Handler ProgessBar

通过Handler 主线程设置ProgerssBar控件的值， 一个异步的线程Runnable 控制ProgerssBar的值，并把值封装好通过Message 传递给Handler.

package com.xtl.test2;
import javax.security.auth.callback.Callback;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.ProgressBar;
import android.widget.TextView;

public class myProgressBar extends Activity{

    private ProgressBar pb = null;
    private TextView  tvPersent = null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.progressbar);
        pb = (ProgressBar)this.findViewById(R.id.pb);
        tvPersent = (TextView)this.findViewById(R.id.tvPersent);
        Thread thread = new Thread(myRun);
                //开始异步执行
         thread.start();
    }
    
     Handler handler = new Handler(){
         @Override  
          public void handleMessage(Message arg0) {  
            //将要执行的线程放入到队列当中  
             pb.setProgress(arg0.arg1);
             tvPersent.setText(arg0.arg1 + "%");
             pb.setSecondaryProgress(arg0.arg1 + 10);
         }  
     };
     Runnable myRun = new Runnable() {
        int progressValue = 0;
         public void run() {
              while(true){            
                 // TODO Auto-generated method stub
                 //拿到主线程Handler的Message
                  Message msg = handler.obtainMessage();
                  //将进度值作为消息的参数包装进去，进度自加1
                 msg.arg1 = progressValue ++;
                 //将消息发送给主线程的Handler
                 handler.sendMessage(msg);
                 //这个例子是反复循环，实际项目中可能没必要
                  if(progressValue>100){
                     progressValue = 0;
                  }
                  try{
                  //为了让您看到进度滚动效果，放慢进度上升的速度
                  Thread.sleep(300);
                  }
                  catch(InterruptedException e){
                      e.printStackTrace();
                  }
              }
          }
      };
    
}