getExtra from Intent 从pendingIntent 启动 [英] getExtra from Intent launched from a pendingIntent

问题描述

在用户从列表中选择带有时间的内容并在给定时间为其创建通知后，我尝试发出一些警报.我的问题是广播接收器无法接收到我 Intent 上的 putExtra 的showname".它总是得到空值.这是我为大多数意图所做的方式，但我认为这次可能是因为 pendingIntent 或 broadcastReceiver 需要以不同的方式完成某些事情.谢谢

I am trying to make some alarms after the user selects something with a time from a list and create a notification for it at the given time. My problem is that the "showname" that a putExtra on my Intent cant be received at the broadcast receiver. It always get null value. This is the way I do it for most of my intents but I think this time maybe because of the pendingIntent or the broadcastReceiver something need to be done differentelly. Thank you

通过pending Intent发送Intent的函数

The function that sends the Intent through the pending intent

public void setAlarm(String showname,String time) {

    String[] hourminute=time.split(":");
    String hour = hourminute[0];
    String minute = hourminute[1];
    Calendar rightNow = Calendar.getInstance();
    rightNow.set(Calendar.HOUR_OF_DAY, Integer.parseInt(hour));
    rightNow.set(Calendar.MINUTE, Integer.parseInt(minute));
    rightNow.set(Calendar.SECOND, 0);
    long t=rightNow.getTimeInMillis();
    long t1=System.currentTimeMillis();

    try {   

    Intent intent = new Intent(this, alarmreceiver.class);  
    Bundle c = new Bundle();            
    c.putString("showname", showname);//This is the value I want to pass
    intent.putExtras(c);
    PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 12345, intent, 0);

    AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
    alarmManager.set(AlarmManager.RTC_WAKEUP, rightNow.getTimeInMillis(),pendingIntent);
    //Log.e("ALARM", "time of millis: "+System.currentTimeMillis());
    Toast.makeText(this, "Alarm set", Toast.LENGTH_LONG).show();

    } catch (Exception e) {
        Log.e("ALARM", "ERROR IN CODE:"+e.toString());
    }
}

这是接收端

public class alarmreceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
    // Toast.makeText(context, "Alarm worked.", Toast.LENGTH_LONG).show();      
    Bundle b = intent.getExtras();
    String showname=b.getString("showname");//This is where I suppose to receive it but its null
    NotificationManager manger = (NotificationManager) context
            .getSystemService(context.NOTIFICATION_SERVICE);

    Notification notification = new Notification(R.drawable.icon,
            "TVGuide Υπενθύμιση", System.currentTimeMillis());
    PendingIntent contentIntent = PendingIntent.getActivity(context, 0,
            new Intent(context, tvguide.class), 0);

    notification.setLatestEventInfo(context, "Το Πρόγραμμα Ξεκίνησε",
            showname, contentIntent);

    notification.flags = Notification.FLAG_ONLY_ALERT_ONCE;

    notification.sound = Uri.parse("file:///sdcard/dominating.mp3");
    notification.vibrate = new long[]{100, 250, 100, 500};
    manger.notify(1, notification);
}           
}

推荐答案

如果您在 Intent 中更改了 Extra 的值，那么在创建待定 Intent 时您应该使用标志 PendingIntent.FLAG_CANCEL_CURRENT.

If you change the Extra's value in the intent, then while creating the pending intent you should use the flag PendingIntent.FLAG_CANCEL_CURRENT.

一个简单的例子是

PendingIntent pi = PendingIntent.getBroadcast(context, 0,intentWithNewExtras,PendingIntent.FLAG_CANCEL_CURRENT);

这是正确的方式，将确保您的新价值得以实现.

This is the right way and will ensure that your new values are delivered.

希望有帮助.

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