Develop Reference

LinearLayout how to make TextView wrap content with limit?

I want to show 2 TextView in one horizontal LinearLayout, the first TextView is variable and its length may change. The second is always (B). So I want something like this:
|AAA(B)--------|
When A is very long, it should show ellipse in middle:
|AAAA...AAAA(B)|
To solve the problem, I tried wrap content for A:
<LinearLayout orientation="Horizontal" width="match_parent">
<TextView id="#+id/A" width="wrap_content" />
<TextView id="#+id/B" width="wrap_content" />
</LinearLayout>
But there is problem when A is very long, B disappears. It becomes
|AAAAAAAAAAA|
I also tried to add layout_weight:
<LinearLayout orientation="Horizontal" width="match_parent">
<TextView id="#+id/A" width="wrap_content" layout_weight="1" />
<TextView id="#+id/B" width="wrap_content" />
</LinearLayout>
But there is problem when A is very short, there are unwanted space between A and B, It becomes
|AAA-----(B)| ("-" for space)
I don't want space here.
Is there any way to make wrap_content with a max limit?

With a Horizontal LinearLayout you can achieve this using android:layout_weight="1" to the variable TextView A and android:layout_weight="0" to the fixed TextView B. Also the LinearLayout must have android:layout_width="wrap_content".
Xml structure is like below:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:id="#+id/A"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:ellipsize="middle"
android:text="AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
android:background="#android:color/holo_blue_light"
android:layout_weight="1"
android:singleLine="true" />
<TextView
android:id="#+id/B"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ellipsize="middle"
android:text="B"
android:background="#android:color/holo_red_light"
android:layout_weight="0"
android:singleLine="true"/>
</LinearLayout>
Result when A is Short:
Result when A is Long:

You could use a constraint layout to achieve this.
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
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=".presentation.list.CampaignListActivity">
<TextView
android:id="#+id/A"
android:layout_width="0dp"
android:maxLines="1"
android:ellipsize="middle"
android:text="AAAAAAAAAAAAAAAAAAAAAAAA"
android:layout_height="wrap_content"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintEnd_toStartOf="#id/B"
app:layout_constraintStart_toStartOf="parent"/>
<TextView
android:id="#+id/B"
android:layout_width="0dp"
android:maxLines="1"
android:ellipsize="middle"
android:text="BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB"
android:layout_height="wrap_content"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toEndOf="#id/A"
app:layout_constraintEnd_toEndOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>

Here You Go !
<androidx.cardview.widget.CardView
android:id="#+id/cardView7"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/tv_A"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="this is a long text field kdsalfj lksadjlfja sdljfljas dlfjlas djflk js dalk and this text is more than 20fj"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="#+id/tv_B"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/tv_B"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Less Text"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="#+id/tv_A"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.cardview.widget.CardView>
And then add below code in your OnCreate method:
if (tvA.text.length > 50) {
tvA.text = "${tvA.text.take(20)}...${tvA.text.takeLast(20)}"
}
You have to add the above code lines somewhere so they get executed as the Activity is lauched (e.g. in OnCreate() Function of the Activity)

TextView does not stick to the right

I want to set the TextView stick to right top.
My code is:
<?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="Test.test.MainActivity">
<FrameLayout
android:id="#+id/fragmentContainer"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="42dp"/>
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="42dp"
android:layout_marginRight="0dp"
android:text="#string/Title1"
android:textSize="30dp" />
</android.support.constraint.ConstraintLayout>
I try to set the TextView:
android:layout_alignParentRight="true"
android:layout_marginRight="0dp"
android:layout_marginTop="0dp"
But nothing work, the TextView stay in the left top.
Someone have idea for solution?
UPDATE:
How to stick left TextViewto another TextView that stick to the right parent?
I try set the wight and nothing..
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_weight="0"
android:layout_height="42dp"
app:layout_constraintRight_toRightOf="parent"
android:text="#string/Title1"
android:textSize="30dp" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_weight="1"
android:layout_height="42dp"
app:layout_constraintRight_toRightOf="parent"
android:text="#string/Title2"
android:textSize="30dp" />
I want textView2 will be stick to left textView1.
Find solution to update
I just set in textview2
app:layout_constraintBaseline_toBaselineOf="#+id/textView1"
app:layout_constraintEnd_toStartOf="#+id/textView1"
Thanks,
Tal

In Constraint Layout, set the right constraint of the TextView to right of the parent layout to align it to right
Add following constraint to your TextView
app:layout_constraintRight_toRightOf="parent"
like this
<TextView
android:id="#+id/textViewHowMuchSigned"
android:layout_width="wrap_content"
android:layout_height="42dp"
app:layout_constraintRight_toRightOf="parent"
android:text="#string/Title"
android:textSize="30dp" />

