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This is my layout file.
<?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">
<EditText
android:layout_width="150dp"
android:layout_height="50dp"
android:hint="please input test content"
android:inputType="phone"
android:textColorHint="@android:color/holo_red_light"
android:textSize="13sp"
app:layout_constraintBottom_toTopOf="parent"
app:layout_constraintRight_toLeftOf="parent" />
<TextView
android:layout_width="80dp"
android:layout_height="50dp"
android:gravity="center"
android:text="Hello"
android:textColor="@android:color/black"
app:layout_constraintBottom_toTopOf="parent"
app:layout_constraintHorizontal_bias="0.5" />
</android.support.constraint.ConstraintLayout>
Follow pic is preview view.
I want to move TextView to center_horizontal to parent view , but layout_constraintHorizontal_bias=0.5" seems not work.
Who has ideas for this problem ? Thanks for first !
880
This one is what makes ConstraintLayout that powerful. You can position elements relatively with each other (just like in RelativeLayout). Constraints could be either another view or directly the parent. Let’s see it in action. With the help of these constraint properties, you can align elements the way you like without having nested layouts.
This tells the system that we want the left side of button B to be constrained to the right side of button A. Such a position constraint means that the system will try to have both sides share the same location. Here is the list of available constraints (Fig. 2):
“Gone Margin” is introduced with ConstraintLayout to solve this issue. Imagine that you have a hierarchy as shown above. You want to make A’s visibility GONE. When A is GONE, B will automatically slide to A’s position. In order to prevent that you can give gone_margin to the related direction.
Relative positioning is one of the basic building blocks of creating layouts in ConstraintLayout. Those constraints allow you to position a given widget relative to another one. You can constrain a widget on the horizontal and vertical axis: Horizontal Axis: left, right, start and end sides
Try this
<?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">
<EditText
android:id="@+id/editText2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="16dp"
android:ems="10"
android:hint="please input test content"
android:inputType="phone"
android:textColorHint="@android:color/holo_red_light"
android:textSize="13sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
<TextView
android:layout_width="80dp"
android:layout_height="50dp"
android:gravity="center"
android:text="Hello"
android:textColor="@android:color/black"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
EDIT
to use bias you need to give constrained it to any parent.
64
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