使用CounterDownTimer实现时分秒倒计时

   使用android提供的android.os包中的 counterDownTimer可以很方便的实现倒计时功能，具体如下:

   

import android.os.CountDownTimer;

public class Couterdown extends CountDownTimer {

    public Couterdown(long millisInFuture, long countDownInterval) {
        super(millisInFuture, countDownInterval);
        // TODO Auto-generated constructor stub
    }

    @Override
    public void onFinish() {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void onTick(long arg0) {
        
        
    }
    public String  toClock(long millisUntilFinished)
    
    {
        long hour = millisUntilFinished/(60*60*1000);
        long minute = (millisUntilFinished - hour*60*60*1000)/(60*1000);
        long second = (millisUntilFinished - hour*60*60*1000   - minute*60*1000)/1000;
        if(second >= 60 )
        {
          second = second % 60;
          minute+=second/60;
        }
        if(minute >= 60)
        {
          minute = minute %60;
          hour += minute/60;
        }
        String sh = "";
        String sm ="";
        String ss = "";
        if(hour <10)
        {
           sh = "0" + String.valueOf(hour);
        }else
        {
           sh = String.valueOf(hour);
        }
        if(minute <10)
        {
           sm = "0" + String.valueOf(minute);
        }else
        {
           sm = String.valueOf(minute);
        }
        if(second <10)
        {
           ss = "0" + String.valueOf(second);
        }else
        {
           ss = String.valueOf(second);
        }
        return sh +":"+ sm+":" + ss;
    }

}

首先新建一个CounterDown类继承counterDownTimer，然后在activity中使用，并将结果显示在textView上

public class MainActivity extends Activity {

    TextView tv;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv=(TextView)findViewById(R.id.textView1);
        new Couterdown(30000,1000){
            @Override
            public void onTick(long millisUntilFinished) {
                tv.setText(toClock(millisUntilFinished));
                
            }
            @Override
            public String toClock(long millis) {
                return super.toClock(millis);
            }            
        }.start();
    }

    @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;
    }

}

最终结果如图：

之前因为没解决8小时误差的问题，所以用的上面的方法，其实可以像下面这样做

ublic class MainActivity extends Activity {

    TextView tv;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv=(TextView)findViewById(R.id.textView1);
        new CountDownTimer(70000,1000){
            @Override
            public void onTick(long millisUntilFinished) {
                SimpleDateFormat formatter = new SimpleDateFormat("HH:mm:ss");//初始化Formatter的转换格式。  
                formatter.setTimeZone(TimeZone.getTimeZone("GMT+00:00"));
                String hms = formatter.format(millisUntilFinished);  
                tv.setText(hms);
                
            }

            @Override
            public void onFinish() {
                // TODO Auto-generated method stub
                
            }
        
        }.start();
    }

    @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;
    }

}

不过最后都会有个小问题，就是最后一秒不会再减少，应该是counter类的参数问题，哪位大虾看到了给小弟说说解决的办法吧~~~