Java tutorial
//package com.java2s; import java.io.ByteArrayOutputStream; import android.graphics.Bitmap; import android.util.Base64; public class Main { public static String bmpToString(Bitmap bitmap) { String bmpStr = ""; try { ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.PNG, 100, outputStream); byte[] bts = outputStream.toByteArray(); bmpStr = Base64.encodeToString(bts, Base64.DEFAULT); } catch (Exception e) { // TODO: handle exception } return bmpStr; } }