Android实现计时与倒计时(限时抢购)的几种方法

方法一

Timer与TimerTask（Java实现）

[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与Handler（不用Timer的改进型）

[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与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与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与Thread（不占用UI线程）

[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与Runnable（最简单型）   

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与Runnable（最简单型） 

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); 

        } 

    }; 

} 

计时与倒计时

方法1，方法2和方法3，都是倒计时

方法4，方法5，都是计时

计时和倒计时，都可使用上述方法实现（代码稍加改动）

UI线程比较

方法1，方法2和方法3，都是在UI线程实现的计时；

方法4和方法5，是另开Runnable线程实现计时

实现方式比较www.2cto.com

方法1，采用的是Java实现，即Timer和TimerTask方式；

其它四种方法，都采用了Handler消息处理

推荐使用

如果对UI线程交互要求不很高，可以选择方法2和方法3

如果考虑到UI线程阻塞，严重影响到用户体验，推荐使用方法4，另起线程单独用于计时和其它的逻辑处理

方法5，综合了前几种方法的优点，是最简的