为什么noftifications出现在android通知栏中一段时间​​然后消失

概述我正在使用BroadCastReceiver,其中接收BOOT_COMPLETED *** 作.收到此广播后,会设置AlarmManager,此AlarmManager会触发通知： 广播接收器的代码： package pit.opensource.events;import java.util.Calendar;import android.app.AlarmManager;import and 我正在使用broadCastReceiver,其中接收BOOT_COMPLETED *** 作.收到此广播后,会设置AlarmManager,此AlarmManager会触发通知：
广播接收器的代码：

package pit.opensource.events;import java.util.Calendar;import androID.app.AlarmManager;import androID.app.PendingIntent;import androID.app.Service;import androID.content.broadcastReceiver;import androID.content.Context;import androID.content.Intent;import androID.util.Log;public class BootReciver extends broadcastReceiver {    Context c;    @OverrIDe    public voID onReceive(Context context,Intent intent) {        // Todo auto-generated method stub    //  Intent i = new Intent(context,SetAlarmService.class);    //  context.startService(i);        setAlarm(context);        Log.d("Alarm","Boot Reciver");    }    private voID setAlarm(Context c){        Log.d("Alarm","Set alarm service--------------");        AlarmManager alarm = (AlarmManager)c.getSystemService(Service.ALARM_SERVICE);        Calendar cal = Calendar.getInstance();        cal.setTimeInMillis(System.currentTimeMillis());        cal.clear();        cal.set(2012,5,11,11);        Intent i = new Intent(c,ShowNotificationService.class);        PendingIntent pendingIntent = PendingIntent.getService(c,12345,i,0);        //  alarm.set(AlarmManager.RTC_WAKEUP,dateNotif.getTime(),pendingIntent);        //alarm.set(AlarmManager.RTC_WAKEUP,cal.getTimeInMillis(),pendingIntent);        alarm.set(AlarmManager.RTC_WAKEUP,5000,pendingIntent);        Log.d("Alarm","Alarm is alreday set*****************");    }}

ShowNotificationService的代码：

package pit.opensource.events;import androID.app.Notification;import androID.app.notificationmanager;import androID.app.PendingIntent;import androID.app.Service;import androID.content.Intent;import androID.os.IBinder;import androID.util.Log;import androID.Widget.Toast;public class ShowNotificationService extends Service {    @OverrIDe    public IBinder onBind(Intent intent) {        // Todo auto-generated method stub        return null;    }    @OverrIDe    public voID onStart(Intent intent,int startID){        Toast.makeText(getApplicationContext(),"Alaraaaaaaaam",Toast.LENGTH_LONG).show();        Log.d("Alarm","Notification Service");        showNotification();    }    private voID showNotification(){        Intent i = new Intent(getApplicationContext(),DetailsActivity.class);        Toast.makeText(getApplicationContext(),"Dowanlod finished!",Toast.LENGTH_LONG).show();        int notificationID = 1;        notificationmanager nm = (notificationmanager) getSystemService(getApplicationContext().NOTIFICATION_SERVICE);        Log.d("Notification","Notification is set--------------------");        PendingIntent contentIntent = PendingIntent.getActivity(getApplicationContext(),0);        CharSequence tickerText = "Alaraaaaaaaam!";        long when = System.currentTimeMillis();        int icon = R.drawable.ic_launcher;        Notification notification = new Notification(icon,tickerText,when);        CharSequence contentTitle = "Alarm Alarm Alarm Alarm !!";        CharSequence contentText = "Please click here to display more details";        notification.setLatestEventInfo(getApplicationContext(),contentTitle,contentText,contentIntent);        //---100ms delay,vibrate for 250ms,pause for 100 ms and        // then vibrate for 500ms---        notification.vibrate = new long[] { 100,250,100,500}; // Needs vibrate permissions        nm.notify(notificationID,notification);    }}

解决方法 通知消失了,因为在broadcastReceiver完成后,您的应用程序不再处于活动状态.并且会自动删除来自非活动应用程序的通知. 总结

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