Develop Reference

Add un text onto an image programmatically using Kotlin

I have a image "myXmlImage" in my .xml file
In the .kt file, I want to paste another "newImage" image as well as a little text "newText".
myXmlImage.setImageDrawable(newImage.drawable)
myXmlImage.imageMatrix = newImage.imageMatrix
So far it has been working very well and the new image is in place.
I'm completely stuck on how to paste the little "newText" into it
Any ideas will be greatly appreciated, thanks in advance.

Perhaps there's more than what you've described here. But if those are really your only specifications, then what you're asking for is really easy.
I'm assuming that your xml file has a root of ConstraintLayout. If it doesn't, then you're going to either want to change it or at least wrap your ImageView inside of a ConstraintLayout.
Use the layout editor to place a TextView inside of your ImageView (NOT AS A CHILD; when I say "inside", I mean spacially inside). If you haven't used the layout editor very much, it might take you a couple of tries to place the TextView inside. Don't just drag it into the ImageView as if it were a child. Drag it and drop it under the ImageView inside of the ConstraintLayout and then use little circles on the sides to attach it to the sides of the ImageView. Don't forget to set the text of the TextView as "".
(I'm not actually sure if this step is necessary because I don't know what the default background of a TextView is, but I do it out of habit.)When you're done placing that TextView inside of the ImageView, go the code of your xml file and use android:background="#00FFFFFF" (or maybe somewhere in your project you have either a transparent background drawable or a transparent #color that you can reference by name).
I'm sure you know the rest. Just give that TextView an Id like newtext and inside of your activity retrieve the view: newText:TextView=findViewById(R.id.newtext). And then set the text: newText.text="new text".

Change layout template in Android Studio

The old Android Studio used to create the layout files using RelativeLayout, but the new one use ConstraintLayout, and this let me very pissed off >:[ , cause it have to import and sync... I really do not like.
I do not used to use both (RelativeLayout or ConstraintLayout), I prefer LinearLayout vertical, but I did not find how I can change the layout template in order to Android Studio create a layout using LinearLayout vertical, Anyone knows?
I looked for in Preferences -> File and Code Templates however I didn't find where I can change the xml layout template...
Thx

I'm not sure if you can do that, so just replace relative with linear in the xml & don't forget to add to add the orientation

Just delete the content in the layout file, and use the linear layout in that file

error with fab button design with vector assets

I have used the dependencies to be used as suggested. below is the pic.
build_gradle(module)
now I have selected a black plus icon from vector assets and named it as fab_plus, now I have this file in my drawable folder.
fab_plus_XML
now I tried to used that fab_plus_XML like this. Pic below.
activity_main
Now my question is why is the fab_plus is showing in red.
thanks in advance. pls, help me, someone.

There are two things wrong with the way you are specifying the drawable. To refer to a drawable within your project, you simply use #drawable/your_drawable and to allow backward compatibility of VectorDrawables you should use app:srcCompat as per the guidance.
So in your ImageView, instead of
android:src="#android:drawable/fab_plus"
you should have
app:srcCompat="#drawable/fab_plus"
You will also need to make sure the app namespace is included at the top of your layout xmlns:app="http://schemas.android.com/apk/res-auto" along with the current android and tools namespaces.

you need to use:
app:srcCompat
instead of
android:src
but the tooltip there should exactly tell you this and AFAIR even offer a quick-fix

How to change a resource icon in a imageview with another resource icon

I have been reading some post about changing an image in an ImageView.
But everyone asks for setting an ImageView with a custom image, and I want to set a system image inside it.
I made this:
ledicon.setImageDrawable(getResources().getDrawable(R.drawable.presence_busy));
But Eclipse tells me that presence_busy is not recognized.
Why?
I am using presence_online in the XML file,
android:src="#android:drawable/presence_online"
and all works perfectly.

Try this:
ledicon.setImageDrawable(getResources().getDrawable(android.R.drawable.presence_busy));
(When accessing system resouces you have to look them um in android.R not your own.)

How to change background image of a ImageButton in android

I am facing a situation in which-
1.First I have to set the background image of a ImageButton to a default image.
2.Now at runtime based on some condition I have to change the background image of that ImageButton to some other image.
I have tried this but it doesn't work and the background image remains to default image and
doesn't change.
btn.invalidateDrawable((Drawable)getResources().getDrawable(R.drawable.info));
btn.setBackgroundDrawable((Drawable)getResources().getDrawable(R.drawable.infonewred));
How can I achieve this goal.

Have you tried btn.setBackgroundResource(R.drawable.infonewred).

I suggest you set the "default" Background directly in your XML-Layout-File via android:background.
If you have to change the Background in Runtime just use btn.setBackgroundResource(R.drawable.imagename);

since you haven't provided xml, i am guessing you are providing src to imageButton.. so to change the source of the image , what you are doing is changing the image background which will not be visible since it is the source which will be visible to you.. so to change source..
do this.
btn.setImageDrawable()
rather than..
btn.setBackgroundDrawable()

I know that's old but i got the solution as i'm also was searching for that, the correct answer is to use setImageResource , so the code will be like that:
btn.invalidateDrawable(getResources().getDrawable(R.drawable.info));
btn.setImageResource(R.drawable.infonewred);

Try the method setImageResource
Ex:
if(someCondition()){
btn.setImageResource(R.drawable.info);
} else {
btn.setImageResource(R.drawable.infonewred);
}

Just try following code to change at runtime and for default view set background property in layout xml:
if(yourCondition)
btn.setBackgroundResource(R.drawable.infonewred);

in activity file you can write
btn.setBackgroundResource(R.drawable.sliderr);
OR
in your xml layout file you can add one extra line to you button xml code
android:src="#drawable/sliderr"