[camerax] Loosen restrictions of fallback strategies for choosing resolutions (flutter#5239)

Changes the fallback strategies for camera use cases to still choose a lower quality resolution if the desired one is not available, but if not successful, it will attempt to choose a higher quality resolution versus throwing an exception.

Documentation on fallback strategies:
https://developer.android.com/reference/androidx/camera/core/resolutionselector/ResolutionStrategy
https://developer.android.com/reference/androidx/camera/video/FallbackStrategy (for video only)

Fix attempt for flutter#135293.

Author: camsim99

packages/camera/camera_android_camerax/CHANGELOG.md

@@ -1,3 +1,8 @@
+## 0.5.0+21
+
+* Changes fallback resolution strategies for camera use cases to look for a higher resolution if neither the desired
+  resolution nor any lower resolutions are available.
+
 ## 0.5.0+20
 
 * Implements `setZoomLevel`.

packages/camera/camera_android_camerax/lib/src/android_camera_camerax.dart

@@ -857,7 +857,8 @@ class AndroidCameraCameraX extends CameraPlatform {
   /// closest lower resolution available.
   ResolutionSelector? _getResolutionSelectorFromPreset(
       ResolutionPreset? preset) {
-    const int fallbackRule = ResolutionStrategy.fallbackRuleClosestLower;
+    const int fallbackRule =
+        ResolutionStrategy.fallbackRuleClosestLowerThenHigher;
 
     Size? boundSize;
     ResolutionStrategy? resolutionStrategy;
@@ -937,7 +938,7 @@ class AndroidCameraCameraX extends CameraPlatform {
     // We will choose the next highest video quality if the one desired
     // is unavailable.
     const VideoResolutionFallbackRule fallbackRule =
-        VideoResolutionFallbackRule.lowerQualityThan;
+        VideoResolutionFallbackRule.lowerQualityOrHigherThan;
     final FallbackStrategy fallbackStrategy =
         _shouldCreateDetachedObjectForTesting
             ? FallbackStrategy.detached(

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: 0.5.0+20
+version: 0.5.0+21
 
 environment:
   sdk: ">=2.19.0 <4.0.0"

packages/camera/camera_android_camerax/test/android_camera_camerax_test.dart

@@ -342,7 +342,7 @@ void main() {
       // resolution.
       expectedResolutionStrategy ??= ResolutionStrategy.detached(
           boundSize: expectedBoundSize,
-          fallbackRule: ResolutionStrategy.fallbackRuleClosestLower);
+          fallbackRule: ResolutionStrategy.fallbackRuleClosestLowerThenHigher);
 
       expect(camera.preview!.resolutionSelector!.resolutionStrategy!.boundSize,
           equals(expectedResolutionStrategy.boundSize));
@@ -431,7 +431,7 @@ void main() {
       }
 
       const VideoResolutionFallbackRule expectedFallbackRule =
-          VideoResolutionFallbackRule.lowerQualityThan;
+          VideoResolutionFallbackRule.lowerQualityOrHigherThan;
       final FallbackStrategy expectedFallbackStrategy =
           FallbackStrategy.detached(
               quality: expectedVideoQuality,