android发送文件的进度条

Question

嗨，我在一个android messenger上工作，我需要在发送和接收文件时显示进度条。有人能帮上忙吗？例如，这就是我发送文件的方式，

@Override
    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","null");

            return false;
        }

        Log.i("SocketOP", "sendFILE-1");
        File  f = new File(path);


        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);
        }
        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;        
}
    }

现在我该把条放在哪里，我该怎么做才能向用户显示进度呢？

Answer 1

试试这个::

 private class xyz extends AsyncTask<Void, Void, Void> {
        private final ProgressDialog dialog = new ProgressDialog(tranning.this);

        @Override
        protected void onPreExecute() {
            this.dialog.setMessage("Please Wait...");
            this.dialog.show();
            // put your code which preload with processDialog  
        }


        @Override
        protected Void doInBackground(Void... arg0) {
            // put your code here
Log.i("SocketOP", "sendFILE-1");
        File  f = new File(path);


        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);
        }
        out.flush();
        out.close();
        fileIn.close();
            return null;
        }

        @Override
        protected void onPostExecute(final Void unused) {
            if (this.dialog.isShowing()) {
              this.dialog.dismiss();

            }   
        }
    }

并在main ::中使用它

    new xyz().execute();

Answer 2

在separate thread中执行文件发送任务，而不是在UI线程中。当你启动这个线程时，调用你的进度对话框，并在使用完Handler后将其从线程中移除。

对于Handler，您可以参考此文档：

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

Answer 3

myProgressBar.setProgress(0);
while ((bytesRead = fileIn.read(buffer)) > 0) {
            out.write(buffer, 0, buffer.length);
            //get the previous value of progress bar 
            int old_value = myProgressBar.getProgress();
            //calculate how much did you read from the file
            int new_read =(int)( ((float) f.length() / bytesRead) )*100 ) ;
            //add the new read to the old_value
            int value = new_read+old_value;
            myProgressBar.setProgress(value); 
            System.out.println("SO sendFile" + bytesRead);
        }

如何在android中构建ProgressBar，请参考this link