قم بتحديث Android SDk كما  في الصور

1- Android Platforms

 Android 15 فما فوق و ينصح باخر اصدار 16

SDK Tools

Android SDK Build-Tools 36.1.0

NDK 29.0.14033849

Android SDK Command-line Tools 19.0

تحديث فلاتر الى اخر اصدار Flutter 3.35.4

التعديلات المطلوب اجراءها في المشروع

تم قم بتحديث الاسطر المظللة باللون الأزرق في الملفات التالية من مجلد المشروع

\android\app\build.gradle

compileSdk 36
ndkVersion ‘29.0.14033849’
buildToolsVersion ‘36.0.0’

sourceCompatibility JavaVersion.VERSION_21
targetCompatibility JavaVersion.VERSION_21

jvmTarget = “21”

targetSdk 36

import java.util.Properties
import java.io.FileInputStream

plugins {
    id 'com.android.application'
    id 'org.jetbrains.kotlin.android'
    id 'dev.flutter.flutter-gradle-plugin'
}

def keystoreProperties = new Properties()
def keystorePropertiesFile = rootProject.file('key.properties')
if (keystorePropertiesFile.exists()) {
    keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
}

android {
    namespace 'com.exemple'
    compileSdk 36
    ndkVersion '29.0.14033849'
    buildToolsVersion '36.0.0'

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_21
        targetCompatibility JavaVersion.VERSION_21
    }

    kotlinOptions {
        jvmTarget = "21"
    }

    packagingOptions {
        jniLibs {
            useLegacyPackaging false
        }
    }

    defaultConfig {
        applicationId 'com.exemple'
        minSdk flutter.minSdkVersion
        targetSdk 36
        versionCode flutter.versionCode
        versionName flutter.versionName
    }

    signingConfigs {
        release {
            if (keystoreProperties['keyAlias']) {
                keyAlias keystoreProperties['keyAlias']
                keyPassword keystoreProperties['keyPassword']
                storeFile file(keystoreProperties['storeFile'])
                storePassword keystoreProperties['storePassword']
            }
        }
    }

    buildTypes {
        release {
            // Uncomment the next line when you have keystore configured
            signingConfig signingConfigs.release
            
            // Using debug signing for now
            // signingConfig signingConfigs.debug
        }
    }
}

flutter {
    source '../..'
}

android\gradle\wrapper\gradle-wrapper.properties

distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-all.zip

distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-all.zip

android\build.gradle

ext.kotlin_version = ‘2.1.0’

classpath “com.android.tools.build:gradle:8.12.0”

buildscript {
    ext.kotlin_version = '2.1.0'
    repositories {
        google()
        mavenCentral()
    }
    dependencies {
        classpath "com.android.tools.build:gradle:8.12.0"
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}
allprojects {
    repositories {
        google()
        mavenCentral()
    }
}
rootProject.buildDir = '../build'
subprojects {
    project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
    project.evaluationDependsOn(':app')
}
tasks.register("clean", Delete) {
    delete rootProject.buildDir
}

تم قم بتنظيف المشروع

Flutter clean
Flutter pub get

تم قم ببناء التطبيق

flutter build appbundle --release

او

flutter build apk --release

و لا تنسى تغيير رقم الإصدار للتطبيق من ملف pubspec.yaml