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androidandroid-layoutandroid-linearlayoutandroid-constraintlayout

View get packed in ConstraintLayout, Views run out of screen in LinearLayout

I am implementing a signup/login screen like below

enter image description here

I have tried this using ConstraintLayout like below

<?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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_margin="16dp"
    tools:context=".MainActivity">

    <ImageView
        android:id="@+id/img"
        android:layout_width="250dp"
        android:layout_height="250dp"
        android:layout_marginBottom="72dp"
        android:src="@drawable/ic_launcher_background"
        app:layout_constraintBottom_toTopOf="@+id/btn1"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_chainStyle="packed" />

    <Button
        android:id="@+id/btn1"
        android:layout_width="0dp"
        android:layout_height="56dp"
        android:layout_marginStart="32dp"
        android:layout_marginEnd="32dp"
        android:layout_marginBottom="12dp"
        android:text="Button 1"
        app:layout_constraintBottom_toTopOf="@+id/btn2"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/img" />

    <Button
        android:id="@+id/btn2"
        android:layout_width="0dp"
        android:layout_height="56dp"
        android:layout_marginBottom="48dp"
        android:text="Button 2"
        app:layout_constraintBottom_toTopOf="@+id/txt_already_member"
        app:layout_constraintEnd_toEndOf="@+id/btn1"
        app:layout_constraintStart_toStartOf="@+id/btn1"
        app:layout_constraintTop_toBottomOf="@+id/btn1" />

    <TextView
        android:id="@+id/txt_already_member"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Already Member? Sign In"
        android:textSize="16sp"
        app:layout_constraintBottom_toTopOf="@+id/txt_agreement"
        app:layout_constraintEnd_toEndOf="@+id/btn2"
        app:layout_constraintStart_toStartOf="@+id/btn2"
        app:layout_constraintTop_toBottomOf="@+id/btn2" />

    <TextView
        android:id="@+id/txt_agreement"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="By continuing you agree to our terms and privacy policy"
        android:layout_marginTop="32dp"
        android:textSize="12sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

Summary of XML:

  • Vertical chain is applied on four top most views
  • vertical chain style is set to packed
  • last text view is constraint to bottom and sides
  • margin is set on views to separate items.

Problem is when I run this on my phone, bottom text views get tight packed as shown here.

Next I tried LinearLayout like below

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:gravity="center_horizontal"
    android:layout_margin="16dp"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/img"
        android:layout_width="250dp"
        android:layout_height="250dp"
        android:layout_marginBottom="72dp"
        android:layout_marginTop="72dp"
        android:src="@drawable/ic_launcher_background"/>

    <Button
        android:id="@+id/btn1"
        android:layout_width="match_parent"
        android:layout_height="56dp"
        android:layout_marginStart="32dp"
        android:layout_marginEnd="32dp"
        android:layout_marginBottom="8dp"
        android:text="Button 1" />

    <Button
        android:id="@+id/btn2"
        android:layout_width="match_parent"
        android:layout_marginStart="32dp"
        android:layout_marginEnd="32dp"
        android:layout_height="56dp"
        android:layout_marginBottom="32dp"
        android:text="Button 2" />

    <TextView
        android:id="@+id/txt_already_member"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Already Member? Sign In"
        android:textSize="16sp"
        android:layout_weight="1"/>

    <TextView
        android:id="@+id/txt_agreement"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="By continuing you agree to our terms and privacy policy "
        android:textSize="12sp"/>
</LinearLayout>

In this case bottom text views are not visible as shown here.

My device resolution is 720 * 1280 pixels.

I suppose the problem is with the hard margins. How could I make the screen look like in the sketch above, regardless of screen height? either using LinearLayout or ConstraintLayout?

Solution

  • Actually solution to my problem is using Guidelines in ConstraintLayout with Guidelines app:layout_constraintGuide_percentattribute and constraining the views to Guidelines.

    Since value for app:layout_constraintGuide_percent is a percentage rather than a dp value, it works responsively regardless of screen width/height.

    example :

    <?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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_margin="16dp"
    tools:context=".MainActivity">

    <ImageView
        android:id="@+id/img"
        android:layout_width="250dp"
        android:layout_height="200dp"
        android:src="@drawable/ic_launcher_background"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/guideline4" />

    <Button
        android:id="@+id/btn1"
        android:layout_width="match_parent"
        android:layout_height="56dp"
        android:layout_marginStart="20dp"
        android:layout_marginEnd="20dp"
        android:text="Button 1"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/guideline5" />

    <Button
        android:id="@+id/btn2"
        android:layout_width="match_parent"
        android:layout_height="56dp"
        android:layout_marginTop="8dp"
        android:layout_marginStart="20dp"
        android:layout_marginEnd="20dp"
        android:text="Button 2"
        app:layout_constraintEnd_toEndOf="@+id/btn1"
        app:layout_constraintStart_toStartOf="@+id/btn1"
        app:layout_constraintTop_toBottomOf="@+id/btn1" />

    <TextView
        android:id="@+id/txt_already_member"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:layout_marginBottom="16dp"
        android:text="Already Member? Sign In"
        android:textSize="16sp"
        app:layout_constraintBottom_toTopOf="@+id/txt_agreement"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/btn2" />

    <TextView
        android:id="@+id/txt_agreement"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="32dp"
        android:text="By continuing you agree to our terms and privacy policy "
        android:textSize="12sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent=".1" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent=".6" />


</androidx.constraintlayout.widget.ConstraintLayout>

    Thank you very much Rehan Sarwar for remembering me about Guidelines.