I would like to know if there is any way to, in Android, using ConstraintLayout, to set a max spacing between two views when using Chains. I know that using the margin attributes works like a minimum spacing between two views, but I could not figure out how to set a max spacing.
For example, how could I achieve that through the following layout xml (max spacing = 20dp)?
<?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">
<View
android:id="#+id/left_view"
android:layout_width="50dp"
android:layout_height="50dp"
android:background="#FF0000"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toLeftOf="#+id/right_view"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintHorizontal_chainStyle="spread" />
<View
android:id="#+id/right_view"
android:layout_width="50dp"
android:layout_height="50dp"
android:background="#00FF00"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toRightOf="#+id/left_view"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
Set vertical or horizontal spacing with <Space>. The key is to set width or height to 0dp to max space between elements, or any value for fixed spacing (20dp):
<Space
android:layout_width="0dp"
android:layout_height="1dp"/>
If you want to set custom spacing (max 20dp) then you should use this:
app:layout_constraintHorizontal_chainStyle="packed"
Then you can add spacing between the views using margin so that it will be the max spacing between them.
<?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"
android:layout_width="match_parent"
android:layout_height="match_parent">
<View
android:id="#+id/left_view"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_marginEnd="10dp"
android:background="#FF0000"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_chainStyle="packed"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toLeftOf="#+id/right_view"
app:layout_constraintTop_toTopOf="parent" />
<View
android:id="#+id/right_view"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_marginStart="10dp"
android:background="#00FF00"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toRightOf="#+id/left_view"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
Related
Hello guys, I need to add 2 fixed width and height imageview in to center of screen using constraint layout how we can achieve something like this.
xml 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"
tools:context=".ui.activity.profile.view.UserDetailsActivity">
<TextView
android:id="#+id/tv_label"
android:layout_width="0dp"
android:layout_height="0dp"
android:gravity="center"
android:text="#string/you_are"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHeight_percent=".1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintWidth_percent=".25" />
<CircularImageView
android:id="#+id/iv_farmer"
android:layout_width="#dimen/_100dp"
android:layout_height="#dimen/_100dp"
android:src="#drawable/ic_profilewithimage"
app:civ_border="true"
app:civ_border_color="#e4e4e4"
app:civ_border_width="#dimen/_1dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="#+id/iv_prof"
app:layout_constraintTop_toBottomOf="#+id/tv_label" />
<CircularImageView
android:id="#+id/iv_prof"
android:layout_width="#dimen/_100dp"
android:layout_height="#dimen/_100dp"
android:src="#drawable/ic_profilewithimage"
app:civ_border="true"
app:civ_border_color="#e4e4e4"
app:civ_border_width="#dimen/_1dp"
app:layout_constraintLeft_toRightOf="#+id/iv_farmer"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="#+id/tv_label" />
</android.support.constraint.ConstraintLayout>
i am trying this but views are not centerd.
I have updated your xml code. Please try with 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"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/tv_label"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:gravity="center"
android:text="You are"
app:layout_constraintBottom_toTopOf="#+id/iv_farmer"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHeight_percent=".1"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintWidth_percent=".25" />
<CircularImageView
android:id="#+id/iv_farmer"
android:layout_width="#dimen/_100dp"
android:layout_height="#dimen/_100dp"
android:src="#drawable/ic_profilewithimage"
app:civ_border="true"
app:civ_border_color="#e4e4e4"
app:civ_border_width="#dimen/_1dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="#+id/iv_prof"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<CircularImageView
android:id="#+id/iv_prof"
android:layout_width="#dimen/_100dp"
android:layout_height="#dimen/_100dp"
android:src="#drawable/ic_profilewithimage"
app:civ_border="true"
app:civ_border_color="#e4e4e4"
app:civ_border_width="#dimen/_1dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/iv_farmer"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
Hope it helps :)
In your first CircularImageView there's a problem with your right constraint:
app:layout_constraintRight_toRightOf="#+id/iv_prof"
This should be constrained to the left of iv_prof:
app:layout_constraintRight_toLeftOf="#id/iv_prof"
If you want the to be closer together in the center then change the style of the chain to packed by adding this attribute to the first CircularImageView:
app:layout_constraintHorizontal_chainStyle="packed"
To center the Views vertically in the parent you need to constraint the top and bottom of each View to the top and bottom of the parent respectively.
Also you're using left/right constraints for some Views and start/end for others. Try using just one set of them across the whole layout.
It worked for me using bias:
<androidx.constraintlayout.widget.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:layout_gravity="center">
<ImageView
android:id="#+id/img_splash_logo"
android:layout_width="200dp"
android:layout_height="200dp"
android:src="#drawable/weather_logo"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
This layout will display a View with a color and another with another color.
