Image Cropper In Flutter

Image Cropper In Flutter :

This flutter tutorial post is image crop.

Crop functionality
1) Choose image from gallery or camera.
2) Provide the functionality crop, rotated and scale.

AndroidManifest.xml

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

Screenshot 1 :

Screenshot 2 :

Screenshot 3 :

pubspec.yaml

name: image_crop
description: A new Flutter application.
version: 1.0.0+1

environment:
  sdk: ">=2.1.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter

  cupertino_icons: ^0.1.2
  image_cropper:
  image_picker:

dev_dependencies:
  flutter_test:
    sdk: flutter

flutter:
  uses-material-design: true

Main.dart

import 'package:flutter/material.dart';
import 'dart:async';
import 'dart:io';

import 'package:image_cropper/image_cropper.dart';
import 'package:image_picker/image_picker.dart';

void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'ImageCropper',
      theme: ThemeData.light().copyWith(primaryColor: Colors.deepOrange),
      home: MyHomePage(
        title: 'ImageCropper',
      ),
    );
  }
}

class MyHomePage extends StatefulWidget {
  final String title;

  MyHomePage({this.title});

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

enum AppState {
  free,
  picked,
  cropped,
}

class _MyHomePageState extends State<MyHomePage> {
  AppState state;
  File imageFile;

  @override
  void initState() {
    super.initState();
    state = AppState.free;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: imageFile != null ? Image.file(imageFile) : Container(),
      ),
      floatingActionButton: FloatingActionButton(
        backgroundColor: Colors.deepOrange,
        onPressed: () {
          if (state == AppState.free)
            _pickImage();
          else if (state == AppState.picked)
            _cropImage();
          else if (state == AppState.cropped) _clearImage();
        },
        child: _buildButtonIcon(),
      ),
    );
  }

  Widget _buildButtonIcon() {
    if (state == AppState.free)
      return Icon(Icons.add);
    else if (state == AppState.picked)
      return Icon(Icons.crop);
    else if (state == AppState.cropped)
      return Icon(Icons.clear);
    else
      return Container();
  }

  Future<Null> _pickImage() async {
    imageFile = await ImagePicker.pickImage(source: ImageSource.gallery);
    if (imageFile != null) {
      setState(() {
        state = AppState.picked;
      });
    }
  }

  Future<Null> _cropImage() async {
    File croppedFile = await ImageCropper.cropImage(
      sourcePath: imageFile.path,
      aspectRatioPresets: Platform.isAndroid
          ? [
              CropAspectRatioPreset.square,
              CropAspectRatioPreset.ratio3x2,
              CropAspectRatioPreset.original,
              CropAspectRatioPreset.ratio4x3,
              CropAspectRatioPreset.ratio16x9
            ]
          : [
              CropAspectRatioPreset.original,
              CropAspectRatioPreset.square,
              CropAspectRatioPreset.ratio3x2,
              CropAspectRatioPreset.ratio4x3,
              CropAspectRatioPreset.ratio5x3,
              CropAspectRatioPreset.ratio5x4,
              CropAspectRatioPreset.ratio7x5,
              CropAspectRatioPreset.ratio16x9
            ],
      androidUiSettings: AndroidUiSettings(
          toolbarTitle: 'Cropper',
          toolbarColor: Colors.deepOrange,
          toolbarWidgetColor: Colors.white,
          initAspectRatio: CropAspectRatioPreset.original,
          lockAspectRatio: false),
    );
    if (croppedFile != null) {
      imageFile = croppedFile;
      setState(() {
        state = AppState.cropped;
      });
    }
  }

  void _clearImage() {
    imageFile = null;
    setState(() {
      state = AppState.free;
    });
  }
}