Align ListView with other View

I have an EditText, which gets aligned with other TextView below it.
But as soon as I add ListView, and try to Left align with plain text at the top the width and location of the EditText and TextView fields below it changes.
Also, if I try to use another Linear Layout instead of a ListView I face the same issue. What wrong could I be doing here?
I have tried setting width and height of listView, to match_contraint, but that did not work too.
Below is the xml for it,
<?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="com.example.testapp.app">
<EditText
android:id="#+id/editText6"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="32dp"
android:layout_marginTop="16dp"
android:ems="10"
android:inputType="textPersonName"
android:text="Name"
app:layout_constraintHorizontal_weight="1"
app:layout_constraintStart_toStartOf="#+id/listView4"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/textView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:text="TextView"
app:layout_constraintEnd_toEndOf="#+id/editText6"
app:layout_constraintStart_toStartOf="#+id/editText6"
app:layout_constraintTop_toBottomOf="#+id/editText6" />
<TextView
android:id="#+id/textView3"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:text="TextView"
app:layout_constraintEnd_toEndOf="#+id/textView"
app:layout_constraintStart_toStartOf="#+id/editText6"
app:layout_constraintTop_toBottomOf="#+id/textView" />
<ListView
android:id="#+id/listView4"
android:layout_width="395dp"
android:layout_height="472dp"
app:layout_constraintHorizontal_weight="0"
tools:layout_editor_absoluteX="8dp"
tools:layout_editor_absoluteY="123dp" />
</android.support.constraint.ConstraintLayout>

I think you put constraints in the wrong direction. So you aligned all TextViews to the start of the EditText. But EditText in its turn is aligned to the start of the ListView.
app:layout_constraintStart_toStartOf="#+id/listView4"
And as ListView doesn't have aligning, it is positioned at (0, 0), I guess.

app:layout_marginBottom is not working well with android constraint layout

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>

Put a button over an ImageView

I'm newbie in Android.
I would like to know if it's possible to put a button or another component over an ImageView. I've tried setting the image as a background image of a LinearLayout, but when I change between landscape and portrait mode, the image porportions are changed.
Thanks a lot.

Don't put the image as a background, you don't have any control on how the image is scaled. Instead, create a RelativeLayout, and put an ImageView as one of the child, and you can place anything (buttons etc) as other RelativeLayout children.
<RelativeLayout ...>
<ImageView (your image) ...>
<Button (the button you want) ... />
</RelativeLayout>

Try this code... it's Help you....
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/imageviewMain"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="Path "
/>
<Button android:id="#+id/but2"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
Try this Code .....
In that give paramater in button to set your Button Position....
android:layout_margin or android:layout_alignParent
And also give Path of Image....

There is another way to do it,http://www.curious-creature.org/2009/03/01/android-layout-tricks-3-optimize-part-1/
Thank you.

The simpliest way to do it is to use a FrameLayout.

This is easy using the ConstraintLayout.
Set the constraints of the Button to the ImageView.
Drag the Button anywhere you want over the ImageView to position it.
XML code will be autogenerated.

For those using Constraint Layout: Just use an ImageView and add its constraints from all the four side to Parent and than add the other views as well.
<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
app:cardCornerRadius="10dp"
app:cardElevation="10dp"
app:cardPreventCornerOverlap="true"
app:contentPadding="5dp"
xmlns:app="http://schemas.android.com/apk/res-auto">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="5dp">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="#drawable/food"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageButton
android:id="#+id/imagebtn_share"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_share_24"
app:layout_constraintTop_toTopOf="parent"
android:padding="15dp"
app:layout_constraintStart_toStartOf="parent" />
<ImageButton
android:id="#+id/imagebtn_call"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_call_24"
android:padding="15dp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintEnd_toEndOf="parent" />
<TextView
android:id="#+id/expdate_textview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/test_date"
android:background="#E2E3E4"
android:layout_marginBottom="10dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintBottom_toTopOf="#+id/imagebtn_address"
android:layout_marginEnd="30dp"
android:padding="5dp"/>
<TextView
android:id="#+id/title_textview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="5dp"
android:layout_marginBottom="5dp"
android:background="#E2E3E4"
android:padding="5dp"
android:textSize="18sp"
android:text="#string/test_foodname"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="#+id/imagebtn_address"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent" />
<ImageButton
android:id="#+id/imagebtn_address"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_location_on_24"
android:padding="15dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.cardview.widget.CardView>
Note: Replace the drawables added with your own.