When layout_constraintWidth_percent = 1 the views are the same width. When I set it between 0.92 <> 1 the foreground view becomes bigger then the background.
Can anyone solve this? I need the foreground to be x percentage of the background
<?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"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="15dp"
android:paddingBottom="15dp"
>
<View
android:id="#+id/background"
android:layout_width="match_parent"
android:layout_height="100dp"
android:layout_marginEnd="16dp"
android:layout_marginStart="16dp"
android:background="#color/colorPrimary"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
/>
<View
android:id="#+id/foreground"
android:layout_width="0dp"
android:layout_height="80dp"
android:background="#color/colorAccent"
app:layout_constraintWidth_percent="0.94"
app:layout_constraintHorizontal_bias="0"
app:layout_constraintBottom_toBottomOf="#id/background"
app:layout_constraintLeft_toLeftOf="#id/background"
app:layout_constraintRight_toRightOf="#id/background"
app:layout_constraintTop_toTopOf="#id/background"
/>
</android.support.constraint.ConstraintLayout>
Remove the start and end margins of the background. If you want left and right margins, put them on the parent ConstraintLayout instead. As it is now you have margins on background but not on foreground.
Also set the background width to 0dp (the same as foreground). This way the background will be the full width of the parent ConstraintLayout (which can itself apply the margins you want) and the foreground will be the specified percentage of the background. Also set the horizontal bias of the foreground to 0.5 if you want it to be centered.
Like 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"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="15dp"
android:paddingBottom="15dp"
android:layout_marginEnd="16dp"
android:layout_marginStart="16dp"
>
<View
android:id="#+id/background"
android:layout_width="0dp"
android:layout_height="100dp"
android:background="#color/colorPrimary"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
/>
<View
android:id="#+id/foreground"
android:layout_width="0dp"
android:layout_height="80dp"
android:background="#color/colorAccent"
app:layout_constraintWidth_percent="0.94"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintBottom_toBottomOf="#id/background"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="#id/background"
/>
</android.support.constraint.ConstraintLayout>
As stated from the doc, the percentage is relative to the parent:
When a dimension is set to MATCH_CONSTRAINT, the default behavior is
to have the resulting size take all the available space. Several
additional modifiers are available:
layout_constraintWidth_min and layout_constraintHeight_min : will set
the minimum size for this dimension
layout_constraintWidth_max and
layout_constraintHeight_max : will set the maximum size for this
dimension
layout_constraintWidth_percent and
layout_constraintHeight_percent : will set the size of this dimension
as a percentage of the parent
The app:layout_constraintWidth_percent attribute is calculated according to the parent ConstraintLayout's dimension and not the horizontal constraints of the View. So you need to wrap the foreground in another ConstraintLayout like this (which is a bit ugly because of the nested 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"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="15dp"
android:paddingBottom="15dp">
<View
android:id="#+id/background"
android:layout_width="0dp"
android:layout_height="100dp"
android:layout_marginEnd="16dp"
android:layout_marginStart="16dp"
android:background="#color/colorPrimary"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
<android.support.constraint.ConstraintLayout
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="#id/background"
app:layout_constraintLeft_toLeftOf="#id/background"
app:layout_constraintRight_toRightOf="#id/background"
app:layout_constraintTop_toTopOf="#id/background">
<View
android:id="#+id/foreground"
android:layout_width="0dp"
android:layout_height="80dp"
android:background="#color/colorAccent"
app:layout_constraintHorizontal_bias="0"
app:layout_constraintWidth_percent="0.94"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
</android.support.constraint.ConstraintLayout>
</android.support.constraint.ConstraintLayout>
Keep in mind that using app:layout_constraintWidth_percent and margins on a View at the same time can potentially lead to some problems because the margins aren't taken into account for the width percentage.
You can also consider removing the margins from the background and possibly adding them to root ConstraintLayout as padding and I think this would help avoid having a nested 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"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="15dp"
android:paddingBottom="15dp"
android:paddingStart="16dp"
android:paddingEnd="16dp">
<View
android:id="#+id/background"
android:layout_width="0dp"
android:layout_height="100dp"
android:background="#color/colorPrimary"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
<View
android:id="#+id/foreground"
android:layout_width="0dp"
android:layout_height="80dp"
android:background="#color/colorAccent"
app:layout_constraintWidth_percent="0.94"
app:layout_constraintHorizontal_bias="0"
app:layout_constraintBottom_toBottomOf="#id/background"
app:layout_constraintLeft_toLeftOf="#id/background"
app:layout_constraintRight_toRightOf="#id/background"
app:layout_constraintTop_toTopOf="#id/background"/>
</android.support.constraint.ConstraintLayout>
I've been experimenting with ConstraintLayout, is there a way to set the max width of a view to a percentage of the parent (and a height of match constraint and dimension ratio of 1:1)?
