Building An Apk File

I just done with coding in my application , it runs ok without any problem but I stuck in building the apk I want to make my apk file , gradle make some errors and I don't know ho

Solution 1:

It happens when the versions of SDK, Build Tools and Gradle Plugins doesn't match. The solution is to verify if you are using the latest versions of them. The gradle plugins are placed in the build.gradle file of the project. Other versions are in the build.gradle file of the module. For example, for SDK 23, you must use the Build Tools 23.0.1 and gradle plugins version 1.3.1.

Please refer this and this questions.