Folio Reader Android In Flutter

Parveen Baghel

31 July 2023

We’ll integrate the native Folio Reader Android SDK in a Flutter project using the Method Channel.

For the purpose of implementing various functionality in your Flutter project, Flutter offers various dependencies. However, some libraries might not be offered by Flutter or might not be of the same caliber as native SDKs. Therefore, we incorporate native SDKs into the Flutter project.

Flutter offers a variety of libraries for opening epub files, this one meets my needs.

Additionally, you may read more about Mobikul’s Flutter app development services.

Let’s now look at how to incorporate native SDK into a Flutter app.

Create New Flutter App name – Flutter With Folio Reader.

Main.dart

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: true,
      title: 'Folio Reader With Flutter',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(),
    );
  }
}

import 'package:flutter/material.dart';

import 'package:flutter/services.dart';

void main() {

runApp(const MyApp());

}

class MyApp extends StatelessWidget {

const MyApp({super.key});

@override

Widget build(BuildContext context) {

return MaterialApp(

debugShowCheckedModeBanner: true,

title: 'Folio Reader With Flutter',

theme: ThemeData(

colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),

useMaterial3: true,

home: const MyHomePage(),

);

}

HomePage.dart

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key});

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {

  //Method Channel
  var methodChannel = const MethodChannel("folio_reader_sdk");

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: const Text("Folio Reader with Flutter"),
      ),
      body: Center(
        child: TextButton(
          onPressed: _openSdk,
          child: const Text("Open Folio Reader"),
        ),
      ),
    );
  }

  void _openSdk() async {
    try {
      await methodChannel.invokeMethod("openFolioSDK", "");
    } on PlatformException catch (e) {
       debugPrint("Failed to Invoke: '${e.message}'.");
    }
  }

}

class MyHomePage extends StatefulWidget {

const MyHomePage({super.key});

@override

State<MyHomePage> createState() => _MyHomePageState();

}

class _MyHomePageState extends State<MyHomePage> {

//Method Channel

var methodChannel = const MethodChannel("folio_reader_sdk");

@override

Widget build(BuildContext context) {

return Scaffold(

appBar: AppBar(

backgroundColor: Theme.of(context).colorScheme.inversePrimary,

title: const Text("Folio Reader with Flutter"),

body: Center(

child: TextButton(

onPressed: _openSdk,

child: const Text("Open Folio Reader"),

);

}

void _openSdk() async {

try {

await methodChannel.invokeMethod("openFolioSDK", "");

} on PlatformException catch (e) {

debugPrint("Failed to Invoke: '${e.message}'.");

}

Why Do We Require Method Channel?

One of the biggest challenges for mobile cross-platform frameworks is how to achieve native performance
how to help developers create different kinds of features for different devices and platforms with as little effort as possible.
In doing so, we need to keep in mind that UX should remain the same but with unique components that are specific for each particular platform (Android and iOS).

To Know about Method Channel read this blog.

We have added an ebook for extension .epub in our flutter project assets. Now, we will pass this ebook path in our method as an argument & will use this on our android side.

Folio Reader Android In Flutter, Let’s work on Android side Implementation:

Add folio reader SDK in your Android folder.

https://github.com/FolioReader/FolioReader-Android

Let’s work on our MainActivity file.

Add this in your Settings.gradle file.

include ':folioreader'

1	include ':folioreader'

App Level build.gradle file.

plugins {
    id 'com.android.application'
    id 'kotlin-android'
    id 'kotlin-android-extensions'
}

def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
    localPropertiesFile.withReader('UTF-8') { reader ->
        localProperties.load(reader)
    }
}

def flutterRoot = localProperties.getProperty('flutter.sdk')
if (flutterRoot == null) {
    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
    flutterVersionCode = '1'
}

def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
    flutterVersionName = '1.0'
}

apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"

android {
    namespace "com.example.flutter_with_folio_reader"
    compileSdkVersion flutter.compileSdkVersion
    ndkVersion flutter.ndkVersion

