Sprinner doesn't appear in Constraint Layout [Solved]

Issue

This is my first time using the spinner so I was following tutorials. I was making spinner that will showcase the objects name.

Edit_Form Activity :

class Edit_Form : AppCompatActivity() {
    private lateinit var mySpinner: Spinner
    private lateinit var adapter: ArrayAdapter<Plant_Category>
    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_edit__form)
        mySpinner = findViewById(R.id.spinner3)

        val customObjects = getCustomObjects()
        adapter = ArrayAdapter(this, android.R.layout.simple_spinner_item, customObjects)

        mySpinner.adapter = adapter
    }

    private fun getCustomObjects(): ArrayList<Plant_Category> {
        val customObjects = ArrayList<Plant_Category>()
        customObjects.apply {
            add(Plant_Category(1, "Strawberry","2 times a day","Water more in summer, Can cause irritation to cats"))
            add(Plant_Category(2, "Aloe","2 times a week","Water more in summer, Is not safe to digest for pets"))
            add(Plant_Category(3, "Money tree", "1-2 times a week","Needs medium to bright indirect light, Safe for pets"))

        }
        return customObjects
    }
}

Layout:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/linearLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".activity.Edit_Form" >

    <EditText
        android:id="@+id/plant_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="100dp"
        android:layout_marginLeft="100dp"
        android:layout_marginTop="135dp"
        android:layout_marginEnd="101dp"
        android:layout_marginRight="101dp"
        android:layout_marginBottom="551dp"
        android:ems="10"
        android:inputType="textPersonName"
        android:text="@string/edit_name"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:autofillHints="" />

    <Spinner
        android:id="@+id/spinner3"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_marginStart="60dp"
        android:layout_marginLeft="60dp"
        android:layout_marginTop="73dp"
        android:layout_marginEnd="80dp"
        android:layout_marginRight="80dp"
        android:layout_marginBottom="454dp"
        android:dropDownHeight="100dp"
        android:dropDownWidth="match_parent"
        android:prompt="@string/edit_type"
        android:spinnerMode="dropdown"
        android:theme="@style/ThemeOverlay.AppCompat.Light"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/plant_name" />
</androidx.constraintlayout.widget.ConstraintLayout>

Data Class:

data class Plant_Category(
        var id: Int =0,
        var type:String ="" ,
        var water_time: String ="",
        var details: String = ""){

    override fun toString(): String {
        return type
    }
}

The problem is that Spinner shows in the Design mode but it doesn't appear in emulator only the input field appears. I also changed the background color to see perhaps the spinner went to the corner or something but it's still doesn't show.

Perhaps there is a problem in measurements in Constraint Layout or how I implement it?

I will be grateful for your help.

Solution

You need to remove layout_margin on both <EditText> and <Spinner>. Then the sprinner should appear in Constraint Layout

Answered By - MayWheather