No Java files found which extend CordovaActivity. when use "cordova build"
Solution 1:
I had the same error when I cloned my repository from another project. I solved it by removing the platforms and adding it again.
remove : cordova platform rm android
add : cordova platform add android
Solution 2:
All you need to do is remove platform cordova platform rm android and re-add platform by typing cordova platform add android, and the error goes away
Solution 3:
In Eclipse or another editor, go into the .java source file under platforms/android/src/ and make sure the class extends CordovaActivity (it may have previously extended DroidGap instead).