Java tutorial
//package com.java2s; //License from project: Open Source License import java.io.ByteArrayOutputStream; import android.graphics.Bitmap; import android.graphics.drawable.BitmapDrawable; import android.util.Base64; import android.widget.ImageView; public class Main { public static String base64Encode(ImageView imageView) { if (imageView.getDrawable() != null) { Bitmap avatarBitmap = ((BitmapDrawable) imageView.getDrawable()).getBitmap(); ByteArrayOutputStream baos = new ByteArrayOutputStream(); avatarBitmap.compress(Bitmap.CompressFormat.PNG, 70, baos); byte[] avatarByteArray = baos.toByteArray(); return Base64.encodeToString(avatarByteArray, Base64.DEFAULT); } else { return null; } } }