A solution to Challenge: Reporting the Device’s Android Version

Android Programming (4th Edition) 7. Android SDK Versions and Compatibility
1 
  //  activity_cheat.xml
    <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/api_level"
            tools:text="Api level" >

        </TextView>

// CheatActivity.kt in OnCreate 

val apiLevel : TextView = findViewById(R.id.api_level)
        val buildNumber = Build.VERSION.SDK_INT.toString()
        apiLevel.text = "API Level:  $buildNumber"
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3

I have got warning :
do not concatenate text displayed with settext. use resource string with placeholders.
so I fix this like that:

//  activity_cheat.xml
    <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/api_level"/>

        </TextView>

// CheatActivity.kt in OnCreate 

val apiLevel : TextView = findViewById(R.id.api_level)
        val buildNumber = Build.VERSION.SDK_INT.toString()
        apiLevel.text = getString(R.string.api_level, buildNumber)

and in strings.xml 
<string name="api_level">Api Level %1$S</string>