This worked for me.. Will work for you for sure.
step 1: Delete "only" the Gradle "folder" from your project folder.
step 2: Import your project from Android Studio & a dialog box will appear "press
Ok to use..., or Cancel to... ". Press "Cancel" & locate the path where you have downloaded the latest Gradle File (C:/Gradle/gradle-3.5 ,in my case).
Step 3: it will give an error saying that "no cache version for....". So now check which version of com.android.tools.build:gradle: you have.. so check the path "C:\Program Files\Android\Android Studio\gradle\m2repository\com\android\tools\build\gradle" and select the latest version (2.3.2 in my case). So now, go to Gradle Scripts-> build.gradle(android) in Android Studio and change the dependencie's classpath to (classpath 'com.android.tools.build:gradle:2.3.2')in my case
step 4: Click on "try again". Then it'll ask for upgrading tools, upgrade it by clicking on it & then you're done..
Congrats, your Project is successfully built..
And yeah make sure that In Setting-> Build,Exec...->Gradle-> "check mark on Use local gradle distribution & offline work & Gradle home: C:/Gradle/gradle-3.5 & Service directory path: C:/Gradle/gradle-3.5 (in my case).