如何将清单中的意图连接到内部类？

Question

我尝试将 AUDIO_BECOME_NOISY 连接到片段中的接收器：

public class Fragment_playMedias extends Fragment  {

    ...

    public class MusicIntentReceiver extends BroadcastReceiver {

        @Override
        public void onReceive(Context context, Intent intent) {
            ...
        }
   }
}

我的清单包括：

    <receiver android:name=".Fragment_playMedias$MusicIntentReceiver" >
        <intent-filter>
            <action android:name="android.media.AUDIO_BECOMING_NOISY" />
        </intent-filter>
    </receiver>

所以，当我拔下耳机时，我会收到以下消息：

E/AndroidRuntime(848): java.lang.RuntimeException: Unable to instantiate receiver com.blah.Fragment_playMedias$MusicIntentReceiver: java.lang.InstantiationException: class com.blah.Fragment_playMedias$MusicIntentReceiver has no zero argument constructor

对于内部类来说似乎很特殊，因为如果我在自己的文件中以完全相同的方式声明 MusicIntentReceiver，就没有问题！
这可能与here 有关，但我真的不明白如何解决我的问题！

我试图插入一个空的构造函数：

    public MusicIntentReceiver() {

    }

我就是这样收到的：

E/AndroidRuntime(3047): java.lang.RuntimeException: Unable to instantiate receiver com.cabbonline.ndguide.Fragment_plyMedias$MusicIntentReceiver: java.lang.ClassNotFoundException: Didn't find class "com.cabbonline.ndguide.Fragment_plyMedias$MusicIntentReceiver" on path: DexPathList[[zip file "/data/app/com.cabbonline.ndguide-1/base.apk"],nativeLibraryDirectories=[/data/app/com.cabbonline.ndguide-1/lib/arm, /vendor/lib, /system/lib]]

怎么办？

Answer 1

变化：

public class MusicIntentReceiver extends BroadcastReceiver

到：

public static class MusicIntentReceiver extends BroadcastReceiver

否则，除了Fragment_playMedias 之外，没有人可以创建MusicIntentReceiver 的实例。