[camerax] Revert "Explicitly remove READ_EXTERNAL_STORAGE permission" (#7826)

Reverts logic to remove `READ_EXTERNAL_STORAGE` permission from merged Android manifest (between plugins and Flutter app) by default. Turns out that this logic conflicts with Flutter plugins/apps that actually require the `READ_EXTERNAL_STORAGE` permission.

Specifically, reverts #4716 and adds documentation so that users know how to manually remove `READ_EXTERNAL_STORAGE`  from the merged manifest if they wish. 

Fixes flutter/flutter#156198 and adds documentation to address flutter/flutter#131116.

Author: camsim99

packages/camera/camera_android_camerax/CHANGELOG.md

@@ -1,3 +1,9 @@
+## 0.6.10
+
+* Removes logic that explicitly removes `READ_EXTERNAL_STORAGE` permission that may be implied
+  from `WRITE_EXTERNAL_STORAGE` and updates the README to tell users how to manually
+  remove it from their app's merged manifest if they wish.
+
 ## 0.6.9+2
 
 * Updates Java compatibility version to 11.

packages/camera/camera_android_camerax/README.md

@@ -57,8 +57,21 @@ and thus that parameter will silently be ignored.
 
 In order to save captured images and videos to files on Android 10 and below, CameraX
 requires specifying the `WRITE_EXTERNAL_STORAGE` permission (see [the CameraX documentation][10]).
-This is already done in the plugin, so no further action is required on your end. To understand
-the implications of specificying this permission, see [the `WRITE_EXTERNAL_STORAGE` documentation][11].
+This is already done in the plugin, so no further action is required on your end.
+
+To understand the privacy impact of specifying the `WRITE_EXTERNAL_STORAGE` permission, see the
+[`WRITE_EXTERNAL_STORAGE` documentation][11]. We have seen apps also have the [`READ_EXTERNAL_STORAGE`][13]
+permission automatically added to the merged Android manifest; it appears to be implied from
+`WRITE_EXTERNAL_STORAGE`. If you do not want the `READ_EXTERNAL_STORAGE` permission to be included
+in the merged Android manifest of your app, then take the following steps to remove it:
+
+1. Ensure that your app nor any of the plugins that it depends on require the `READ_EXTERNAL_STORAGE` permission.
+2. Add the following to your app's `your_app/android/app/src/main/AndroidManifest.xml`:
+
+```xml
+  <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"
+    tools:node="remove" />
+```
 
 ### Allowing image streaming in the background
 
@@ -91,4 +104,5 @@ For more information on contributing to this plugin, see [`CONTRIBUTING.md`](CON
 [10]: https://developer.android.com/media/camera/camerax/architecture#permissions
 [11]: https://developer.android.com/reference/android/Manifest.permission#WRITE_EXTERNAL_STORAGE
 [12]: https://developer.android.com/reference/android/Manifest.permission#FOREGROUND_SERVICE_CAMERA
+[13]: https://developer.android.com/reference/android/Manifest.permission#READ_EXTERNAL_STORAGE
 [148013]: https://github.com/flutter/flutter/issues/148013

packages/camera/camera_android_camerax/android/src/main/AndroidManifest.xml

@@ -1,11 +1,8 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-  xmlns:tools="http://schemas.android.com/tools"
   package="io.flutter.plugins.camerax">
   <uses-feature android:name="android.hardware.camera.any" />
   <uses-permission android:name="android.permission.CAMERA" />
   <uses-permission android:name="android.permission.RECORD_AUDIO" />
   <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
     android:maxSdkVersion="28" />
-  <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"
-    tools:node="remove" />
 </manifest>

packages/camera/camera_android_camerax/pubspec.yaml

@@ -2,7 +2,7 @@ name: camera_android_camerax
 description: Android implementation of the camera plugin using the CameraX library.
 repository: https://github.com/flutter/packages/tree/main/packages/camera/camera_android_camerax
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+camera%22
-version: 0.6.9+2
+version: 0.6.10
 
 environment:
   sdk: ^3.5.0