Develop Reference

How to go beyond the edge parent element

I have a circular image and a button icon
Lets say image is size of 20x
And button is size of 8x
I want to put the button icon in a way that 80% of its portion stays on the image view and 20% goes beyond it.
My xml code-
RelativeLyaout<
andoird.cardview.widget.Cardview<
<ImageView/>
/>
<button_icon>
layout_alignRight:ImageView
</button_icon>
ImageViw and button_icon overlaps but not that way I want.
80% portion of the button stays behind the image view that i cant see and the rest 20% of the button that goes beyond the image view is visible
This is for my Android studio app. I things above code is less time consuming.
If you need full code i can provide that too.

you can't exceed parents bounds. but you can introduce one extra layer which will hold both your Views and second one may cover part of first one. some basic example with FrameLayout
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<View
android:layout_width="100dp"
android:layout_height="100dp"
android:background="#097267">
<View
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_margin="40dp"
android:background="#A9C26A">
</FrameLayout>
also be aware that elevation and translationZ XML attributes may change order of drawing (first View will be drawn on top of second and will cover it). e.g. Button have some elevation set by default, also CardView (setCardElevation(float)) - additionally (mainly?) this makes some small shadow under these Views

Try this code... I have added constraint layout and inside it i have added button overlapping the image.
You can change the size according to your requirements !!
<?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">
<de.hdodenhof.circleimageview.CircleImageView
android:id="#+id/circleImageView4"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_marginTop="60dp"
android:src="#drawable/blue1"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.057"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<androidx.appcompat.widget.AppCompatButton
android:layout_width="60dp"
android:layout_height="40dp"
android:layout_marginTop="50dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.166"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="#+id/circleImageView4" />
</androidx.constraintlayout.widget.ConstraintLayout>

How to position a view in Android constraint layout outside the screen at the beginning

I have a View in a Constraint Layout and I would like that at the very beginning it should be outside of the screen (and then later slowly move into the scree from right to left). Now, I kind of need something like negative bias or margins.
I had a look at this question How to achieve overlap/negative margin on Constraint Layout?. The accepted answer using android:layout_marginTop="-25dp" does not have any effect (altough the top of the view is constrained and I use"androidx.constraintlayout:constraintlayout:2.1.3").
I tried the second most upvoted answer and used the code:
view.setTranslationX(view.getWidth() - 20);
This actually works. However, the problem is that when the Fragment is created you first see that the view is not on the left for a short period of time. This is not what I want. I would like to have the view beyond the right rim of the layout at the very very beginning such that it can later move into the layout.
Do you have any idea how I can do that? Ideally I would like to do this programmatically.
Update: Here is the code of the XML layout where a negative margin does not have any effect:
<?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"
android:background="#drawable/game_test_background"
tools:context=".MainActivity"
android:id="#+id/constraintLayout">
<ImageView
android:id="#+id/imageView_RedRectange_Test"
android:layout_width="0dp"
android:layout_height="30dp"
android:layout_marginTop="-1250dp"
app:layout_constraintWidth_percent="0.25"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.048"
app:srcCompat="#drawable/red_rectangle" />
<Button
android:id="#+id/button"
android:layout_width="0dp"
android:layout_height="0dp"
android:text="Button"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHeight_percent="0.102"
app:layout_constraintHorizontal_bias="0.373"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.745"
app:layout_constraintWidth_percent="0.12" />
</androidx.constraintlayout.widget.ConstraintLayout>

Okay so to have a negative margin you can use translateX, translateY or TranslationZ.
in xml like so:
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Hello World!"
android:translationX="-60dp"
android:translationY="-90dp"
android:translationZ="-420dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
or programmatically like so:
View view = ...;
view.setTranslationX(-60);
view.setTranslationY(-90);
view.setTranslationZ(-420);
Then in order to slowly bring it in from right to left you can use the animate() method like so:
View view = ...;
view.animate().setDuration(1000).translationX(-600).start();