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    kotlinOptions {
        jvmTarget = '1.8'
    }

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    defaultConfig {
        applicationId "com.example.flutter_with_folio_reader"
        minSdkVersion flutter.minSdkVersion
        targetSdkVersion flutter.targetSdkVersion
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
    }

    buildTypes {
        release {
            // TODO: Add your own signing config for the release build.
            // Signing with the debug keys for now, so `flutter run --release` works.
            signingConfig signingConfigs.debug
        }
    }
}

flutter {
    source '../..'
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation group: 'commons-io', name: 'commons-io', version: '2.7'
    implementation project(':folioreader')

    implementation "com.fasterxml.jackson.core:jackson-core:2.9.7"
    implementation "com.fasterxml.jackson.core:jackson-annotations:2.9.7"
    implementation "com.fasterxml.jackson.core:jackson-databind:2.9.7"
    implementation "com.fasterxml.jackson.module:jackson-module-kotlin:2.9.7"

    //progressBar error solve
    configurations.matching { it.name == '_internal_aapt2_binary' }.all { config ->
        config.resolutionStrategy.eachDependency { details ->
            details.useVersion("3.3.2-5309881")
        }
    }
    implementation 'androidx.core:core-ktx:1.7.0'

    implementation("com.github.codetoart:r2-shared-kotlin:1.0.4-2") {
        changing = true
    }
}

plugins {

id 'com.android.application'

id 'kotlin-android'

id 'kotlin-android-extensions'

}

def localProperties = new Properties()

def localPropertiesFile = rootProject.file('local.properties')

if (localPropertiesFile.exists()) {

localPropertiesFile.withReader('UTF-8') { reader ->

localProperties.load(reader)

}

def flutterRoot = localProperties.getProperty('flutter.sdk')

if (flutterRoot == null) {

throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")

}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')

if (flutterVersionCode == null) {

flutterVersionCode = '1'

}

def flutterVersionName = localProperties.getProperty('flutter.versionName')

if (flutterVersionName == null) {

flutterVersionName = '1.0'

}

apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"

android {

namespace "com.example.flutter_with_folio_reader"

compileSdkVersion flutter.compileSdkVersion

ndkVersion flutter.ndkVersion

compileOptions {

sourceCompatibility JavaVersion.VERSION_1_8

targetCompatibility JavaVersion.VERSION_1_8

}

kotlinOptions {

jvmTarget = '1.8'

}

sourceSets {

main.java.srcDirs += 'src/main/kotlin'

}

defaultConfig {

applicationId "com.example.flutter_with_folio_reader"

minSdkVersion flutter.minSdkVersion

targetSdkVersion flutter.targetSdkVersion

versionCode flutterVersionCode.toInteger()

versionName flutterVersionName

}

buildTypes {

release {

// TODO: Add your own signing config for the release build.

// Signing with the debug keys for now, so `flutter run --release` works.

signingConfig signingConfigs.debug

}

flutter {

source '../..'

}

dependencies {

implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"

implementation group: 'commons-io', name: 'commons-io', version: '2.7'

implementation project(':folioreader')

implementation "com.fasterxml.jackson.core:jackson-core:2.9.7"

implementation "com.fasterxml.jackson.core:jackson-annotations:2.9.7"

implementation "com.fasterxml.jackson.core:jackson-databind:2.9.7"

implementation "com.fasterxml.jackson.module:jackson-module-kotlin:2.9.7"

//progressBar error solve

configurations.matching { it.name == '_internal_aapt2_binary' }.all { config ->

config.resolutionStrategy.eachDependency { details ->

details.useVersion("3.3.2-5309881")

