Change file download location

Question

I got a solution to download files on android, but it downloads with a name programmed in the code, and at the root, I wanted to download with the original name of the file, and save in the folder I wanted, see the code:

public class DownloadFileDemo1 extends Activity {

    ProgressBar pb;
    Dialog dialog;
    int downloadedSize = 0;
    int totalSize = 0;
    TextView cur_val;
    String dwnload_file_path = "http://coderzheaven.com/sample_folder/sample_file.png";
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Button b = (Button) findViewById(R.id.b1);
        b.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                 showProgress(dwnload_file_path);

                    new Thread(new Runnable() {
                        public void run() {
                             downloadFile();
                        }
                      }).start();
            }
        });
    }

    void downloadFile(){

        try {
            URL url = new URL(dwnload_file_path);
            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
            urlConnection.setRequestMethod("GET");
            urlConnection.setDoOutput(true);

            //connect
            urlConnection.connect();

            //set the path where we want to save the file           
            File SDCardRoot = Environment.getExternalStorageDirectory(); 
            //create a new file, to save the downloaded file 
            File file = new File(SDCardRoot,"downloaded_file.png");

            FileOutputStream fileOutput = new FileOutputStream(file);

            //Stream used for reading the data from the internet
            InputStream inputStream = urlConnection.getInputStream();

            //this is the total size of the file which we are downloading
            totalSize = urlConnection.getContentLength();

            runOnUiThread(new Runnable() {
                public void run() {
                    pb.setMax(totalSize);
                }               
            });

            //create a buffer...
            byte[] buffer = new byte[1024];
            int bufferLength = 0;

            while ( (bufferLength = inputStream.read(buffer)) > 0 ) {
                fileOutput.write(buffer, 0, bufferLength);
                downloadedSize += bufferLength;
                // update the progressbar //
                runOnUiThread(new Runnable() {
                    public void run() {
                        pb.setProgress(downloadedSize);
                        float per = ((float)downloadedSize/totalSize) * 100;
                        cur_val.setText("Downloaded " + downloadedSize + "KB / " + totalSize + "KB (" + (int)per + "%)" );
                    }
                });
            }
            //close the output stream when complete //
            fileOutput.close();
            runOnUiThread(new Runnable() {
                public void run() {
                    // pb.dismiss(); // if you want close it..
                }
            });         

        } catch (final MalformedURLException e) {
            showError("Error : MalformedURLException " + e);        
            e.printStackTrace();
        } catch (final IOException e) {
            showError("Error : IOException " + e);          
            e.printStackTrace();
        }
        catch (final Exception e) {
            showError("Error : Please check your internet connection " + e);
        }       
    }

    void showError(final String err){
        runOnUiThread(new Runnable() {
            public void run() {
                Toast.makeText(DownloadFileDemo1.this, err, Toast.LENGTH_LONG).show();
            }
        });
    }

    void showProgress(String file_path){
        dialog = new Dialog(DownloadFileDemo1.this);
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
        dialog.setContentView(R.layout.myprogressdialog);
        dialog.setTitle("Download Progress");

        TextView text = (TextView) dialog.findViewById(R.id.tv1);
        text.setText("Downloading file from ... " + file_path);
        cur_val = (TextView) dialog.findViewById(R.id.cur_pg_tv);
        cur_val.setText("Starting download...");
        dialog.show();

        pb = (ProgressBar)dialog.findViewById(R.id.progress_bar);
        pb.setProgress(0);
        pb.setProgressDrawable(getResources().getDrawable(R.drawable.green_progress));  
    }
}

How do I change to the default name of the file, and in a specified folder?

Answer 1

To get the file name you can do something like this:

String fileName = dwnload_file_path.substring(dwnload_file_path.lastIndexOf('/') + 1, dwnload_file_path.length());

Or use the class FilenameUtils (Apache Commons IO).

And save in a directory other than the root of the SD card, as it is being done, just include in the rest of your variable Sdcardroot (and that would have the name not very appropriate), check the existence to be able or not to create.

File path = new File(Environment.getExternalStorageDirectory() + "/meus_downloads");
File file = null;

if (!path.exists()) {
    if (path.mkdir()) {
        file = new File(path, fileName);
    }
} else {
    file = new File(path, fileName);
}