Android Studio: What is the right way to change targetSdkVersion?

Question

I want to change the targetSdkVersion from 19 to 18 in Android Studio (not Eclipse), but failed.

Android Studio complains the following after I changed the targetSdk

Answer 1

in build.gradle Change these values according to current project Updation in sdk manager

compileSdkVersion 25 buildToolsVersion "25.0.2" minSdkVersion 15 targetSdkVersion 25

in dependencies replace below code
compile 'com.android.support:appcompat-v7:25.1.0'

and synchronise project