Android Constraint Layout alignemnt

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Im facing an issue with ConstraintLayout.

I have a view which has 3 textviews T1, T2 and T3.

Precondition: T1,T2 is having 4dp margin top.

Problem: T3 needs to be top should be aligned to topmost view. Condition is T1 will be visible or gone based on certain condition. If T1 is visible the margintop will be 8dp and when T1 is not visible T2 will have 12dp margintop.

<?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">
<TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:text="T1"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textView9"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="4dp"
        android:text="T2"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView" />


    <TextView
        android:id="@+id/textView10"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:text="T3"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="@+id/textView" />


</android.support.constraint.ConstraintLayout>

Is this possible by XML or I need to configure programmatically?

You can't achieve this only with XML, what you did is create a screen using constraint layout. If you want to add some logic to change the position of some view under certain conditions you will have to write it programmatically.Here is a good thread about the subject.

Align views right in ConstraintLayout without clipping, A Constraint is essentially a defined rule for a view which declares it's positioning and alignment on screen, the ConstraintLayout class� The horizontal bias controls the position within the two horizontal constraints the View will be positioned: a value of 0.0 will position it alined to the start; a value of 0.5 (the default) will centre it between the start and end; and a value of 1.0 will align it to the end. It is this last case that we’re after.

I don't know exactly your use case,but you can achieve this setting view to invisible instead of gone.

View.GONE This view is invisible, and it doesn't take any space for layout purposes.

View.INVISIBLE This view is invisible, but it still takes up space for layout purposes.

Exploring the new Android ConstraintLayout, A ConstraintLayout is a ViewGroup which allows you to position and size widgets in Vertically, these views are center aligned in their parent. post ) if you just felt a lot more powerful as a modern day Android Developer. Constraint Layout Tutorial With Example In Android Studio [Step by Step] Constraint Layout is a ViewGroup (i.e. a view that holds other views) which allows you to create large and complex layouts with a flat view hierarchy, and also allows you to position and size widgets in a very flexible way. It was created to help reduce the nesting of views and also improve the performance of layout files.

You can use layout_goneMarginTop to have a different margin when your view is GONE.

You can also use SequenceLayout for better flexibility on managing your layout. Use visibilityElement on each Span you want to be gone when your related view is gone.

Getting your constraints right — ConstraintLayout, Centring is usually done on a view which has an intrinsic size defined by android: layout_[width|height]="wrap_content" . All of the examples will follow that� layout_constraintLeft_toLeftOf — Align the left of the desired view to the left of another. layout_constraintLeft_toRightOf — Align the left of the desired view to the right of another.

Centring, If you are using an old version of Android Studio and don't see the guideline create a constraint from an anchor point of any view in the layout and align it to� ConstraintLayout is a layout on Android that gives you adaptable and flexible ways to create views for your apps. ConstraintLayout, which is now the default layout in Android Studio, gives you many ways to place objects. You can constrain them to their container, to each other or to guidelines.

Guidelines, Whenever you use alignment controls from the menu, such as Align Horizontal Centers, Android Studio is actually applying a chain. loadParameters(ConstraintSet.Constraint constraint, HelperWidget child, ConstraintLayout.LayoutParams layoutParams, mapIdToWidget) void: removeView(View view) Remove a given view from the helper. void: resolveRtl(ConstraintWidget widget, boolean isRtl) void: setAllowsGoneWidget(boolean supportGone) void: setDpMargin(int margin)

ConstraintLayout Tutorial for Android: Complex Layouts , One hacky way of achieving this in ConstraintLayout is to define a Guideline at a specific offset from the start of the parent, and align the end of� The Layout Editor uses ConstraintLayoutto determine the position of a UI element. A constraint represents a connection or alignment to another view, the parent layout, or an invisible guideline.