<uses-permission android:name="android.permission.BLUETOOTH"/> <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>  <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> 

public class MainActivity extends AppCompatActivity implements View.OnClickListener {   BluetoothSocket BTSocket;  BluetoothAdapter BTAdapter;  Button bt_start;  TextView tv_msg;  StringBuilder sb;   @Override  protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  bt_start = (Button) findViewById(R.id.bt_start);  tv_msg = (TextView) findViewById(R.id.tv_msg);  bt_start.setOnClickListener(this);  sb = new StringBuilder();  //拿到本地藍(lán)牙設(shè)備  BTAdapter = BluetoothAdapter.getDefaultAdapter();  }   /**  * UI文本輸出  *  * @param msg  */  public void show(String msg) {  sb.append(msg + "/n");  runOnUiThread(new Runnable() {  @Override  public void run() {  tv_msg.setText(sb.toString());  }  });  }   @Override  public void onClick(View v) {  //開啟服務(wù)器  ServerThread startServerThread = new ServerThread();  startServerThread.start();  }   /**  * 開啟服務(wù)器  */  private class ServerThread extends Thread {  public void run() {  try {  BluetoothServerSocket mserverSocket = BTAdapter.listenUsingRfcommWithServiceRecord("btspp",   UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"));  show("服務(wù)端:等待連接");   BTSocket = mserverSocket.accept();  show("服務(wù)端:連接成功");   readThread mreadThread = new readThread();  mreadThread.start();  show("服務(wù)端:啟動接受數(shù)據(jù)");  } catch (IOException e) {  e.printStackTrace();  }  }  }   /**  * 讀取數(shù)據(jù)  */  private class readThread extends Thread {  public void run() {  byte[] buffer = new byte[1024];  int bytes;  InputStream mmInStream = null;  try {  mmInStream = BTSocket.getInputStream();  show("服務(wù)端:獲得輸入流");  } catch (IOException e1) {  e1.printStackTrace();  }  while (true) {  try {   if ((bytes = mmInStream.read(buffer)) > 0) {   byte[] buf_data = new byte[bytes];   for (int i = 0; i < bytes; i++) {   buf_data[i] = buffer[i];   }   String s = new String(buf_data);   show("服務(wù)端:讀取數(shù)據(jù)了~~" + s);   }  } catch (IOException e) {   try {   mmInStream.close();   } catch (IOException e1) {   e1.printStackTrace();   }   break;  }  }  }  }  } 

public class MainActivity extends AppCompatActivity implements View.OnClickListener {   private TextView tv_msg;  private Button bt_search, bt_send;  private BluetoothSocket BTSocket;  private BluetoothAdapter BTAdapter;  private BluetoothDevice device;  private StringBuilder sb;   @Override  protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);   bt_search = (Button) findViewById(R.id.bt_search);  bt_send = (Button) findViewById(R.id.bt_send);  tv_msg = (TextView) findViewById(R.id.tv_msg);  bt_search.setOnClickListener(this);  bt_send.setOnClickListener(this);  sb = new StringBuilder();   show("客戶端:檢查BT");  checkBT(this);  show("客戶端:注冊接收者");  registerBTReceiver();  }   /**  * UI文本輸出  *  * @param msg  */  public void show(String msg) {  sb.append(msg + "/n");  runOnUiThread(new Runnable() {  @Override  public void run() {  tv_msg.setText(sb.toString());  }  });  }   @Override  public void onClick(View v) {  switch (v.getId()) {  case R.id.bt_search:  show("客戶端:開始尋找設(shè)備");  BTAdapter.startDiscovery();  break;  case R.id.bt_send:  sendMessage();  break;  }  }   /**  * 檢查藍(lán)牙  */  public void checkBT(Context context) {  BTAdapter = BluetoothAdapter.getDefaultAdapter();  if (BTAdapter != null) {  if (!BTAdapter.isEnabled()) {  Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);  // 設(shè)置藍(lán)牙可見性，最多300秒  intent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);  context.startActivity(intent);  }  } else {  System.out.println("本地設(shè)備驅(qū)動異常!");  }  }   /**  * 開啟客戶端  */  private class clientThread extends Thread {  public void run() {  try {  //創(chuàng)建一個Socket連接：只需要服務(wù)器在注冊時的UUID號  BTSocket = device.createRfcommSocketToServiceRecord(UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"));  //連接  show("客戶端:開始連接...");  BTSocket.connect();  show("客戶端:連接成功");  //啟動接受數(shù)據(jù)  show("客戶端:啟動接受數(shù)據(jù)");  readThread mreadThread = new readThread();  mreadThread.start();  } catch (IOException e) {  show("客戶端:連接服務(wù)端異常！