Question

我正在使用Android和广播接收器进行警报。设置并播放闹钟可以，但是我无法关闭闹钟。我有两个用于设置警报和停止警报的按钮。我的代码在这里；

public class MainActivity extends AppCompatActivity {
Button btn;

private Button startAlarmBtn;
private TimePickerDialog timePickerDialog;
final static int REQUEST_CODE = 1;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
     Button cancel;



            startAlarmBtn = (Button) findViewById(R.id.startAlarmBtn);
            startAlarmBtn.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    openPickerDialog(false);
                }
            });


    cancel=(Button)findViewById(R.id.cancel);
    cancel.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            stopAlarm();
        }
    });
}
private void openPickerDialog(boolean is24hour) {

    Calendar calendar = Calendar.getInstance();

    timePickerDialog = new TimePickerDialog(
            MainActivity.this,
            onTimeSetListener,
            calendar.get(Calendar.HOUR_OF_DAY),
            calendar.get(Calendar.MINUTE),
            is24hour);
    timePickerDialog.setTitle("Alarm Ayarla");

    timePickerDialog.show();
}

TimePickerDialog.OnTimeSetListener onTimeSetListener
        = new TimePickerDialog.OnTimeSetListener(){

    @Override
    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {

        Calendar calNow = Calendar.getInstance();
        Calendar calSet = (Calendar) calNow.clone();

        calSet.set(Calendar.HOUR_OF_DAY, hourOfDay);
        calSet.set(Calendar.MINUTE, minute);
        calSet.set(Calendar.SECOND, 0);
        calSet.set(Calendar.MILLISECOND, 0);

        if(calSet.compareTo(calNow) <= 0){

            calSet.add(Calendar.DATE, 1);
        }

        setAlarm(calSet);
    }};

private void setAlarm(Calendar alarmCalender){

    Toast.makeText(getApplicationContext(),"Alarm OK!",Toast.LENGTH_SHORT).show();
    Intent intent = new Intent(getBaseContext(), AlarmReceiver.class);
    PendingIntent pendingIntent = PendingIntent.getBroadcast(getBaseContext(), REQUEST_CODE, intent, 0);
    AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
    alarmManager.set(AlarmManager.RTC_WAKEUP, alarmCalender.getTimeInMillis(), pendingIntent);

}
private void stopAlarm(){

    PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), REQUEST_CODE,
            new Intent(getApplicationContext(), AlarmReceiver.class), PendingIntent.FLAG_UPDATE_CURRENT);

    AlarmManager manager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
    pendingIntent.cancel();


}
}


public class AlarmReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {

    Uri alarmUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM);
    if (alarmUri == null)
    {
        alarmUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
    }
    Ringtone ringtone = RingtoneManager.getRingtone(context, alarmUri);
    ringtone.play();
}


}

如何关闭闹钟？
我的另一个问题是，将它们放在主线程中是否合适？
我应该使用AsyncTask还是多线程？

谢谢。

Answer 1

警报没有停止，因为您没有正在播放的铃声实例的句柄。我建议您添加一个计时器来自动停止铃声，或者创建一个全局的铃声实例，这可能是个坏主意，因为如果您忘记清理，它可能会泄漏并导致其他问题。

计时的简单方法如下所示：

public class AlarmReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {

    Uri alarmUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM);
    if (alarmUri == null)
    {
        alarmUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
    }
    Ringtone ringtone = RingtoneManager.getRingtone(context, alarmUri);
    ringtone.play();

new CountDownTimer(30000, 1000) { // a timer for 30 seconds, that updates approximately every second
 public void onTick(long millisUntilFinished) {
  }
  public void onFinish() {
// stop your ringtone here, or do other necessary stuff here
// you might want to check if the ringtone was not stopped before this method
 }
}.start();
}
}

对于第二个问题，您也可以使用带有处理程序或可运行程序的线程来相应地管理铃声。对于一个相对简单的东西，AsyncTask可能工作太多。

警报不停止

1 个答案: