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Android Build a Simple Android App with Kotlin Improving Our Code Dynamically Changing the Background Color

Enyang Mercy
PLUS
Enyang Mercy
Courses Plus Student 2,339 Points
Posted by Enyang Mercy
Enyang Mercy
Courses Plus Student 2,339 Points

Android(Kotlin) set backgroundColor for relativeLayout

Help!!!!!!!!!!!!! ERROR: Bummer! MealActivity.kt:14:5: error: unresolved reference: relativeLayout relativeLayout!!.setBackgroundColor(Color.GREEN) I dunno what is wrong with my line of code. Pls help with possible answers

MealActivity.kt 
import android.app.Activity
import android.os.Bundle
import android.widget.TextView
import android.widget.RelativeLayout

class MealActivity : Activity() {

  override fun onCreate(savedInstanceState: Bundle) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_meal)

    val foodLabel = findViewById(R.id.foodTextView) as TextView
    val drinkLabel = findViewById(R.id.drinkTextView) as TextView
    relativeLayout!!.setBackgroundColor(Color.GREEN)
  }
}

2 Answers

Dave Harker
PLUS
Dave Harker
Courses Plus Student 15,510 Points
Dave Harker
Dave Harker
Courses Plus Student 15,510 Points

Hi Enyang Mercy,

For some reason it looks like you've deleted part of the challenge code 

val mealLayout = findViewById(R.id.mealLayout) as RelativeLayout

So either tack that back in or restart the challenge to get it back. Moving on, the relative layout is the mealLayout, so just set the background on that after you add it back in.

mealLayout.setBackgroundColor(Color.GREEN)

Best of luck, and happy coding, :dizzy:
Dave