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#234 Add APK expansion library
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‎android/src/main/AndroidManifest.xml

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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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package="com.RNFetchBlob">
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<!-- Required to access Google Play Licensing -->
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<uses-permission android:name="com.android.vending.CHECK_LICENSE" />
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<!-- Required to download files from Google Play -->
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<uses-permission android:name="android.permission.INTERNET" />
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<!-- Required to keep CPU alive while downloading files
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(NOT to keep screen awake) -->
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<uses-permission android:name="android.permission.WAKE_LOCK" />
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<!-- Required to poll the state of the network connection
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and respond to changes -->
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<uses-permission
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android:name="android.permission.ACCESS_NETWORK_STATE" />
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<!-- Required to check whether Wi-Fi is enabled -->
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<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
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<!-- Required to read and write the expansion files on shared storage -->
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<uses-permission
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android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
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<application
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android:label="@string/app_name">
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‎android/src/main/java/com/android/vending/expansion/zipfile/APEZProvider.java

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package com.android.vending.expansion.zipfile;
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/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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//To implement APEZProvider in your application, you'll want to change
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//the AUTHORITY to match what you define in the manifest.
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import com.android.vending.expansion.zipfile.ZipResourceFile.ZipEntryRO;
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import android.content.ContentProvider;
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import android.content.ContentProviderOperation;
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import android.content.ContentProviderResult;
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import android.content.ContentValues;
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import android.content.Context;
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import android.content.OperationApplicationException;
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import android.content.pm.PackageInfo;
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import android.content.pm.PackageManager;
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import android.content.pm.PackageManager.NameNotFoundException;
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import android.content.pm.ProviderInfo;
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import android.content.res.AssetFileDescriptor;
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import android.database.Cursor;
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import android.database.MatrixCursor;
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import android.net.Uri;
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import android.os.ParcelFileDescriptor;
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import android.provider.BaseColumns;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.util.ArrayList;
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/**
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* This content provider is an optional part of the library.
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*
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* <p>Most apps don't need to use this class. This defines a
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* ContentProvider that marshalls the data from the ZIP files through a
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* content provider Uri in order to provide file access for certain Android APIs
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* that expect Uri access to media files.
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*
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*/
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public abstract class APEZProvider extends ContentProvider {
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private ZipResourceFile mAPKExtensionFile;
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private boolean mInit;
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public static final String FILEID = BaseColumns._ID;
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public static final String FILENAME = "ZPFN";
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public static final String ZIPFILE = "ZFIL";
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public static final String MODIFICATION = "ZMOD";
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public static final String CRC32 = "ZCRC";
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public static final String COMPRESSEDLEN = "ZCOL";
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public static final String UNCOMPRESSEDLEN = "ZUNL";
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public static final String COMPRESSIONTYPE = "ZTYP";
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public static final String[] ALL_FIELDS = {
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FILEID,
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FILENAME,
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ZIPFILE,
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MODIFICATION,
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CRC32,
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COMPRESSEDLEN,
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UNCOMPRESSEDLEN,
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COMPRESSIONTYPE
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};
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public static final int FILEID_IDX = 0;
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public static final int FILENAME_IDX = 1;
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public static final int ZIPFILE_IDX = 2;
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public static final int MOD_IDX = 3;
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public static final int CRC_IDX = 4;
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public static final int COMPLEN_IDX = 5;
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public static final int UNCOMPLEN_IDX = 6;
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public static final int COMPTYPE_IDX = 7;
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public static final int[] ALL_FIELDS_INT = {
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FILEID_IDX,
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FILENAME_IDX,
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ZIPFILE_IDX,
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MOD_IDX,
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CRC_IDX,
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COMPLEN_IDX,
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UNCOMPLEN_IDX,
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COMPTYPE_IDX
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};
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/**
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* This needs to match the authority in your manifest
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*/
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public abstract String getAuthority();
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@Override
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public int delete(Uri arg0, String arg1, String[] arg2) {
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// TODO Auto-generated method stub
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return 0;
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}
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@Override
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public String getType(Uri uri) {
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return "vnd.android.cursor.item/asset";
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}
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@Override
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public Uri insert(Uri uri, ContentValues values) {
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// TODO Auto-generated method stub
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return null;
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}
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static private final String NO_FILE = "N";
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private boolean initIfNecessary() {
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if ( !mInit ) {
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Context ctx = getContext();
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PackageManager pm = ctx.getPackageManager();
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ProviderInfo pi = pm.resolveContentProvider(getAuthority(), PackageManager.GET_META_DATA);
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PackageInfo packInfo;
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try {
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packInfo = pm.getPackageInfo(ctx.getPackageName(), 0);
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} catch (NameNotFoundException e1) {
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e1.printStackTrace();
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return false;
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}
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int patchFileVersion;
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int mainFileVersion;
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int appVersionCode = packInfo.versionCode;
