Is there any reason why the following layout_marginBottom is not working?
However, if I use layout_marginTop on the second view it does work well
<android.support.constraint.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"
android:background="#ade4ad">
<TextView
android:id="#+id/first"
android:layout_width="90dp"
android:layout_height="40dp"
app:layout_marginBottom="10dp"
android:background="#000"/>
<TextView
android:id="#+id/second"
android:layout_width="90dp"
android:layout_height="40dp"
android:background="#fff"
app:layout_constraintTop_toBottomOf="#+id/first"/>
</android.support.constraint.ConstraintLayout>
In order to
android:layout_marginBottom="20dp"
work well, you should use
app:layout_constraintBottom_toBottomOf="parent"
Layout top/bottom margin works only when:
constraints in the same direction need to connect with their next neighbor child, like a unidirectional linked list.
last constraint in the direction must be set.
In your case, you need to set "layout_constraintBottom_toXXXXX" for each view in the chain, and last view set bottom to parent.
<android.support.constraint.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="wrap_content"
android:background="#ade4ad">
<TextView
android:id="#+id/first"
android:layout_width="90dp"
android:layout_height="40dp"
app:layout_marginBottom="10dp"
app:layout_constraintBottom_toTopOf="#+id/second"
android:background="#000"/>
<TextView
android:id="#+id/second"
android:layout_width="90dp"
android:layout_height="40dp"
app:layout_marginBottom="10dp"
app:layout_constraintBottom_toTopOf="#+id/third"
android:background="#fff"/>
<TextView
android:id="#+id/third"
android:layout_width="90dp"
android:layout_height="40dp"
android:background="#fff"
app:layout_constraintBottom_toBottomOf="parent"/>
</android.support.constraint.ConstraintLayout>
Moreover, reverse dependency is not required except you want "layout_marginTop" works.
you can use that trick, create a space bellow, align to parent bottom
<Space
android:id="#+id/space"
android:layout_width="wrap_content"
android:layout_height="80dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
and align your view on top of the space
app:layout_constraintBottom_toTopOf="#+id/space"
like so
<TextView
android:id="#+id/howNext"
style="#style/white_action_btn_no_border"
android:layout_width="344dp"
android:layout_height="60dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:text="#string/got_it_next"
app:layout_constraintBottom_toTopOf="#+id/space"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
This is not LinearLayout or RelativeLayout, its ConstraintLayout so you have to give Left, Right, Bottom, Top Constraint to Relevant Layout, in your case You have to give TextView first Bottom_Top Constraint to TextView second. so you can get Margin between Two TextView.
Your layout should be like below.
<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="#ade4ad">
<TextView
android:id="#+id/first"
android:layout_width="90dp"
android:layout_height="40dp"
android:background="#000"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintLeft_toLeftOf="parent" />
<TextView
android:id="#+id/second"
android:layout_width="90dp"
android:layout_height="40dp"
android:background="#fff"
android:layout_marginTop="10dp"
app:layout_constraintTop_toBottomOf="#+id/first"
app:layout_constraintLeft_toLeftOf="#+id/first"
app:layout_constraintRight_toRightOf="#+id/first" />
</android.support.constraint.ConstraintLayout>
Related
I have two TextViews, one above the other. I would like the vertical middle of the two TextViews to be at the same position as the vertical middle of the ImageView. (This is so, regardless of the amount of text that may go into either TextView, everything will always look neat, vertically.)
I created what I need perfectly using two LinearLayouts (as the space above the title is the same as the space beneath the description):
But Android Studio was unable to covert it to ConstraintLayout successfully, as it just dumped the TextViews at the bottom of the layout. I've played with a lot of attributes, but could not quite arrive at the desired layout.
My question is similar to this one, except that I am trying to center_vertical align a pair of views rather than a single one - which means I have no view edge to align to the centre of the ImageView/container.
Is it possible to achieve what I'm after with ConstraintLayout? (I expect I may be able to do it with a single RelativeLayout, but I would like to use the layout_constraintDimensionRatio attribute on my ImageView which presumably leave me needing to use ConstraintLayout.)
