从AsyncTask的更新进度对话框进度不能建立进度、对话框、AsyncTask

2023-09-06 10:07:12 作者:潇洒无牽挂

我不能建立我的项目,因为日食给错误

下面是按钮单击事件谁开始下载

  button.setOnClickListener(新View.OnClickListener(){    @覆盖    公共无效的onClick(视图v){        ProgressDialog mProgressDialog;        mProgressDialog =新ProgressDialog(Test.this);        mProgressDialog.setMessage(Pobieranie);        mProgressDialog.setIndeterminate(假);        mProgressDialog.setMax(100);        mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);        DownloadFile downloadFile =新DownloadFile();        downloadFile.execute(http://google.com);    }}); 

和AsyncTask的功能

 私有类DownloadFile扩展的AsyncTask<字符串,整数,字符串> {    [...]    @覆盖    在preExecute保护无效(){        super.on preExecute();        mProgressDialog.show(); //这里日食告诉mProgressDialog解决不了    }    @覆盖    保护无效onProgressUpdate(整数...进度){        super.onProgressUpdate(进度);        mProgressDialog.setProgress(进展[0]); //这里日食告诉mProgressDialog解决不了    }} 
如何在Android开发中用AsyncTask异步更新UI界面

那么,我应该插入code谁创建我的进度对话框?

解决方案

 嘿,你需要提供数在此输入code 私有类DownloadFile扩展的AsyncTask<字符串,整数,字符串> {    ProgressDialog mProgressDialog;    字符串文件名= NULL;    @覆盖    在preExecute保护无效(){        super.on preExecute();        //创建进度         mProgressDialog =新ProgressDialog(Task.this);        //设置你的进度标题        mProgressDialog.setTitle(下载);        mProgressDialog.setIcon(R.drawable.dwnload);        //设置您的进度信息        mProgressDialog.setMessage(更新应用程序版本,请等一下!);        mProgressDialog.setIndeterminate(假);        mProgressDialog.setMax(100);        mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);        //显示进度        mProgressDialog.setCancelable(假);      // mProgressDialog.setCanceledOnTouchOutside(假);        mProgressDialog.show();    }    @覆盖    保护字符串doInBackground(字符串... SURL){        尝试{                           字符串apkurl =htt​​p://google.com/\"+fileName;                    网址URL =新的URL(apkurl);                    HttpURLConnection的C =(HttpURLConnection类)网址                            .openConnection();                    c.setRequestMethod(GET);                    c.setDoOutput(真);                    c.connect();                    INT文件长度= c.getContentLength();                    //文件文件=新的文件(路径);                    如果(file.exists())                    {                        file.delete();                    }                    file.mkdirs();                    文件OUTPUTFILE =新的文件(文件,文件名);        最终的FileOutputStream FOS =新的FileOutputStream(OUTPUTFILE);                    最后InputStream为= c.getInputStream();            字节的数据[] =新的字节[1024];            总长= 0;            诠释计数;            而((计数= is.​​read(数据))!=  -  1){                总+ =计数;                //发布进度                publishProgress((int)的(总* 100 /文件长度));                fos.write(数据0,计);            }            //关闭连接            fos.flush();            fos.close();            is.close();            }    }    赶上(例外五){            //错误日志            Log.e(错误,e.getMessage());            e.printStackTrace();        }        返回null; }    @覆盖    保护无效onPostExecute(字符串结果){        // TODO自动生成方法存根     mProgressDialog.dismiss();    }    @覆盖    保护无效onProgressUpdate(整数...进度){        super.onProgressUpdate(进度);        //更新进度        mProgressDialog.setProgress(进展[0]);    }} 

I can't build my project because eclipse giving error

Here is button click event who starting download

button.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        ProgressDialog mProgressDialog;
        mProgressDialog = new ProgressDialog(Test.this);
        mProgressDialog.setMessage("Pobieranie");
        mProgressDialog.setIndeterminate(false);
        mProgressDialog.setMax(100);
        mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        DownloadFile downloadFile = new DownloadFile();
        downloadFile.execute("http://google.com");
    }
});

and AsyncTask function

private class DownloadFile extends AsyncTask<String, Integer, String> {
    [...]
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        mProgressDialog.show(); // Here eclipse tell that "mProgressDialog cannot be resolved"
    }

    @Override
    protected void onProgressUpdate(Integer... progress) {
        super.onProgressUpdate(progress);
        mProgressDialog.setProgress(progress[0]); // Here eclipse tell that "mProgressDialog cannot be resolved"
    }
}

So where I should insert code who create my progress dialog?

解决方案

Hey you need to provide count 
enter code here

 private class DownloadFile extends AsyncTask<String, Integer, String> {
    ProgressDialog  mProgressDialog;
    String fileName=null;
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        // Create ProgressBar
         mProgressDialog = new ProgressDialog(Task.this);
        // Set your ProgressBar Title
        mProgressDialog.setTitle("Downloads");
        mProgressDialog.setIcon(R.drawable.dwnload);
        // Set your ProgressBar Message
        mProgressDialog.setMessage("Updating App Version, Please Wait!");
        mProgressDialog.setIndeterminate(false);
        mProgressDialog.setMax(100);
        mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        // Show ProgressBar
        mProgressDialog.setCancelable(false);
      //  mProgressDialog.setCanceledOnTouchOutside(false);
        mProgressDialog.show();
    }

    @Override
    protected String doInBackground(String... sUrl) {
        try {


                           String apkurl = "http://google.com/"+fileName;
                    URL url = new URL(apkurl);
                    HttpURLConnection c = (HttpURLConnection) url
                            .openConnection();
                    c.setRequestMethod("GET");
                    c.setDoOutput(true);
                    c.connect();
                    int fileLength = c.getContentLength();


                    //File file = new File(PATH);
                    if(file.exists())
                    {
                        file.delete();
                    }
                    file.mkdirs();
                    File outputFile = new File(file, fileName);
        final FileOutputStream fos = new FileOutputStream(outputFile);

                    final InputStream is = c.getInputStream();







            byte data[] = new byte[1024];
            long total = 0;
            int count;
            while ((count = is.read(data)) != -1) {
                total += count;
                // Publish the progress
                publishProgress((int) (total * 100 / fileLength));
                fos.write(data, 0, count);
            }

            // Close connection
            fos.flush();
            fos.close();
            is.close();



            }





    }

    catch (Exception e) {
            // Error Log
            Log.e("Error", e.getMessage());
            e.printStackTrace();
        }
        return null;


 }

    @Override
    protected void onPostExecute(String result) {
        // TODO Auto-generated method stub
     mProgressDialog.dismiss();



    }



    @Override
    protected void onProgressUpdate(Integer... progress) {


        super.onProgressUpdate(progress);
        // Update the ProgressBar
        mProgressDialog.setProgress(progress[0]);



    }



}