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String[] resourceFiles = null;
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if ( null != pi.metaData ) {
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mainFileVersion = pi.metaData.getInt("mainVersion", appVersionCode);
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patchFileVersion = pi.metaData.getInt("patchVersion", appVersionCode);
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String mainFileName = pi.metaData.getString("mainFilename", NO_FILE);
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if ( NO_FILE != mainFileName ) {
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String patchFileName = pi.metaData.getString("patchFilename", NO_FILE);
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if ( NO_FILE != patchFileName ) {
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resourceFiles = new String[] { mainFileName, patchFileName };
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} else {
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resourceFiles = new String[] { mainFileName };
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}
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}
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} else {
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mainFileVersion = patchFileVersion = appVersionCode;
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}
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try {
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if ( null == resourceFiles ) {
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mAPKExtensionFile = APKExpansionSupport.getAPKExpansionZipFile(ctx, mainFileVersion, patchFileVersion);
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} else {
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mAPKExtensionFile = APKExpansionSupport.getResourceZipFile(resourceFiles);
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}
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mInit = true;
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return true;
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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return false;
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}
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@Override
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public boolean onCreate() {
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return true;
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}
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@Override
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public AssetFileDescriptor openAssetFile(Uri uri, String mode)
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throws FileNotFoundException {
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initIfNecessary();
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String path = uri.getEncodedPath();
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if ( path.startsWith("/") ) {
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path = path.substring(1);
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}
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return mAPKExtensionFile.getAssetFileDescriptor(path);
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}
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@Override
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public ContentProviderResult[] applyBatch(
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ArrayList<ContentProviderOperation> operations)
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throws OperationApplicationException {
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initIfNecessary();
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return super.applyBatch(operations);
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}
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@Override
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public ParcelFileDescriptor openFile(Uri uri, String mode)
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throws FileNotFoundException {
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initIfNecessary();
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AssetFileDescriptor af = openAssetFile(uri, mode);
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if ( null != af ) {
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return af.getParcelFileDescriptor();
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}
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return null;
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}
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@Override
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public Cursor query(Uri uri, String[] projection, String selection,
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String[] selectionArgs, String sortOrder) {
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initIfNecessary();
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// lists all of the items in the file that match
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ZipEntryRO[] zipEntries;
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if ( null == mAPKExtensionFile ) {
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zipEntries = new ZipEntryRO[0];
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} else {
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zipEntries = mAPKExtensionFile.getAllEntries();
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}
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int[] intProjection;
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if ( null == projection ) {
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intProjection = ALL_FIELDS_INT;
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projection = ALL_FIELDS;
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} else {
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int len = projection.length;
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intProjection = new int[len];
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for ( int i = 0; i < len; i++ ) {
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if ( projection[i].equals(FILEID) ) {
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intProjection[i] = FILEID_IDX;
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} else if ( projection[i].equals(FILENAME) ) {
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intProjection[i] = FILENAME_IDX;
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} else if ( projection[i].equals(ZIPFILE) ) {
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intProjection[i] = ZIPFILE_IDX;
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} else if ( projection[i].equals(MODIFICATION) ) {
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intProjection[i] = MOD_IDX;
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} else if ( projection[i].equals(CRC32) ) {
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intProjection[i] = CRC_IDX;
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} else if ( projection[i].equals(COMPRESSEDLEN) ) {
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intProjection[i] = COMPLEN_IDX;
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} else if ( projection[i].equals(UNCOMPRESSEDLEN) ) {
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intProjection[i] = UNCOMPLEN_IDX;
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} else if ( projection[i].equals(COMPRESSIONTYPE) ) {
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intProjection[i] = COMPTYPE_IDX;
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} else {
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throw new RuntimeException();
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}
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}
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}
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MatrixCursor mc = new MatrixCursor(projection, zipEntries.length);
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int len = intProjection.length;
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for ( ZipEntryRO zer : zipEntries ) {
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MatrixCursor.RowBuilder rb = mc.newRow();
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for ( int i = 0; i < len; i++ ) {
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switch (intProjection[i]) {
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case FILEID_IDX:
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rb.add(i);
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break;
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case FILENAME_IDX:
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rb.add(zer.mFileName);
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break;
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case ZIPFILE_IDX:
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rb.add(zer.getZipFileName());
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break;
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case MOD_IDX:
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rb.add(zer.mWhenModified);
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break;
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case CRC_IDX:
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rb.add(zer.mCRC32);
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break;
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case COMPLEN_IDX:
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rb.add(zer.mCompressedLength);
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break;
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case UNCOMPLEN_IDX:
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rb.add(zer.mUncompressedLength);
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break;
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case COMPTYPE_IDX:
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rb.add(zer.mMethod);
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break;
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}
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}
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}
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return mc;
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}
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@Override
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public int update(Uri uri, ContentValues values, String selection,
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String[] selectionArgs) {
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// TODO Auto-generated method stub
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return 0;
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}
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}

