BlueTooth，Android 蓝牙设备扫描，链接，通信

package com.example.bluetooth; import androidx.annotation.RequiresApi; import androidx.appcompat.app.AppCompatActivity; import androidx.core.app.ActivityCompat; import androidx.core.content.ContextCompat; import android.Manifest; import android.annotation.SuppressLint; import android.bluetooth.BluetoothAdapter; import android.bluetooth.BluetoothDevice; import android.bluetooth.BluetoothManager; import android.bluetooth.BluetoothSocket; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.pm.PackageManager; import android.location.LocationManager; import android.os.Build; import android.os.Bundle; import android.os.ParcelUuid; import android.text.TextUtils; import android.util.Log; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.ListAdapter; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.HashSet; import java.util.Set; import java.util.UUID; /** * android 连接 蓝牙 （配置） */ public class MainActivity extends AppCompatActivity { private static final int REQUEST_ENABLE_BT = 1; // 拿到 BluetoothAdapter private BluetoothAdapter bluetoothAdapter; private ArrayAdapter<String> deviceListAdapter; private ListView deviceListView; private BluetoothDevice selectedDevice; private BluetoothSocket bluetoothSocket; @RequiresApi(api = Build.VERSION_CODES.M) @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); init(); createBluetoothBond(); registerBroadcast(); } // 初始化 private void init() { // 获取蓝牙配置器 BluetoothAdapter 方式1. BluetoothManager bluetoothManger = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE); bluetoothAdapter = bluetoothManger.getAdapter(); //方式2 // bluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); } // 蓝牙配对 @RequiresApi(api = Build.VERSION_CODES.M) @SuppressLint("MissingPermission") private void createBluetoothBond() { if (bluetoothAdapter == null) { Toast.makeText(this, "没有蓝牙功能", Toast.LENGTH_SHORT).show(); return; } if (!bluetoothAdapter.isEnabled()) { // 没有开启蓝牙 开启蓝牙 Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE); startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT); } //判断是否有访问位置的权限，没有权限，直接申请位置权限 if ((checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) || (checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED)) { requestPermissions(new String[]{Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.ACCESS_FINE_LOCATION}, 200); } // 创建设备列表适配器 deviceListAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1); deviceListView = (ListView) findViewById(R.id.device_list); deviceListView.setAdapter(deviceListAdapter); deviceListView.setOnItemClickListener((adapterView, view, i, l) -> { //当点击某个蓝牙列表时，需要停止扫描，减少性能的消耗 if (bluetoothAdapter.isDiscovering()) { bluetoothAdapter.cancelDiscovery(); } String deviceName = deviceListAdapter.getItem(i); Log.e("nyz", "deviceName " + deviceName); selectedDevice = bluetoothAdapter.getRemoteDevice(deviceName.split("\\n")[1]); Log.e("nyz", "name " + selectedDevice.getName()); Log.e("nyz", "address " + selectedDevice.getAddress()); ParcelUuid[] uuids = selectedDevice.getUuids(); for (int index = 0; index < uuids.length; index++) { Log.e("nyz", "uuids " + uuids[index]); } //开始链接 connectToDevice(selectedDevice); }); // 搜索设备按钮点击事件 Button searchButton = (Button) findViewById(R.id.search_button); searchButton.setOnClickListener(view -> { startDeviceDiscovery(); }); findViewById(R.id.search_button1).setOnClickListener(v -> { Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE); discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300); startActivity(discoverableIntent); }); } @RequiresApi(api = Build.VERSION_CODES.M) @SuppressLint("MissingPermission") private void startDeviceDiscovery() { deviceListAdapter.clear(); int state = bluetoothAdapter.getState(); Log.e("nyz", "state " + state); boolean b = bluetoothAdapter.startDiscovery(); Log.e("nyz", "bluetooth state " + b); //获取已经连接过的设备。 Set<BluetoothDevice> bondedDevices = bluetoothAdapter.getBondedDevices(); for (BluetoothDevice device : bondedDevices) { Log.e("nyz", "device " + device.getName()); deviceListAdapter.add(device.getName() + "\n" + device.getAddress()); deviceListAdapter.notifyDataSetChanged(); } } @SuppressLint("MissingPermission") private void connectToDevice(BluetoothDevice device) { new Thread() { @Override public void run() { super.run(); UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); // SPP UUID for serial communication try { // 进行配对 if (!(device.getBondState() == BluetoothDevice.BOND_BONDED)) { Log.e("nyz", "等待配对"); boolean success = device.createBond(); Log.e("nyz", "配对结果 " + success); } else { Log.e("nyz", "已经配对过"); } // 等待配对完成 // Thread.sleep(500); Log.e("nyz", "创建 socket"); bluetoothSocket = device.createRfcommSocketToServiceRecord(uuid); Log.e("nyz", "connect..."); if (bluetoothSocket == null) { Log.e("nyz", "connect...failed"); return; } else { Log.e("nyz", "socket 创建成功"); } new Thread() { @Override public void run() { super.run(); try { bluetoothSocket.connect(); // 成功连接 Log.e("nyz", "链接成功..."); InputStream inputStream = bluetoothSocket.getInputStream(); OutputStream outputStream = bluetoothSocket.getOutputStream(); Log.e("nyz", "inputStream " + (inputStream != null)); Log.e("nyz", "outputStream " + (outputStream != null)); } catch (Exception e) { e.printStackTrace(); } } }.start(); } catch (Exception e) { Log.e("nyz", "conn failed");