileDescriptor())); |
| } |
| |
| /** |
| * Read from an .arsc file descriptor. |
| * |
| * The file descriptor is duplicated and the one passed in may be closed by the application |
| * at any time. |
| */ |
| @NonNull |
| public static ResourcesProvider loadFromArsc(@NonNull ParcelFileDescriptor fileDescriptor) |
| throws IOException { |
| return new ResourcesProvider( |
| ApkAssets.loadArscForLoader(fileDescriptor.getFileDescriptor())); |
| } |
| |
| /** |
| * Read from an .arsc file representation in memory. |
| */ |
| @NonNull |
| public static ResourcesProvider loadFromArsc(@NonNull SharedMemory sharedMemory) |
| throws IOException { |
| return new ResourcesProvider( |
| ApkAssets.loadArscForLoader(sharedMemory.getFileDescriptor())); |
| } |
| |
| /** |
| * Read from a split installed alongside the application, which may not have been |
| * loaded initially because the application requested isolated split loading. |
| */ |
| @NonNull |
| public static ResourcesProvider loadFromSplit(@NonNull Context context, |
| @NonNull String splitName) throws IOException { |
| ApplicationInfo appInfo = context.getApplicationInfo(); |
| int splitIndex = ArrayUtils.indexOf(appInfo.splitNames, splitName); |
| if (splitIndex < 0) { |
| throw new IllegalArgumentException("Split " + splitName + " not found"); |
| } |
| |
| String splitPath = appInfo.getSplitCodePaths()[splitIndex]; |
| return new ResourcesProvider(ApkAssets.loadApkForLoader(splitPath)); |
| } |
| |
| |
| @NonNull |
| private final ApkAssets mApkAssets; |
| |
| private ResourcesProvider(@NonNull ApkAssets apkAssets) { |
| this.mApkAssets = apkAssets; |
| } |
| |
| /** @hide */ |
| @NonNull |
| public ApkAssets getApkAssets() { |
| return mApkAssets; |
| } |
| |
| @Override |
| public void close() { |
| try { |
| mApkAssets.close(); |
| } catch (Throwable ignored) { |
| } |
| } |
| |
| @Override |
| protected void finalize() throws Throwable { |
| close(); |
| super.finalize(); |
| } |
| } |