Here is the code without using max width:
<?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"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<FrameLayout
android:id="#+id/frameLayout3"
android:layout_width="0dp"
android:layout_height="259dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:background="#android:color/black"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toEndOf="#+id/imageView"
app:layout_constraintTop_toTopOf="parent"/>
<ImageView
android:id="#+id/imageView"
android:layout_width="0dp"
android:layout_height="0dp"
android:src="#android:drawable/ic_menu_add"
app:layout_constraintBottom_toBottomOf="#+id/frameLayout3"
app:layout_constraintDimensionRatio="1:1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintWidth_percent="0.3"/>
</android.support.constraint.ConstraintLayout>
This is the result:
Tablet:
Phone:
I achieved the max width percentage using two attributes:
app:layout_constraintWidth_max="wrap"
app:layout_constraintWidth_percent="0.4"
Example:
<TextView
android:id="#+id/textView2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:text="Helo world"
android:textAlignment="viewStart"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintWidth_max="wrap"
app:layout_constraintWidth_percent="0.4" />
The text width will increase to 40% of parent and then wrap if the content exceeds that.
If I'm understanding your problem right then You're almost there. I think you're giving frameLayout static height that's why it is not giving the appropriate result on tablet.. because you set the height according to phone preview. What you need to do is make the height of frameLayout relative to imageView.. so when imageView grows in size the frameLayout also grows with it.
I think you should do something like 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"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:id="#+id/imageView"
android:layout_width="0dp"
android:layout_height="0dp"
android:src="#android:drawable/ic_menu_add"
app:layout_constraintDimensionRatio="1:1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintWidth_percent="0.3" />
<FrameLayout
android:id="#+id/frameLayoutTwo"
android:layout_width="0dp"
android:layout_height="0dp"
android:background="#android:color/black"
app:layout_constraintBottom_toBottomOf="#+id/imageView"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/imageView"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
I checked and this gives the same result in phone and tablet. Correct me if I misunderstood your problem.
No, there is not. I think we should file a feature request. I am pretty sure that PercentRelativeLayout also does not have this feature. (This answer is accurate for ConstraintLayout 1.1)
You can set a LinearLayout or other ViewGroup as exact percent width and place your wrap_content view inside this layout.
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="#+id/image_place_holder"
android:layout_width="0dp"
android:layout_height="0dp"
android:scaleType="centerCrop"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<!-- This LinearLayout will have exact 80% of parent width-->
<LinearLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintWidth_percent="0.8">
<!-- This MaterialCardView will get a wrap_content width,
with a max width of his parent LinearLayout, which is 80% -->
<com.google.android.material.card.MaterialCardView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="#dimen/half_activity_horizontal_margin"
android:layout_marginTop="#dimen/half_activity_vertical_margin"
android:layout_marginEnd="#dimen/half_activity_horizontal_margin"
android:layout_marginBottom="#dimen/half_activity_vertical_margin"
android:backgroundTint="?attr/colorPrimary">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:maxLines="1"
android:paddingStart="#dimen/half_activity_horizontal_margin"
android:paddingEnd="#dimen/half_activity_horizontal_margin"
android:text="Lorem ipsum"
android:textAppearance="?attr/textAppearanceCaption" />
</com.google.android.material.card.MaterialCardView>
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
I need to build a square that always spreads over the entire width of the screen (portrait orientation), whatever the size of the screen. Below this square and some fixed height widgets, I want to allocate the remaining available space to a text field.
The simplified code below shows what I have tried so far:
<?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"
tools:context=".ScMainFull"
>
<android.support.constraint.ConstraintLayout
android:id="#+id/Grid"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintDimensionRatio="1:1"
android:layout_margin="16dp"
app:layout_constraintVertical_chainStyle="spread_inside"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintBottom_toTopOf="#+id/button1"
/>
<Button
android:id="#+id/button1"
android:layout_width="0dp"
android:layout_height="48dp"
android:text="1"
android:layout_margin="16dp"
app:layout_constraintTop_toBottomOf="#+id/Grid"
app:layout_constraintBottom_toTopOf="#+id/Report"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
/>
<TextView
android:id="#+id/Report"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_margin="16dp"
app:layout_constraintTop_toBottomOf="#+id/button1"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
/>
</android.support.constraint.ConstraintLayout>
On the vertical axis, the available space (total height less vertical margins and fixed height button) is evenly distributed between the two widgets that have layout_height="0dp" ignoring the horizontal constraints in the first widget.
What should I change in this code to have the space allocated to the textview calculated after the square has been built to occupy the full width of the screen? Another way to ask the same question would be: how can I force the horizontal constraints on the square to get priority over its vertical constraints?
