Upload interface for android

activity.java

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    try {
        if (requestCode == SELECT_PICTURE
            && resultCode == RESULT_OK
            && null != data) {

            Uri selectedImage = data.getData();
            String[] filePathColumn = {MediaStore.Images.Media.DATA};

            Cursor cursor = getContentResolver().query(selectedImage,
                                                       filePathColumn,
                                                       null, null, null);
            cursor.moveToFirst();
            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            imagePath = cursor.getString(columnIndex);
            cursor.close();

            byte[] bytes = getFileBytes(new File(imagePath));
            imageData = Base64.encodeToString(bytes, Base64.NO_WRAP);

            webView.loadUrl("javascript:MyApp.readFile();");
        } else {
            Toast.makeText(this, "Pick an image", Toast.LENGTH_LONG).show();
        }

    } catch (Exception e) {
        Toast.makeText(this, "Something Wrong", Toast.LENGTH_LONG).show();
    }

}

// Astonished that java cannot do that out of the box
// From http://stackoverflow.com/a/9431216
public static byte[] getFileBytes(File file) throws IOException {
    ByteArrayOutputStream ous = null;
    InputStream ios = null;
    try {
        byte[] buffer = new byte[4096];
        ous = new ByteArrayOutputStream();
        ios = new FileInputStream(file);
        int read = 0;
        while ((read = ios.read(buffer)) != -1)
            ous.write(buffer, 0, read);
    } finally {
        try {
            if (ous != null)
                ous.close();
        } catch (IOException e) {
            // swallow, since not that important
        }
        try {
            if (ios != null)
                ios.close();
        } catch (IOException e) {
            // swallow, since not that important
        }
    }
    return ous.toByteArray();
}

interface.java

// Where you create the webview
webView.addJavascriptInterface(new WebAppInterface(), "Android");

// And the WebAppInterface class.

class WebAppInterface {
    @JavascriptInterface
    public void opengallery() {
        Intent intent = new Intent(Intent.ACTION_PICK);
        intent.setType("image/*");
        startActivityForResult(intent, SELECT_PICTURE);
    }

    @JavascriptInterface
    public String imagePath() {
        return imagePath;
    }

    @JavascriptInterface
    public String imageData() {
        return imageData;
    }
}