android进度条

Question

嗨，谁能告诉我如何在这个方法中添加一个进度条：

public boolean sendFile(String path,String ip, int port)  {
        // TODO Auto-generated method stub


        try {


            String[] str = ip.split("\\.");

            byte[] IP = new byte[str.length];

            for (int i = 0; i < str.length; i++) {

                IP[i] = (byte) Integer.parseInt(str[i]);


            }
            Socket socket = getSocket(InetAddress.getByAddress(IP), port);
            if (socket == null) {
                Log.i("SO sendFILE","");

                return false;
            }

            Log.i("SocketOP", "sendFILE-1");
            File  f = new File(path);
            String filename=path.substring(path.lastIndexOf("/")+1);
            System.out.println("filename:"+filename); 
            fin.filename = "~"+filename;
            BufferedOutputStream out = new BufferedOutputStream( socket.getOutputStream() );

            FileInputStream fileIn = new FileInputStream(f);
            Log.i("SocketOP", "sendFILE-2");
            byte [] buffer  = new byte [(int)f.length()];
            System.out.println("SO sendFile f.length();" + f.length());
            int bytesRead =0;
            while ((bytesRead = fileIn.read(buffer)) > 0) {
                out.write(buffer, 0, buffer.length);
                System.out.println("SO sendFile" + bytesRead +filename);
            }
            out.flush();
            out.close();
            fileIn.close();
            Log.i("SocketOP", "sendFILE-3");






        } catch (IOException e) {
            return false;           
            //e.printStackTrace();
        }
        //  Toast.makeText(this, "Lvbvhhging...", Toast.LENGTH_SHORT).show();

        return true;     
    }

提前谢谢。

Answer 1

ProgressDialog pbarDialog =  new ProgressDialog( mContext ); 
pbarDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
pbarDialog.setMessage("Loading...");
pbarDialog.setCancelable(false);
pbarDialog.setMax(100);
 pbarDialog .setProgress(0);
 pbarDialog.show();
    while ((bytesRead = fileIn.read(buffer)) > 0) {
                    out.write(buffer, 0, buffer.length);
      //get the previous value of progress bar 
                    int old_value = pbarDialog .getProgress();
                    //calculate how much did you read from the file
                    int new_read =(int)( ((float)  bytesRead/f.length()) )*100 ) ;
                    //add the new read to the old_value
                    int value = new_read+old_value;
                    pbarDialog.setProgress(value);              
      System.out.println("SO sendFile" + bytesRead +filename);
                }
 pbarDialog.dismiss();

Answer 2

您需要从UI线程运行该函数才能显示进度条，但是在函数完成之前，您将无法看到任何进度。对于您正在尝试做的事情，正确的方法是AsyncTask，请检查

http://developer.android.com/reference/android/os/AsyncTask.html