Android實現計時與倒計時的方法匯總

更新時間：2017年06月06日 08:39:52 作者：fengyeNom1

這篇文章主要介紹了Android實現計時與倒計時的方法匯總，非常不錯，具有參考借鑒價值,需要的朋友可以參考下

方法一

Timer與TimerTask（Java實現）

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）

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

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）

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

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（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線程實現的計時；

方法4和方法5，是另開Runnable線程實現計時

實現方式比較

方法1，采用的是Java實現，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