<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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/photoImageView"
        android:layout_width="352dp"
        android:layout_height="394dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:srcCompat="@android:color/holo_blue_dark" />

    <Button
        android:id="@+id/btnCamera"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginBottom="8dp"
        android:text="Start Camera"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/photoImageView" />
</android.support.constraint.ConstraintLayout>

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

        btnCamera.setOnClickListener {
            val callCameraIntent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)
            if(callCameraIntent.resolveActivity(packageManager) != null) {
                startActivityForResult(callCameraIntent, CAMERA_REQUEST_CODE)
            }
        }
    }

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

        when(requestCode){
            CAMERA_REQUEST_CODE -> {
                if(resultCode == Activity.RESULT_OK && data != null){
                    photoImageView.setImageBitmap(data.extras.get("data") as Bitmap)
                }
            }
            else -> {
                Toast.makeText(this, "Unrecognized request code", Toast.LENGTH_SHORT).show()
            }
        }
    }

class MainActivity : AppCompatActivity() {

    val CAMERA_REQUEST_CODE = 0

    override fun onCreate(savedInstanceState: Bundle?) {

package com.pioneras.appcampioneras

import android.app.Activity
import android.content.Intent
import android.graphics.Bitmap
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.provider.MediaStore
import android.widget.Toast
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

    val CAMERA_REQUEST_CODE = 0

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

        btnCamera.setOnClickListener {
            val callCameraIntent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)
            if(callCameraIntent.resolveActivity(packageManager) != null) {
                startActivityForResult(callCameraIntent, CAMERA_REQUEST_CODE)
            }
        }
    }

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

        when(requestCode){
            CAMERA_REQUEST_CODE -> {
                if(resultCode == Activity.RESULT_OK && data != null){
                    photoImageView.setImageBitmap(data.extras.get("data") as Bitmap)
                }
            }
            else -> {
                Toast.makeText(this, "Unrecognized request code", Toast.LENGTH_SHORT).show()
            }
        }
    }
}