Question

在我的应用程序中，我希望在所需日期中显示Toast。为此，我知道我应该使用AlarmManager 对于这个AlarmManager，我从互联网上找到了源代码在这个来源中给用户带来时间选择器的时间，但我想让时间静止我希望在下面的日期显示Toast：
日期：2017-10-26
时间：06：49：59

主要活动代码：

public class MainActivity extends AppCompatActivity {

    //the timepicker object
    TimePicker timePicker;


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

        //getting the timepicker object
        timePicker = (TimePicker) findViewById(R.id.timePicker);

        //attaching clicklistener on button
        findViewById(R.id.buttonAlarm).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //We need a calendar object to get the specified time in millis
                //as the alarm manager method takes time in millis to setup the alarm
                Calendar calendar = Calendar.getInstance();
                if (android.os.Build.VERSION.SDK_INT >= 23) {
                    calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH),
                            timePicker.getHour(), timePicker.getMinute(), 0);
                } else {
                    calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH),
                            timePicker.getCurrentHour(), timePicker.getCurrentMinute(), 0);
                }


                setAlarm(calendar.getTimeInMillis());
            }
        });
    }

    private void setAlarm(long time) {
        //getting the alarm manager
        AlarmManager am = (AlarmManager) getSystemService(Context.ALARM_SERVICE);

        //creating a new intent specifying the broadcast receiver
        Intent i = new Intent(this, MyAlarm.class);

        //creating a pending intent using the intent
        PendingIntent pi = PendingIntent.getBroadcast(this, 0, i, 0);

        //setting the repeating alarm that will be fired every day
        am.setRepeating(AlarmManager.RTC, time, AlarmManager.INTERVAL_DAY, pi);
        Toast.makeText(this, "Alarm is set", Toast.LENGTH_SHORT).show();
    }
}

广播代码：

public class MyAlarm extends BroadcastReceiver {

    //the method will be fired when the alarm is triggerred
    @Override
    public void onReceive(Context context, Intent intent) {

        //you can check the log that it is fired
        //Here we are actually not doing anything
        //but you can do any task here that you want to be done at a specific time everyday
        Toast.makeText(context, "Alarm just fired", Toast.LENGTH_SHORT).show();
    }

}

我该怎么办？我是业余爱好者，请帮助我＆lt; 3

Answer 1

根据您的选择创建日期并将其传递给方法setAlarm（）

findViewById(R.id.buttonAlarm).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
SimpleDateFormat sdf = new SimpleDateFormat("dd-M-yyyy hh:mm:ss");
    String dateInString = "26-10-2017 06:49:59";
    long alarmDate = 0L;
    try {
        Date d = sdf.parse(dateInString);
        alarmDate = d.getTime();
    } catch (ParseException e) {
        e.printStackTrace();
    }
}

Answer 2

试用此代码

 new TimePickerDialog(this, new TimePickerDialog.OnTimeSetListener() {
         @Override
         public void onTimeSet(TimePicker view, int hourOfDay, int minutes) {
                 Calendar calendar = Calendar.getInstance();
                 calendar.set(Calendar.HOUR_OF_DAY, hourOfDay);
                 calendar.set(Calendar.MINUTE, minutes);

                 setAlarm(calendar.getTimeInMillis());
           }
 }, hr1, min1, false).show();

Answer 3

public class MainActivity extends AppCompatActivity {

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

        Calendar calendar = new GregorianCalendar(2017, 10, 26, 6, 49, 59);
        setAlarm(calendar.getTimeInMillis());
    }

    private void setAlarm(long time) {
        //getting the alarm manager
        AlarmManager am = (AlarmManager) getSystemService(Context.ALARM_SERVICE);

        //creating a new intent specifying the broadcast receiver
        Intent i = new Intent(this, MyAlarm.class);

        //creating a pending intent using the intent
        PendingIntent pi = PendingIntent.getBroadcast(this, 0, i, 0);

        //setting the alarm that will be fired once
        am.set(AlarmManager.RTC, time, pi);
        Toast.makeText(this, "Alarm is set", Toast.LENGTH_SHORT).show();
    }
}

请参阅GregorianCalendar

如何使用Android上的AlarmManager在所需日期显示Toast

3 个答案: