HandlerThread怎么更新ui

Question

HandlerThread怎么更新ui，我试了很多方法，都不能更新ui，求大神们指导一下

 HandlerThread handlerThread = new HandlerThread(getMainLooper().toString());
        handlerThread.start();
        MyHandler myHandler = new MyHandler(handlerThread.getLooper());
        Message message = myHandler.obtainMessage();
        message.sendToTarget();

                public class MyHandler extends Handler {
    public MyHandler(Looper looper){
        super(looper);
    }
    @Override
    public void handleMessage(Message msg) {
        super.handleMessage(msg);
    }
} 

在handleMessage(Message msg)方法里怎么不能更新ui

Answer 1

handler.send(Message message)，或者handler.post (Runnable r);
2.View.post(Runnable r);

/**

• 更新UI方法之 view.post(Runnable r)
• @author vincentTung

• */
  class ViewPostThread extends Thread{

  @Override 
  public void run() { 
      super.run(); 
      while(count<101){ 
          /** 
           * view.post(Runnable) 
           */ 
          bar.post(new Runnable() { 
  
              @Override 
              public void run() { 
                  isChanging = true; 
                  bar.setProgress(count); 
                  count++; 
  
              }}); 
  
          /** 
           * view.postDelayed(Runnable,delayTime) 
           */ 
  

  // bar.postDelayed(new Runnable() {
  //
  // @Override
  // public void run() {
  // isChanging = true;
  // bar.setProgress(count);
  // count++;
  //
  // }},100);
  //
  
  try {
  Thread.sleep(100);
  } catch (InterruptedException e) {
  e.printStackTrace();
  }
  }

  } 
  

  }
  3.Activity的RunOnUIThread(Runnable r);
  class ViewPostThread extends Thread{

  @Override 
  public void run() { 
      super.run(); 
      while(count<101){ 
          runOnUiThread(new Runnable() { 
  
              @Override 
              public void run() { 
                  isChanging = true; 
                  bar.setProgress(count); 
                  count++; 
  
              }}); 
  
          try { 
              Thread.sleep(100); 
          } catch (InterruptedException e) { 
              e.printStackTrace(); 
          } 
      } 
  
  } 
  

  }
  4.通过HandlerThread进行更新

/**

• 更新UI方法之
  
• ---- HandlerThread
• HandlerThread与普通Thread的区别是，普通Thread 默认不带Looper的，
• 需要调用Looper.prepare()方法为线程分配出有一个Looper，然后通过Looper.loop()方法让Looper转起来，循环分发消息Message
• 而HandlerThread就可以看作是默认就非配有Looper的线程Thread
• 1.在子线程中声明Handler
  
• 2.在子线程的run()方法中：Looper.prepare();//为子线程分配一个Looper
• 3.在子线程的run()方法中：处理操作，并发送Message
• 4.在子线程的run()方法中: Looper.loop();//让Loop转起来
• @author vincentTung

• */

  private HandlerThread handlerThread =new HandlerThread("handler_thread"){

  private Handler handler = new Handler(){ 
  
      public void handleMessage(android.os.Message msg) { 
          count++; 
          bar.setProgress(count); 
          if(count==100){ 
  
              Toast.makeText(HandlerThreadTest.this, "Done", 1).show(); 
          } 
      }; 
  }; 
  

  使用时候调用
  handlerThread.start();
  5.在子线程中更新，前提是得Loop.prepare( );

/**

• 更新UI方法之
  
• ---- 带Looper的子线程
• 1.在子线程中声明Handler
  
• 2.在子线程的run()方法中：Looper.prepare();//为子线程分配一个Looper
• 3.在子线程的run()方法中：处理操作，并发送Message
• 4.在子线程的run()方法中: Looper.loop();//让Loop转起来
• @author vincentTung

• */
  class NormalThread extends Thread{
  private int count=0;
  private Handler handler = new Handler(){
  public void handleMessage(android.os.Message msg) {
  count++;
  bar.setProgress(count);
  };};
  @Override
  public void run() {
  super.run();
  Looper.prepare();
  while(count<=100){

              handler.sendEmptyMessage(0); 
              try { 
                  Thread.sleep(100); 
              } catch (InterruptedException e) { 
                  e.printStackTrace(); 
              } 
  
          } 
          Looper.loop(); 
      } 
  

  }