Android如何使倒計時像倒計時鐘？

Question

我在我的應用程序中使用countdowntimer，我在簡單的dateformat中顯示日期，但我的countdowntimer沒有顯示，簡單的時鐘正在工作，我想顯示我的日曆像countdowntimer.Here是我的代碼。

public class MainActivity extends Activity { 
ListView mListView; 
MyCountDownTimer mMyCountDownTimer; 
TextView text1; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 

    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    mListView = (ListView) findViewById(R.id.listView); 
    MyAdapter adapter = new MyAdapter(this); 
    mListView.setAdapter(adapter); 

    mMyCountDownTimer = new MyCountDownTimer(1000, 1000, adapter); 
} 


@Override 
protected void onResume() { 

    super.onResume(); 
    mMyCountDownTimer.start(); 
} 

@Override 
protected void onPause() { 

    mMyCountDownTimer.cancel(); 
    super.onPause(); 
} 


//countdowntimerclass 
public class MyCountDownTimer extends CountDownTimer { 

    BaseAdapter mAdapter; 

    public MyCountDownTimer(long millisInFuture, long countDownInterval, BaseAdapter adapter) { 

     super(millisInFuture, countDownInterval); 
     mAdapter = adapter; 
    } 

    @Override 
    public void onFinish() { 

     mAdapter.notifyDataSetChanged(); 
     this.start(); 
    } 

    @Override 
    public void onTick(long millisUntilFinished) { 
     text1.setText("" + millisUntilFinished/1000); 
    } 


} 
public class MyAdapter extends BaseAdapter { 

    private static final int COUNT = 50; 
    private boolean firstscroll=true; 
    private Context context; 
    private DateFormat dateFormat; 

    public MyAdapter(Context context) { 

     this.context = context; 

    } 

    @Override 
    public int getCount() { 

     return COUNT; 
    } 

    @Override 
    public String getItem(int position) { 

     return "Item " + String.valueOf(position); 
    } 

    @Override 
    public long getItemId(int position) { 

     return position; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 

     if (convertView == null) { 
      convertView = LayoutInflater.from(getContext()).inflate(android.R.layout.two_line_list_item, parent, false); 
     } 
     Calendar c = Calendar.getInstance(); 
     System.out.println("Current time => "+c.getTime()); 

     SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss",Locale.US); 
     String formattedDate = df.format(c.getTime()); 
     text1 = (TextView) convertView.findViewById(android.R.id.text1); 
     if (position==0) { 

      text1.setText(getItem(position).valueOf(formattedDate)); 
     } 
     else { 
      text1.setText(null); 
     } 

     return convertView; 
    } 

    private CharSequence getTimeString(int position) { 

     if (position % 2 == 0) { 

      // return dateFormat.format(Calendar.getInstance().getTime()); 
     } 
     else { 
      return null; 
     } 
     return null; 
    } 

    private Context getContext() { 

     return context; 
    } 
} 


    } 

謝謝。

Answer 1

package com.example.diffrence; 

import java.text.ParseException; 
import java.text.SimpleDateFormat; 
import java.util.Date; 
import java.util.Timer; 
import java.util.TimerTask; 

import android.app.Activity; 
import android.os.Bundle; 
import android.view.Menu; 
import android.widget.LinearLayout; 
import android.widget.TextView; 

public class MainActivity extends Activity { 

    TextView txt; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     txt = (TextView) findViewById(R.id.test); 


     Timer notificationtask = new Timer(); 

     notificationtask.schedule(new TimerTask() { 
      @Override 
      public void run() { 
       // TODO Auto-generated method stub 
       runOnUiThread(new Runnable() { 

        @Override 
        public void run() { 
         // TODO Auto-generated method stub 
         SimpleDateFormat simpleDateFormat = 
           new SimpleDateFormat("dd/M/yyyy hh:mm:ss"); 
        try { 
         Date date1 = simpleDateFormat.parse("10/10/2014 11:30:10"); 

         String currentDateandTime = simpleDateFormat.format(new Date()); 
         Date date2 = simpleDateFormat.parse(currentDateandTime); 
         txt.setText("time Remainig to date 10/10/2014 11:30:10 : " + printDifference(date1,date2)); 

        } catch (ParseException e) { 
         // TODO Auto-generated catch block 
         e.printStackTrace(); 
        } 
        } 
       }); 
      } 
     }, 1000, 1000); 




    } 

    public String printDifference(Date startDate, Date endDate){ 

      //milliseconds 
      long different = endDate.getTime() - startDate.getTime(); 

      System.out.println("startDate : " + startDate); 
      System.out.println("endDate : "+ endDate); 
      System.out.println("different : " + different); 

      long secondsInMilli = 1000; 
      long minutesInMilli = secondsInMilli * 60; 
      long hoursInMilli = minutesInMilli * 60; 
      long daysInMilli = hoursInMilli * 24; 

      long elapsedDays = different/daysInMilli; 
      different = different % daysInMilli; 

      long elapsedHours = different/hoursInMilli; 
      different = different % hoursInMilli; 

      long elapsedMinutes = different/minutesInMilli; 
      different = different % minutesInMilli; 

      long elapsedSeconds = different/secondsInMilli; 


      return Math.abs(elapsedDays) + " days  " + 
        Math.abs(elapsedHours)+ " hours " + 
          Math.abs(elapsedMinutes)+ " minute " + 
            Math.abs(elapsedSeconds) + " Seconds "; 

     } 






    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.main, menu); 
     return true; 
    } 

}