In case it helps, here's the code for my aforementioned LinearLayout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
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"
android:orientation="horizontal">
<ImageView
android:id="#+id/imageView"
android:layout_width="#dimen/resources_list_image_size"
android:layout_height="#dimen/resources_list_image_size"
android:layout_marginEnd="#dimen/activity_horizontal_margin"
android:layout_marginRight="#dimen/activity_horizontal_margin"
android:layout_gravity="center_vertical"
android:contentDescription="#string/resource_image"
android:scaleType="centerCrop"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:orientation="vertical">
<TextView
android:id="#+id/textViewTitle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAppearance="#style/MyTextAppearanceMedium"
tools:text="Title" />
<TextView
android:id="#+id/textViewDescription"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAppearance="#style/MyTextAppearanceSmall"
tools:text="Description" />
</LinearLayout>
</LinearLayout>
Update: Solution
Thanks to Ben P's answer, this is my final code:
<?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">
<!-- Add guideline to align imageView to. -->
<androidx.constraintlayout.widget.Guideline
android:id="#+id/guideline"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.3" />
<ImageView
android:id="#+id/imageView"
android:layout_width="0dp"
android:layout_height="0dp"
android:contentDescription="#string/resource_image"
android:scaleType="centerCrop"
app:layout_constraintDimensionRatio="H,1:1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="#id/guideline"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"/>
<TextView
android:id="#+id/textViewTitle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="#dimen/activity_horizontal_margin"
android:layout_marginLeft="#dimen/activity_horizontal_margin"
app:layout_constraintBottom_toTopOf="#id/textViewDescription"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#id/imageView"
app:layout_constraintTop_toTopOf="parent"
android:textAppearance="#style/MyTextAppearanceMedium"
app:fontFamily="#font/roboto_slab_regular"
app:layout_constraintVertical_chainStyle="packed"
tools:text="#string/enter_title_colon" />
<TextView
android:id="#+id/textViewDescription"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="#dimen/activity_horizontal_margin"
android:layout_marginLeft="#dimen/activity_horizontal_margin"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#id/imageView"
app:layout_constraintTop_toBottomOf="#id/textViewTitle"
app:fontFamily="#font/roboto_slab_light"
android:textAppearance="#style/MyTextAppearanceSmall"
tools:text="Description" />
</androidx.constraintlayout.widget.ConstraintLayout>
It sounds like you could solve this problem by using a packed chain anchored to the top and bottom of the ImageView. You'll also need to use horizontal bias and a constrained width in order to get wrapping to work correctly.
<?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="match_parent">
<View
android:id="#+id/anchor"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_margin="64dp"
android:background="#caf"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
<TextView
android:id="#+id/one"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintVertical_chainStyle="packed"
app:layout_constraintHorizontal_bias="0"
app:layout_constrainedWidth="true"
app:layout_constraintTop_toTopOf="#id/anchor"
app:layout_constraintStart_toEndOf="#id/anchor"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintBottom_toTopOf="#id/two"/>
<TextView
android:id="#+id/two"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintHorizontal_bias="0"
app:layout_constrainedWidth="true"
app:layout_constraintTop_toBottomOf="#id/one"
app:layout_constraintStart_toEndOf="#id/anchor"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintBottom_toBottomOf="#id/anchor"/>
</androidx.constraintlayout.widget.ConstraintLayout>
The important attributes here are:
app:layout_constraintVertical_chainStyle="packed" on the first view, which causes the two textviews to stack right on top of each other
app:layout_constraintHorizontal_bias="0" on both views, which means that when the text is not long enough to reach the edge of the screen it will stick to the edge of the anchor view
app:layout_constrainedWidth="true" on both views, which prevents the textview from ever being wider than its constraints, and so the text wraps to a new line
If you want to use ConstraintLayout you could use something like this:
<?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="match_parent">
<ImageView
android:id="#+id/imageView"
android:layout_width="200dp"
android:layout_height="200dp"
android:contentDescription="description"
android:scaleType="centerCrop"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<LinearLayout
android:id="#+id/linearLayout"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintBottom_toBottomOf="#+id/imageView"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/imageView"
app:layout_constraintTop_toTopOf="#+id/imageView">
<TextView
android:id="#+id/textViewTitle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:text="Title" />
<TextView
android:id="#+id/textViewDescription"
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:text="Description" />
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
You can use this layout:
