How to call Implicit Intent

 ACTIVITY MAIN.XML

<?xml version="1.0" encoding="utf-8"?>

<androidx.constraintlayout.widget.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=".MainActivity">

    <ImageView

        android:id="@+id/ivPhoto"

        android:layout_width="270dp"

        android:layout_height="450dp"

        android:layout_margin="20dp"

        android:scaleType="centerCrop"

        app:layout_constraintBottom_toTopOf="@+id/btnchoose"

        app:layout_constraintEnd_toEndOf="parent"

        app:layout_constraintHorizontal_bias="0.496"

        app:layout_constraintStart_toStartOf="parent" />

    <Button

        android:id="@+id/btnchoose"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Choose"

        app:layout_constraintBottom_toBottomOf="parent"

        app:layout_constraintEnd_toEndOf="parent"

        app:layout_constraintStart_toStartOf="parent"

        app:layout_constraintTop_toTopOf="parent"

        app:layout_constraintVertical_bias="0.84" />

</androidx.constraintlayout.widget.ConstraintLayout>

MAIN ACTIVITY

package com.example.image

import android.app.Activity
import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import kotlinx.android.synthetic.main.activity_main.*

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

        btnchoose.setOnClickListener {
            Intent(Intent.ACTION_GET_CONTENT).also {
                it.type="image/*"
                startActivityForResult(it,0)
            }
        }
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        if(resultCode== Activity.RESULT_OK && requestCode==0)
        {
            val uri = data?.data
            ivPhoto.setImageURI(uri)
        }
    }
}