androidBLE蓝牙

参考资料：

Android BLE 蓝牙开发入门 - 简书     //  部分方法过时

android蓝牙BLE（一） —— 扫描 - 简书   //分四部讲解  比较详细  推荐

demo1下载链接：service后台读取数据通知广播更新界面

图：

 

 demo2下载链接：BlueTooth_Test.zip-Android文档类资源-CSDN下载

添加权限

蓝牙扫描需要开启位置权限：

targetSdkVersion 28以前需要动态申请开启模糊定位，targetSdkVersion 大于28需要开启精准定位，否则扫描不到蓝牙设备。

main_layout:

MainActivity:

package youli.com.example.administrator.bluetooth_servise_bread;

import android.Manifest;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothManager;
import android.bluetooth.le.BluetoothLeScanner;
import android.bluetooth.le.ScanCallback;
import android.bluetooth.le.ScanResult;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.ServiceConnection;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Looper;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private TextView text_data;
    private TextView text_rssi;

    private final int REQUEST_ENABLE_BT = 1;
    private BleService bleService;
    private BluetoothAdapter bluetoothAdapter;
    private BluetoothLeScanner bluetoothLeScanner;
    private BluetoothManager bluetoothManager; //蓝牙管理类

    private List mBluetoothDeviceList;
    private List mRssiList;
    private RecyclerView mRvDeviceList;
    private Button mBtnScan;
    private DeviceListAdapter mDeviceListAdapter;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        getLOCATION();
        initView();
        initBle();
    }


    private void initView() {
        text_data = findViewById(R.id.text_data);
        text_rssi = findViewById(R.id.text_rssi);

        mRvDeviceList = (RecyclerView) findViewById(R.id.rv_device_list);
        mBtnScan = (Button) findViewById(R.id.btn_scan);
        mBtnScan.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                scanBleDevice();
            }
        });

        // 蓝牙设备列表
        mBluetoothDeviceList = new ArrayList<>();
        // 蓝牙设备RSSI列表
        mRssiList = new ArrayList<>();
        mDeviceListAdapter = new DeviceListAdapter(mBluetoothDeviceList, mRssiList);
        mRvDeviceList.setLayoutManager(new LinearLayoutManager(this));
        mRvDeviceList.setAdapter(mDeviceListAdapter);

        // 连接蓝牙设备
        mDeviceListAdapter.setOnItemClickListener(new DeviceListAdapter.OnItemClickListener() {
            @Override
            public void onItemClick(View view, int position) {
                Toast.makeText(MainActivity.this, "开始连接", Toast.LENGTH_SHORT).show();
                bluetoothLeScanner.stopScan(scanCallback);

                bleService.connect(bluetoothAdapter, mBluetoothDeviceList.get(position).getAddress());
            }
        });

        // 绑定服务
        Intent intent = new Intent(MainActivity.this, BleService.class);
        bindService(intent, serviceConnection, Context.BIND_AUTO_CREATE);


        //注册广播
        IntentFilter filter = new IntentFilter();
        filter.addAction(BleService.ACTION_GATT_CONNECTED);
        filter.addAction(BleService.ACTION_GATT_DISCONNECTED);
        filter.addAction(BleService.ACTION_GATT_SERVICES_DISCOVERED);
        filter.addAction(BleService.ACTION_DATA_AVAILABLE);
        filter.addAction(BleService.ACTION_CONNECTING_FAIL);
        filter.addAction(BleService.EXTRA_RSSI_DATA);
        BleReceiver bleReceiver = new BleReceiver();
        registerReceiver(bleReceiver, filter);

    }

    /**
     * 初始化数据
     */
    private void initBle() {
        bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
//        bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
//        bluetoothAdapter = bluetoothManager.getAdapter();
        if (bluetoothAdapter == null) {
            Toast.makeText(this, "蓝牙不可用", Toast.LENGTH_LONG).show();
            return;
        }
        if (!bluetoothAdapter.isEnabled()) {
            Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(intent, REQUEST_ENABLE_BT);
            return;
        }
        scanBleDevice();
    }

    /**
     * 搜索蓝牙设备
     */
    private void scanBleDevice() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {

            bluetoothLeScanner = bluetoothAdapter.getBluetoothLeScanner();
            bluetoothLeScanner.stopScan(scanCallback);
            bluetoothLeScanner.startScan(scanCallback);

            new Handler(Looper.getMainLooper()).postDelayed(new Runnable() {
                @Override
                public void run() {
                    bluetoothLeScanner.stopScan(scanCallback);
                }
            }, 10000);
        }
    }

    /**
     * 搜索蓝牙设备回调
     */
    ScanCallback scanCallback = new ScanCallback() {
        @Override//扫描结果
        public void onScanResult(int callbackType, ScanResult result) {
            super.onScanResult(callbackType, result);

            BluetoothDevice bluetoothDevice = result.getDevice();
            int rssi = result.getRssi();

            if (!TextUtils.isEmpty(bluetoothDevice.getName())) {
                if (!mBluetoothDeviceList.contains(bluetoothDevice)) {
                    mBluetoothDeviceList.add(bluetoothDevice);
                    mRssiList.add(String.valueOf(rssi));
                    mDeviceListAdapter.notifyDataSetChanged();
                }
            }
        }

        @Override//批量返回扫描结果
        public void onBatchScanResults(List results) {
            super.onBatchScanResults(results);
        }

        @Override //扫描失败
        public void onScanFailed(int errorCode) {
            super.onScanFailed(errorCode);
        }
    };


    ServiceConnection serviceConnection = new ServiceConnection() {

        @Override //在线服务连接
        public void onServiceConnected(ComponentName name, IBinder service) {
//            BleService.LocalBinder localBinder= (BleService.LocalBinder) service;
            bleService = ((BleService.LocalBinder) service).getService();

        }

        @Override//OnService断开连接
        public void onServiceDisconnected(ComponentName name) {
            bleService = null;
        }
    };


    private List