Question

How can I convert image to binary data..???

I want to send that converted binary data to
another device or to the web server.

Which mechanism is best to do this.?

Answer 1

I found a good example for uploading the image to the server.

• create a bitmap variable before do anything.
• variable to set a name to the image into SD card.
• this variable, you have to put the path for the File, It’s up to you.
• sendData is the function name, to call it, you can use something like
  sendData(null).
• remember to wrap it into a try catch.

private Bitmap bitmap;
public static String exsistingFileName = "";

public void sendData(String[] args) throws Exception {
    try {
        HttpClient httpClient = new DefaultHttpClient();
        HttpContext localContext = new BasicHttpContext();

        // here, change it to your php;
        HttpPost httpPost = new HttpPost("http://www.myURL.com/myPHP.php");
        MultipartEntity entity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);
        bitmap = BitmapFactory.decodeFile(exsistingFileName);

        // you can change the format of you image compressed for what do you want;
        // now it is set up to 640 x 480;
        Bitmap bmpCompressed = Bitmap.createScaledBitmap(bitmap, 640, 480, true);
        ByteArrayOutputStream bos = new ByteArrayOutputStream();

        // CompressFormat set up to JPG, you can change to PNG or whatever you want;
        bmpCompressed.compress(CompressFormat.JPEG, 100, bos);
        byte[] data = bos.toByteArray();

        // sending a String param;
        entity.addPart("myParam", new StringBody("my value"));

        // sending a Image;
        // note here, that you can send more than one image, just add another param, same rule to the String;
        entity.addPart("myImage", new ByteArrayBody(data, "temp.jpg"));
        httpPost.setEntity(entity);
        HttpResponse response = httpClient.execute(httpPost, localContext);
        BufferedReader reader = new BufferedReader(new InputStreamReader(   response.getEntity().getContent(), "UTF-8"));
        String sResponse = reader.readLine();

    } catch (Exception e) {
        Log.v("myApp", "Some error came up");
    }
}