Android 立即触发警报

Question

public class setAlarm extends AppCompatActivity {

final Calendar setat = Calendar.getInstance();
Calendar[] calendar = new Calendar[8];

public void dimensions(){
    DisplayMetrics dm = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(dm);

    int width = dm.widthPixels;
    int height = dm.heightPixels;

    getWindow().setLayout((int) (width * 0.62), (int) (height * 0.4));
}

public void clock(){
    final TextView ora = (TextView)findViewById(R.id.clock);
    findViewById(R.id.clock).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            final Calendar time = Calendar.getInstance();
            int hour = time.get(Calendar.HOUR_OF_DAY);
            int minute = time.get(Calendar.MINUTE);

            TimePickerDialog timePickerDialog;
            timePickerDialog = new TimePickerDialog(setAlarm.this, new TimePickerDialog.OnTimeSetListener(){
                @Override
                public void onTimeSet(TimePicker timePicker, int selectedHour, int selectedMinute){
                    ora.setText(selectedHour + ":" + selectedMinute);
                    setat.set(Calendar.HOUR_OF_DAY, selectedHour);
                    setat.set(Calendar.MINUTE, selectedMinute);
                }
            }, hour, minute, true);
            timePickerDialog.setTitle("Select Time");
            timePickerDialog.show();
        }
    });
}

public void alarm(){
    clock();
    findViewById(R.id.confirm).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            CheckBox[] boxes = new CheckBox[8];
            boxes[0] = (CheckBox)findViewById(R.id.check0);
            boxes[1] = (CheckBox)findViewById(R.id.check1);
            boxes[2] = (CheckBox)findViewById(R.id.check2);
            boxes[3] = (CheckBox)findViewById(R.id.check3);
            boxes[4] = (CheckBox)findViewById(R.id.check4);
            boxes[5] = (CheckBox)findViewById(R.id.check5);
            boxes[6] = (CheckBox)findViewById(R.id.check6);

            if(boxes[0].isChecked()) {setAlarm(1);}
            if(boxes[1].isChecked()) {setAlarm(2);}
            if(boxes[2].isChecked()) {setAlarm(3);}
            if(boxes[3].isChecked()) {setAlarm(4);}
            if(boxes[4].isChecked()) {setAlarm(5);}
            if(boxes[5].isChecked()) {setAlarm(6);}
            if(boxes[6].isChecked()) {setAlarm(7);}

            Toast.makeText(setAlarm.this, "Alarm has been set!", Toast.LENGTH_SHORT).show();
            //finish();
        }
    });

}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.alarm);
    dimensions();
    alarm();
}

public void setAlarm(int day){
    Calendar calendar = Calendar.getInstance();
    calendar.set(Calendar.DAY_OF_WEEK, day);
    calendar.set(Calendar.HOUR_OF_DAY, setat.get(Calendar.HOUR_OF_DAY));
    calendar.set(Calendar.MINUTE, setat.get(Calendar.MINUTE));
    calendar.set(Calendar.SECOND, 0);

    long time = calendar.getTimeInMillis() - Calendar.getInstance().getTimeInMillis();

    Log.d("day", String.valueOf(day));
    Log.d("time", String.valueOf(setat.get(Calendar.HOUR_OF_DAY)) + ":" + String.valueOf(setat.get(Calendar.MINUTE)));
    Log.d("actual", String.valueOf(Calendar.getInstance().get(Calendar.MINUTE)));

    Intent intent = new Intent(getApplicationContext(), NotificationService.class);
    PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), 100, intent, PendingIntent.FLAG_UPDATE_CURRENT);

    AlarmManager alarmManager = (AlarmManager)getApplicationContext().getSystemService(ALARM_SERVICE);

    alarmManager.setExact(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),  pendingIntent);
}
}

我想在指定的时间和分钟设置闹钟，它应该每周在选定的日子重复该闹钟。问题是，在确认警报后，它会立即触发或不会在选定的时间触发。我以前搜索过这个问题，但找不到对我有用的东西。

Answer 1

如果警报立即响起，则问题可能是时间过去了，而不是未来。您应该尝试确保（在您的 alarm 方法中）calendar.getTimeInMillis() 大于 System.currentTimeMillis()，如果不是，则适当调整日历实例。

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