This package is an adaption of the Google Play market_downloader library, for use with Unity Android (as a plugin).

This plugin does NOT solve splitting up a >100MB .apk into .obb (through asset bundles or similar techniques). It merely handles the downloading of .obb files attached to a published .apk, on devices that don't support automatic downloading.

This software is free and published as is, with no warranty and responsibilities - use it at your own risk.

This plugin is published as an AAR, and is compatible with Unity 5+. Minimum Android version supported is Honeycomb (API level 11). For a version compatible with Unity 4 or with older Android devices, please checkout changeset tagged 1.0. The C# API of the plugin is available in IGooglePlayObbDownloader interface. Use GooglePlayObbDownloadManager.GetGooglePlayObbDownloader() to obtain an instance.

0. Add the plugin to your project. You need the AAR and the C# scripts (Assets/Plugins/Android/unityOBBDownloader.aar, Assets/Scripts/GooglePlayDownloader.cs and Assets/Scripts/GooglePlayDownloaderImpl.cs)
1. In your script, don't forget to set PublicKey to your own value. You'll see a message logged and probably a crash if you skip this step
2. Change the Bundle Identifier / Version Code so it matches the application already available on Google Play (that has .obb files attached)
3. Build and Run on your Android device

For a script sample, please refer to Assets/Scripts/DownloadObbExample.cs.

// reason
Android5.0上会抛出IllegalArgumentException

// from code
boolean bindResult = mContext
    .bindService(
            new Intent(new String(Base64.decode("Y29tLmFuZHJvaWQudmVuZGluZy5saWNlbnNpbmcuSUxpY2Vuc2luZ1NlcnZpY2U="))),
            this, // ServiceConnection.
            Context.BIND_AUTO_CREATE);

// to code
Intent serviceIntent = new Intent(new String(Base64.decode("Y29tLmFuZHJvaWQudmVuZGluZy5saWNlbnNpbmcuSUxpY2Vuc2luZ1NlcnZpY2U=")));
serviceIntent.setPackage("com.android.vending");

// 魅族手机绑定服务失败 再次修改为
Intent serviceIntent = new Intent(new String(Base64.decode("Y29tLmFuZHJvaWQudmVuZGluZy5saWNlbnNpbmcuSUxpY2Vuc2luZ1NlcnZpY2U=")));
ResolveInfo resolveInfo = mContext.getPackageManager().resolveService(serviceIntent, 0);
ServiceInfo serviceInfo = resolveInfo.serviceInfo;
ComponentName componentName = new ComponentName(serviceInfo.packageName, serviceInfo.name);
serviceIntent.setComponent(componentName);

// reason
这里会导致绑定的服务在某些情况下无法启动，服务不启动，IDownloaderClient接口的onServiceConnected()方法就不会执行，mRemoteService为null，从而导致NullPointerException。虽然在使用mRemoteService前增加对其是否为null的判断可以避免crash，但是下载过程仍然无法监控，无法得到下载的结果。需要将这段代码替换成如下代码。也就是将BIND_DEBUG_UNBIND替换成BIND_AUTO_CREATE。

// from code
if ( !c.bindService(bindIntent, mConnection, Context.BIND_DEBUG_UNBIND) ) {
    if ( Constants.LOGVV ) {
        Log.d(Constants.TAG, "Service Unbound");
    }
} else {
    mBound = true;
}  

// to code
if ( !c.bindService(bindIntent, mConnection, Context.BIND_AUTO_CREATE) ) {
    if ( Constants.LOGVV ) {
        Log.d(Constants.TAG, "Service Unbound");
    }
} else {
    mBound = true;
}  

excute build.bat

Copyright (C) 2016-2017 Yury Habets

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.

For more information on using .obb files in Unity, please refer to http://docs.unity3d.com/Manual/android-OBBsupport.html and http://developer.android.com/guide/market/expansion-files.html

For more information on Unity Android plugins, please refer to http://docs.unity3d.com/Manual/PluginsForAndroid.html