我制作了一个应用程序，其中有一个数字选择器，范围从1到60分钟，我将它连接到重复的警报管理器。当我试一试时，我注意到它有时不准确，要么需要更长的时间才能工作或更少。
可能是什么问题？
对于开始按钮：
startB.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (startB.isChecked())
{
Calendar calSet = Calendar.getInstance();
calSet.set(Calendar.MINUTE, picker2.getValue());
calSet.set(Calendar.SECOND, 0);
calSet.set(Calendar.MILLISECOND, 0);
setAlarm(calSet);
SharedPreferences.Editor editor = getPreferences(MODE_PRIVATE).edit();
editor.putBoolean("toggleButton", startB.isChecked());
editor.commit();
timerHasStarted = true;
}
else
{
Intent intent = new Intent(getBaseContext(), MainReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(getBaseContext(), RQS_1, intent, 0);
AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
alarmManager.cancel(pendingIntent);
SharedPreferences.Editor editor = getPreferences(MODE_PRIVATE).edit();
editor.putBoolean("toggleButton", startB.isChecked());
editor.commit();
timerHasStarted = false;
}
}
});
警报：
private void setAlarm(Calendar targetCal ) {
// TODO Auto-generated method stub
Intent intent = new Intent(getBaseContext(), MainReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(getBaseContext(), RQS_1, intent, 0);
AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,
targetCal.getTimeInMillis(),
TimeUnit.MINUTES.toMillis(picker2.getValue()),
pendingIntent);
}
接收器：
@Override
public void onReceive(Context context, Intent intent) {
MediaPlayer m=MediaPlayer.create(context, R.raw.sound);
m.start();
}