Android ConstraintLayout - Put one view on top of another view

Android ConstraintLayout - Put one view on top of another view

In Android's ConstraintLayout, placing one view on top of another can be achieved using constraints and the app:layout_constraintTop_toBottomOf attribute. Here's how you can overlay views in a ConstraintLayout:

Example Scenario

Let's say you have two views: view1 and view2, and you want view2 to be positioned on top of view1.

XML Layout 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" android:layout_width="match_parent" android:layout_height="match_parent"> <!-- View 1 --> <TextView android:id="@+id/view1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="View 1" app:layout_constraintTop_toTopOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintEnd_toEndOf="parent" android:background="@android:color/holo_blue_light" android:padding="16dp"/> <!-- View 2 (Overlay on top of View 1) --> <TextView android:id="@+id/view2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="View 2" app:layout_constraintTop_toBottomOf="@id/view1" app:layout_constraintStart_toStartOf="@id/view1" app:layout_constraintEnd_toEndOf="@id/view1" android:background="@android:color/holo_red_light" android:padding="16dp"/> </androidx.constraintlayout.widget.ConstraintLayout>

Explanation:

  1. View 1 (view1):

    • Positioned at the top of the parent using app:layout_constraintTop_toTopOf="parent".
    • Takes up the full width using app:layout_constraintStart_toStartOf="parent" and app:layout_constraintEnd_toEndOf="parent".
    • Has a blue background color (@android:color/holo_blue_light) for visibility.

  2. View 2 (view2):

    • Positioned below view1 using app:layout_constraintTop_toBottomOf="@id/view1".
    • Aligned horizontally with view1 using app:layout_constraintStart_toStartOf="@id/view1" and app:layout_constraintEnd_toEndOf="@id/view1".
    • Has a red background color (@android:color/holo_red_light) to indicate it's on top of view1.

Notes:

  • Ensure to replace TextView with your desired views (ImageView, Button, etc.) as per your application's requirements.
  • Adjust android:padding and other attributes (android:text, etc.) according to your design needs.
  • Use @id/view1 and @id/view2 to reference other views within the same ConstraintLayout.

This setup effectively places view2 on top of view1 by constraining view2 to be below view1 and aligning it with the same start and end constraints. Adjust the constraints and attributes based on your specific layout requirements and design.

Examples

  1. Android ConstraintLayout overlay view

    • Description: How to overlay one view on top of another using ConstraintLayout in Android.

    • Code:

      <androidx.constraintlayout.widget.ConstraintLayout ...> <ImageView android:id="@+id/imageView1" android:layout_width="wrap_content" android:layout_height="wrap_content" app:layout_constraintTop_toTopOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintBottom_toBottomOf="parent" android:src="@drawable/image1" /> <ImageView android:id="@+id/imageView2" android:layout_width="wrap_content" android:layout_height="wrap_content" app:layout_constraintTop_toTopOf="@id/imageView1" app:layout_constraintStart_toStartOf="@id/imageView1" app:layout_constraintEnd_toEndOf="@id/imageView1" app:layout_constraintBottom_toBottomOf="@id/imageView1" android:src="@drawable/image2" /> </androidx.constraintlayout.widget.ConstraintLayout>

    • Explanation: This XML layout places imageView2 on top of imageView1 within a ConstraintLayout, making imageView2 overlay imageView1.

  2. Android ConstraintLayout stack views

    • Description: Stack multiple views vertically or horizontally in ConstraintLayout with overlapping behavior.

    • Code:

      <androidx.constraintlayout.widget.ConstraintLayout ...> <ImageView android:id="@+id/imageView1" android:layout_width="wrap_content" android:layout_height="wrap_content" app:layout_constraintTop_toTopOf="parent" app:layout_constraintStart_toStartOf="parent" android:src="@drawable/image1" /> <ImageView android:id="@+id/imageView2" android:layout_width="wrap_content" android:layout_height="wrap_content" app:layout_constraintTop_toBottomOf="@id/imageView1" app:layout_constraintStart_toStartOf="@id/imageView1" android:src="@drawable/image2" /> </androidx.constraintlayout.widget.ConstraintLayout>

    • Explanation: imageView2 is positioned below imageView1 in the ConstraintLayout, appearing stacked on top due to the layout order.

  3. Android ConstraintLayout layering views

    • Description: How to layer views using ConstraintLayout with specific constraints to control their overlap.

    • Code:

      <androidx.constraintlayout.widget.ConstraintLayout ...> <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" app:layout_constraintTop_toTopOf="parent" app:layout_constraintStart_toStartOf="parent" android:text="TextView 1" /> <TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" app:layout_constraintTop_toTopOf="@id/textView1" app:layout_constraintStart_toStartOf="@id/textView1" android:text="TextView 2" /> </androidx.constraintlayout.widget.ConstraintLayout>

    • Explanation: textView2 is layered on top of textView1 by aligning it to textView1's top and start constraints within ConstraintLayout.

