https://github.com/githuseyingur/native_kotlin_codes_in_flutter
See how Kotlin codes works in Flutter, doing tasks and showing results on the Flutter side.
https://github.com/githuseyingur/native_kotlin_codes_in_flutter
flutter-kotlin flutter-kotlin-code flutter-native flutter-native-code flutter-plugin flutter-with-kotlin kotlin-code-in-flutter kotlin-in-flutter native-code-in-flutter
Last synced: about 1 year ago
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See how Kotlin codes works in Flutter, doing tasks and showing results on the Flutter side.
- Host: GitHub
- URL: https://github.com/githuseyingur/native_kotlin_codes_in_flutter
- Owner: githuseyingur
- Created: 2024-03-08T14:58:37.000Z (about 2 years ago)
- Default Branch: main
- Last Pushed: 2024-03-11T10:24:02.000Z (about 2 years ago)
- Last Synced: 2025-01-28T14:19:18.097Z (over 1 year ago)
- Topics: flutter-kotlin, flutter-kotlin-code, flutter-native, flutter-native-code, flutter-plugin, flutter-with-kotlin, kotlin-code-in-flutter, kotlin-in-flutter, native-code-in-flutter
- Language: Dart
- Homepage:
- Size: 322 KB
- Stars: 1
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# NATIVE CODE IN FLUTTER WITH KOTLIN
This repository is a demo about using Kotlin in Flutter to perform different operations and transfer the results to Flutter.
* Reading a json file with countries and their capitals and displaying the read values as a list on the Flutter side.
* Accessing the phone's gallery, having the user select an image and showing this image on the Flutter side.
* Accessing the phone's camera with permissions, having the user take a photo and showing this photo on the Flutter side.
```dart
static const platform = MethodChannel('my_channel');
```
## Invoke Methods (main.dart)
```dart
String jsonString = await platform.invokeMethod('getJsonStringOfCapitals');
var base64Result = await platform.invokeMethod('selectImageInAlbum');
var base64Result = await platform.invokeMethod('takePhoto');
```
## Native (MainActivity.kt)
### Describing Request Codes For Opening Gallery & Camera
```kts
class MainActivity: FlutterActivity() {
val CAMERA_REQUEST_CODE = 200
val GALLERY_REQUEST_CODE = 300
```
### Features
#### 1) Reading a json file with countries and their capitals
* reading the json file
```kts
if(call.method == "getJsonStringOfCapitals") {
lateinit var jsonString: String
try {
jsonString = context.assets.open("country-by-capital-city.json").bufferedReader().use { it.readText()}
result.success(jsonString)
} catch (ex: Exception) {
ex.printStackTrace()
}
}
```
We use `result.success` to access the result on the Flutter side.
#### 2) Accessing the phone's gallery
* open gallery
```kts
if(call.method == "selectImageInAlbum"){
mResult = result
val intent = Intent(Intent.ACTION_GET_CONTENT)
intent.type = "image/*"
if (intent.resolveActivity(packageManager) != null) {
startActivityForResult(intent, GALLERY_REQUEST_CODE)
}
}
```
* onActivityResult
```kts
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
if (resultCode == RESULT_OK) {
if (requestCode == GALLERY_REQUEST_CODE) {
var selectedImageUri = data?.getData()
if (selectedImageUri != null) {
val inputStream: InputStream = contentResolver.openInputStream(selectedImageUri)!!
val bytes = ByteArray(inputStream.available())
inputStream.read(bytes)
inputStream.close()
val base64Image = Base64.encodeToString(bytes, Base64.DEFAULT)
mResult.success(base64Image)
}
}
```
#### 3) Accessing the phone's camera with permissions
* permission control
```kts
if(call.method == "takePhoto"){
mResult = result
if (ContextCompat.checkSelfPermission(applicationContext,android.Manifest.permission.CAMERA ) == PackageManager.PERMISSION_GRANTED) {
openCamera()
} else {
ActivityCompat.requestPermissions(
this,
arrayOf(android.Manifest.permission.CAMERA),
CAMERA_REQUEST_CODE
)
}
}
```
* the method that opens the camera
```kts
private fun openCamera() {
val intent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)
startActivityForResult(intent, CAMERA_REQUEST_CODE)
}
```
* permission result
```kts
override fun onRequestPermissionsResult(
requestCode: Int,
permissions: Array,
grantResults: IntArray
) {
when (requestCode) {
CAMERA_REQUEST_CODE -> {
if (grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// Kullanıcı kamera iznini verdi, kamera açma işlemine devam et
openCamera()
} else {
// Kullanıcı kamera iznini reddetti, hata mesajı göster veya başka bir işlem yap
mResult.error("PERMISSION_DENIED", "Kamera izni reddedildi.", null)
}
}
// Diğer izin istek kodlarını işleyebilirsiniz (gerektiğinde)
}
}
```
* onActivityResult
```kts
// inside of if (resultCode == RESULT_OK) {
if (requestCode == CAMERA_REQUEST_CODE ) {
val photo: Bitmap = data?.extras?.get("data") as Bitmap
val base64Image: String = convertBitmapToBase64(photo)
mResult.success(base64Image)
}
```