Java tutorial
//package com.java2s; import java.io.File; import java.io.FileInputStream; import android.os.Environment; import android.util.Base64; public class Main { public static String setImBin(String fName) { FileInputStream fileInputStream = null; File file = new File(Environment.getExternalStorageDirectory().getPath(), "Pictures/" + fName); byte[] bFile = new byte[(int) file.length()]; try { fileInputStream = new FileInputStream(file); fileInputStream.read(bFile); fileInputStream.close(); } catch (Exception e) { e.printStackTrace(); } return Base64.encodeToString(bFile, Base64.DEFAULT); } }