}

implementation 'androidx.core:core-ktx:1.7.0'

implementation("com.github.codetoart:r2-shared-kotlin:1.0.4-2") {

changing = true

}

Now Works in folio reader level folioreader/build.gradle

plugins {
    id 'com.android.library'
    id 'kotlin-android'
    id 'kotlin-android-extensions'
    id 'kotlin-kapt'
}


android {
    useLibrary 'org.apache.http.legacy'
    compileSdkVersion 33

    defaultConfig {
        minSdkVersion 21
        targetSdkVersion 33
        versionCode 1
        versionName "1.0"
        vectorDrawables.useSupportLibrary = true
    }

    sourceSets {
        main {
            manifest.srcFile 'AndroidManifest.xml'
            java.srcDirs = ['src/main/java']
            res.srcDirs = ['res']
        }
        test {
            java.srcDirs = ['src/test/java']
        }
    }

    packagingOptions {
        exclude 'META-INF/ASL2.0'
        exclude 'META-INF/DEPENDENCIES.txt'
        exclude 'META-INF/LICENSE.txt'
        exclude 'META-INF/NOTICE.txt'
        exclude 'META-INF/NOTICE'
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/DEPENDENCIES'
        exclude 'META-INF/notice.txt'
        exclude 'META-INF/license.txt'
        exclude 'META-INF/dependencies.txt'
        exclude 'META-INF/LGPL2.1'
        exclude 'META-INF/services/javax.annotation.processing.Processor'
    }

    lintOptions {
        abortOnError false
        lintConfig file("lint.xml")
    }

//    checkstyle {
//        ignoreFailures = true
//    }
}


dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')

    implementation "androidx.appcompat:appcompat:1.1.0"
    implementation "androidx.constraintlayout:constraintlayout:1.1.3"
    implementation "androidx.recyclerview:recyclerview:1.1.0"
    implementation 'com.google.android.material:material:1.6.0'
    testImplementation 'junit:junit:4.12'

    implementation 'org.slf4j:slf4j-android:1.7.25'
    implementation 'com.daimajia.swipelayout:library:1.2.0@aar'

    //Kotlin
    implementation "org.jetbrains.kotlin:kotlin-stdlib:1.7.10"

    implementation 'org.greenrobot:eventbus:3.1.1'

    implementation "com.fasterxml.jackson.core:jackson-core:2.9.7"
    implementation "com.fasterxml.jackson.core:jackson-annotations:2.9.7"
    implementation "com.fasterxml.jackson.core:jackson-databind:2.9.7"
    implementation "com.fasterxml.jackson.module:jackson-module-kotlin:2.9.7"
    implementation "com.google.code.gson:gson:2.8.5"

    implementation "com.squareup.retrofit2:retrofit:2.5.0"
    implementation "com.squareup.retrofit2:converter-jackson:2.5.0"
    implementation "com.squareup.retrofit2:converter-gson:2.5.0"

    // R2 modules
    implementation("com.github.codetoart:r2-shared-kotlin:1.0.4-2") {
        changing = true
    }
    implementation("com.github.codetoart:r2-streamer-kotlin:1.0.4-2") {
        exclude group: "org.slf4j", module: "slf4j-api"
        changing = true
    }

    // Only ReflectionUtils in Spring framework is used
    implementation 'org.springframework:spring-core:4.3.19.RELEASE'

    // Lifecycle
    implementation "androidx.lifecycle:lifecycle-extensions:2.2.0"

    kapt 'com.android.databinding:compiler:3.1.4'

    implementation 'com.github.bumptech.glide:glide:4.12.0'

    // Retrofit
    api "com.squareup.retrofit2:retrofit:2.9.0"
    api "com.squareup.retrofit2:adapter-rxjava2:2.9.0"
    api "com.squareup.okhttp3:logging-interceptor:4.9.1"
    api "com.squareup.okhttp3:okhttp-urlconnection:4.9.1"

    // Reactive X android
    api "io.reactivex.rxjava2:rxandroid:2.1.1"
    // Because RxAndroid releases are few and far between, it is recommended you also explicitly depend on RxJava's latest version for bug fixes and new features.
    api "io.reactivex.rxjava2:rxjava:2.2.6"
}

