如何在应用关闭时发送通知

Question

我正在创建一个由Android推送通知组成的Android应用程序。我需要即使应用程序关闭也会运行的推送通知。我通过在服务中调用通知来实现它。但是当我在android＆gt; 5.x设备中运行代码时，我的代码运行完美，即使应用程序已关闭通知即将到来，每5秒但是当我在设备上运行应用程序＆lt; 5.x通知时显示只有当应用程序被打开或最小化时才会收到应用程序关闭时的任何通知，任何人都可以帮助我，我的错误是什么，这是我的代码

SERVICE：

package com.example.servicesandroid;


import java.util.Timer;
import java.util.TimerTask;

import com.example.servicesandroid.MainActivity.MyTimerTask;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.Uri;
import android.os.Handler;
import android.os.IBinder;
import android.support.v4.app.NotificationCompat;
import android.widget.Toast;

public class Androidservice extends Service {

    final static String ACTION = "NotifyServiceAction";
    final static String STOP_SERVICE = "";
    final static int RQS_STOP_SERVICE = 1;

    NotifyServiceReceiver notifyServiceReceiver;

    private static final int MY_NOTIFICATION_ID = 1;
    private NotificationManager notificationManager;
    private Notification myNotification;
    Timer timer;
    TimerTask timer_task;
    Handler handler;

    @Override
    public void onCreate() {
        // TODO Auto-generated method stub
        notifyServiceReceiver = new NotifyServiceReceiver();
        super.onCreate();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        MyTimerTask myTask = new MyTimerTask();
        Timer myTimer = new Timer();

        myTimer.schedule(myTask, 5000, 1500);

        // TODO Auto-generated method stub

        return  Service.START_STICKY;
    }

    @Override
    public void onDestroy() {
        // TODO Auto-generated method stub
        this.unregisterReceiver(notifyServiceReceiver);
        super.onDestroy();
    }

    @Override
    public IBinder onBind(Intent arg0) {
        // TODO Auto-generated method stub
        return null;
    }

    public class NotifyServiceReceiver extends BroadcastReceiver {

        @Override
        public void onReceive(Context arg0, Intent arg1) {
            // TODO Auto-generated method stub
            int rqs = arg1.getIntExtra("RQS", 0);
            if (rqs == RQS_STOP_SERVICE) {
                stopSelf();


            }
        }
    }
    class MyTimerTask extends TimerTask {
        public void run() {

            generateNotification(getApplicationContext(), "Hello");
        }
    }
    private void generateNotification(Context context, String message) {

        int icon = R.drawable.ic_launcher;
        long when = System.currentTimeMillis();
        String appname = context.getResources().getString(R.string.app_name);
        NotificationManager notificationManager = (NotificationManager) context
                .getSystemService(Context.NOTIFICATION_SERVICE);
        int currentapiVersion = android.os.Build.VERSION.SDK_INT;
        Notification notification;
        PendingIntent contentIntent = PendingIntent.getActivity(context, 0,
                new Intent(context, MainActivity.class), 0);

        // To support 2.3 os, we use "Notification" class and 3.0+ os will use
        // "NotificationCompat.Builder" class.
        if (currentapiVersion < android.os.Build.VERSION_CODES.HONEYCOMB) {
            notification = new Notification(icon, message, 0);
            notification.setLatestEventInfo(context, appname, message,
                    contentIntent);
            notification.flags = Notification.FLAG_AUTO_CANCEL;
            notificationManager.notify((int) when, notification);

        } else {
            NotificationCompat.Builder builder = new NotificationCompat.Builder(
                    context);
            notification = builder.setContentIntent(contentIntent)
                    .setSmallIcon(icon).setTicker(appname).setWhen(0)
                    .setAutoCancel(true).setContentTitle(appname)
                    .setContentText(message).build();

            notificationManager.notify((int) when, notification);

        }

    }

}

这是我的活动：

package com.example.servicesandroid;

import java.util.Timer;
import java.util.TimerTask;

import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.NotificationCompat;

public class MainActivity extends Activity {

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

当设备重新启动时，这是我的广播接收器：

package com.example.servicesandroid;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

public class Boot_Completed extends BroadcastReceiver {
    private final String BOOT_COMPLETED_ACTION = "android.intent.action.BOOT_COMPLETED";
    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub

        if(intent.getAction().equals(BOOT_COMPLETED_ACTION)){
               Intent myIntent = new Intent(context, Androidservice.class);
               context.startService(myIntent);

    }

}

}

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.servicesandroid"
    android:versionCode="1"
    android:versionName="1.0" >
    <uses-permission android:name="android.permission.WAKE_LOCK" />
    <uses-sdk
        android:minSdkVersion="14"
        android:targetSdkVersion="18" />

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

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <service android:name=".Androidservice"/>
        <receiver android:name=".Boot_Completed" android:label="@string/app_name">
            <intent-filter>
    <action android:name="android.intent.action.BOOT_COMPLETED" />
   </intent-filter>
  </receiver>
    </application>

</manifest>

请任何人帮助我