ImageUploaderTask.java

 	/***
 	 * Handles uploading an image to a specified url
 	 */
 	class ImageUploaderTask extends AsyncTask<Void, Void, Boolean> {
	    private String mUrl;
	    public ImageUploaderTask(String url) {
	    	mUrl = url;
	    }

	    @Override
	    protected Boolean doInBackground(Void... params) {	         
	    	try {
	    		//Get the image data
		    	Cursor cursor = getContentResolver().query(mImageUri, null,null, null, null);
				cursor.moveToFirst();
				int index = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
				String absoluteFilePath = cursor.getString(index);
				FileInputStream fis = new FileInputStream(absoluteFilePath);
				int bytesRead = 0;
				ByteArrayOutputStream bos = new ByteArrayOutputStream();
				byte[] b = new byte[1024];
				while ((bytesRead = fis.read(b)) != -1) {
					bos.write(b, 0, bytesRead);
				}
				byte[] bytes = bos.toByteArray();
				// Post our image data (byte array) to the server
				URL url = new URL(mUrl.replace("\"", ""));
				HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
				urlConnection.setDoOutput(true);
				urlConnection.setRequestMethod("PUT");
				urlConnection.addRequestProperty("Content-Type", "image/jpeg");
				urlConnection.setRequestProperty("Content-Length", ""+ bytes.length);
				// Write image data to server
				DataOutputStream wr = new DataOutputStream(urlConnection.getOutputStream());
				wr.write(bytes);
				wr.flush();
				wr.close();
				int response = urlConnection.getResponseCode();
				//If we successfully uploaded, return true
				if (response == 201
						&& urlConnection.getResponseMessage().equals("Created")) {
					return true;
				}
	    	} catch (Exception ex) {
	    		Log.e(TAG, ex.getMessage());
	    	}
	        return false;	    	
	    }

	    @Override
	    protected void onPostExecute(Boolean uploaded) {
	        if (uploaded) {
	        	mAlertDialog.cancel();
	        	mStorageService.getBlobsForContainer(mContainerName);
	        }
	    }
	}

Test.java

String sasUrl = ""; // Get the sasUrl from https://hint.azure-mobile.net/api/user/sas
(new ImageUploaderTask(sasUrl)).execute();