IntentService 中未收到广播接收器

Question

我正在构建一个能够从 FirebaseMessagingService 捕获意图的服务。

我使用的第一个版本在主要活动的应用程序级别执行此操作，但我不想再在此级别处理它。我创建了如下意图服务：

package com.seb.sebastien.appservices;

import android.app.IntentService;
import android.content.BroadcastReceiver;
import android.content.Intent;
import android.content.Context;
import android.content.IntentFilter;
import android.telephony.TelephonyManager;
import android.util.Log;

public class appsControlIntentService extends IntentService {
    public static final String REQUEST_MSG = "request";
    public static final String RESPONSE_MSG = "response";
    public static final String TAG = "appsControlIntentService";
    private String type_sim;


    public appsControlIntentService() {
        super("appsControlIntentService");
    }

    @Override
    protected void onHandleIntent(Intent intent) {

        boolean request = intent.getBooleanExtra(REQUEST_MSG, false);

        if(request == true) {
            sendResponse("Enable");
            handleAction(getCarrier());
            registerAllReceivers();
        }
        else if (request == false) {
            sendResponse("Disable");
            unRegisterAllReceivers();
            disableAction();
        }
        else
            Log.e(TAG, "Error msg");

    }
    ...

    /* Firebase and SIM */
    private BroadcastReceiver serviceBroadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            Log.d(TAG, "Broadcast received");
            if (intent.getExtras().getString(appFirebaseMessagingService.FIREBASE).equals(appFirebaseMessagingService.FIREBASE))
                type_sim = intent.getExtras().getString(appFirebaseMessagingService.SIM_TYPE);
            else if(intent.getExtras().getString(SimNotificationService.EXTRA_SIM_STATE) != null)
                Log.d(TAG, "Get something from Sim");
            else
                type_sim = null;

            if(type_sim != null){
                handleAction(type_sim);
            }
        }
    };

    private void registerAllReceivers(){
        Log.d(TAG, "Broadcast receiver register");
        registerReceiver(serviceBroadcastReceiver, new IntentFilter(appFirebaseMessagingService.INTENT_FILTER));
    }

    private void unRegisterAllReceivers() {
        if (serviceBroadcastReceiver != null) {
            unregisterReceiver(serviceBroadcastReceiver);
            serviceBroadcastReceiver = null;
        }
    }

    @Override
    public void onDestroy() {
        unRegisterAllReceivers();
        super.onDestroy();
    }

}

此意图服务注册一个广播接收器，以便能够接收 firebase 广播，如下所示：

package com.seb.sebastien.appservices;

public class appFirebaseMessagingService extends FirebaseMessagingService {

    public static final String TAG = "appFirebaseMessagingService";
    public static final String INTENT_FILTER = "INTENT_FILTER";
    public static final String FIREBASE = "firebase";
    public static final String SIM_TYPE = "simtype";

    public appFirebaseMessagingService() {
    }

   /* @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        throw new UnsupportedOperationException("Not yet implemented");
    } */

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {

        String sim = null;

        Log.d(TAG, "From: " + remoteMessage.getFrom());

        if (remoteMessage.getData().size() > 0) {
            Log.d(TAG, "Message data payload: " + remoteMessage.getData());
        }

        // Check if message contains a notification payload.
        if (remoteMessage.getNotification() != null) {
            sim = remoteMessage.getNotification().getBody();
            Log.d(TAG, "Message Notification Body: " + remoteMessage.getNotification().getBody());
        }

        Intent intent = new Intent(INTENT_FILTER);
        intent.putExtra(FIREBASE, FIREBASE);
        intent.putExtra(SIM_TYPE, sim );

        sendBroadcast(intent);

    }
}

调试时，我看到我们一直到 sendBroadcast，但如果我注册了接收器，“appControlIntentService”类事件中似乎没有收到任何内容。

知道为什么在意图服务中没有收到广播吗？

Answer 1

首先，不确定您实际在哪里创建了 appsControlIntentService 的实例。

其次，当onHandleIntent 完成时，IntentService 会停止。它旨在完成一项简短的任务并完成。所以基本上即使你创建了一个来收听广播，它也只会在非常有限的时间内这样做，直到它的 onDestroy 被调用。

关于用于监听您的自定义意图的 BroadcastReceiver 解决方案：

1) 创建一个在后台运行的服务（不是 IntentService，常规服务），并让它注册一个 BroadcastListener。您可以在您的活动第一次唤醒时创建此服务，并且可能在 Boot BroadcastReceiver 中。确定您希望它是前台服务还是后台服务。由于内存问题，后台服务更有可能被操作系统杀死。但前台服务要求您在状态栏中显示一个图标。

2) 只需将 BroadcastReceiver 放入清单中。这样，操作系统甚至会在广播到达时唤醒应用程序来处理广播。即使应用程序当前未运行。 在https://developer.android.com/guide/components/broadcasts.html 中查看“清单声明的接收者”。

要禁用此接收器，请查看：Android - how to unregister a receiver created in the manifest?。或者，您可以保存在共享首选项中，无论您是否希望它对事件执行某些操作，或者更好的是，如果 FirebaseMessagingService 首先被禁用，则不要从它发送意图。

Answer 2

你应该像这样对广播接收器使用警报管理器 -

AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);

        Intent alarmIntent = new Intent(MainActivity.this, BroadCastReciever.class);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 1,
                alarmIntent, 0);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()
                    + duration(in millisecond), pendingIntent);
        } else {
            alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()
                    + in millisecond, pendingIntent);

        }