<?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/textView2"
android:layout_width="0dp"
android:layout_height="0dp"
android:background="#color/colorAccent"
android:text="I am 5% of the screen height"
app:layout_constraintBottom_toTopOf="#+id/textView3"
app:layout_constraintEnd_toEndOf="#+id/textView3"
app:layout_constraintHeight_percent="0.05"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="#+id/textView3"
app:layout_constraintTop_toTopOf="#+id/imageView2" />
<TextView
android:id="#+id/textView3"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintHeight_percent="0.15"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:background="#color/colorPrimary"
android:text="I am 15% of the screen height (And the image is 20% screen size in height) "
app:layout_constraintBottom_toBottomOf="#+id/imageView2"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/imageView2"
app:layout_constraintTop_toBottomOf="#+id/textView2" />
<ImageView
android:id="#+id/imageView2"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintHeight_percent="0.20"
app:layout_constraintDimensionRatio="1:1"
android:scaleType="fitXY"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="#drawable/rose" />
</android.support.constraint.ConstraintLayout>
It will look like this:
One important thing about this layout:
You can control your aspect ratio (for the image) with app:layout_constraintDimensionRatio="x:y" and by passing "1:1" make it square
And by the way - I am using support library for no reason on this example, you can use androidx
I am doing a constraint layout for screen. And in some small screens is not showing correctly, because the button is over the text.
In the other devices with a bigger screen is showing correctly.
And i don't know how i can solve it.
Thanks
This is my layout (Constraint Layout) with a Linear layout inside.
<?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="#color/wf_white">
<LinearLayout
android:id="#+id/ly_container"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="#dimen/form_margins"
android:orientation="vertical"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="parent"
android:background="#color/wf_light_grey">
<TextView
style="#style/wf_text_link"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:textAllCaps="true"
android:layout_marginTop="#dimen/form_margins"
android:text="#string/_BIWC_your_agent"/>
<ImageView
android:id="#+id/broker_image"
android:layout_width="#dimen/broker_image_size"
android:layout_height="#dimen/broker_image_size"
android:layout_gravity="center"
android:layout_marginTop="#dimen/text_margin_sides"
android:src="#drawable/img_broker_without_image"
tools:ignore="ContentDescription"/>
<TextView
android:id="#+id/broker_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="#dimen/form_margins_mini"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_marginTop="#dimen/form_margins_mini"
android:orientation="horizontal">
<ImageView
android:id="#+id/broker_icon_phone"
android:layout_width="#dimen/icons_size_broker"
android:layout_height="#dimen/icons_size_broker"
android:layout_marginTop="#dimen/form_margins_small"
android:layout_marginBottom="#dimen/text_margin_sides"
android:visibility="gone"
android:src="#drawable/icon_action_phone"
tools:ignore="ContentDescription"/>
<ImageView
android:id="#+id/broker_icon_email"
android:layout_width="#dimen/icons_size_broker"
android:layout_height="#dimen/icons_size_broker"
android:layout_marginTop="#dimen/form_margins_small"
android:layout_marginStart="#dimen/icons_margin_broker"
android:layout_marginBottom="#dimen/text_margin_sides"
android:src="#drawable/ic_email"
tools:ignore="ContentDescription"/>
<ImageView
android:id="#+id/broker_icon_location"
android:layout_width="#dimen/icons_size_broker"
android:layout_height="#dimen/icons_size_broker"
android:layout_marginTop="#dimen/form_margins_small"
android:layout_marginStart="#dimen/icons_margin_broker"
android:layout_marginBottom="#dimen/text_margin_sides"
android:visibility="gone"
android:src="#drawable/ic_location"
tools:ignore="ContentDescription"/>
</LinearLayout>
</LinearLayout>
<TextView
android:id="#+id/broker_introduction_title"
style="#style/wf_text_copy"
android:layout_width="match_parent"
android:gravity="start"
android:layout_marginBottom="20dp"
android:layout_marginLeft="20dp"
android:layout_marginTop="20dp"
android:layout_marginRight="20dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="#id/ly_container"
android:text="#string/_SR_head"/>
<TextView
android:id="#+id/access_code_description"
style="#style/wf_text_hero_copy"
android:layout_width="match_parent"
android:layout_below="#+id/broker_introduction_title"
android:layout_marginLeft=“20dp”
android:layout_marginRight="20dp"
android:layout_marginTop="20dp"
android:layout_marginBottom="20dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="#id/broker_introduction_title"
android:gravity="start"
android:text="#string/_BIWC_welcome_message"/>
<Button
android:id="#+id/btn_go_to_register"
style="#style/wf_button_primary"
android:layout_width="match_parent"
android:layout_alignParentBottom="true"
android:layout_marginBottom="20dp"
android:descendantFocusability="beforeDescendants"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:text="#string/_BIWC_create_account"/>
</android.support.constraint.ConstraintLayout>
And also i attach a photo of the problem. Where you can see how the button is over the text, and the user can't read the text.