‎android/src/main/java/com/android/vending/expansion/zipfile/APKExpansionSupport.java

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package com.android.vending.expansion.zipfile;
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/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import java.io.File;
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import java.io.FileFilter;
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import java.io.IOException;
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import java.util.Vector;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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import android.content.Context;
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import android.os.Environment;
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import android.util.Log;
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public class APKExpansionSupport {
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// The shared path to all app expansion files
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private final static String EXP_PATH = "/Android/obb/";
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static String[] getAPKExpansionFiles(Context ctx, int mainVersion, int patchVersion) {
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String packageName = ctx.getPackageName();
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Vector<String> ret = new Vector<String>();
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if (Environment.getExternalStorageState().equals(
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Environment.MEDIA_MOUNTED)) {
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// Build the full path to the app's expansion files
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File root = Environment.getExternalStorageDirectory();
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File expPath = new File(root.toString() + EXP_PATH + packageName);
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// Check that expansion file path exists
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if (expPath.exists()) {
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if ( mainVersion > 0 ) {
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String strMainPath = expPath + File.separator + "main." + mainVersion + "." + packageName + ".obb";
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File main = new File(strMainPath);
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if ( main.isFile() ) {
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ret.add(strMainPath);
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}
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}
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if ( patchVersion > 0 ) {
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String strPatchPath = expPath + File.separator + "patch." + patchVersion + "." + packageName + ".obb";
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File main = new File(strPatchPath);
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if ( main.isFile() ) {
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ret.add(strPatchPath);
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}
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}
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}
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}
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String[] retArray = new String[ret.size()];
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ret.toArray(retArray);
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return retArray;
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}
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static public ZipResourceFile getResourceZipFile(String[] expansionFiles) throws IOException {
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ZipResourceFile apkExpansionFile = null;
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for (String expansionFilePath : expansionFiles) {
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if ( null == apkExpansionFile ) {
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apkExpansionFile = new ZipResourceFile(expansionFilePath);
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} else {
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apkExpansionFile.addPatchFile(expansionFilePath);
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}
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}
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return apkExpansionFile;
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}
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static public ZipResourceFile getAPKExpansionZipFile(Context ctx, int mainVersion, int patchVersion) throws IOException{
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String[] expansionFiles = getAPKExpansionFiles(ctx, mainVersion, patchVersion);
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return getResourceZipFile(expansionFiles);
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}
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}

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