Fix permission request issue

app/build.gradle.kts

@@ -102,6 +102,7 @@ dependencies {
   implementation(Libs.accompanist_pager)
   implementation(Libs.accompanist_glide)
   implementation(Libs.accompanist_pager_indicators)
+  implementation(Libs.accompanist_permissions)
   implementation(Libs.accompanist_placeholder)
   implementation(Libs.accompanist_navigation_animation)
 

app/src/main/java/com/ericampire/android/androidstudycase/MainActivity.kt

@@ -9,12 +9,15 @@ import androidx.compose.material.Surface
 import com.ericampire.android.androidstudycase.presentation.screen.main.ui.MainScreen
 import com.ericampire.android.androidstudycase.presentation.theme.AndroidStudyCaseTheme
 import com.google.accompanist.pager.ExperimentalPagerApi
+import com.google.accompanist.permissions.ExperimentalPermissionsApi
 import dagger.hilt.android.AndroidEntryPoint
 
 @AndroidEntryPoint
 class MainActivity : ComponentActivity() {
   @ExperimentalMaterialApi
   @ExperimentalPagerApi
+  @ExperimentalPermissionsApi
+
   override fun onCreate(savedInstanceState: Bundle?) {
     super.onCreate(savedInstanceState)
     setContent {

app/src/main/java/com/ericampire/android/androidstudycase/app/AppNavigation.kt

@@ -10,6 +10,7 @@ import com.ericampire.android.androidstudycase.presentation.screen.login.ui.Logi
 import com.ericampire.android.androidstudycase.presentation.screen.preview.ui.PreviewScreen
 import com.ericampire.android.androidstudycase.util.Destination
 import com.google.accompanist.pager.ExperimentalPagerApi
+import com.google.accompanist.permissions.ExperimentalPermissionsApi
 
 @ExperimentalMaterialApi
 fun NavGraphBuilder.addHomeScreen(navController: NavController) {
@@ -34,6 +35,7 @@ fun NavGraphBuilder.addLoginScreen(navController: NavController) {
   }
 }
 
+@ExperimentalPermissionsApi
 fun NavGraphBuilder.addPreviewScreen(navController: NavController) {
   composable(Destination.Preview.route) {
     PreviewScreen(navController = navController)

app/src/main/java/com/ericampire/android/androidstudycase/presentation/custom/LottieAnimationView.kt

@@ -0,0 +1,28 @@
+package com.ericampire.android.androidstudycase.presentation.custom
+
+import androidx.compose.foundation.layout.padding
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+import com.airbnb.lottie.compose.*
+
+@Composable
+fun LottieAnimationView(
+  modifier: Modifier = Modifier,
+  resId: Int
+) {
+  val composition by rememberLottieComposition(
+    spec = LottieCompositionSpec.RawRes(resId)
+  )
+  val progress by animateLottieCompositionAsState(
+    composition = composition,
+    iterations = LottieConstants.IterateForever,
+  )
+
+  LottieAnimation(
+    modifier = modifier.padding(10.dp),
+    composition = composition,
+    progress = progress,
+  )
+}

app/src/main/java/com/ericampire/android/androidstudycase/presentation/screen/main/ui/MainScreen.kt

@@ -25,9 +25,12 @@ import com.ericampire.android.androidstudycase.util.Destination
 import com.google.accompanist.insets.navigationBarsPadding
 import com.google.accompanist.insets.statusBarsPadding
 import com.google.accompanist.pager.ExperimentalPagerApi
+import com.google.accompanist.permissions.ExperimentalPermissionsApi
 
 @ExperimentalMaterialApi
 @ExperimentalPagerApi
+@ExperimentalPermissionsApi
+
 @Composable
 fun MainScreen() {
   val navController = rememberNavController()

app/src/main/java/com/ericampire/android/androidstudycase/presentation/screen/preview/ui/PreviewScreen.kt

@@ -2,17 +2,32 @@ package com.ericampire.android.androidstudycase.presentation.screen.preview.ui
 
 import android.view.LayoutInflater
 import android.widget.Toast
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.Button
+import androidx.compose.material.MaterialTheme
 import androidx.compose.material.Scaffold
+import androidx.compose.material.Text
 import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.dp
 import androidx.compose.ui.viewinterop.AndroidView
 import androidx.navigation.NavController
 import com.budiyev.android.codescanner.CodeScanner
 import com.budiyev.android.codescanner.CodeScannerView
 import com.ericampire.android.androidstudycase.R
+import com.ericampire.android.androidstudycase.presentation.custom.LottieAnimationView
 import com.ericampire.android.androidstudycase.presentation.custom.LottiePreviewDialog
+import com.google.accompanist.permissions.ExperimentalPermissionsApi
+import com.google.accompanist.permissions.PermissionRequired
+import com.google.accompanist.permissions.rememberPermissionState
 