You should add layout_constraintBottom_toTopOf & layout_constraintTop_toBottomOf.
layout_constraintBottom_toTopOf —> Align the bottom of the desired view
to the top of another.
layout_constraintTop_toBottomOf —> Align the top of the desired view to
the bottom of another.
<TextView
android:id="#+id/access_code_description"
app:layout_constraintBottom_toTopOf"#+id/btn_go_to_register"
android:layout_marginBottom="20dp" //Remove this line
And
<Button
android:id="#+id/btn_go_to_register"
app:layout_constraintTop_toBottomOf="#+id/access_code_description"
FYI
It will be good approach if you use ScrollView ( Where child is TextView).
Set ScrollView as parent layout and ConstraintLayout in it.
ScrollView documentation
I have a problem with correct display of ImageView. I want to display ImageView inside ConstraintLayout. On preview it looks exactly as i need, but when i'm starting it on device it looks completly dirrerent. This layout is places inside recycle view. What is wrong with this code?
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/promotionRow"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_marginTop="10dp"
android:background="#fff"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp">
<android.support.constraint.ConstraintLayout
android:id="#+id/promotionImageLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintHeight_default="spread"
android:background="#color/colorPrimary">
<ImageView
android:id="#+id/promotionImageView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:scaleType="fitXY"
android:src="#mipmap/ic_start_promotion"
android:background="#mipmap/ic_start_promotion"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintHeight_min="150dp" />
<ImageView
android:id="#+id/fadeGradientImageView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:adjustViewBounds="true"
android:scaleType="fitCenter"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
android:background="#drawable/fade_image_background" />
<TextView
android:text="Sample title"
android:textSize="16sp"
android:textStyle="bold"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="6dp"
android:textColor="#ffffff"
android:id="#+id/promotionNameTextView"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:paddingBottom="8dp"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</android.support.constraint.ConstraintLayout>
<TextView
android:id="#+id/promotionDescriptionTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="13sp"
android:layout_marginTop="12dp"
android:layout_marginStart="12dp"
android:layout_marginLeft="12dp"
android:layout_marginRight="12dp"
android:layout_marginEnd="12dp"
android:layout_marginBottom="12dp"
android:text="Sampe description" />
</LinearLayout>
EDIT: Deep explanation:
I want to create row for RecycleView. Each row have to contains image, title and description. Title have to be in the left bottom corner of the image. Description have to be below the image. After that i have to put gradient (black in the bottom) into the image. Screen with "Preview" is exactly what i need.
EDIT2: Everything with this layout is ok. It is working as expected, i forget that i made some changes in kotlin code... Sory for problem.
First things first, every view should apply the attribute rules of its parent ViewGroup. ConstraintLayout doesn't support match_parent. It supports the 0dp value which means "match constraint". This way the view will expand to fill the constraint bounded space.
Next, ConstraintLayout was created to achieve a flat view hierarchy for better layout performance. So, never nest it inside a LinearLayout as it has the chains feature to get the same behavior in a more flexible way. Plus, you can achieve the structure with a ConstraintLayout at the top level .
