CODEWITHSUNDEEP
androidbackgroundandroid-constraintlayout
RAMU PAL
RAMU PAL

Reputation: 99

set background when using constraint layout

I am using constraint layout as parent, and added multiple child using constraint. There are three views horizontally and I have to apply rounded corner background for two view only, which was achieved by linear layout previously. But with the help of constraint layout, I am not able to achieve this.

How can I achieve this?

enter image description here

Upvotes: 7

Views: 8494

Answers (2)

Hitesh Sahu
Hitesh Sahu

Reputation: 45090

You can do it with simple Image View following this steps:

  • Put a Image view before text views

  • set Image view's start, top constraint to match first text view

  • Set Image view's end & bottom constraint to match last text views

    This will gone stretch that imageview to a Rectangle defined by top-left of first view and bottom-right of last view.

    Note that ImageView must be before text views:

         <!--Background Image View-->
  <ImageView
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:background="@drawable/lake"
        app:layout_goneMarginRight="@dimen/activity_vertical_margin"

        <!--Top_LEFT by first view-->
        app:layout_constraintStart_toStartOf="heding"
        app:layout_constraintTop_toTopOf="@+id/heding"

        <!--BOTTOM RIGHT by last view-->
        app:layout_constraintEnd_toEndOf="@+id/info"
        app:layout_constraintBottom_toBottomOf="@+id/info"
        />

        <!--first view-->
    <TextView
        android:id="@+id/heding"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="8dp"
        android:text="Lake Tahoe "
        android:textSize="17sp"
        android:textStyle="bold"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.05"
        app:layout_constraintStart_toEndOf="@+id/thumb"
        app:layout_constraintTop_toTopOf="@+id/thumb"
        tools:layout_constraintBottom_creator="1"
        android:textColor="#FFF"
        tools:layout_constraintTop_creator="1" />

        <!--last view-->

    <TextView
        android:id="@+id/info"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="8dp"
        android:text="LakeTahoe is a large freshwater lake in Sierra Naveda"
        android:textSize="15sp"
        android:textColor="#FFF"
        app:layout_constraintBottom_toBottomOf="@+id/thumb"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.05"
        app:layout_constraintStart_toEndOf="@+id/thumb"
        app:layout_constraintTop_toBottomOf="@+id/heding"
        app:layout_constraintVertical_bias="1.0"
        tools:layout_constraintLeft_creator="1"
        tools:layout_constraintRight_creator="1"
        tools:layout_constraintTop_creator="1" />

Result:

enter image description here

Upvotes: 0

Udit
Udit

Reputation: 1037

ConstraintLayout recently introduced the concept of constrainthelper which can be used to perform an action on a group of views. 'Group', which is used to toggle visibility of multiple view is subclass of this.

A constrainthelper which changes background of multiple views together is not yet a part of the stable release, but soon will be.

Until then, you can achieve a backround as in the example below, where 3 textview share a common background, using an View class:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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:background="#AAA">

  <View
    android:id="@+id/background"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:background="#FFF"
    app:layout_constraintBottom_toBottomOf="@+id/textView3"
    app:layout_constraintEnd_toEndOf="@+id/textView1"
    app:layout_constraintStart_toStartOf="@+id/textView1"
    app:layout_constraintTop_toTopOf="@+id/textView1" />

  <TextView
    android:id="@+id/textView1"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_margin="8dp"
    android:padding="8dp"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    tools:text="TextView" />

  <TextView
    android:id="@+id/textView2"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:padding="8dp"
    app:layout_constraintEnd_toEndOf="@+id/textView1"
    app:layout_constraintStart_toStartOf="@+id/textView1"
    app:layout_constraintTop_toBottomOf="@+id/textView1"
    tools:text="TextView" />

  <TextView
    android:id="@+id/textView3"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:padding="8dp"
    app:layout_constraintEnd_toEndOf="@+id/textView1"
    app:layout_constraintStart_toStartOf="@+id/textView1"
    app:layout_constraintTop_toBottomOf="@+id/textView2"
    tools:text="TextView" />
</android.support.constraint.ConstraintLayout>

EDIT: A nice blog on what to expect from ConstraintLayout 2.0

Upvotes: 8

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