如何使用AlarmManager等启动活动

时间:2012-08-27 16:16:50

标签: android alarmmanager

我正在尝试使用Alarm manager定期在活动中启动代码。我在这里看过各种各样的例子,但他们并没有真正帮助过。

出于测试目的,我要做的就是以10秒的间隔弹出一个吐司,但似乎根本没有发生任何事情。请帮帮我们!

我在清单中有这个(也是所有三个活动的声明):

<receiver android:name=".receiver.AlarmReceiver"></receiver> 

主要活动的代码,在OnCreate中:

        //
        // Setting up the Alarm Manager
        //
        Intent myIntent = new Intent(getBaseContext(), AlarmReceiver.class); 
        PendingIntent pendingIntent = PendingIntent.getBroadcast(getBaseContext(), 0,         myIntent, 0); 
        AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE); 
        Calendar calendar = Calendar.getInstance(); 
        calendar.setTimeInMillis(System.currentTimeMillis()); 
        calendar.add(Calendar.SECOND, 10); 
        long timerInterval = 10 * 1000;  
        alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), timerInterval, pendingIntent); 
        //finish();  

AlarmReceiver.java:

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

public class AlarmReceiver extends BroadcastReceiver 
{

public void onReceive(Context context, Intent intent) 
    { 
    Toast.makeText(context," onRecieve() test" , Toast.LENGTH_LONG).show(); 
    Intent scheduledIntent = new Intent(context, MyService.class); 
    scheduledIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
    context.startActivity(scheduledIntent);
    } 
}

MyService.java:

import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.IBinder;
import android.widget.Toast;

public class MyService extends Service {


public void onCreate(Bundle savedInstanceState) {
     super.onCreate();


 Toast.makeText(getBaseContext(),"test message.",
            Toast.LENGTH_SHORT).show();

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

}

2 个答案:

答案 0 :(得分:0)

您的活动未展示,因为您在标有startActivity()的{​​{1}}上致电Intent。您应该在LogCat中看到与此相关的警告。

我谦卑地建议您通过Service类自己使用LogCat来记录后台操作,而不是尝试使用Log

答案 1 :(得分:0)

测试此代码:

private void establecerAlarmaClick(int when){
AlarmManager manager = (AlarmManager) this.getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(MainActivityAlarmita.this, MainActivityAlarmita.class);
PendingIntent pendingIntent = PendingIntent.getActivity(MainActivityAlarmita.this, 0, intent, PendingIntent.FLAG_ONE_SHOT);
((AlarmManager) getSystemService(ALARM_SERVICE)).set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + when * 1000, pendingIntent);
}