How to use ratios to size views in a ConstraintLayout using Kotlin Android

How to use ratios to size views in a ConstraintLayout using Kotlin Android.

Here is a detailed step-by-step tutorial on how to use ratios to size views in a ConstraintLayout using Kotlin in Android.

1. Start by creating a new Android project in Android Studio or open an existing project where you want to use ratios for sizing views.

2. Open the XML layout file where you want to use ratios. Make sure you are using a ConstraintLayout as the root layout.

3. Define the views that you want to size using ratios. For example, let's say you have two TextViews that you want to size in a 2:1 ratio. Define the views in the XML layout file as follows:

<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/textView1"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:text="TextView 1"
        app:layout_constraintDimensionRatio="2:1"
        app:layout_constraintBottom_toTopOf="@+id/textView2"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:text="TextView 2"
        app:layout_constraintDimensionRatio="2:1"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView1" />

</androidx.constraintlayout.widget.ConstraintLayout>

4. In the above example, we have set the layout_width and layout_height attributes of the TextViews to 0dp. This is because we will be using the constraint ratios to size the views.

5. The app:layout_constraintDimensionRatio attribute is used to specify the ratio for sizing the views. In this case, we have set it to 2:1 for both TextViews.

6. The app:layout_constraintBottom_toTopOf and app:layout_constraintTop_toBottomOf attributes are used to set the vertical constraints for the views. In this example, we have set the bottom of textView1 to the top of textView2, and the top of textView2 to the bottom of textView1.

7. The app:layout_constraintEnd_toEndOf and app:layout_constraintStart_toStartOf attributes are used to set the horizontal constraints for the views. In this example, we have set both TextViews to be constrained to the start and end of the parent layout.

8. Build and run the app to see the TextViews sized according to the specified ratio.

That's it! You have successfully used ratios to size views in a ConstraintLayout using Kotlin in Android. You can use this approach to size other views as well by adjusting the ratio and constraints according to your requirements.