Another thing, If you are going to define the same margin in all directions, you can just use layout_margin.
Finally, you have overdraw problems. ConstraintLayout is flexible enough to allow us to position views as backgrounds and help us avoid overlapped backgrounds.
Here's a solution:
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/promotionRow"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp">
<View
android:layout_width="0dp"
android:layout_height="0dp"
android:background="#color/colorPrimary"
app:layout_constraintBottom_toBottomOf="#+id/promotion_image"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageView
android:id="#+id/promotion_image"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:scaleType="fitXY"
android:src="#mipmap/ic_start_promotion"
app:layout_constraintHeight_min="150dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageView
android:id="#+id/shadow"
android:layout_width="0dp"
android:layout_height="80dp"
android:adjustViewBounds="true"
android:background="#drawable/fade_image_background"
app:layout_constraintBottom_toBottomOf="#+id/promotion_image"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent" />
<TextView
android:id="#+id/promotion_name"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:padding="8dp"
android:text="Sample title"
android:textColor="#android:color/white"
android:textSize="16sp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="#+id/promotion_image"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent" />
<TextView
android:id="#+id/description"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="#android:color/white"
android:padding="12dp"
android:text="Sampe description"
android:textSize="13sp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="#+id/promotion_image" />
</android.support.constraint.ConstraintLayout>
Try it. Hope this helps!
First of all, trying to write more presicely what do you want? Display image view inside layout it's somthing common words. As for your code, beside you don't have any constraints. You have strange view height, for second ImageView:
android:layout_height="match_parent"
It may overlay all other children view, it's very strange parameter.
How can I align vertical center of two views align in LinearLayout or RelativeLayout (iOS equivallent of view1.centerY = view2.centerY)?
I am trying to achieve below layout. How can I make the all the three views in first line aligned vertically in xml? The middle view in first line is fixed. I want the left and right view's vertical center line equal to middle views vertical center line.
Constraint layout:
<?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:id="#+id/view"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ConstraintLayout">
<View
android:id="#+id/left"
android:layout_width="70dp"
android:layout_height="30dp"
android:layout_marginBottom="8dp"
android:layout_marginStart="8dp"
android:background="#FF2600"
app:layout_constraintBottom_toBottomOf="#+id/center"
app:layout_constraintEnd_toStartOf="#+id/center"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="#+id/center" />
<View
android:id="#+id/center"
android:layout_width="100dp"
android:layout_height="60dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:background="#0633FF"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<View
android:id="#+id/right"
android:layout_width="70dp"
android:layout_height="30dp"
android:layout_marginEnd="8dp"
android:background="#FF40FF"
app:layout_constraintBottom_toBottomOf="#+id/center"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/center"
app:layout_constraintTop_toTopOf="#+id/center" />
</android.support.constraint.ConstraintLayout>
Using Android's relatively new ConstraintLayout you should be able to treat the top and bottom edges of the blue layout as top and bottom constraints respectively for the red and violet ones. Aligning both of them to both of these constraints at once, while defining their heights in absolute, should render the layout you are looking for. You can refer to the official examples repository to check use cases for this layout type.
Edit: Took a moment to provide you with a simplified example. Only including tags/parameters which are relevant to the case.
<android.support.constraint.ConstraintLayout
...
>
<Layout
android:id="#+id/blue"
...
/>
<Layout
android:id="#+id/red"
android:layout_height="20dp"
app:layout_constraintTop_toTopOf="#+id/blue"
app:layout_constraintBottom_toBottomOf="#+id/blue"
...
/>
<Layout
android:id="#+id/violet"
android:layout_height="20dp"
app:layout_constraintTop_toTopOf="#+id/blue"
app:layout_constraintBottom_toBottomOf="#+id/blue"
...
