Flutter 打开/关闭 闪光灯

1. 功能

打开/关闭手电筒、获取电池电量、获取手机系统。

2. 使用

该插件为本人撰写，点击pub.dev查看。

dependencies:
  control_center: ^0.0.4

 import 'package:control_center/control_center.dart';

 final _controlCenterPlugin = ControlCenter();
 //打开/关闭手电筒
 bool switchBool =  await _controlCenterPlugin.openOrCloseFlashlight();

 //获取手机电池电量
 int batteryLevel = await _controlCenterPlugin.getBatteryLevel()
 //获取手机系统版本
 String platformVersion = await _controlCenterPlugin.getPlatformVersion();

3. 代码

* iOS

public class SwiftControlCenterPlugin: NSObject, FlutterPlugin {
 public static func register(with registrar: FlutterPluginRegistrar) {
   let channel = FlutterMethodChannel(name: "control_center", binaryMessenger: registrar.messenger())
   let instance = SwiftControlCenterPlugin()
   registrar.addMethodCallDelegate(instance, channel: channel)
 }

 public func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
   if  call.method == "getPlatformVersion" {

       result("iOS " + UIDevice.current.systemVersion)

   } else if call.method == "getBatteryLevel" {

            let device = UIDevice.current
            device.isBatteryMonitoringEnabled = true
            if device.batteryState == UIDevice.BatteryState.unknown {
              result(FlutterError(code: "UNAVAILABLE",message: "Battery info unavailable",details: nil))
            } else {

              result(Int(device.batteryLevel * 100))//电池电量

            }


   }else if call.method == "openOrCloseFlashlight" {

         // 创建Device实例对象
            let device = AVCaptureDevice.default(for: AVMediaType.video)
          if device!.hasTorch && ((device?.isTorchAvailable) != nil){
           // 加锁
           try? device?.lockForConfiguration()
           if device?.torchMode == .off{
               // 开灯
               device?.torchMode = .on
               
               result(true)
           }else{
               // 关灯
               device!.torchMode = .off
               
               result(false)
           }
           // 解锁
           device!.unlockForConfiguration()
       }
   }
  result(FlutterMethodNotImplemented)
 }
}

* Android

private lateinit var channel : MethodChannel
 private lateinit var myContext: Context
 private lateinit var manager: CameraManager
 private lateinit var mCamera: Camera
 private var isFlashOn = false //记录手电筒状态

 override fun onAttachedToEngine(@NonNull flutterPluginBinding: FlutterPlugin.FlutterPluginBinding) {
   channel = MethodChannel(flutterPluginBinding.binaryMessenger, "control_center")
   channel.setMethodCallHandler(this)

   myContext=flutterPluginBinding.applicationContext

   if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
       manager = myContext.getSystemService(Context.CAMERA_SERVICE) as CameraManager
   }

 }

 override fun onMethodCall(@NonNull call: MethodCall, @NonNull result: Result) {
   if (call.method == "getPlatformVersion") {

     result.success("Android ${android.os.Build.VERSION.RELEASE}")

   }else  if (call.method == "getBatteryLevel") {

     val batteryLevel = getBatteryLevel()
     result.success(batteryLevel)

   }else  if (call.method == "openOrCloseFlashlight") {

     val  lightStatus = openOrCloseFlashlight()
     result.success(lightStatus)

   }else {
     result.notImplemented()
   }
 }

 override fun onDetachedFromEngine(@NonNull binding: FlutterPlugin.FlutterPluginBinding) {
   channel.setMethodCallHandler(null)
 }

 //获取电池电量
 private fun getBatteryLevel(): Int {
   val batteryLevel: Int
   if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {

     val batteryManager = myContext.getSystemService(Context.BATTERY_SERVICE) as BatteryManager
     batteryLevel = batteryManager.getIntProperty(BatteryManager.BATTERY_PROPERTY_CAPACITY)

   } else {
     val intent = ContextWrapper(myContext).registerReceiver(null, IntentFilter(Intent.ACTION_BATTERY_CHANGED))
     batteryLevel = intent!!.getIntExtra(BatteryManager.EXTRA_LEVEL, -1) * 100 / intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1)
   }

   return batteryLevel
 }

 //打开闪光灯
 private fun openOrCloseFlashlight(): Boolean {

   if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {

     manager.setTorchMode("0", !isFlashOn)
     isFlashOn=!isFlashOn

   }else{
     var camera = Camera.open()
     var parameters = camera.parameters
     if (isFlashOn) {
       parameters.flashMode = Camera.Parameters.FLASH_MODE_OFF
     } else {
       parameters.flashMode = Camera.Parameters.FLASH_MODE_TORCH
     }
     camera.parameters = parameters
     isFlashOn = !isFlashOn

   }

   return  isFlashOn
 }

4. Demo

Github: control_center