Android网络加载时显示进度条

1.声明变量

private Handler handler = new Handler();
private ProgressDialog progressDialog = null;

2.在需要网络加载时显示进度条对话框

progressDialog = ProgressDialog.show(MyActivity.this, "请稍等...", "获取数据中...", true);

3.构建Runnable对象，在runnable中更新界面

final Runnable   runnableUi=new  Runnable()
{  
   @Override  
   public void run()
　 {  
    //do some work
   }  
};  

4.在子线程中的run方法调用UI线程handler.post 来更新UI

new Thread()
{
    @Override
     public void run()
    {
        handler.post(runInUIThread);
        progressDialog.dismiss();
    }
}.start();