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[英]Android - Unable to receive local broadcast in my activity from service
[英]Unable to receive broadcast from Service
我遇到的问题是关于从android库项目中的服务接收广播的。
为什么我无法接收广播? 它与所有服务/接口逻辑在单独的android库项目中有关吗?
这是该服务的广播
broadcastReceivedMessage("THE TOPIC", "THE MESSAGE");
这是服务内的方法
private void broadcastReceivedMessage(final String topic, final String message) {
/* handler.post(new Runnable() {
@Override
public void run() {*/
Intent broadcastIntent = new Intent(CALLBACK_ACTION);
broadcastIntent.setAction(ON_MESSAGE_RECEIVED);
broadcastIntent.putExtra(TOPIC_STR, topic);
broadcastIntent.putExtra(MESSAGE_STR, message);
sendBroadcast(broadcastIntent);
/* }
});*/
}
在实现许多接口的类中,这是我注册以侦听特定意图过滤器的地方。
@Override
public void connect(String address, int port) {
IntentFilter filter = new IntentFilter(MQTTService2.CALLBACK_ACTION);
LocalBroadcastManager.getInstance(getContext()).registerReceiver(serviceActionReceiver, filter);
Bundle args = new Bundle();
args.putString(MQTTService2.BROKER_ADDR_STR, address);
args.putInt(MQTTService2.BROKER_PORT_INT, port);
startService(MQTTService2.ACTION_CONNECT, args);
}
在一个Activity中,我希望从接口接收回调并进行广播
MQTTEventHandler mHandler = new MQTTEventHandler() {
@Override
public void onStatusChanged(CommunicatorStatus status, String message) {
// TODO Auto-generated method stub
Log.e("onStatusChanged", "----------------Status Changed------------");
Log.e("STATUS: ", status.toString());
Log.e("MESSAGE: ", message);
Log.e("onStatusChanged", "--------------------------------------------");
}
@Override
public void onMessageReceived(String topic, String message) {
// TODO Auto-generated method stub
Log.e("onMessageReceived", "----------------Message Received------------");
Log.e("TOPIC: ", topic);
Log.e("MESSAGE: ", message);
Log.e("onMessageReceived", "--------------------------------------------");
}
@Override
public void onException(String message) {
// TODO Auto-generated method stub
}
};
mComm.addEventHandler(mHandler);
广播接收器
class ServiceActionReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action.equals(MQTTService2.ON_EXCEPTION)) {
Bundle extras = intent.getExtras();
if (extras != null && extras.containsKey(MQTTService2.MESSAGE_STR))
fireOnException(extras.getString(MQTTService2.MESSAGE_STR));
} else if (action.equals(MQTTService2.ON_MESSAGE_RECEIVED)) {
Bundle extras = intent.getExtras();
if (extras != null && extras.containsKey(MQTTService2.MESSAGE_STR)
&& extras.containsKey(MQTTService2.TOPIC_STR))
fireOnMessageReceived(extras.getString(MQTTService2.TOPIC_STR),
extras.getString(MQTTService2.MESSAGE_STR));
} else if (action.equals(MQTTService2.ON_STATUS_CHANGED)) {
Bundle extras = intent.getExtras();
if (extras.containsKey(MQTTService2.STATUS_CODE)) {
MQTTService2.MQTTConnectionStatus status =
MQTTConnectionStatus.parseCode(extras.getString(MQTTService2.STATUS_CODE));
switch (status) {
case CONNECTED:
fireOnStatusChanged(CommunicatorStatus.DISCONNECTED,
extras.getString(MQTTService2.MESSAGE_STR, ""));
break;
case CONNECTING:
break;
case INITIAL:
break;
case NOTCONNECTED_DATADISABLED:
case NOTCONNECTED_UNKNOWNREASON:
case NOTCONNECTED_USERDISCONNECT:
case NOTCONNECTED_WAITINGFORINTERNET:
fireOnStatusChanged(CommunicatorStatus.DISCONNECTED,
extras.getString(MQTTService2.MESSAGE_STR, ""));
break;
default:
break;
}
}
}
}
}
根据特定的意图过滤器(onMessageReceived)调用的方法
private void fireOnMessageReceived(String topic, String message) {
for (MQTTEventHandler eventHandler : handlers) {
eventHandler.onMessageReceived(topic, message);
}
/* for (Iterator<MQTTEventHandler> it = handlers.iterator(); it.hasNext();) {
it.next().onMessageReceived(topic, message);
}*/
}
似乎以下原因导致从您的服务中广播的Intent与BroadcastReceiver上设置的IntentFilter不匹配。
Intent broadcastIntent = new Intent(CALLBACK_ACTION);
broadcastIntent.setAction(ON_MESSAGE_RECEIVED);
为CALLBACK_ACTION
设置了IntentFilter,并使用相同的操作实例化了该Intent,但是上面的第二行将Intent的操作重置为ON_MESSAGE_RECEIVED
,导致它不再与BroadcastReceiver上的Filter匹配。
一种可能的解决方案是将多个动作添加到IntentFilter,并在Receiver的onReceive()
方法中检查已传递的动作,以确定如何处理广播。
例如:
IntentFilter filter = new IntentFilter(MQTTService2.ACTION_MESSAGE_RECEIVED);
filter.addAction(MQTTService2.ACTION_OTHER);
然后,在onReceive()
方法中:
@Override
public void onReceive(Context context, Intent intent)
{
String action = intent.getAction();
if(action.equals(ACTION_MESSAGE_RECEIVED)) {
...
}
else if(action.equals(ACTION_OTHER)) {
...
}
...
}
然后,您将使用所需的操作实例化广播Intent,并随后删除setAction()
调用:
Intent broadcastIntent = new Intent(MQTTService2.ACTION_MESSAGE_RECEIVED);
...
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