There is a problem with setting the width of the button using app:layout_constraintWidth_percent when the ImageView has a negative margin. The problem should go away if you can set a definite width to the button (instead of 0dp).
The problem should also resolve if you set app:layout_constraintWidth_percent to a value such that the text of the button shows completely on one line.
Here is a simplified layout to demonstrate this issue. The ConstraintLayout has two views that are simply constrained to the parent to appear in vertical center of the layout. These two views have no dependencies on each other. In addition, the ImageView has a top margin of -250dp, so it should appear above the layout's vertical center.
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#android:color/holo_green_light">
<ImageView
android:id="#+id/redRectangle"
android:layout_width="100dp"
android:layout_height="30dp"
android:layout_marginTop="-250dp"
android:layout_marginEnd="16dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="#drawable/red_rectangle" />
<Button
android:id="#+id/button"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="Button"
android:textSize="18sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintWidth_default="percent"
app:layout_constraintWidth_percent="0.12" />
</androidx.constraintlayout.widget.ConstraintLayout>
Here is what happens then the width of the ImageView is changed from 0dp to a non-zero value of 1dp. When the width is set to 0dp, the negative margin seems to be ignored. It is only when the width is set to a non-zero value that the ImageView is correctly placed.
Changing the width of the button should have no effect on the placement of the ImageView; however, the button only appears in the proper position when the button has a non-zero width.
Here is what happens when the app:layout_constraintWidth_percent is increased so that the word "Button" is not cutoff.
Again, the placement of the ImageView should be independent of the width of the button. Instead, the button only appears in the correct position when the app:layout_constraintWidth_percent is set such that the word "Button" is not cutoff.
This is only an issue with negative margins. Positive margins work as expected.
This is a strange problem, so you may want to use one of the other solutions mentioned.
(ConstraintLayout version 2.1.3)

Can't center button in constraint layout

This question may have been asked a million times and seem trivial but i still do not understand the logic behind it after reading about 100 of answers.
I have this ultra simple layout XML
<?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"
tools:context=".MainActivity">
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0" />
</androidx.constraintlayout.widget.ConstraintLayout>
From my understanding if i set opposing constraints the render engine interprets them automatically as percentage... i mean right ?
If no specific margin or anything is set then it evens out the distances. This would clearly mean that the button should tae a centered position inside the view. But it doesnt....
I dont understand it. i want to center with WITHOUT SETTING A MARGIN since a margin, from my understanding, is something independent of the constraint. It works within a constraint. but nevertheless i set a margin of 50 on each side. once a margin is set on opposing sides the engine should automatically render it as percentage.... right ?
So this XML:
<?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"
tools:context=".MainActivity">
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="50dp"
android:layout_marginLeft="50dp"
android:layout_marginTop="50dp"
android:layout_marginEnd="50dp"
android:layout_marginRight="50dp"
android:layout_marginBottom="50dp"
android:text="Button"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0" />
</androidx.constraintlayout.widget.ConstraintLayout>
should say something like "the constraint is 50% to left right top and bottom" which essentially again is exactly the middle. Of course this is again not working. The engine interprets it as absolute value and the button is in another awkward position:
So how to do this ??
What I DON'T WANT TO DO:
Adjust it with some kind of Guideline or Bias.
I want the plain thing.
Just 4 constraints (4 lines inside the xml) and a button that is in the middle of the screen on any device.
Maybe someone can share some insight ?

You should delete these two attributes:
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintVertical_bias="0.0"
As you can see the official reference, default bias is fifty-fifty (50% = 0.5).
For example the following will make the left side with a 30% bias
instead of the default 50%, such that the left side will be shorter,
with the widget leaning more toward the left side (Fig. 5):

