如何在android studio上设置闹钟？

Question

我真的需要帮助的人，我试图让敬酒出现在特定的时间与来自android的报警管理器。我做了一些研究，我做了这个代码，但我不知道什么是不正常......我什么都试过

public void start() { 
     AlarmManager manager = (AlarmManager) getSystemService(Context.ALARM_SERVICE); 
     Date dat = new Date(); 
     Calendar cal_alarm = Calendar.getInstance(); 
     Calendar cal_now = Calendar.getInstance(); 
     cal_now.setTime(dat); 
     cal_alarm.setTime(dat); 
     cal_alarm.set(Calendar.HOUR_OF_DAY,12); 
     cal_alarm.set(Calendar.MINUTE,13); 
     cal_alarm.set(Calendar.SECOND,0); 
     if(cal_alarm.before(cal_now)){ 
      cal_alarm.add(Calendar.DATE,1); 
     } 
     manager.set(AlarmManager.RTC_WAKEUP,cal_alarm.getTimeInMillis(),pendingIntent); 
    } 

如果我使用cal_alarm - 在manager.set cal_now这5秒后关闭触发。

Answer 1

您需要添加一个接收器得到的结果

在你AndroidManifest.xml中添加此

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

创建这个广播接收器AlarmReceiver.java

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

public class AlarmReceiver extends BroadcastReceiver { 

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

     Toast.makeText(context, "ALARM", Toast.LENGTH_LONG).show(); 
    } 
} 

和最后，修复你的方法开始

public void start() { 
    AlarmManager manager = (AlarmManager) getSystemService(Context.ALARM_SERVICE); 
    Date dat = new Date(); 
    Calendar cal_alarm = Calendar.getInstance(); 
    Calendar cal_now = Calendar.getInstance(); 
    cal_now.setTime(dat); 
    cal_alarm.setTime(dat); 
    cal_alarm.set(Calendar.HOUR_OF_DAY,14); 
    cal_alarm.set(Calendar.MINUTE,18); 
    cal_alarm.set(Calendar.SECOND,0); 
    if(cal_alarm.before(cal_now)){ 
     cal_alarm.add(Calendar.DATE,1); 
    } 

    Intent myIntent = new Intent(context, AlarmReceiver.class); 
    pendingIntent = PendingIntent.getBroadcast(context, 0, myIntent, 0); 

    manager.set(AlarmManager.RTC_WAKEUP,cal_alarm.getTimeInMillis(), pendingIntent); 
}