Using this snippet in gradle will copy the apk to dropbox folder (you can change the path wherever you want it to export) and renames it with current svn revision of the project. Add this in "buildTypes" - parallel to "dependencies".

Custom Gradle Build Script for exporting APKs with svn version in name

 release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'


            applicationVariants.all { variant ->
                variant.outputs.each { output ->
                    def outputFile = output.outputFile
//                    println()

                    def result

                    new ByteArrayOutputStream().withStream { os ->
                        result = exec {
//                            executable = 'svnversion'
//                            args = '| cut -d : -f 2 | cut -d M -f 1'
                            commandLine 'svn_script.sh'
//                            args '| cut -d : -f 2 | cut -d M -f 1'

                            standardOutput = os
                        }
                        result = os.toString().trim()
                    }

                    def app_name = project.rootDir.name.replace(" ", "_")
                    def final_apk_name = app_name + "_rev" + result + ".apk"
                    println("Final build: " + final_apk_name)
                    println("outputFile.parent:  " + outputFile.parent)
                    def dropbox_path = "/home/ayush/Dropbox/AutomaticBuilds/" + app_name

                    if (outputFile != null && outputFile.name.endsWith('.apk')) {
//                        def fileName = outputFile.name.replace('app-debug.apk', final_apk_name)
//                        output.outputFile = new File(dropbox_path, fileName)
//                    }

                        // now lets copy it to somewhere else

                        def originApkFile = output.outputFile;
                        def renameApkFile = originApkFile.name.replace('app-debug.apk', final_apk_name)
                        copy {
                            from "$originApkFile"
                            into "$dropbox_path"
                            rename("$originApkFile.name", "$renameApkFile")
                        }

                        // now delete original apk

//                        project.delete "$renameApkFile"

//

                    }


                }
            }

        }