Download and open files to external storage android

Question

currently I am trying to download files from a certain URL to the external storage or microsd of my device and then open it after the download is complete. I followed the answer from here

Here is inside my oncreate:

// execute this when the downloader must be fired
    final DownloadTask downloadTask = new DownloadTask(MainActivity.this);
    if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, permission_external_memory);
        return;
    } else {
        downloadTask.execute("http://www.sample-videos.com/doc/Sample-doc-file-100kb.doc");
    }

And here is my downloader asynctask code:

private class DownloadTask extends AsyncTask<String, Integer, String> {

    private Context context;
    private PowerManager.WakeLock mWakeLock;

    public DownloadTask(Context context) {
        this.context = context;
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        // take CPU lock to prevent CPU from going off if the user
        // presses the power button during download
        PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
        mWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,
                getClass().getName());
        mWakeLock.acquire();
        mProgressDialog.show();
    }

    @Override
    protected void onProgressUpdate(Integer... progress) {
        super.onProgressUpdate(progress);
        // if we get here, length is known, now set indeterminate to false
        mProgressDialog.setIndeterminate(false);
        mProgressDialog.setMax(100);
        mProgressDialog.setProgress(progress[0]);
    }

    @Override
    protected String doInBackground(String... sUrl) {
        InputStream input = null;
        OutputStream output = null;
        HttpURLConnection connection = null;
        try {
            URL url = new URL(sUrl[0]);
            connection = (HttpURLConnection) url.openConnection();
            connection.connect();

            // expect HTTP 200 OK, so we don't mistakenly save error report
            // instead of the file
            if (connection.getResponseCode() != HttpURLConnection.HTTP_OK) {
                return "Server returned HTTP " + connection.getResponseCode()
                        + " " + connection.getResponseMessage();
            }

            // this will be useful to display download percentage
            // might be -1: server did not report the length
            int fileLength = connection.getContentLength();

            // download the file
            input = connection.getInputStream();
            File mypath = new File(Environment.getExternalStorageDirectory(), "myfiletest.doc");
            output = new FileOutputStream(mypath);

            byte data[] = new byte[4096];
            long total = 0;
            int count;
            while ((count = input.read(data)) != -1) {
                // allow canceling with back button
                if (isCancelled()) {
                    input.close();
                    return null;
                }
                total += count;
                // publishing the progress....
                if (fileLength > 0) // only if total length is known
                    publishProgress((int) (total * 100 / fileLength));
                output.write(data, 0, count);
            }
        } catch (Exception e) {
            return e.toString();
        } finally {
            try {
                if (output != null)
                    output.close();
                if (input != null)
                    input.close();
            } catch (IOException ignored) {
            }

            if (connection != null)
                connection.disconnect();
        }
        return null;
    }

    @Override
    protected void onPostExecute(String result) {
        mWakeLock.release();
        mProgressDialog.dismiss();
        if (result != null)
            Toast.makeText(context, "Download error: " + result, Toast.LENGTH_LONG).show();
        else {
            Toast.makeText(context, "File downloaded", Toast.LENGTH_SHORT).show();
            Intent intent = new Intent();
            intent.setAction(Intent.ACTION_VIEW);
            intent.setDataAndType(Uri.parse(Environment.getExternalStorageDirectory(), "myfiletest.doc"), "text/*");
            context.startActivity(intent);
        }
    }

}

But after the download is completed, I can't open the file and I also can't find the downloaded file with file manager. This is the dialog shown after the download completed and trying to open the file:

What did I do wrong here?

Answer 1

I've tried your code. It is working perfectly instead of this line:

intent.setDataAndType(Uri.parse(Environment.getExternalStorageDirectory(), "myfiletest.doc"), "text/*");

So I changed it to:

 intent.setDataAndType(Uri.parse(Environment.getExternalStorageDirectory().getAbsolutePath()+"/myfiletest.doc"), "text/*");

And given all the permissions explicitly from settings ans also included all required permissions. After downloading it asks using which app you want to open the downloaded file? Selecting appropriate option it opens a file.

So the you are missing explicit permissions only. Cheers!

EDIT: It saved to /storage/emulated/0/