Java tutorial
//package com.java2s; import android.graphics.Bitmap; import android.util.Base64; import java.io.ByteArrayOutputStream; public class Main { public static String bitmapToBase64(Bitmap bmp) { ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(); bmp.compress(Bitmap.CompressFormat.PNG, 75, byteArrayOutputStream); byte[] imgBytes = byteArrayOutputStream.toByteArray(); return Base64.encodeToString(imgBytes, Base64.DEFAULT); } }