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plugins {

id 'com.android.library'

id 'kotlin-android'

id 'kotlin-android-extensions'

id 'kotlin-kapt'

}

android {

useLibrary 'org.apache.http.legacy'

compileSdkVersion 33

defaultConfig {

minSdkVersion 21

targetSdkVersion 33

versionCode 1

versionName "1.0"

vectorDrawables.useSupportLibrary = true

}

sourceSets {

main {

manifest.srcFile 'AndroidManifest.xml'

java.srcDirs = ['src/main/java']

res.srcDirs = ['res']

}

test {

java.srcDirs = ['src/test/java']

}

packagingOptions {

exclude 'META-INF/ASL2.0'

exclude 'META-INF/DEPENDENCIES.txt'

exclude 'META-INF/LICENSE.txt'

exclude 'META-INF/NOTICE.txt'

exclude 'META-INF/NOTICE'

exclude 'META-INF/LICENSE'

exclude 'META-INF/DEPENDENCIES'

exclude 'META-INF/notice.txt'

exclude 'META-INF/license.txt'

exclude 'META-INF/dependencies.txt'

exclude 'META-INF/LGPL2.1'

exclude 'META-INF/services/javax.annotation.processing.Processor'

}

lintOptions {

abortOnError false

lintConfig file("lint.xml")

}

// checkstyle {

// ignoreFailures = true

// }

}

dependencies {

implementation fileTree(include: ['*.jar'], dir: 'libs')

implementation "androidx.appcompat:appcompat:1.1.0"

implementation "androidx.constraintlayout:constraintlayout:1.1.3"

implementation "androidx.recyclerview:recyclerview:1.1.0"

implementation 'com.google.android.material:material:1.6.0'

testImplementation 'junit:junit:4.12'

implementation 'org.slf4j:slf4j-android:1.7.25'

implementation 'com.daimajia.swipelayout:library:1.2.0@aar'

//Kotlin

implementation "org.jetbrains.kotlin:kotlin-stdlib:1.7.10"

implementation 'org.greenrobot:eventbus:3.1.1'

implementation "com.fasterxml.jackson.core:jackson-core:2.9.7"

implementation "com.fasterxml.jackson.core:jackson-annotations:2.9.7"

implementation "com.fasterxml.jackson.core:jackson-databind:2.9.7"

implementation "com.fasterxml.jackson.module:jackson-module-kotlin:2.9.7"

implementation "com.google.code.gson:gson:2.8.5"

implementation "com.squareup.retrofit2:retrofit:2.5.0"

implementation "com.squareup.retrofit2:converter-jackson:2.5.0"

implementation "com.squareup.retrofit2:converter-gson:2.5.0"

// R2 modules

implementation("com.github.codetoart:r2-shared-kotlin:1.0.4-2") {

changing = true

}

implementation("com.github.codetoart:r2-streamer-kotlin:1.0.4-2") {

exclude group: "org.slf4j", module: "slf4j-api"

changing = true

}

// Only ReflectionUtils in Spring framework is used

implementation 'org.springframework:spring-core:4.3.19.RELEASE'

// Lifecycle

implementation "androidx.lifecycle:lifecycle-extensions:2.2.0"

kapt 'com.android.databinding:compiler:3.1.4'

implementation 'com.github.bumptech.glide:glide:4.12.0'

// Retrofit

api "com.squareup.retrofit2:retrofit:2.9.0"

api "com.squareup.retrofit2:adapter-rxjava2:2.9.0"

api "com.squareup.okhttp3:logging-interceptor:4.9.1"

api "com.squareup.okhttp3:okhttp-urlconnection:4.9.1"

// Reactive X android

api "io.reactivex.rxjava2:rxandroid:2.1.1"

// Because RxAndroid releases are few and far between, it is recommended you also explicitly depend on RxJava's latest version for bug fixes and new features.

