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方法一

Timer與TimerTask（Java實現(xiàn)）

[java]
public class timerTask extends Activity{   
  
    private int recLen = 11;   
    private TextView txtView;   
    Timer timer = new Timer();   
  
    public void onCreate(Bundle savedInstanceState){   
        super.onCreate(savedInstanceState);   
           
        setContentView(R.layout.timertask);   
        txtView = (TextView)findViewById(R.id.txttime);   
           
        timer.schedule(task, 1000, 1000);       // timeTask    
    }      
  
    TimerTask task = new TimerTask() {   
        @Override   
        public void run() {   
  
            runOnUiThread(new Runnable() {      // UI thread    
                @Override   
                public void run() {   
                    recLen--;   
                    txtView.setText(""+recLen);   
                    if(recLen < 0){   
                        timer.cancel();   
                        txtView.setVisibility(View.GONE);   
                    }   
                }   
            });   
        }   
    };   
}   

public class timerTask extends Activity{ 
 
    private int recLen = 11; 
    private TextView txtView; 
    Timer timer = new Timer(); 
 
    public void onCreate(Bundle savedInstanceState){ 
        super.onCreate(savedInstanceState); 
         
        setContentView(R.layout.timertask); 
        txtView = (TextView)findViewById(R.id.txttime); 
         
        timer.schedule(task, 1000, 1000);       // timeTask 
    }    
 
    TimerTask task = new TimerTask() { 
        @Override 
        public void run() { 
 
            runOnUiThread(new Runnable() {      // UI thread 
                @Override 
                public void run() { 
                    recLen--; 
                    txtView.setText(""+recLen); 
                    if(recLen < 0){ 
                        timer.cancel(); 
                        txtView.setVisibility(View.GONE); 
                    } 
                } 
            }); 
        } 
    }; 
} 

方法二
TimerTask與Handler（不用Timer的改進型）

[java]
public class timerTask extends Activity{   
    private int recLen = 11;   
    private TextView txtView;   
    Timer timer = new Timer();   
  
    public void onCreate(Bundle savedInstanceState){   
        super.onCreate(savedInstanceState);   
  
        setContentView(R.layout.timertask);   
        txtView = (TextView)findViewById(R.id.txttime);   
  
        timer.schedule(task, 1000, 1000);       // timeTask    
    }      
  
    final Handler handler = new Handler(){   
        @Override   
        public void handleMessage(Message msg){   
            switch (msg.what) {   
            case 1:   
                txtView.setText(""+recLen);   
                if(recLen < 0){   
                    timer.cancel();   
                    txtView.setVisibility(View.GONE);   
                }   
            }   
        }   
    };   
  
    TimerTask task = new TimerTask() {   
        @Override   
        public void run() {   
            recLen--;   
            Message message = new Message();   
            message.what = 1;   
            handler.sendMessage(message);   
        }   
    };   
}   

public class timerTask extends Activity{ 
    private int recLen = 11; 
    private TextView txtView; 
    Timer timer = new Timer(); 
 
    public void onCreate(Bundle savedInstanceState){ 
        super.onCreate(savedInstanceState); 
 
        setContentView(R.layout.timertask); 
        txtView = (TextView)findViewById(R.id.txttime); 
 
        timer.schedule(task, 1000, 1000);       // timeTask 
    }    
 
    final Handler handler = new Handler(){ 
        @Override 
        public void handleMessage(Message msg){ 
            switch (msg.what) { 
            case 1: 
                txtView.setText(""+recLen); 
                if(recLen < 0){ 
                    timer.cancel(); 
                    txtView.setVisibility(View.GONE); 
                } 
            } 
        } 
    }; 
 
    TimerTask task = new TimerTask() { 
        @Override 
        public void run() { 
            recLen--; 
            Message message = new Message(); 
            message.what = 1; 
            handler.sendMessage(message); 
        } 
    }; 
} 

方法三

[java]
Handler與Message（不用TimerTask） 
 
public class timerTask extends Activity{   
    private int recLen = 11;   
    private TextView txtView;   
  
    public void onCreate(Bundle savedInstanceState) {     
        super.onCreate(savedInstanceState);     
  
        setContentView(R.layout.timertask);    
        txtView = (TextView)findViewById(R.id.txttime);   
  
        Message message = handler.obtainMessage(1);     // Message    
        handler.sendMessageDelayed(message, 1000);   
    }     
  
    final Handler handler = new Handler(){   
  
        public void handleMessage(Message msg){         // handle message    
            switch (msg.what) {   
            case 1:   
                recLen--;   
                txtView.setText("" + recLen);   
  
                if(recLen > 0){   
                    Message message = handler.obtainMessage(1);   
                    handler.sendMessageDelayed(message, 1000);      // send message    
                }else{   
                    txtView.setVisibility(View.GONE);   
                }   
            }   
  
            super.handleMessage(msg);   
        }   
    };   
}   

Handler與Message（不用TimerTask）

public class timerTask extends Activity{ 
    private int recLen = 11; 
    private TextView txtView; 
 
    public void onCreate(Bundle savedInstanceState) {   
        super.onCreate(savedInstanceState);   
 
        setContentView(R.layout.timertask);  
        txtView = (TextView)findViewById(R.id.txttime); 
 
