ProgressDialog在单独的线程中 [英] ProgressDialog in a separate thread

问题描述

我有一个从数据库中提取数据并将其填充到列表中的过程.我想在执行查询时显示进度对话框，但仅在执行查询后才可视地显示.我相信我必须在单独的线程中运行ProgressDialog，但遵循的建议很少，无法正常工作.

I have a procedure that extracts data from a database and populates it to the list. I want to display progress dialog box while query is executed, but it visually appears only after the query is executed. I believe I have to run a ProgressDialog in a separate thread, but followed few suggestions and could not make it work.

所以在我的Activity中我只有

private void DisplayAllproductListView(String SqlStatement) {           
     ProgressDialog dialog = 
     ProgressDialog.show(MyActivity.context, "Loading", "Please wait...", true);
     //..................
     //..................
     //execute sql query here
     dialog.dismiss();
   }

谢谢

推荐答案

1.在主线程中显示进程对话框

1.show your process dialog in main thread

2.启动一个新线程(例如线程A)以处理繁重的工作

2.start a new thread (such as Thread A) to process your heavy job

3.完成后，使用处理程序从线程A向主线程发送消息，主线程关闭进程对话框

3.when done, use handler to send a message from Thread A to main thread, the latter dismisses the process dialog

这样的代码 私人ProcessDialog pd;

code like this private ProcessDialog pd;

private void startDialog()
{

 pd = ProgressDialog.show(MainActivity.this, "title", "loading");  

     //start a new thread to process job
     new Thread(new Runnable() {  
         @Override  
         public void run() {  
             //heavy job here
             //send message to main thread
             handler.sendEmptyMessage(0); 
          }  
      }).start(); 
}

Handler handler = new Handler() {  
    @Override  
    public void handleMessage(Message msg) {
        pd.dismiss(); 
    }  
};

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