Java tutorial
//package com.java2s; import android.graphics.Bitmap; import android.util.Base64; import java.io.ByteArrayOutputStream; public class Main { public static String getBitmapStrBase64(Bitmap bitmap) { ByteArrayOutputStream baos = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos); byte[] bytes = baos.toByteArray(); return Base64.encodeToString(bytes, 0); } }