lambda expressions are not supported in -source 7

Hi. When running app using command: npx react-native run-android or building with Android Studio, it always returns this error: node_modules/react-native-ble-manager/android/src/main/java/it/innove/BleManager.java:747: error: lambda expressions are not supported in -source 7 scanManager.stopScan(args -> {}); ^ (use -source 8 or higher to enable lambda expressions) To Reproduce Steps to reproduce the behavior:

1. After install all packages
2. Start app by command: npx react-native run-android
3. See error

Expected behavior It must build the app successfully.

Screenshots Having the same error when building by Android Studio:

Smartphone (please complete the following information):

• Device: Samsung A52s 5G
• OS: Android 12
• react-native-ble-manager version: 8.3.0
• react-native version: 0.66.0

android/build.gradle:

buildscript {
    ext {
        buildToolsVersion = "30.0.2"
        minSdkVersion = 23
        compileSdkVersion = 31
        targetSdkVersion = 31
    }
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath('com.android.tools.build:gradle:3.6.0')
    }
}

Full error log

> Task :react-native-ble-manager:generateDebugBuildConfig UP-TO-DATE
> Task :react-native-ble-manager:compileDebugRenderscript NO-SOURCE
> Task :react-native-ble-manager:generateDebugResValues UP-TO-DATE
> Task :react-native-ble-manager:generateDebugResources UP-TO-DATE
> Task :react-native-ble-manager:packageDebugResources UP-TO-DATE
> Task :react-native-ble-manager:parseDebugLocalResources UP-TO-DATE
> Task :react-native-ble-manager:processDebugManifest UP-TO-DATE
> Task :react-native-ble-manager:generateDebugRFile UP-TO-DATE
> Task :react-native-ble-manager:javaPreCompileDebug UP-TO-DATE

> Task :react-native-ble-manager:compileDebugJavaWithJavac FAILED
10 actionable tasks: 2 executed, 8 up-to-date
Warning: Mapping new ns http://schemas.android.com/repository/android/common/02 to old ns http://schemas.android.com/repository/android/common/01
Warning: Mapping new ns http://schemas.android.com/repository/android/generic/02 to old ns http://schemas.android.com/repository/android/generic/01
Warning: Mapping new ns http://schemas.android.com/sdk/android/repo/addon2/02 to old ns http://schemas.android.com/sdk/android/repo/addon2/01
Warning: Mapping new ns http://schemas.android.com/sdk/android/repo/repository2/02 to old ns http://schemas.android.com/sdk/android/repo/repository2/01
Warning: Mapping new ns http://schemas.android.com/sdk/android/repo/sys-img2/02 to old ns http://schemas.android.com/sdk/android/repo/sys-img2/01
Warning: Mapping new ns http://schemas.android.com/repository/android/common/02 to old ns http://schemas.android.com/repository/android/common/01
Warning: Mapping new ns http://schemas.android.com/repository/android/generic/02 to old ns http://schemas.android.com/repository/android/generic/01
Warning: Mapping new ns http://schemas.android.com/sdk/android/repo/addon2/02 to old ns http://schemas.android.com/sdk/android/repo/addon2/01
Warning: Mapping new ns http://schemas.android.com/sdk/android/repo/repository2/02 to old ns http://schemas.android.com/sdk/android/repo/repository2/01
Warning: Mapping new ns http://schemas.android.com/sdk/android/repo/sys-img2/02 to old ns http://schemas.android.com/sdk/android/repo/sys-img2/01
/Users/canhqn/Documents/cartek/node_modules/react-native-ble-manager/android/src/main/java/it/innove/BleManager.java:747: error: lambda expressions are not supported in -source 7
            scanManager.stopScan(args -> {});
                                      ^
  (use -source 8 or higher to enable lambda expressions)
1 error

FAILURE: Build failed with an exception.

[phamhien2102]

I also faced this issue (release 8.4.0). My solution: Firstly, add lines into node_modules/react-native-ble-manager/android/build.gradle (link)

        // Add these lines
	compileOptions {
		sourceCompatibility JavaVersion.VERSION_1_8
		targetCompatibility JavaVersion.VERSION_1_8
	}

	defaultConfig {
		minSdkVersion safeExtGet("minSdkVersion", 21)
	}

Finally, I used patch-package to patch this library, please run this command in terminal:

yarn patch-package react-native-ble-manager

So, hope this help everybody

[MuriloBarranco]

+1