Android textview: text flowing over RHS of screen

I have created a text view (mostly auto-created by Android Studio's 'new Tabbed Activity' helper) and populated it with some text stored as raw resources. I have allowed the view to scroll, and it's all working fine except that the last letter or two of many lines disappears off the edge of the screen. It's the same with two devices, with different screen sizes.
here's my resource file:
<?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:id="#+id/constraintLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ui.main.PlaceholderFragment">
<TextView
android:id="#+id/section_label"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="#dimen/activity_horizontal_margin"
android:layout_marginTop="#dimen/activity_vertical_margin"
android:layout_marginEnd="#dimen/activity_horizontal_margin"
android:layout_marginBottom="#dimen/activity_vertical_margin"
android:textSize="20sp"
android:scrollbars = "vertical"
android:justificationMode="inter_word"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="#+id/constraintLayout"
tools:layout_constraintLeft_creator="1"
tools:layout_constraintTop_creator="1" />
</androidx.constraintlayout.widget.ConstraintLayout>
I have tried enlarging the marginEnd (from 20 to 50dp) - no effect, and also tried android:gravity="center", but that made it worse!
[Edit]
As a result of suggested answers, the view has changed a little; a margin has appeared down the RHS so the text no longer disappears 'off the edge' of the screen, but it disappears 'behind' the margin. Does this help? Also , does the fact that this is a tabbed activity (as I mentioned earlier) have any bearing? If I scroll sideways, to see the next tab, the missing parts of the words still don't appear.

This happens because your TextView is not constrained to the right edge of the parents.
You can fix this by adding the following to your TextView
app:layout_constraintRight_toRightOf="parent"
But you should avoid using left and right in your layouts. So the correct way would be to add
app:layout_constraintEnd_toEndOf="parent"
And also change width to 0dp so that the TextView can take up the space defined by the constraints.

Use app:layout_constrainedWidth="true" on your textView with start and end constraint set to parent.

Flat ConstraintLayout with layout_constraintHeight_min for each row doesn't work

I have what I think is a pretty common use case: I have multiple rows of information on the screen. I'm hoping to implement these views without having to use nested ViewGroups. Each row should have a minimum height, but expand if the contents are larger than the minimum height. The contents should be nested vertically.
It seems like this simplified example should work:
<?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/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Row"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="#+id/view"
app:layout_constraintBottom_toBottomOf="#+id/view"/>
<View
android:id="#+id/view"
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="#8800ff00"
app:layout_constraintHeight_min="100dp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="#id/textView"/>
</android.support.constraint.ConstraintLayout>
Instead of creating a ViewGroup for each row, I have a flat layout with constraints. A View for each row sets the row height and can be clickable. The views inside the row are siblings in the layout hierarchy, but center themselves vertically in the middle of the View for that row. Since I've specified app:layout_constraintHeight_min and anchor the bottom of the View to the bottom of the contents, it should grow with the contents.
But there's a problem:
ConstraintLayout adds undesired spacing above the row! Note that the unwanted spacing above the row is equal to the correct spacing between the bottom of the contents and the bottom of the row.
My theory is this: since the View's bottom is anchored to the bottom of the contents (the TextView) it wants to stick tightly to that and be right next to it. If I force it to move further away, it adds something like a bottom margin to accomplish that, it adds a similar top margin to be symmetrical.
How do I make it stop? If it wasn't for that unwanted spacing on the top, I'd have exactly what I need. Perhaps there's some special ConstraintLayout trick, some magical attribute to fix this behavior. Or maybe there's a completely different way to use ConstraintLayout to accomplish the UI I want.
I realize that using fixed-height rows would make this much simpler, but I don't like doing that if the contents can grow.
I could change my UI to have a nested ConstraintLayout for each row, but I'd rather not do that after working so hard to make a complex layout completely flat, without multiple layers of ViewGroups. But that's what I'll do if I can't find a better solution, which I hope to find here.

I think removing the min height and adding some margin in the TextView will do the thing and instead of using match_parent you can use constraints if possible
<?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">
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="50dp"
android:text="Row is not column"
android:textColor="#283858"
app:layout_constraintBottom_toBottomOf="#+id/view"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="#+id/view"/>
<View
android:id="#+id/view"
android:layout_width="0dp"
android:layout_height="0dp"
android:background="#8800ff00"
app:layout_constraintBottom_toBottomOf="#id/textView"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>