api "io.reactivex.rxjava2:rxjava:2.2.6"

}

MainActivity of Flutter project

class MainActivity : FlutterActivity(), OnHighlightListener, ReadLocatorListener,
    FolioReader.OnClosedListener {

    private val LOG_TAG: String = MainActivity::class.java.getSimpleName()
    private var folioReader: FolioReader? = null

    private val CHANNEL = "folio_reader_sdk"
    var methodChannelResult: MethodChannel.Result? = null
    var flutterEngineInstance: FlutterEngine? = null
    lateinit var orderId: String

    @Override
    override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
        super.configureFlutterEngine(flutterEngine)
        folioReader = FolioReader.get()
            .setOnHighlightListener(this)
            .setReadLocatorListener(this)
            .setOnClosedListener(this)
        getHighlightsAndSave()
        flutterEngineInstance = flutterEngine


        MethodChannel(
            flutterEngine.dartExecutor.binaryMessenger,
            CHANNEL
        ).setMethodCallHandler { call, result ->
            try {
                methodChannelResult = result
                if (call.method.equals("openFolioSDK")) {
                    Log.d("TAG", "Arguments: " + call.arguments)
                    if (call.arguments != null) {
                        OpenFolio(call.arguments as String)
                    }
                } else {
                    result.notImplemented()
                }
            } catch (e: Exception) {
                Log.d("TAG", e.toString())
            }
        }
    }


    fun OpenFolio(url: String) {
        val readLocator = getLastReadLocator()

        var config = getSavedConfig(applicationContext)
        if (config == null) config = Config()
        config.allowedDirection = Config.AllowedDirection.VERTICAL_AND_HORIZONTAL

        folioReader?.setReadLocator(readLocator)?.setConfig(config, true)?.openBook(url, "true")
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
    }

    private fun getLastReadLocator(): ReadLocator? {
        val jsonString = loadAssetTextAsString("Locators/LastReadLocators/last_read_locator_1.json")
        return fromJson(jsonString)
    }

    override fun saveReadLocator(readLocator: ReadLocator) {
        Log.i(
            LOG_TAG,
            "-> saveReadLocator -> " + readLocator.toJson()
        )
    }

    /*
     * For testing purpose, we are getting dummy highlights from asset. But you can get highlights from your server
     * On success, you can save highlights to FolioReader DB.
     */
    private fun getHighlightsAndSave() {
        Thread {
            var highlightList: ArrayList<HighLight?>? = null
            val objectMapper = ObjectMapper()
            try {
                highlightList = objectMapper.readValue(
                    loadAssetTextAsString("highlights/highlights_data.json"),
                    object :
                        TypeReference<List<HighLight?>?>() {})
            } catch (e: IOException) {
                e.printStackTrace()
            }
            if (highlightList == null) {
                folioReader?.saveReceivedHighLights(highlightList, OnSaveHighlight {
                    //You can do anything on successful saving highlight list
                })
            }
        }.start()
    }

    private fun loadAssetTextAsString(name: String): String? {
        var `in`: BufferedReader? = null
        try {
            val buf = StringBuilder()
            val `is` = assets.open(name)
            `in` = BufferedReader(InputStreamReader(`is`))
            var str: String?
            var isFirst = true
            while (`in`.readLine().also { str = it } != null) {
                if (isFirst) isFirst = false else buf.append('\n')
                buf.append(str)
            }
            return buf.toString()
        } catch (e: IOException) {
            Log.e("HomeActivity", "Error opening asset $name")
        } finally {
            if (`in` != null) {
                try {
                    `in`.close()
                } catch (e: IOException) {
                    Log.e("HomeActivity", "Error closing asset $name")
                }
            }
        }
        return null
    }

    override fun onDestroy() {
        super.onDestroy()
        FolioReader.clear()
    }

    override fun onHighlight(highlight: HighLight, type: HighLightAction) {

    }

    override fun onFolioReaderClosed() {
        TODO("Not yet implemented")
    }


}

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class MainActivity : FlutterActivity(), OnHighlightListener, ReadLocatorListener,

