Java tutorial
//package com.java2s; import android.graphics.Bitmap; import android.util.Base64; import java.io.ByteArrayOutputStream; public class Main { public static String bmpToStrBase64(Bitmap bitmap) { Bitmap bm = bitmap; ByteArrayOutputStream stream = new ByteArrayOutputStream(); bm.compress(Bitmap.CompressFormat.JPEG, 80, stream); //bm is the bitmap object byte[] b = stream.toByteArray(); String strBase64 = Base64.encodeToString(b, 0); return strBase64; } }