        Message message = handler.obtainMessage(1);     // Message 
        handler.sendMessageDelayed(message, 1000); 
    }   
 
    final Handler handler = new Handler(){ 
 
        public void handleMessage(Message msg){         // handle message 
            switch (msg.what) { 
            case 1: 
                recLen--; 
                txtView.setText("" + recLen); 
 
                if(recLen > 0){ 
                    Message message = handler.obtainMessage(1); 
                    handler.sendMessageDelayed(message, 1000);      // send message 
                }else{ 
                    txtView.setVisibility(View.GONE); 
                } 
            } 
 
            super.handleMessage(msg); 
        } 
    }; 
} 

方法四

Handler與Thread（不占用UI線程）

[java]
public class timerTask extends Activity{   
    private int recLen = 0;   
    private TextView txtView;   
  
    public void onCreate(Bundle savedInstanceState){   
        super.onCreate(savedInstanceState);   
  
        setContentView(R.layout.timertask);   
        txtView = (TextView)findViewById(R.id.txttime);   
           
        new Thread(new MyThread()).start();         // start thread    
    }      
  
    final Handler handler = new Handler(){          // handle    
        public void handleMessage(Message msg){   
            switch (msg.what) {   
            case 1:   
                recLen++;   
                txtView.setText("" + recLen);   
            }   
            super.handleMessage(msg);   
        }   
    };   
  
    public class MyThread implements Runnable{      // thread    
        @Override   
        public void run(){   
            while(true){   
                try{   
                    Thread.sleep(1000);     // sleep 1000ms    
                    Message message = new Message();   
                    message.what = 1;   
                    handler.sendMessage(message);   
                }catch (Exception e) {   
                }   
    

public class timerTask extends Activity{ 
    private int recLen = 0; 
    private TextView txtView; 
 
    public void onCreate(Bundle savedInstanceState){ 
        super.onCreate(savedInstanceState); 
 
        setContentView(R.layout.timertask); 
        txtView = (TextView)findViewById(R.id.txttime); 
         
        new Thread(new MyThread()).start();         // start thread 
    }    
 
    final Handler handler = new Handler(){          // handle 
        public void handleMessage(Message msg){ 
            switch (msg.what) { 
            case 1: 
                recLen++; 
                txtView.setText("" + recLen); 
            } 
            super.handleMessage(msg); 
        } 
    }; 
 
    public class MyThread implements Runnable{      // thread 
        @Override 
        public void run(){ 
            while(true){ 
                try{ 
                    Thread.sleep(1000);     // sleep 1000ms 
                    Message message = new Message(); 
                    message.what = 1; 
                    handler.sendMessage(message); 
                }catch (Exception e) { 
                } 
  

方法五

[java]
Handler與Runnable（最簡單型）   
 
public class timerTask extends Activity{   
    private int recLen = 0;   
    private TextView txtView;   
  
    public void onCreate(Bundle savedInstanceState){   
        super.onCreate(savedInstanceState);   
  
        setContentView(R.layout.timertask);   
        txtView = (TextView)findViewById(R.id.txttime);   
           
        handler.postDelayed(runnable, 1000);   
    }      
  
    Handler handler = new Handler();   
    Runnable runnable = new Runnable() {   
        @Override   
        public void run() {   
            recLen++;   
            txtView.setText("" + recLen);   
            handler.postDelayed(this, 1000);   
        }   
    };   
}   

Handler與Runnable（最簡單型） 

public class timerTask extends Activity{ 
    private int recLen = 0; 
    private TextView txtView; 
 
    public void onCreate(Bundle savedInstanceState){ 
        super.onCreate(savedInstanceState); 
 
        setContentView(R.layout.timertask); 
        txtView = (TextView)findViewById(R.id.txttime); 
         
        handler.postDelayed(runnable, 1000); 
    }    
 
    Handler handler = new Handler(); 
    Runnable runnable = new Runnable() { 
        @Override 
        public void run() { 
            recLen++; 
            txtView.setText("" + recLen); 
            handler.postDelayed(this, 1000); 
        } 
    }; 
} 

計時與倒計時
方法1，方法2和方法3，都是倒計時
方法4，方法5，都是計時
計時和倒計時，都可使用上述方法實現(xiàn)（代碼稍加改動）

UI線程比較
方法1，方法2和方法3，都是在UI線程實現(xiàn)的計時；
方法4和方法5，是另開Runnable線程實現(xiàn)計時

實現(xiàn)方式比較www.2cto.com
方法1，采用的是Java實現(xiàn)，即Timer和TimerTask方式；
其它四種方法，都采用了Handler消息處理

推薦使用
如果對UI線程交互要求不很高，可以選擇方法2和方法3
如果考慮到UI線程阻塞，嚴重影響到用戶體驗，推薦使用方法4，另起線程單獨用于計時和其它的邏輯處理
方法5，綜合了前幾種方法的優(yōu)點，是最簡的