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android {
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    defaultConfig {
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        multiDexEnabled = true
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    }
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    compileOptions {
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        // Flag to enable support for the new language APIs
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        // 1、启用Desugaring
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        isCoreLibraryDesugaringEnabled = true
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        // Sets Java compatibility to Java 11
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        sourceCompatibility = JavaVersion.VERSION_11
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        targetCompatibility = JavaVersion.VERSION_11
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    }
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    kotlinOptions {
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        jvmTarget = JavaVersion.VERSION_11.toString()
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    }
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}
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// 2、启用coreLibrary
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dependencies {
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    coreLibraryDesugaring("com.android.tools:desugar_jdk_libs:2.1.4")
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}

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<receiver android:exported="false" android:name="com.dexterous.flutterlocalnotifications.ScheduledNotificationReceiver" />
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<receiver android:exported="false" android:name="com.dexterous.flutterlocalnotifications.ScheduledNotificationBootReceiver">
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    <intent-filter>
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        <action android:name="android.intent.action.BOOT_COMPLETED"/>
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        <action android:name="android.intent.action.MY_PACKAGE_REPLACED"/>
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        <action android:name="android.intent.action.QUICKBOOT_POWERON" />
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        <action android:name="com.htc.intent.action.QUICKBOOT_POWERON"/>
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    </intent-filter>
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</receiver>

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FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
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        FlutterLocalNotificationsPlugin();
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flutterLocalNotificationsPlugin.resolvePlatformSpecificImplementation<
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    AndroidFlutterLocalNotificationsPlugin>().requestNotificationsPermission();