java如何在Android上使用AlarmManager在所需日期显示Toast

Question

在我的应用程序中，我希望在所需日期中显示吐司。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
在这个源代码中，使用时间选择器从用户那里获得时间，但我希望获得时间静态
我想在下面的日期显示吐司：
日期：2017年10月26日 时间：06:49:59

main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 (安卓.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();
    }

}

我该怎么做？我是业余爱好者，请帮帮我<；三,

Answer 1

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();
    }
}

见GregorianCalendar

Answer 2

试试这段代码

 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

根据您的选择创建一个日期，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();
    }
}