4.Flutter混合开发-打开蓝牙(1)

因为最近上班在公司在做一些BLE方面的东西，在Futter中目前一般使用的是flutterblue，但是在使用的过程中，发现这个工具包不是特别好用，功能方面也有一些不完善，于是就想着自己通过原生去实现。我们先上源代码。

import 'package:flutter/services.dart';

class BlueToothHelper{
  static const MethodChannel methodChannel= MethodChannel('com.flutter.io/bluetooth');
  Function method;
  Future<String> openBlueTooth() async{     //打开蓝牙
    dynamic future=await methodChannel.invokeMethod('openBuleTooth');
    return future;
  }
}

package com.tdft.plugin;

import android.Manifest;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothManager;
import android.content.Context;
import android.content.pm.PackageManager;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.widget.Toast;

import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import io.flutter.plugin.common.MethodCall;
import io.flutter.plugin.common.MethodChannel;
import io.flutter.plugin.common.PluginRegistry;

public class BluetoothPlugin implements MethodChannel.MethodCallHandler, PluginRegistry.RequestPermissionsResultListener {
    public static String CHANNEL = "com.flutter.io/bluetooth";

    private BluetoothAdapter mBluetoothAdapter;
    private boolean mScanning = false;
    private final int SCAN_PERIOD = 10000;
    private static final int REQUEST_COARSE_LOCATION_PERMISSIONS = 1452;
    static MethodChannel channel;
    private MethodCall pendingCall;
    private MethodChannel.Result pendingResult;


    private Handler mHandler = new Handler(){
        @Override
        public void dispatchMessage(Message msg) {
            super.dispatchMessage(msg);
            switch (msg.what){
                case 200:
                    Log.w("leafly","onLeScan");
                    break;
            }
        }
    };

    private Activity activity;
    private Context context;
    private BluetoothPlugin(Activity activity) {
        this.activity = activity;
        this.context = activity.getBaseContext();
    }


    public static void registerWith(PluginRegistry.Registrar registrar) {
        channel = new MethodChannel(registrar.messenger(), CHANNEL);
        BluetoothPlugin instance = new BluetoothPlugin(registrar.activity());
        //setMethodCallHandler在此通道上接收方法调用的回调
        channel.setMethodCallHandler(instance);

    }

    @Override
    public void onMethodCall(MethodCall call, MethodChannel.Result result) {
        //通过MethodCall可以获取参数和方法名，然后再寻找对应的平台业务
        if (call.method.equals("openBuleTooth")) {
            if (!activity.getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {
                Toast.makeText(context, "该设备不支持蓝牙", Toast.LENGTH_SHORT).show();
                result.success("false");
                return;
            }

            final BluetoothManager bluetoothManager = (BluetoothManager) context.getSystemService(context.BLUETOOTH_SERVICE);
            mBluetoothAdapter = bluetoothManager.getAdapter();
            BluetoothManager mBluetoothManager = (BluetoothManager) context.getSystemService(Context.BLUETOOTH_SERVICE);
            if (mBluetoothManager != null) {
                mBluetoothAdapter = mBluetoothManager.getAdapter();
                if (mBluetoothAdapter != null) {
                    if (!mBluetoothAdapter.isEnabled()) {
                        mBluetoothAdapter.enable();  //打开蓝牙
                    }
                }
            }
            result.success("success");
        }else {
            result.notImplemented();
        }
    }

}

private static void registerCustomPlugin(PluginRegistry registrar){
    BluetoothPlugin.registerWith(registrar.registrarFor(BluetoothPlugin.CHANNEL));
  }