Failed to find Platform SDK with path: platforms;android-P

Step 1: Open Preferences or Settings in Android studio. Select Android SDK options and Install Android API 28 as selected below.

Step 2: There's a problem with compileSdkVersion as you have to change it from 'android-P' to 28.

compileSdkVersion 28

And Build project. That's it.

To fully test your app's compatibility with Android P and begin using new APIs, open your module-level build.gradle file and update the compileSdkVersion and targetSdkVersion as shown here:

android {
    compileSdkVersion 28

    defaultConfig {
        targetSdkVersion 28
    }
    ...
}

Set Up the Android P SDK