/>
</android.support.constraint.ConstraintLayout>
Another option is use Frame Layout to vertical Align Views in RelativeLayout
<TextView
android:id="#+id/labelBrightnessSetting"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Display Brightness"
/>
<ImageView
android:id="#+id/btnReduceBrightness"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_below="#+id/labelBrightnessSetting"
android:layout_marginTop="25dp"
android:src="#drawable/vector_minus" />
<!-- This will center align all contents-->
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="150dp"
android:layout_below="#+id/labelBrightnessSetting"
android:layout_marginTop="25dp"
android:layout_toLeftOf="#+id/btnIncreaseBrightness"
android:layout_toRightOf="#+id/btnReduceBrightness">
<SeekBar
android:id="#+id/brightnessSeekbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginLeft="#dimen/margin_5px"
android:layout_marginRight="#dimen/margin_5px" />
</FrameLayout>
<ImageView
android:id="#+id/btnIncreaseBrightness"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_below="#+id/labelBrightnessSetting"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_marginTop="25dp"
android:src="#drawable/vector_plus" />
</RelativeLayout>
I have a RecyclerView with CardView as its items.
Below is the layout for my main activity.
<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"
tools:context="com.example.personal.newz.ui.MainActivity">
<android.support.v7.widget.RecyclerView
android:id="#+id/rv"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintLeft_toLeftOf="parent"></android.support.v7.widget.RecyclerView>
</android.support.constraint.ConstraintLayout>
And below is the layout for my recycler view items
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="200dp"
android:layout_margin="16dp"
card_view:cardCornerRadius="4dp"
>
<android.support.constraint.ConstraintLayout xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.constraint.Guideline
android:id="#+id/vertical_guideline"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.6" />
<TextView
android:id="#+id/date_tv"
android:layout_width="wrap_content"
android:layout_height="16dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="16dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:text="2 hours ago" />
<TextView
android:id="#+id/source_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
android:textStyle="bold"
app:layout_constraintLeft_toRightOf="#id/date_tv"
app:layout_constraintTop_toTopOf="#id/date_tv"
tools:text="BBC News" />
<TextView
android:id="#+id/headline_tv"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
android:layout_marginTop="32dp"
android:maxLines="2"
android:textStyle="bold"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toLeftOf="#id/vertical_guideline"
app:layout_constraintTop_toBottomOf="#id/date_tv"
tools:text="Apple admits slowing down older iphones" />
<TextView
android:id="#+id/description_tv"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:maxLines="4"
app:layout_constraintLeft_toLeftOf="#id/date_tv"
app:layout_constraintRight_toLeftOf="#id/vertical_guideline"
app:layout_constraintTop_toBottomOf="#id/headline_tv"
tools:text="Customers have long suspected iPhones slow down over time. Now, Apple has confirmed some models do." />
<ImageView
android:id="#+id/article_image"
android:layout_width="100dp"
android:layout_height="100dp"
android:scaleType="fitXY"
app:layout_constraintHorizontal_bias=".7"
app:layout_constraintLeft_toRightOf="#id/vertical_guideline"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="#id/source_tv"
tools:src="#drawable/placeholder" />
<ImageView
android:id="#+id/bookmark_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:src="#drawable/bookmark"
app:layout_constraintEnd_toStartOf="#+id/share_image"
app:layout_constraintStart_toEndOf="#+id/vertical_guideline"
app:layout_constraintTop_toBottomOf="#id/article_image"
app:layout_constraintHorizontal_chainStyle="packed"/>
<ImageView
android:id="#+id/share_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/share_icon"
android:layout_marginTop="8dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/bookmark_image"
app:layout_constraintTop_toBottomOf="#id/article_image" />
</android.support.constraint.ConstraintLayout>
</android.support.v7.widget.CardView>
Now when I first start my app the individual cardview's width don't match to the parent and kind of behave like their width is wrap content. After a few seconds the width of all the cardviews adjusts itself to match the parent.
ConstraintLayout does not actually support match_parent for its children. If you try to use match_parent, sometimes it will work, and sometimes it will not. Android Studio is also sort of weird about match_parent, and sometimes will allow it and sometimes will automatically replace it with a hardcoded value that matches the last emulator you ran. Regardless, do not use match_parent for children of a ConstraintLayout.
Instead of android:layout_width="match_parent", use this:
android:layout_width="0dp"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
Instead of android:layout_height="match_parent", use this:
android:layout_height="0dp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
When I make these changes to your RecyclerView tag, the problem goes away.