带有监听器的 Android Broadcastreceiver

Question

我有一个用于监控网络状态的 Broadcastreceiver。当它发生变化时，我想向我的 BaseActivity 发送自定义异常，以便可以在任何 Activity 中显示。

为了发送异常，我有一个监听器，它是在我的 BaseActivity 上实现的。

广播接收者:

public class ConnectionStateReceiver extends BroadcastReceiver {
    private ConnectionStateListener connectionStateListener;

    public void onReceive(Context context, Intent intent) {
        this.connectionStateListener = (ConnectionStateListener) context;

        if (this.connectionStateListener != null) {
            this.connectionStateListener.showConnectionStateLostException(new NetworkConnectionException());
        }
        ......

听众:

public interface ConnectionStateListener {
    void showConnectionStateLostException(Exception exception);
}

基础 Activity :

public abstract class BaseActivity extends ActionBarActivity implements ConnectionStateListener, BatteryChangeListener {

...

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    this.ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
    this.batteryStatus = this.registerReceiver(null, ifilter);
    //Receiver called when battery level changes
    this.systemBatteryLevelReceiver = new BatteryChangeReceiver();

    registerReceiver(systemBatteryLevelReceiver, ifilter);

}

...
@Override
public void showConnectionStateLostException(Exception exception) {
    showSystemStateMessage(ExceptionMessageUtils.createSystemExceptionMessage(this, exception));
}

@Override
public void showChangeBatteryException(Exception exception) {
    showSystemStateMessage(ExceptionMessageUtils.createSystemExceptionMessage(this, exception));
}
...

list :

...
<receiver android:name=".data.broadcastreceivers.ConnectionStateReceiver"
        android:enabled="false">
        <intent-filter>
            <action android:name="android.net.conn.CONNECTIVITY_CHANGE"/>
        </intent-filter>
    </receiver>

问题是当它试图在接收器上进行转换时:

this.connectionStateListener = (ConnectionStateListener) context;

它给我以下错误:

01-14 11:45:38.347    8766-8766/com.massfactory.mobile.android.stlparatransit E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.massfactory.mobile.android.stlparatransit, PID: 8766
java.lang.RuntimeException: Unable to start receiver com.massfactory.mobile.android.stlparatransit.data.broadcastreceivers.ConnectionStateReceiver: java.lang.ClassCastException: android.app.ReceiverRestrictedContext cannot be cast to com.massfactory.mobile.android.stlparatransit.domain.broadcastlisteners.ConnectionStateListener at android.app.ActivityThread.handleReceiver(ActivityThread.java:2593) at android.app.ActivityThread.access$1700(ActivityThread.java:148)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1360)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:135)
        at android.app.ActivityThread.main(ActivityThread.java:5274)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
 Caused by: java.lang.ClassCastException: android.app.ReceiverRestrictedContext cannot be cast to com.massfactory.mobile.android.stlparatransit.domain.broadcastlisteners.ConnectionStateListener
        at com.massfactory.mobile.android.stlparatransit.data.broadcastreceivers.ConnectionStateReceiver.onReceive(ConnectionStateReceiver.java:37)
        at android.app.ActivityThread.handleReceiver(ActivityThread.java:2586)
        at android.app.ActivityThread.access$1700(ActivityThread.java:148)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1360)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:135)
        at android.app.ActivityThread.main(ActivityThread.java:5274)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at  com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

我有另一个广播，它使用相同的“结构”监视电池状态并且没有给出任何问题，唯一的区别是“电池广播”是动态声明的(不像这个在 list 中)。

电池监听器:

public interface BatteryChangeListener {
   void showChangeBatteryException(Exception exception);
}

知道为什么会发生这种情况以及我应该如何解决它吗？

提前致谢

Answer 1

解决方案是将 ConnectionStateReceiver 注册到 Activity 中，并按照 EagleEye 的评论将其从 list 中删除。

public abstract class BaseActivity extends ActionBarActivity implements ConnectionStateListener, BatteryChangeListener {

...

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    this.ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
    this.batteryStatus = this.registerReceiver(null, ifilter);
    //Receiver called when battery level changes
    this.systemBatteryLevelReceiver = new BatteryChangeReceiver();

    registerReceiver(systemBatteryLevelReceiver, ifilter);


     //Check Network State
     this.iFilterConnectionState = new IntentFilter();             this.iFilterConnectionState.addAction(android.net.ConnectivityManager.CONNECTIVITY_ACTION);        
     this.systemConnectionStateReceiver = new ConnectionStateReceiver();        
     registerReceiver(this.systemConnectionStateReceiver, iFilterConnectionState);

}