Android 界面刷新

UI中刷新界面：直接調用postInvalidate()方法；

線程中刷新界面：實例化一個Handler對象，並重寫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。

Handler MyHandler   = new Handler()

              //接收到消息後處理

              public void handleMessage(Message msg)

              {

                     switch (msg.what)

                     {

                     case AdroidPanle_PatternPlate.REFRESH:

                            MyImage.invalidate();        //刷新界面

                            break;

                     }

                     super.handleMessage(msg);

              }                   

       };

線程:

class RefreshThread implements Runnable

              public void run()

              {

                     while (!Thread.currentThread().isInterrupted())

                     {

                            Message message = new Message();

                            message.what = AdroidPanle_PatternPlate.REFRESH;

                            //發送消息

                            AdroidPanle_PatternPlate.this.MyHandler.sendMessage(message);

                            try

                            {

                                   Thread.sleep(100);

                            }

                            catch (InterruptedException e)

                            {

                                   Thread.currentThread().interrupt();

                            }

                     }

              }

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