[camera] Handle empty grantResults on permission request (#6758)

* [camera] Handle empty grantResults on permission request

* update changelog and add test

* fix typo

* format

* Update packages/camera/camera_android/CHANGELOG.md

Co-authored-by: Camille Simon <43054281+camsim99@users.noreply.github.com>

Co-authored-by: Camille Simon <43054281+camsim99@users.noreply.github.com>

Author: davidmartos96

packages/camera/camera_android/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.10.0+5
+
+* Fixes `ArrayIndexOutOfBoundsException` when the permission request is interrupted.
+
 ## 0.10.0+4
 
 * Upgrades `androidx.annotation` version to 1.5.0.

packages/camera/camera_android/android/src/main/java/io/flutter/plugins/camera/CameraPermissions.java

@@ -105,7 +105,9 @@ public boolean onRequestPermissionsResult(int id, String[] permissions, int[] gr
       }
 
       alreadyCalled = true;
-      if (grantResults[0] != PackageManager.PERMISSION_GRANTED) {
+      // grantResults could be empty if the permissions request with the user is interrupted
+      // https://developer.android.com/reference/android/app/Activity#onRequestPermissionsResult(int,%20java.lang.String[],%20int[])
+      if (grantResults.length == 0 || grantResults[0] != PackageManager.PERMISSION_GRANTED) {
         callback.onResult(CAMERA_ACCESS_DENIED, CAMERA_ACCESS_DENIED_MESSAGE);
       } else if (grantResults.length > 1 && grantResults[1] != PackageManager.PERMISSION_GRANTED) {
         callback.onResult(AUDIO_ACCESS_DENIED, AUDIO_ACCESS_DENIED_MESSAGE);

packages/camera/camera_android/android/src/test/java/io/flutter/plugins/camera/CameraPermissionsTest.java

@@ -72,4 +72,18 @@ public void callback_doesNotRespond() {
     verify(fakeResultCallback, never())
         .onResult("AudioAccessDenied", "Audio access permission was denied.");
   }
+
+  @Test
+  public void callback_respondsWithCameraAccessDeniedWhenEmptyResult() {
+    // Handles the case where the grantResults array is empty
+
+    ResultCallback fakeResultCallback = mock(ResultCallback.class);
+    CameraRequestPermissionsListener permissionsListener =
+        new CameraRequestPermissionsListener(fakeResultCallback);
+
+    permissionsListener.onRequestPermissionsResult(9796, null, new int[] {});
+
+    verify(fakeResultCallback)
+        .onResult("CameraAccessDenied", "Camera access permission was denied.");
+  }
 }

packages/camera/camera_android/pubspec.yaml

@@ -2,7 +2,7 @@ name: camera_android
 description: Android implementation of the camera plugin.
 repository: https://github.com/flutter/plugins/tree/main/packages/camera/camera_android
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+camera%22
-version: 0.10.0+4
+version: 0.10.0+5
 
 environment:
   sdk: ">=2.14.0 <3.0.0"