Gallery Permission

Gallery Permission.kt

Manifest::

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
  
MainActivity:

package com.iliyadev.gallerypermission

import android.app.Activity
import android.content.Intent
import android.graphics.Bitmap
import android.os.Bundle
import android.provider.MediaStore
import android.view.View
import android.widget.Button
import android.widget.ImageView

class MainActivity : Activity() {

    private val PICK_IMAGE_REQUEST = 1
    private lateinit var imageView: ImageView
    private lateinit var openGalleryButton: Button

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

        imageView = findViewById(R.id.imageView)
        openGalleryButton = findViewById(R.id.openGalleryButton)

        openGalleryButton.setOnClickListener {
            openGallery()
        }
    }

    private fun openGallery() {
        val intent = Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI)
        startActivityForResult(intent, PICK_IMAGE_REQUEST)
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)

        if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null) {
            val imageUri = data.data
            val bitmap: Bitmap = MediaStore.Images.Media.getBitmap(contentResolver, imageUri)
            imageView.setImageBitmap(bitmap)
        }
    }
}

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">

    <Button
        android:id="@+id/openGalleryButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="Open Gallery"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.499" />

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_above="@id/openGalleryButton"
        android:scaleType="fitCenter"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>