Request camera pemission

app/src/main/AndroidManifest.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.nekdenis.camera">
-
+    <uses-permission android:name="android.permission.CAMERA" />
     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"

app/src/main/java/com/nekdenis/camera/MainActivity.kt

@@ -1,18 +1,59 @@
 package com.nekdenis.camera
 
+import android.Manifest
+import android.content.pm.PackageManager
 import android.os.Bundle
+import android.widget.Toast
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.compose.material.MaterialTheme
 import androidx.compose.material.Surface
 import androidx.compose.material.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.tooling.preview.Preview
+import androidx.core.app.ActivityCompat
+import androidx.core.content.ContextCompat
 import com.nekdenis.camera.ui.theme.CameraComposeWorkshopTheme
 
 class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+        if (permissionGranted()) {
+            initView()
+        } else {
+            requestPermission()
+        }
+
+    }
+
+    private fun permissionGranted() =
+        ContextCompat.checkSelfPermission(
+            this,
+            Manifest.permission.CAMERA
+        ) == PackageManager.PERMISSION_GRANTED
+
+    private fun requestPermission() {
+        ActivityCompat.requestPermissions(
+            this, arrayOf(Manifest.permission.CAMERA), 0
+        )
+    }
+
+    override fun onRequestPermissionsResult(
+        requestCode: Int,
+        permissions: Array<String?>,
+        grantResults: IntArray
+    ) {
+        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
+        if (requestCode == 0) {
+            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
+                initView()
+            } else {
+                Toast.makeText(this, "camera permission denied", Toast.LENGTH_LONG).show()
+            }
+        }
+    }
+
+    private fun initView() {
         setContent {
             CameraComposeWorkshopTheme {
                 // A surface container using the 'background' color from the theme
@@ -24,6 +65,7 @@ class MainActivity : ComponentActivity() {
     }
 }
 
+
 @Composable
 fun Greeting(name: String) {
     Text(text = "Hello $name!")