利用Handler刷新界面

實例化一個Handler對象，并重寫handleMessage方法調用invalidate()實現界面刷新；而在線程中通過sendMessage發送界面更新消息。

// 在onCreate()中開啟線程 
       new Thread(new GameThread()).start();、 
  
 
       // 實例化一個handler 
       Handler myHandler   = new Handler()  
       { 
              //接收到消息后處理 
              public void handleMessage(Message msg) 
              { 
                     switch (msg.what) 
                     { 
                     case Activity01.REFRESH: 
                            mGameView.invalidate();        //刷新界面 
                            break; 
                     } 
                     super.handleMessage(msg); 
              }                    
       }; 
  
 
       class GameThread implements Runnable 
       { 
              public void run() 
              { 
                     while (!Thread.currentThread().isInterrupted()) 
                     { 
                            Message message = new Message(); 
                            message.what = Activity01.REFRESH; 
                            //發送消息 
                            Activity01.this.myHandler.sendMessage(message); 
                            try 
                            { 
                                   Thread.sleep(100); 
                            } 
                            catch (InterruptedException e) 
                            { 
                                   Thread.currentThread().interrupt(); 
                            } 
                     } 
              } 
 
       } 

使用postInvalidate()刷新界面

使用postInvalidate則比較簡單，不需要handler，直接在線程中調用postInvalidate即可。

class GameThread implements Runnable 
      { 
             public void run() 
             { 
                    while (!Thread.currentThread().isInterrupted()) 
                    { 
                           try 
                           { 
                                  Thread.sleep(100); 
                           } 
                           catch (InterruptedException e) 
                           { 
                                  Thread.currentThread().interrupt(); 
                           } 
                           //使用postInvalidate可以直接在線程中更新界面 
                           mGameView.postInvalidate(); 
                    } 
             } 
      }