Kotlin: How to get and set a text to TextView in Android using Kotlin?

Question

I want to change text of TextView While click on it.

My code:

val text: TextView = findViewById(R.id.android_text) as TextView
    text.setOnClickListener {
        text.setText(getString(R.string.name))
    }

Output: I got the output but showing use property access syntax.

How can one do this?

Answer 1

In kotlin don't use getters and setters as like in java.The correct format of the kotlin is given below.

val textView: TextView = findViewById(R.id.android_text) as TextView
textView.setOnClickListener {
    textView.text = getString(R.string.name)
}

To get the values from the Textview we have to use this method

 val str: String = textView.text.toString()

 println("the value is $str")

Answer 2

just add below line and access direct xml object

import kotlinx.android.synthetic.main.activity_main.*

override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        txt_HelloWorld.text = "abc"
    }

replace activity_main according to your XML name

Answer 3

to set text in kotlin

textview.text = "write here"

Answer 4

Find the text view from the layout.

val textView : TextView = findViewById(R.id.android_text) as TextView

Setting onClickListener on the textview.

textview.setOnClickListener(object: View.OnClickListener {
    override fun onClick(view: View): Unit {
        // Code here.
        textView.text = getString(R.string.name)
    }
})

Argument parentheses can be omitted from View.setOnClickListener if we pass a single function literal argument. So, the simplified code will be:

textview.setOnClickListener {
    // Code here.
    textView.text = getString(R.string.name)
}

Answer 5

Use textView.text for getter and setter, ex:

val textView = findViewById<TextView>(R.id.textView)
// Set text
textView.text = "Hello World!"
// Get text
val textViewString = textView.text.toString()

Answer 6

• go to build.gradle(:app) file

add dependencies{

 apply plugin: 'kotlin-android'
    apply plugin: 'kotlin-android-extensions'

• after that go to your Activity file and write this line

import kotlinx.android.synthetic.main.activity_main.*

Done!!

now you may direct find your widget using their id.

Thanks

Answer 7

Kotlin synthetics have deprecated therefore you can use bindingView method. after implementing basefragment or baseActivity you can use binding as in below:

binding.textView.text ="type your text here"

Answer 8

Yes its late - but may help someone on reference

xml with EditText, Button and TextView

onClick on Button will update the value from EditText to TextView

        <EditText
            android:id="@+id/et_id"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>

        <Button
            android:id="@+id/btn_submit_id"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>

        <TextView
            android:id="@+id/txt_id"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>

Look at the code do the action in your class

Don't need to initialize the id's of components like in Java. You can do it by their xml Id's

override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_sample)

        btn_submit_id.setOnClickListener {
            txt_id.setText(et_id.text);
        }
    }

also you can set value in TextView like,

textview.text = "your value"

Answer 9

import kotlinx.android.synthetic.main.MainActivity.*

class Mainactivity : AppCompatActivity() {


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.MainActivity)

        txt.setText("hello Kotlin")

    }

}

Answer 10

  <TextView
        android:id="@+id/usage"
        android:layout_marginTop="220dip"
        android:layout_marginLeft="45dip"
        android:layout_marginRight="15dip"
        android:typeface="serif"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Google "
        android:textColor="#030900"/>


usage.text="hello world"

Answer 11

findViewById(R.id.android_text) does not need typecasting.

Answer 12

This procedure works for me:

Go to build.gradle(Module: -> after dependencies { add these lines:

apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'

You can watch the video in this link.

Answer 13

The top post has 'as TextView' appended on the end. You might get other compiler errors if you leave this on. The following should be fine.

val text: TextView = findViewById(R.id.android_text) as TextView

Where 'android_text' is the ID of your textView