How can realized btn logic?

Question

Hello for everyone!
I have 2 TextView in my activity_main.xml
First TextView (text) serves as a text, the second TextView (btn) serves as a button.
The text include huge text includes 20 lines, but i need to make it look short(3 lines) on the layout. For example: | It some text on 20 lines. It some text on 20 lines. It some text on 20 lines... |
The btn which under the first TextView with the name "Read more" should open the text in full size and renamed itself "Read less". When we click again on this btn we need to transform the name of btn from "Read less" to "Read more" and collapse expanded text to 3 lines. All this logic must be executed an unlimited number of times when this button is pressed. So, what i need to write in MainActivity.kt for btn?

Answer 1

Keep flag = false globally

if(!flag) {

flag = true
setText = "Read less"
setLength = synopsis.length()

}
else {

flag = false
setText = "Read more"
setLength = 3

}

It should look something like this. Note, this is an abstract overview to give you an idea, not the actual code.

Answer 2

just add:

else {
btnRead.text = "Read less"
flag = true
}

Looking at the code, I can't tell what `synopsis` is, you can make the changes to `synopsis.maxLines` accordingly

Answer 3

You don't need another listener inside the first if statement. Each time you press the button, the listener function is automatically called. You don't have to handle the multiple iterations yourself. Just write the code for a single iteration for each flag = true and false = false respectively.

Answer 4

You're welcome. I'm glad it worked 😄

Answer 5

Check this out

1. https://stackoverflow.com/questions/15627530/android-expandable-textview-with-animation

2. https://stackoverflow.com/questions/19099296/set-text-view-ellipsize-and-add-view-more-at-end

Answer 6

P.S.: I am more familiar with Java, so pardon me for my lack of knowledge in Kotlin.

Answer 7

Infinity
Thanks a lot! I wrote the next code a few moment later:
btnRead.setOnClickListener {
if (flag == true){
btnRead.text = "Read less"
synopsis.maxLines = 20
flag = false
} else {
btnRead.text = "Read more"
synopsis.maxLines = 3
flag = true
}
}
It's working fine 😁

Answer 8

@Infinity , I find the solution:
var flag = false
btnRead.setOnClickListener {
btnRead.text = "Read less"
synopsis.maxLines = synopsis.length()
flag = true
if (flag == true){
btnRead.setOnClickListener {
btnRead.text = "Read more"
synopsis.maxLines = 3
flag = false
}
}
}

But it work only works once, how to make this logic work as many times as I need to press the button?

Answer 9

Infinity
Synopsis is my TextView which need expand and shrink

Answer 10

Infinity i dont what i doing wrong, but your 'else' body doesn't work 😥

Answer 11

Infinity sorry for my stupid, I'm a beginner in programming. Can you provide an example, how it will be seen?!

Answer 12

You can use OnCklickListener