 
+@ExperimentalPermissionsApi
 @Composable
 fun PreviewScreen(navController: NavController) {
 
@@ -20,6 +35,12 @@ fun PreviewScreen(navController: NavController) {
   var lottieFileUrl by remember { mutableStateOf("") }
   val context = LocalContext.current
 
+  val cameraPermissionState = rememberPermissionState(android.Manifest.permission.CAMERA)
+
+  LaunchedEffect(true) {
+    cameraPermissionState.launchPermissionRequest()
+  }
+
   DisposableEffect(true) {
     onDispose {
       codeScanner?.stopPreview()
@@ -27,6 +48,7 @@ fun PreviewScreen(navController: NavController) {
   }
 
   Scaffold(
+    modifier = Modifier.fillMaxSize(),
     content = {
       if (lottieFileUrl.isNotEmpty()) {
         LottiePreviewDialog(
@@ -40,6 +62,25 @@ fun PreviewScreen(navController: NavController) {
           }
         )
       }
+      PermissionRequired(
+        permissionState = cameraPermissionState,
+        permissionNotGrantedContent = {
+          PermissionNotAvailableContent(
+            descriptionMessage = stringResource(R.string.txt_camera_permssion_required),
+            onPermissionRequest = {
+              cameraPermissionState.launchPermissionRequest()
+            }
+          )
+        },
+        permissionNotAvailableContent = {
+          PermissionNotAvailableContent(
+            descriptionMessage = stringResource(R.string.txt_permission_denied),
+            onPermissionRequest = {
+              cameraPermissionState.launchPermissionRequest()
+            }
+          )
+        },
+        content = {
           AndroidView(
             factory = { context ->
               val view = LayoutInflater.from(context).inflate(R.layout.code_scanner, null, false)
@@ -56,4 +97,49 @@ fun PreviewScreen(navController: NavController) {
           )
         }
       )
+    }
+  )
+}
+
+@Composable
+fun PermissionNotAvailableContent(
+  descriptionMessage: String,
+  onPermissionRequest: () -> Unit
+) {
+  Box(
+    modifier = Modifier.fillMaxSize(),
+    contentAlignment = Alignment.Center,
+    content = {
+      Column(
+        modifier = Modifier.padding(16.dp),
+        verticalArrangement = Arrangement.spacedBy(16.dp),
+        horizontalAlignment = Alignment.CenterHorizontally,
+        content = {
+          LottieAnimationView(
+            modifier = Modifier.size(200.dp),
+            resId = R.raw.camera_moving
+          )
+          Text(
+            modifier = Modifier.padding(horizontal = 16.dp),
+            text = descriptionMessage,
+            textAlign = TextAlign.Center
+          )
+          Spacer(modifier = Modifier.height(8.dp))
+          Button(
+            modifier = Modifier
+              .width(200.dp)
+              .height(50.dp),
+            shape = RoundedCornerShape(32.dp),
+            onClick = onPermissionRequest,
+            content = {
+              Text(
+                text = stringResource(R.string.txt_request),
+                style = MaterialTheme.typography.h6
+              )
+            }
+          )
+        }
+      )
+    }
+  )
 }

app/src/main/res/values/strings.xml

@@ -1,3 +1,5 @@
 <resources>
     <string name="txt_featured_animation">Featured Animations</string>
+    <string name="txt_open_setting">Open Settings</string>
+    <string name="txt_request">Request permission</string>
 </resources>

i18n/src/main/res/values/strings.xml

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-
+    <string name="txt_featured_animation">Featured Animations</string>
+    <string name="txt_open_setting">Open Settings</string>
     <string name="app_name">Lottiefile App</string>
     <string name="txt_home">Home</string>
     <string name="txt_explore">Explore</string>
@@ -16,4 +17,8 @@
     <string name="txt_hello_stranger">Hello Stranger</string>
     <string name="txt_featured_animator">Featured Animators</string>
     <string name="txt_latest_story">Latest Stories</string>
+    <string name="txt_permission_not_available">Permission Not available</string>
+    <string name="txt_feature_not_available">Feature not available</string>
+    <string name="txt_camera_permssion_required">The camera is important for this app. Please grant the permission.</string>
+    <string name="txt_permission_denied">Camera permission denied. See this FAQ with information about why we need this permission. Please, grant us access on the Settings screen.</string>
 </resources>