FolioReader.OnClosedListener {

private val LOG_TAG: String = MainActivity::class.java.getSimpleName()

private var folioReader: FolioReader? = null

private val CHANNEL = "folio_reader_sdk"

var methodChannelResult: MethodChannel.Result? = null

var flutterEngineInstance: FlutterEngine? = null

lateinit var orderId: String

@Override

override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {

super.configureFlutterEngine(flutterEngine)

folioReader = FolioReader.get()

.setOnHighlightListener(this)

.setReadLocatorListener(this)

.setOnClosedListener(this)

getHighlightsAndSave()

flutterEngineInstance = flutterEngine

MethodChannel(

flutterEngine.dartExecutor.binaryMessenger,

CHANNEL

).setMethodCallHandler { call, result ->

try {

methodChannelResult = result

if (call.method.equals("openFolioSDK")) {

Log.d("TAG", "Arguments: " + call.arguments)

if (call.arguments != null) {

OpenFolio(call.arguments as String)

}

} else {

result.notImplemented()

}

} catch (e: Exception) {

Log.d("TAG", e.toString())

}

fun OpenFolio(url: String) {

val readLocator = getLastReadLocator()

var config = getSavedConfig(applicationContext)

if (config == null) config = Config()

config.allowedDirection = Config.AllowedDirection.VERTICAL_AND_HORIZONTAL

folioReader?.setReadLocator(readLocator)?.setConfig(config, true)?.openBook(url, "true")

}

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {

super.onActivityResult(requestCode, resultCode, data)

}

private fun getLastReadLocator(): ReadLocator? {

val jsonString = loadAssetTextAsString("Locators/LastReadLocators/last_read_locator_1.json")

return fromJson(jsonString)

}

override fun saveReadLocator(readLocator: ReadLocator) {

Log.i(

LOG_TAG,

"-> saveReadLocator -> " + readLocator.toJson()

)

}

* For testing purpose, we are getting dummy highlights from asset. But you can get highlights from your server

* On success, you can save highlights to FolioReader DB.

private fun getHighlightsAndSave() {

Thread {

var highlightList: ArrayList<HighLight?>? = null

val objectMapper = ObjectMapper()

try {

highlightList = objectMapper.readValue(

loadAssetTextAsString("highlights/highlights_data.json"),

object :

TypeReference<List<HighLight?>?>() {})

} catch (e: IOException) {

e.printStackTrace()

}

if (highlightList == null) {

folioReader?.saveReceivedHighLights(highlightList, OnSaveHighlight {

//You can do anything on successful saving highlight list

})

}

}.start()

}

private fun loadAssetTextAsString(name: String): String? {

var `in`: BufferedReader? = null

try {

val buf = StringBuilder()

val `is` = assets.open(name)

`in` = BufferedReader(InputStreamReader(`is`))

var str: String?

var isFirst = true

while (`in`.readLine().also { str = it } != null) {

if (isFirst) isFirst = false else buf.append('\n')

buf.append(str)

}

return buf.toString()

} catch (e: IOException) {

Log.e("HomeActivity", "Error opening asset $name")

} finally {

if (`in` != null) {

try {

`in`.close()

} catch (e: IOException) {

Log.e("HomeActivity", "Error closing asset $name")

}

return null

}

override fun onDestroy() {

super.onDestroy()

FolioReader.clear()

}

override fun onHighlight(highlight: HighLight, type: HighLightAction) {

}

override fun onFolioReaderClosed() {

TODO("Not yet implemented")

}

We have fetched the path of the asset in android & used it to open our book using the Folio Reader Android In Flutter using android webview.

That’s all for this Article 🎊 .

Conclusion

We’ve Integrated Folio Reader Android In Flutter In this blog, we’ve learned how to call native SDK In Flutter.

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