Question

Today I tried including the apache.commons.codec package in my Android application and couldn’t get it running. Android could not find method ord.apache.commons.codec.binary.* and output the following errors in DDMS

01-12 08:41:48.161: ERROR/dalvikvm(457): Could not find method org.apache.commons.codec.binary.Base64.encodeBase64URLSafeString, referenced from method com.dqminh.app.util.Util.sendRequest

01-12 08:41:48.161: WARN/dalvikvm(457): VFY: unable to resolve static method 10146: Lorg/apache/commons/codec/binary/Base64;.encodeBase64URLSafeString ([B)Ljava/lang/String;

01-12 08:41:48.161: WARN/dalvikvm(457): VFY: rejecting opcode 0x71 at 0x0004

Any clue on how to solve this problem ? Thanks a lot.

Answer 1

I had a similar problem while using android with an OAuth library I’m developing.

I also got from android that, although I had included apache.commons.codec in the classpath, a particular method (encodeBase64String) was not found.

Checking the javadocs, both methods claim to be 1.4 and greater only, so my guess is that android already includes an older version of commons.codec where these methods are indeed undefined.

My solution was to use an older method, like this:

String encodedString = new String(Base64.encodeBase64('string to encode'));

The method you want to use is different since it replaces + and / with url-safe values – and _. So you probably might use something like:

String encodedString = new String(Base64.encodeBase64('string to encode'));
String safeString = encodedString.replace('+','-').replace('/','_');