java - 广播接收器作为Android中的内部类

Question

在我的代码中有一个扩展BroadcastReceiver的内部类。

我在 AndroidManifest.xml 中添加了以下行:

<receiver android:name="OuterClass$InnerClass android:enabled="true"/>

但我收到以下错误:

unable to instantiate receiver org.example.test.OuterClass$InnerClass

我该如何解决这个问题？

Answer 1

一个(非静态)inner class Android 无法通过 AndroidManifest.xml ( Android developer documentation on BroadcastReceiver ) 实例化:

You can either dynamically register an instance of this class with Context.registerReceiver() or statically publish an implementation through the tag in your AndroidManifest.xml.

所以你可以动态注册接收者。在我的应用程序中，我想使用 Google 的 Cloud to Device Messaging (C2DM) 和我的原始 AndroidManifest.xml 执行相同的操作:

<application...>
    <receiver android:name=".MyC2dmReceiver" android:permission="com.google.android.c2dm.permission.SEND">
        <intent-filter>
            <action android:name="com.google.android.c2dm.intent.RECEIVE" />
            <category android:name="com.example.myapp" />
        </intent-filter>
        <intent-filter>
            <action android:name="com.google.android.c2dm.intent.REGISTRATION" />
            <category android:name="com.example.myapp" />
        </intent-filter>
    </receiver>
</application>

我删除了 receiver 部分并动态注册了接收器，如下所示:

public class AndroidService extends IntentService
{
    ... 
    @Override
    public int onStartCommand(Intent intent, int flags, int startId)
    {
        IntentFilter filter = new IntentFilter();
        filter.addAction("com.google.android.c2dm.intent.RECEIVE");
        filter.addAction("com.google.android.c2dm.intent.REGISTRATION");
        filter.addCategory("com.example.myapp");
        this.registerReceiver(new MyC2dmReceiver(), filter, "com.google.android.c2dm.permission.SEND", null);
        return super.onStartCommand(intent,flags,startId);
    }

    public class MyC2dmReceiver extends BroadcastReceiver
    {
        ...
    }
}