Flutter image_cropper plugin error: "You need to use a Theme.AppCompat

I'm using Flutter's image_cropper plugin & it's throwing an error about AppCompat:

java.lang.RuntimeException: Unable to start activity ComponentInfo{uk.co.pottertour.meloan/com.yalantis.ucrop.UCropActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.

What happens is: I launch the camera from my profile edit screen, after the user takes a photo, it should then launch the crop activity, but it throws that error and crashes my entire app.

This has started to happen with the latest image_cropper plugin upgrade, 2.0.3.

  Future getImage(ImageSource _imageSource) async {
    final pickedFile =
        await imagePicker.pickImage(source: _imageSource, imageQuality: 85);
    if(pickedFile == null) return;

    print(LOG   "getImage file from camera path: ${pickedFile.path}");
    _cropImage(pickedFile.path);

    setState(() {
      _image = File(pickedFile.path);
    });
    imageChanged = true;
  }

  Future<Null> _cropImage(String imageFilePath) async {
    final croppedFile = await ImageCropper().cropImage(
        compressQuality: 80,
        sourcePath: imageFilePath,
        maxWidth: 428,
        maxHeight: 428,
        aspectRatioPresets: Platform.isAndroid
            ? [
                CropAspectRatioPreset.square,
              ]
            : [
                CropAspectRatioPreset.square,
              ],
        uiSettings: [
          AndroidUiSettings(
              toolbarTitle: 'Cropper',
              toolbarColor: Colors.deepOrange,
              toolbarWidgetColor: Colors.white,
              initAspectRatio: CropAspectRatioPreset.original,
              lockAspectRatio: true),
          IOSUiSettings(
            title: 'Cropper',
          )
        ]);
    if (croppedFile != null) {
      setState(() {
        _image = File(croppedFile.path);
      });
    }
  }

I tweaked the cropper code, to the revised format suggested in the plugin's readme but to no avail. I wonder if the screen needs to rebuild after the camera completes but because the camera & _cropImage methods are async, it doesn't in time, so Flutter doesn't have appCompat inherited from the root widget from main.dart.

CodePudding user response：

To use the plugin add this to AndroidManifest.xml. Pay attention especially to the last line.

<activity
    android:name="com.yalantis.ucrop.UCropActivity"
    android:screenOrientation="portrait"
    android:theme="@style/Theme.AppCompat.Light.NoActionBar"/>