  4. Android ConstraintLayout overlap view

    • Description: Achieve view overlap effect using ConstraintLayout with specific layout constraints.

    • Code:

      <androidx.constraintlayout.widget.ConstraintLayout ...> <ImageView android:id="@+id/imageView1" android:layout_width="wrap_content" android:layout_height="wrap_content" app:layout_constraintTop_toTopOf="parent" app:layout_constraintStart_toStartOf="parent" android:src="@drawable/image1" /> <ImageView android:id="@+id/imageView2" android:layout_width="wrap_content" android:layout_height="wrap_content" app:layout_constraintTop_toTopOf="@id/imageView1" app:layout_constraintStart_toStartOf="@id/imageView1" android:src="@drawable/image2" /> </androidx.constraintlayout.widget.ConstraintLayout>

    • Explanation: imageView2 is overlaid on top of imageView1 within the ConstraintLayout, using the same start and top constraints.

  5. Android ConstraintLayout bring view to front

    • Description: How to bring a specific view to the front visually in a ConstraintLayout.

    • Code:

      <androidx.constraintlayout.widget.ConstraintLayout ...> <ImageView android:id="@+id/imageView1" android:layout_width="wrap_content" android:layout_height="wrap_content" app:layout_constraintTop_toTopOf="parent" app:layout_constraintStart_toStartOf="parent" android:src="@drawable/image1" /> <ImageView android:id="@+id/imageView2" android:layout_width="wrap_content" android:layout_height="wrap_content" app:layout_constraintTop_toTopOf="parent" app:layout_constraintStart_toStartOf="parent" android:src="@drawable/image2" /> </androidx.constraintlayout.widget.ConstraintLayout>

    • Explanation: imageView2 is placed before imageView1 in the layout XML, visually appearing above imageView1.

  6. Android ConstraintLayout z order views

    • Description: Control the z-order (front to back stacking order) of views in ConstraintLayout.

    • Code:

      <androidx.constraintlayout.widget.ConstraintLayout ...> <ImageView android:id="@+id/imageView1" android:layout_width="wrap_content" android:layout_height="wrap_content" app:layout_constraintTop_toTopOf="parent" app:layout_constraintStart_toStartOf="parent" android:src="@drawable/image1" /> <ImageView android:id="@+id/imageView2" android:layout_width="wrap_content" android:layout_height="wrap_content" app:layout_constraintTop_toTopOf="parent" app:layout_constraintStart_toStartOf="parent" android:src="@drawable/image2" /> </androidx.constraintlayout.widget.ConstraintLayout>

    • Explanation: imageView2 is positioned before imageView1 in the XML, so it appears in front due to the layout order.

  7. Android ConstraintLayout overlay text on image

    • Description: How to overlay text on top of an image using ConstraintLayout in Android.

    • Code:

      <androidx.constraintlayout.widget.ConstraintLayout ...> <ImageView android:id="@+id/imageView" android:layout_width="wrap_content" android:layout_height="wrap_content" app:layout_constraintTop_toTopOf="parent" app:layout_constraintStart_toStartOf="parent" android:src="@drawable/image" /> <TextView android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" app:layout_constraintTop_toTopOf="@id/imageView" app:layout_constraintStart_toStartOf="@id/imageView" android:text="Overlay Text" android:textColor="#FFFFFF" android:textSize="18sp" /> </androidx.constraintlayout.widget.ConstraintLayout>

    • Explanation: textView is overlaid on top of imageView, aligned to its top and start, creating an overlay effect.

  8. Android ConstraintLayout position view on top

    • Description: Position one view on top of another in ConstraintLayout without affecting their stacking order.

    • Code:

      <androidx.constraintlayout.widget.ConstraintLayout ...> <ImageView android:id="@+id/imageView1" android:layout_width="wrap_content" android:layout_height="wrap_content" app:layout_constraintTop_toTopOf="parent" app:layout_constraintStart_toStartOf="parent" android:src="@drawable/image1" /> <ImageView android:id="@+id/imageView2" android:layout_width="wrap_content" android:layout_height="wrap_content" app:layout_constraintTop_toTopOf="@id/imageView1" app:layout_constraintStart_toStartOf="@id/imageView1" android:src="@drawable/image2" /> </androidx.constraintlayout.widget.ConstraintLayout>

    • Explanation: imageView2 is positioned on top of imageView1 by aligning it to imageView1's top and start constraints.

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