Just remove the squared top ConstraintLayout from the chain.
<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.support.constraint.ConstraintLayout
android:id="#+id/Grid"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintDimensionRatio="1"
android:layout_margin="16dp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
/>
<Button
android:id="#+id/button1"
android:layout_width="0dp"
android:layout_height="48dp"
android:text="1"
android:layout_margin="16dp"
app:layout_constraintVertical_chainStyle="spread_inside"
app:layout_constraintTop_toBottomOf="#+id/Grid"
app:layout_constraintBottom_toTopOf="#+id/Report"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
/>
<TextView
android:id="#+id/Report"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_margin="16dp"
app:layout_constraintTop_toBottomOf="#+id/button1"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
/>
</android.support.constraint.ConstraintLayout>
You are doing it wrong if you are thinking about nesting another ViewGroup.
I used constraintLayout and layout_constraintDimensionRatio="1:1"
(width is wrap_content, height is 0dp (match_constraint))
As a result, I expected width and height to be 1:1, but it's not working.
What is wrong?
I attached code and screenshot.
<?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/t1"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:background="#android:color/holo_blue_bright"
android:gravity="center"
android:text="Hello World!11"
app:layout_constraintDimensionRatio="1:1" />
</android.support.constraint.ConstraintLayout>
screenshot
I quote android developer site about Constraintlayout.
https://developer.android.com/reference/android/support/constraint/ConstraintLayout.html#DimensionConstraints
Ratio :: You can also define one dimension of a widget as a ratio of
the other one. In order to do that, you need to have at least one
constrained dimension be set to 0dp (i.e., MATCH_CONSTRAINT), and set
the attribute layout_constraintDimentionRatio to a given ratio. For
example:
<Button android:layout_width="wrap_content"
android:layout_height="0dp"
app:layout_constraintDimensionRatio="1:1" />
will set the height of the button to be the same as its width.
but it was not working.
You forget to add your constraints
<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/t1"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:background="#android:color/holo_blue_bright"
android:gravity="center"
android:text="Hello World!11"
app:layout_constraintDimensionRatio="1" />
</android.support.constraint.ConstraintLayout>
0dp is only applied to the child views of ConstraintLayout.
Any view should apply the attribute rules of its parent.
As off version 1.1.0 this has changed.
You can now define:
app:layout_constraintDimensionRatio="1:1"
app:layout_constraintDimensionRatio="W,1:1"
app:layout_constraintDimensionRatio="H,1:1"
Check the link below to find all the documentation regarding DimensionConstraints:
Link to the docs
In my case I have a problem like i have to fill my layout inside container with A4 size paper ratio.
Problem
I am getting A4 size resume pages as images from backend so i have to append those images in Viewpager in which i am using ImageView to display those images.
Solution
I went through Constraint layout document in which Ratio section is there. So i can use layout_constraintDimensionRatio for solving my problem.
So my xml that is used to Display the whole Layout is following, in my case i have used app:layout_constraintDimensionRatio="1:1.27" as with:height ratio but the actual ratio is app:layout_constraintDimensionRatio="1:1.41"
<?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"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/orange">
<!-- divider line which i used as restricting my A4 size container height-->
<View
android:id="#+id/divider"
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="#color/headline_title_color"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias=".85"/>
<!-- A4 size Image View-->
<ImageView
android:id="#+id/resumeContainer"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginLeft="12dp"
android:layout_marginTop="16dp"
android:layout_marginRight="12dp"
android:layout_marginBottom="16dp"
android:background="#color/green"
android:text="#string/change"
android:src="#drawable/banner"
app:layout_constraintBottom_toTopOf="#id/divider"
app:layout_constraintDimensionRatio="1:1.27"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
/>
<!-- for Bottom two buttons -->
<com.bold.job.utils.CustomButton
android:id="#+id/preview"
style="#style/tertiaryButtonStyle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:onClick="preview"
android:text="#string/preview_resume"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toLeftOf="#id/guideline"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toBottomOf="#id/divider"
/>
<android.support.constraint.Guideline
android:id="#+id/guideline"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.5" />
<com.bold.job.utils.CustomButton
android:id="#+id/preview2"
style="#style/tertiaryButtonStyle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:onClick="preview"
app:layout_constraintLeft_toRightOf="#id/guideline"
app:layout_constraintRight_toRightOf="parent"
android:text="#string/preview_resume"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toBottomOf="#id/divider"
/>
</android.support.constraint.ConstraintLayout>
Please notice the last line, adding constraints around the edges makes the constraint work.
You can also use the design view in Studio, and drag and drop the constraints between objects.
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Available chats" />
<ListView
android:id="#+id/listChats"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintTop_toBottomOf="#+id/textView"/>