斷開連接重新試一試");  e.printStackTrace();  }  }  }   /**  * 讀取數(shù)據(jù)  */  private class readThread extends Thread {  public void run() {  byte[] buffer = new byte[1024];  int bytes;  InputStream is = null;  try {  is = BTSocket.getInputStream();  show("客戶端:獲得輸入流");  } catch (IOException e1) {  e1.printStackTrace();  }  while (true) {  try {   if ((bytes = is.read(buffer)) > 0) {   byte[] buf_data = new byte[bytes];   for (int i = 0; i < bytes; i++) {   buf_data[i] = buffer[i];   }   String s = new String(buf_data);   show("客戶端:讀取數(shù)據(jù)了" + s);   }  } catch (IOException e) {   try {   is.close();   } catch (IOException e1) {   e1.printStackTrace();   }   break;  }  }  }  }   /**  * 發(fā)送數(shù)據(jù)  */  public void sendMessage() {  if (BTSocket == null) {  Toast.makeText(this, "沒有連接", Toast.LENGTH_SHORT).show();  return;  }  try {  OutputStream os = BTSocket.getOutputStream();  os.write("我愛你dahsid132456@#%￥*".getBytes());  os.flush();  show("客戶端:發(fā)送信息成功");  } catch (IOException e) {  e.printStackTrace();  }  }   /**  * 注冊廣播  */  public void registerBTReceiver() {  // 設(shè)置廣播信息過濾  IntentFilter intentFilter = new IntentFilter();  intentFilter.addAction(BluetoothDevice.ACTION_FOUND);  intentFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);  intentFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);  intentFilter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);  intentFilter.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED);  // 注冊廣播接收器，接收并處理搜索結(jié)果  registerReceiver(BTReceive, intentFilter);  }   /**  * 注銷廣播  */  public void unregisterBTReceiver() {  unregisterReceiver(BTReceive);  }   @Override  protected void onDestroy() {  super.onDestroy();  unregisterBTReceiver();  }   /**  * 廣播接收者  */  private BroadcastReceiver BTReceive = new BroadcastReceiver() {  @Override  public void onReceive(Context context, Intent intent) {  String action = intent.getAction();  if (BluetoothDevice.ACTION_FOUND.equals(action)) {  device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);  show("客戶端:找到的BT名:" + device.getName());  // 如果查找到的設(shè)備符合要連接的設(shè)備，處理  if (device.getName().equalsIgnoreCase("xu")) {   show("客戶端:配對xu藍(lán)牙:");   // 搜索藍(lán)牙設(shè)備的過程占用資源比較多，一旦找到需要連接的設(shè)備后需要及時關(guān)閉搜索   BTAdapter.cancelDiscovery();   // 獲取藍(lán)牙設(shè)備的連接狀態(tài)   int connectState = device.getBondState();   switch (connectState) {   // 未配對   case BluetoothDevice.BOND_NONE:   show("客戶端:開始配對:");   try {   Method createBondMethod = BluetoothDevice.class.getMethod("createBond");   createBondMethod.invoke(device);   } catch (Exception e) {   e.printStackTrace();   }   break;   // 已配對   case BluetoothDevice.BOND_BONDED:   try {   show("客戶端:開始連接:");   clientThread clientConnectThread = new clientThread();   clientConnectThread.start();   } catch (Exception e) {   e.printStackTrace();   }   break;   }  }  } else if (BluetoothDevice.ACTION_BOND_STATE_CHANGED.equals(action)) {  // 獲取藍(lán)牙設(shè)備的連接狀態(tài)  int connectState = device.getBondState();  // 已配對  if (connectState == BluetoothDevice.BOND_BONDED) {   try {   show("客戶端:開始連接:");   clientThread clientConnectThread = new clientThread();   clientConnectThread.start();   } catch (Exception e) {   e.printStackTrace();   }  }  }  show(action);  }  }; }