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Remove arrow icon from expendable card view android

I am using https://github.com/AleSpero/ExpandableCardView library to make an expendable card view. But i don't need the arrow placed in right side.
I also try to find for the attribute or method that can remove this but don't find any one. Please help me to solve this. I will be very grateful. Thanks in advance for your time.
card.setIcon(null);
but it remove only the left icon not the right icon.

Just add this lineandroid:groupIndicator="#null"
<ExpandableListView
android:id="#+id/ev_menu"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="188dp"
android:background="#android:color/white"
android:dividerHeight="0dp"
android:groupIndicator="#null" />

On your MainActivity please use below code
val card : ImageButton = findViewById(R.id.card_arrow)
card.visibility=View.INVISIBL
or remove icon from this xml file expandable_cardview
<ImageButton
android:id="#+id/card_arrow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="20dp"
android:layout_alignParentEnd="true"
android:background="?selectableItemBackgroundBorderless"
android:contentDescription="#string/expandable_card_view_image_content_description"/>

how to define correctly textview width

Hi everyone i got a little problem about the width of my textview
it looks like this
as you can see, my textview is bigger than my text :/
here is my code :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:weightSum="2">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="destinataire"
android:id="#+id/tv_destinataire"
android:layout_gravity="left|top"
android:layout_weight="1"
android:layout_marginLeft="25dp"
android:layout_marginTop="10dp"
android:padding="10dp"
android:layout_marginBottom="10dp"
android:textColor="#000000" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="envoyeur"
android:id="#+id/tv_envoyeur"
android:layout_gravity="right|top"
android:layout_weight="1"
android:layout_marginRight="25dp"
android:layout_marginTop="10dp"
android:padding="10dp"
android:textColor="#ffffff"
android:layout_marginBottom="10dp" />
</LinearLayout>
i would like something like this, if the message contain some word well "wrap_content" whereas is long long message something like maximum 70% of width :
thank you :)

You can reach what you said adding some logic directly on your activity and not in the XML file. You can set the width by Java code with something like:
TextView t = (TextView)findViewById(R.id.myTextView);
where myTextView is the id that you declared in your XML.
Now go ahead and write some logic...
If is necessary:
t.setWidth(200);
Note that 200 is only an example, you can calculate the width you need before.

If I were you, I might use the relative layout and add maxWidth limit to TextView containing text, and as the dialog going, just place the TextView below the last TextView and use alignStart/alightParentStart and alignEnd/alignParentEnd to indicate who's speaking.
when a new message arrives
prepare your relative layout parameter, add layout rules
set text, maxwidth limit, layout parameter and other style you want for your text
add the view to a scrollable relative layout container
Sorry for my bad English in case of you have any reading problem. :)

Displaying text using textView() Android

Unsure of how to display text in the xml file, i have code written to output text in the java file but nothing happens when the application is run
TextView tv = (TextView) findViewById(R.id.my_text_view);
tv.setText("Welcome to the Dungeon");
*
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/my_text_view"
android:text="#string/my_text_view"/>

Use this:
<TextView android:id="#+id/my_text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Example"
android:layout_gravity="center"
android:textColor="#656565"
android:textSize="20dp" />
And then setText

why are you setting text twice in xml and java, just add once as:
but whatever try to provide : fontsize, and gravity(center) of layout, either programmatically or in xml

Custom button programmatically android

I'm creating a list of buttons in Android with the same icon for each of them and then set the text programmatically. So my list has:
ImageView (always the same) + Text (label for the icon which I set programmatically).
How can I create a something like the icon below but where I can change text dinamically?
Thank you!

You can use android:drawableLeft attribute in the TextView. Here's the sample:
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Medium Text"
android:id="#+id/textView"
android:gravity="center_vertical"
android:layout_margin="16dp"
android:drawableLeft="#drawable/ic_launcher"
/>
And the result

I would suggest you using the following
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/button_text"
android:drawableLeft="#drawable/button_icon"
... />
If you are looking for more customized button, then probably you should learn more about Custom Views:
https://developer.android.com/training/custom-views/index.html

What I understand from your question is that you want to change/set the text of the button programmatically.
for this use the following code in onCreate event:
Button mybutton = (Button) findViewById(R.id.your_button_name);
mybutton.setText("Your Text Here");

Hardcoded Text Issues

I'm working on an application in eclipse emulator "Nexus one" and i'm trying to add buttons onto the format. When I add the buttons they are fine. When I add my own text into the button I get a hardcode warning. So I would carry on and add the "#string/" which gets rid of the errors/warnings, but the problem is that the "#string/" shows up as text on the button.
-So how do I make the buttons say just Profile and Calendar without errors and or the #string/
I have no idea on how to fix this. here is code and pictures:
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="#string/Profile"
android:onClick="profile" />
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="#+id/button1"
android:layout_marginTop="20dp"
android:text="#string/Calendar"
android:onClick="calendar"/>

Simple remove #string/ from your android:text attribute. Thus each button would look like this:
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="Profile"
android:onClick="profile" />
#string/my_string_name is used to reference Strings defined in a strings.xml resource file.
The other (and the "proper") way to fix these errors is to define these strings in XML.
If you edit strings.xml and add lines such as <string name="Profile">Profile</string>, these errors will go away, and you will be on the way to having an app that is capable of being easily translated to other languages.