連續CountDownTimer循環

Question

我正在做一個聖誕節倒計時應用程序，我有應用程序工作的基礎。它倒數到代碼中的指定日期。我想要做的是每當計時器結束時，我想將日期設置到下一年，並再次開始時間，所有這些都不需要用戶做任何事情。

我嘗試了一些像循環和cdt.start();在onFinish()方法中的東西，但似乎都沒有工作。

如果有人能指導我朝着正確的方向，那將是非常感謝。

感謝

MainActivity.java

import android.app.PendingIntent; 
import android.content.Intent; 
import android.content.pm.PackageManager; 
import android.content.pm.ResolveInfo; 
import android.os.CountDownTimer; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.MenuInflater; 
import android.view.MenuItem; 
import android.widget.TextView; 
import java.util.Calendar; 
import java.util.List; 
import java.util.concurrent.TimeUnit; 
import com.google.android.gms.ads.AdRequest; 
import com.google.android.gms.ads.AdView; 
import com.parse.Parse; 
import com.parse.ParseInstallation; 

public class MainActivity extends AppCompatActivity { 
    private PendingIntent pendingIntent; 


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

     //Creating the TextView for the countdown 
     final TextView tv_countdown = (TextView) findViewById(R.id.countdown_text_view); 

     //Set the Calendar Date and Time 
     Calendar start_calendar = Calendar.getInstance(); 
     final Calendar end_calendar = Calendar.getInstance(); 
     end_calendar.set(2016, 11, 25, 24, 0, 0);// 10 = November, month start at 0 = January 

     long start_millis = start_calendar.getTimeInMillis(); //get the start time in milliseconds 
     long end_millis = end_calendar.getTimeInMillis(); //get the end time in milliseconds 
     long total_millis = (end_millis - start_millis); //total time in milliseconds 

     //Convert the time from milliseconds to the correct time specified 
     //1000 = 1 second interval 
     CountDownTimer cdt = new CountDownTimer(total_millis, 1000) { 
      @Override 
      public void onTick(long millisUntilFinished) { 
       long days = TimeUnit.MILLISECONDS.toDays(millisUntilFinished); 
       millisUntilFinished -= TimeUnit.DAYS.toMillis(days);      
       long hours = TimeUnit.MILLISECONDS.toHours(millisUntilFinished); 
       millisUntilFinished -= TimeUnit.HOURS.toMillis(hours); 

       long minutes = TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished); 
       millisUntilFinished -= TimeUnit.MINUTES.toMillis(minutes); 

       long seconds = TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished); 

       //Set the TextVew output 
       tv_countdown.setText(days + " Days" + "\n" + hours + " Hours" + "\n" + minutes + " Minutes" + "\n" + seconds + " Seconds"); //You can compute the millisUntilFinished on hours/minutes/seconds 


      } 

      @Override 
      public void onFinish() { 
       end_calendar.set(2017, 11, 25, 24, 0, 0); 
      } 


     }; 
     cdt.start(); 

Answer 1

只是一個想法如何做到這一點。創建當年的結束日期，如果它已經在過去，則爲下一年創建它。

Calendar start_calendar = Calendar.getInstance(); 
final Calendar end_calendar = Calendar.getInstance(); 
int year = start_calendar.get(YEAR); 
end_calendar.set(year, 11, 25, 24, 0, 0); 

long start_millis = start_calendar.getTimeInMillis(); 
long end_millis = end_calendar.getTimeInMillis(); 
long total_millis = (end_millis - start_millis); 

if (total_millis < 0) { 
    end_calendar.set(year + 1, 11, 25, 24, 0, 0); 
    end_millis = end_calendar.getTimeInMillis(); 
    total_millis = (end_millis - start_millis); 
}