Question

我正在尝试在固定时间向用户显示通知。我正在使用BroadcastReceiver来显示通知。问题是，BroadcastReceiver仅在应用程序在前台或后台运行时调用。但是当我关闭应用程序时，BroadcastReceiver没有被调用（意味着杀死应用程序）。我使用AlarmManager来致电BroadcastReceiver。

我在stackoverflow上的某处读到，我们不打算专门为调用BroadcastReceiver提供服务。我们只需要在AndroidManifest注册它。

我正在使用Xiomi Redmi 3s prime设备，android版本是6.0.1。

那么我错过了什么？为什么BroadcastReceiver没有被调用？

这是我触发AlarmManager

的课程

public class Settings extends Fragment {

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.settings,container,false);


        Intent intent = new Intent(getActivity(), BroadcastReciever.class);

        AlarmManager alarmManager = (AlarmManager)getActivity().getSystemService(Service.ALARM_SERVICE);

        PendingIntent pendingIntent = PendingIntent.getBroadcast(getActivity(),1,intent,PendingIntent.FLAG_UPDATE_CURRENT);

        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.HOUR_OF_DAY, 15);
        calendar.set(Calendar.MINUTE, 27);
        calendar.set(Calendar.SECOND, 00);

        alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,calendar.getTimeInMillis(),AlarmManager.INTERVAL_DAY,pendingIntent);

        return view;
    }
}

这是我的BroadcastReceiver

public class BroadcastReciever extends BroadcastReceiver {

    Uri alarmSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);

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


        Intent nofificationIntent = new Intent(context, Home.class);
        nofificationIntent.putExtra("notify_key","notify_value");

        PendingIntent resultPendingIntent =
                PendingIntent.getActivity(
                        context,1,
                        nofificationIntent,
                        PendingIntent.FLAG_UPDATE_CURRENT
                );

        NotificationCompat.Builder mBuilder =
                new NotificationCompat.Builder(context)
                        .setSmallIcon(R.drawable.donate)
                        .setSound(alarmSound)
                        .setContentIntent(resultPendingIntent)
                        .setContentTitle("Whats up")
                        .setContentText("Hello world");

        int mNotificationId = 001;

        NotificationManager mNotifyMgr =
                (NotificationManager) context.getSystemService(NOTIFICATION_SERVICE);
        mNotifyMgr.notify(mNotificationId, mBuilder.build());

    }
}

这是我的清单

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.user.nf">

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_CALENDAR"/>
    <uses-permission android:name="android.permission.WRITE_CALENDAR"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".Splash">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <activity android:name=".Home"
            android:windowSoftInputMode="stateHidden"
            android:screenOrientation="portrait"/>

        <activity android:name=".AndroidDatabaseManager"
            android:theme="@style/Theme.AppCompat.Light"/>

        <receiver android:name="broadcast.BroadcastReciever"
            android:enabled="true">
        <intent-filter>
            <action android:name="android.intent.action.NOTIFY" />
        </intent-filter>
        </receiver>

    </application>

</manifest>

Answer 1

使用WakefulBroadcastReceiver代替

帮助实现接收设备唤醒事件的BroadcastReceiver的通用模式，然后将工作传递给Service，同时确保设备在转换期间不会重新进入休眠状态

该课程负责为您创建和管理部分唤醒锁;您必须请求WAKE_LOCK权限才能使用它。

请参阅此处的documentation

希望它有所帮助!!

Answer 2

在活动中： -

@Override
protected void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    startService(new Intent(MainActivity.this,MyFirstService.class));
}

在服务中： -

公共类MyFirstService扩展了Service {

@Nullable
@Override
public IBinder onBind(Intent intent) 
{
    return null;
}

@Override
public void onCreate() 
{
    super.onCreate();
    Notification note = new Notification(0,null,System.currentTimeMillis());
    note.flags |= Notification.FLAG_NO_CLEAR;
    startForeground(42, note);
    stopService(new Intent(this, MyService.class));
    stopForeground(true);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) 
{
    return   START_STICKY;
}

}

在广播中： -

广播在创建serivce之后编写代码。

关闭我的应用程序后未调用BroadcastReceiver

2 个答案: