Why TextView's margin not working in ConstraintLayout-CodePudding

My id/ambient_check_text's marginStart/marginEnd not working, I tested in real device. It looks like below:

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:layout_width="match_parent"
    android:layout_height="wrap_content">


    <TextView
        android:id="@ id/ambient_title_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="20dp"
        android:layout_marginTop="10dp"
        android:layout_marginEnd="16dp"
        android:layout_weight="1"
        android:alpha="0.80"
        android:drawableEnd="@drawable/vip_detail_activity_ic_pro"
        android:singleLine="true"
        android:text="@string/ambient_detail_title"
        android:textColor="@color/white"
        android:textSize="16sp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <util.TopCropImageView
        android:id="@ id/ambient_permission_bg"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="10dp"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="10dp"
        android:adjustViewBounds="true"
        android:scaleType="fitXY"
        android:src="@drawable/ambient_detail_permission_bg"
        app:layout_constraintTop_toBottomOf="@id/ambient_title_text"
        tools:ignore="ContentDescription" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="8dp"
        android:alpha="0.80"
        android:background="@drawable/ambient_detail_decibels_bg"
        android:paddingStart="8dp"
        android:paddingTop="2dp"
        android:paddingEnd="8dp"
        android:paddingBottom="2dp"
        android:text="@string/ambient_detail_decibels_for_sleep_25db"
        android:textColor="@color/white"
        android:textSize="14sp"
        app:layout_constraintEnd_toEndOf="@id/ambient_permission_bg"
        app:layout_constraintTop_toTopOf="@id/ambient_permission_bg" />

    <TextView
        android:id="@ id/ambient_quick_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="20dp"
        android:background="@drawable/ambient_detail_quick_view_bg"
        android:paddingStart="16dp"
        android:paddingTop="5dp"
        android:paddingEnd="16dp"
        android:paddingBottom="5dp"
        android:text="@string/ambient_detail_quick_view"
        android:textColor="@color/white"
        app:layout_constraintBottom_toBottomOf="@id/ambient_permission_bg"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

    <TextView
        android:id="@ id/ambient_check_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="10dp"
        android:layout_marginTop="10dp"
        android:layout_marginEnd="10dp"
        android:layout_marginBottom="10dp"
        android:alpha="0.80"
        android:text="12312313123123123123123123@string/ambient_detail_check_to_see"
        android:textColor="@color/white"
        app:layout_constraintBottom_toTopOf="@id/ambient_quick_view"
        app:layout_constraintEnd_toEndOf="@id/ambient_permission_bg"
        app:layout_constraintStart_toStartOf="@id/ambient_permission_bg" />

</androidx.constraintlayout.widget.ConstraintLayout>

UPDATE1:

My id/ambient_quick_view not working as I expected as well, as in some language it is 'quick view' or 'a long version of some language quick view', I tested in real device. (I think I actually expect wrap_content behave, and marginStart behave at the same time, maybe I should not use ContraintLayout.)

CodePudding user response：

Because you applied wrap_text as textview's width. wrap_content takes as much width as required based on content even though you applied horizontal constraints.

Change it to 0dp.

<TextView
        android:id="@ id/ambient_check_text"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="10dp"
        android:layout_marginTop="10dp"
        android:layout_marginEnd="10dp"
        android:layout_marginBottom="10dp"
        android:alpha="0.80"
        android:text="12312313123123123123123123@string/ambient_detail_check_to_see"
        android:textColor="@color/white"
        app:layout_constraintBottom_toTopOf="@id/ambient_quick_view"
        app:layout_constraintEnd_toEndOf="@id/ambient_permission_bg"
        app:layout_constraintStart_toStartOf="@id/ambient_permission_bg" />

CodePudding user response：

Change this

android:layout_width="wrap_content"

android:layout_width="0dp"

In ConstraintLayout, whenever we apply constraint, we need to work with 0dp, if vertical (0dp to height) & if horizontal (0dp to width)