How can I convert an image into a Base64 string?

android base64
NullPointerException picture NullPointerException · Jan 28, 2011 · Viewed 242.4k times · Source

What is the code to transform an image (maximum of 200 KB) into a Base64 String?

I need to know how to do it with Android, because I have to add the functionality to upload images to a remote server in my main app, putting them into a row of the database, as a string.

I am searching in Google and in Stack Overflow, but I could not find easy examples that I can afford and also I find some examples, but they are not talking about to transform into a String. Then I need to transform into a string to upload by JSON to my remote server.

Answer

xil3 picture xil3 · Jan 28, 2011

You can use the Base64 Android class:

String encodedImage = Base64.encodeToString(byteArrayImage, Base64.DEFAULT);

You'll have to convert your image into a byte array though. Here's an example:

Bitmap bm = BitmapFactory.decodeFile("/path/to/image.jpg");
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.JPEG, 100, baos); // bm is the bitmap object
byte[] b = baos.toByteArray();

* Update *

If you're using an older SDK library (because you want it to work on phones with older versions of the OS) you won't have the Base64 class packaged in (since it just came out in API level 8 AKA version 2.2).

Check this article out for a workaround:

How to base64 encode decode Android

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