Question

我想比较系统时间和用户输入时间，我比较但我不知道它的正确或错误的陈述，因为如果（检查）没有在这里运行是我的代码

 c = Calendar.getInstance();
  SimpleDateFormat df1 = new SimpleDateFormat(" hh:mm a");
    String strdate = df1.format(c.getTime());
    Toast.makeText(getApplicationContext(), strdate , Toast.LENGTH_LONG).show();

以上Toast行显示系统的当前时间，即04:50 AM

Toast.makeText(getApplicationContext(),  prayerTimes.get(0) , Toast.LENGTH_LONG).show();

此吐司线显示用户输入的时间，即06:30 AM

if(strdate ==prayerTimes.get(0))
{
Intent in = new Intent(MainActivity.this, Dialog.class);
startActivity(in);
finish();
Toast.makeText(getApplicationContext(), "yahoo", Toast.LENGTH_LONG).show();
}

当两个时间都相同时如果检查不起作用...请帮助我如何比较两次？

Answer 1

非常简单，以毫秒或分钟转换值time1和time2，并测量差异。

Answer 2

使用equals()代替==，因为您正在比较字符串。

   if(strdate.equals(prayerTimes.get(0)))
{
Intent in = new Intent(MainActivity.this, Dialog.class);
startActivity(in);
finish();
Toast.makeText(getApplicationContext(), "yahoo", Toast.LENGTH_LONG).show();
}

Answer 3

我建议你不要比较两个字符串，而是将两个时间转换成长，然后比较它。要获得当前时间

long currentTime = System.currentTimeMillis();

在下面的函数中传递您的用户时间以获得用户以毫秒为单位的时间，然后比较两者

private long getUserTime(String time){
    SimpleDateFormat df1 = new SimpleDateFormat(" hh:mm a");
    long timeInms = 0;
    Date date = null;
    try {
        date = df1.parse(time);
    } catch (ParseException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
     timeInms = date.getTime();
    return timeInms;

}

Answer 4

＆＃13;

public class NotificationService extends Service {


    private Intent myIntent;
    MaterialDialog dialog;

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        this.myIntent = intent;

        final Handler handler = new Handler();
        Runnable runnable = new Runnable() {
            @RequiresApi(api = Build.VERSION_CODES.N)
            @Override
            public void run() {
                handler.postDelayed(this, 1000);

                Calendar calendar1 = Calendar.getInstance();
                SimpleDateFormat formatter1 = new SimpleDateFormat("dd/M/yyyy h:mm");
                String currentDate = formatter1.format(calendar1.getTime());

                String dateString = "11/08/2017";
                String timeString = "07:00";
                String datadb = dateString + " " + timeString;
             
                //comparing with the exac date/time/year what ever your wish

                if (currentDate.compareTo(datadb) >= 0) {
                    showDialog("msg"); // you can send extra information to service via intent

                }


            }
        };

        handler.postDelayed(runnable, 1000);


        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onCreate() {
        super.onCreate();
        Toast.makeText(getApplicationContext(), "in service created", Toast.LENGTH_LONG).show();

    }

    private void showDialog(String message) {

//  NotificationCompat.Builder mBuilder =
        new NotificationCompat.Builder(this)
                .setSmallIcon(R.drawable.holo_meducate)
                .setLargeIcon(BitmapFactory.decodeResource(getApplicationContext().getResources(), R.drawable.pdf_banner))
                .setContentTitle(msg)
                .setStyle(new NotificationCompat.BigTextStyle()
                        .bigText(Html.fromHtml(description)))
                .setContentText(Html.fromHtml(description))

                .setSound(getNotificationSoundUri());

        mBuilder.setContentIntent(contentIntent);
        mBuilder.setAutoCancel(true);
        mNotificationManager.notify(num, mBuilder.build());
        setLatestNotificationFlag();
    }


    @Override
    public void onDestroy() {
        if (dialog != null) {
            dialog.dismiss();
        }
        super.onDestroy();
    }

＆＃13;

启动服务并在服务内部启动一个可循环的thrade in循环，每30秒重新发生一次，并将系统时间与所需时间进行比较，这将自动触发通知......

如何在android中比较时间

4 个答案: