Android中加载另一个Activity时无法显示进度条

发布于 2024-08-26 01:29:29 字数 846 浏览 5 评论 0原文

这可能是一个简单的问题，但我是初学者，我需要你的建议。我有两个活动 A1 和 A2。当我单击 A1 屏幕上的图像时，我必须显示进度条，直到出现 A2 屏幕（A2 活动有大量任务要做）。我尝试过

 image.setOnClickListener(new ImageView.OnClickListener() {

            public void onClick(View v)
            {

             myProgressDialog = ProgressDialog.show(A1.this,     
                        "Please wait...", "Loading...", true);

              new Thread() {
                   public void run() {
                        try{



                        Intent i = new Intent(A1.this,.A2.class);
                        startActivity(i);


                        } catch (Exception e) {  }
                        // Dismiss the Dialog
                        myProgressDialog.dismiss();
                   }
              }.start();


             }
        });

这无法显示进度条。我知道我我犯了一个错误，但我不明白

原文

This may be a simple question but i am a beginner ,i need your suggestion on this.
i have two Activities A1 and A2 .When i click the image on A1 screen i have to display progress bar until A2 screen appears(A2 activity has huge task to do).I tried

 image.setOnClickListener(new ImageView.OnClickListener() {

            public void onClick(View v)
            {

             myProgressDialog = ProgressDialog.show(A1.this,     
                        "Please wait...", "Loading...", true);

              new Thread() {
                   public void run() {
                        try{



                        Intent i = new Intent(A1.this,.A2.class);
                        startActivity(i);


                        } catch (Exception e) {  }
                        // Dismiss the Dialog
                        myProgressDialog.dismiss();
                   }
              }.start();


             }
        });

This couldn't display progress bar .I know that i am making a mistake but i couldn't figure out

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潇烟暮雨 2024-09-02 01:29:29

最好的办法是在 A2 活动中显示进度对话框。一旦启动一个活动，前一个活动就会进入后台，因此进度对话框无论如何都不会显示。

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看海 2024-09-02 01:29:29

首先，需要在单独的线程上调用进度对话框。使用 AsyncTask<>显示对话框并同时在后台执行一些操作。示例代码可能是这样的

class hello extends AsyncTask<Void,Void,Void>
{
       ProgressDialog dialog=null;
       Intent i;

   @Override
   protected void onPreExecute() 
   {


           dialog=ProgressDialog.show(A1.this,"PLEASE WAIT","LOADING CONTENTS  ..",true);
   }

    @Override
    protected void onPostExecute(Void result) 
    {
            if(dialog.isShowing())
                    {
                       dialog.dismiss();
                       startActivity(i);
                    }           
    }

    @Override
    protected Void doInBackground(Void... params) 
    {
        i = new Intent(A1.this,.A2.class);
                    return null;
    }

First of all , the progress dialog needs to be called on a separate thread . Use the AsyncTask<> to display the dialog and at the same time perform some operation in the background . A sample code might be something like this

class hello extends AsyncTask<Void,Void,Void>
{
       ProgressDialog dialog=null;
       Intent i;

   @Override
   protected void onPreExecute() 
   {


           dialog=ProgressDialog.show(A1.this,"PLEASE WAIT","LOADING CONTENTS  ..",true);
   }

    @Override
    protected void onPostExecute(Void result) 
    {
            if(dialog.isShowing())
                    {
                       dialog.dismiss();
                       startActivity(i);
                    }           
    }

    @Override
    protected Void doInBackground(Void... params) 
    {
        i = new Intent(A1.this,.A2.class);
                    return null;
    }

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