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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Thermal printer  android issue","articleBody":"I'm using Flutter 3.29.3 and JDK 23 to build an Android POS application. I'm trying to connect to a Bluetooth device, but the connection fails. The error message indicates that permissions are granted, and I have already added the necessary permissions in the AndroidManifest.xml file. Why is the Bluetooth device not connecting?\n\n    \u003cuses-permission android:name=\"android.permission.BLUETOOTH_CONNECT\" /\u003e\n    \u003cuses-permission android:name=\"android.permission.INTERNET\"/\u003e\n    \u003cuses-permission android:name=\"android.permission.BLUETOOTH_ADVERTISE\" /\u003e\n    \u003cuses-permission android:name=\"android.permission.BLUETOOTH\"/\u003e\n    \u003cuses-permission android:name=\"android.permission.BLUETOOTH_ADMIN\"/\u003e\n    \u003cuses-permission android:name=\"android.permission.BLUETOOTH_SCAN\"/\u003e\n    \u003cuses-permission android:name=\"android.permission.BLUETOOTH_CONNECT\"/\u003e\n    \u003cuses-permission android:name=\"android.permission.ACCESS_FINE_LOCATION\"/\u003e\n\n android/build.gradle\n\nplugins {\n    id \"com.android.application\"\n    id \"kotlin-android\"\n    // The Flutter Gradle Plugin must be applied after the Android and Kotlin Gradle plugins.\n    id \"dev.flutter.flutter-gradle-plugin\"\n}\n\ndef localProperties = new Properties()\ndef localPropertiesFile = rootProject.file(\"local.properties\")\nif (localPropertiesFile.exists()) {\n    localPropertiesFile.withReader(\"UTF-8\") { reader -\u003e\n        localProperties.load(reader)\n    }\n}\n\ndef flutterVersionCode = localProperties.getProperty(\"flutter.versionCode\")\nif (flutterVersionCode == null) {\n    flutterVersionCode = \"1\"\n}\n\ndef flutterVersionName = localProperties.getProperty(\"flutter.versionName\")\nif (flutterVersionName == null) {\n    flutterVersionName = \"1.0\"\n}\n\nandroid {\n    namespace = \"com.example.equal_pos_app\"\n    compileSdk = 35\n    ndkVersion = \"25.1.8937393\"\n buildFeatures {\n        buildConfig = true\n    }\n    compileOptions {\n        sourceCompatibility = JavaVersion.VERSION_1_8\n        targetCompatibility = JavaVersion.VERSION_1_8\n    }\n  kotlinOptions {\n        jvmTarget = JavaVersion.VERSION_1_8\n    }\n    defaultConfig {\n        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).\n        applicationId = \"com.example.equal_pos_app\"\n        // You can update the following values to match your application needs.\n        // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.\n        minSdk = 22\n        // targetSdk = 34\n        multiDexEnabled true\n        versionCode = flutterVersionCode.toInteger()\n        versionName = flutterVersionName\n        // minifyEnabled true\n        //shrinkResources true\n        targetSdk = 34\n    \n    }\n\n    buildTypes {\n        release {\n            // TODO: Add your own signing config for the release build.\n            // Signing with the debug keys for now, so `flutter run --release` works.\n            signingConfig = signingConfigs.debug\n            minifyEnabled true\n\n            // Enables resource shrinking, which is performed by the\n            // Android Gradle plugin.\n            shrinkResources true\n        }\n    }\n}\n\nflutter {\n    source = \"../..\"\n}\n\ndependencies {\n    implementation 'androidx.core:core:1.15.0'\n    implementation 'androidx.activity:activity-ktx:1.9.3'\n    implementation 'com.google.android.gms:play-services-instantapps:18.1.0'\n    implementation \"androidx.activity:activity:1.9.3\"\n}\n","author":{"url":"https://github.com/Sreeshks","@type":"Person","name":"Sreeshks"},"datePublished":"2025-04-26T08:20:05.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/36/thermal_printer/issues/36"}