蓝牙设备的使用

最新推荐文章于 2021-05-25 21:13:33 发布

原创最新推荐文章于 2021-05-25 21:13:33 发布 · 597 阅读

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#button #iterator #null #filter #class

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本文介绍了一个基于Android平台的蓝牙功能实现方案，通过自定义BroadcastReceiver监听蓝牙设备的搜索结果，并提供了按钮来控制蓝牙的开启、可见性和扫描等功能。文中详细展示了如何使用BluetoothAdapter进行蓝牙设备的配对和发现。

public class BlueToothActivity extends Activity {
// 获得BluetoothAdapter对象
private BluetoothAdapter adapter = null;
private BluetoothReceiver receiver = null;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
adapter = BluetoothAdapter.getDefaultAdapter();
//注册Receiver
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
receiver = new BluetoothReceiver();
registerReceiver(receiver, filter);

Button btnTest = (Button) findViewById(R.id.btnTest);
btnTest.setOnClickListener(new ButtonOnClickListener());

Button btnDiscovery = (Button) findViewById(R.id.btnDiscovery);
btnDiscovery.setOnClickListener(new ButtonOnClickListener());

Button btnScan = (Button) findViewById(R.id.btnScan);
btnScan.setOnClickListener(new ButtonOnClickListener());
}

private final class BluetoothReceiver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
   //可以从收到的Intent对象中，将代表远程蓝牙适配器的对象取出
   BluetoothDevice devices = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
}
}

final class ButtonOnClickListener implements OnClickListener {
@Override
public void onClick(final View v) {
   switch (v.getId()) {
   case R.id.btnTest:
    // 判断adapter是否为空，null表明本机没有蓝牙设备
    if (adapter != null) {
     System.out.println("本机拥有蓝牙设备!!!");
     // 是否启用蓝牙设备
     if (!adapter.isEnabled()) {
      Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
      startActivity(intent);
     }
     // 得到所有已经配对的蓝牙适配器对象
     Set<BluetoothDevice> devices = adapter.getBondedDevices();
     if (devices.size() > 0) {
      for (Iterator iterator = devices.iterator(); iterator.hasNext();) {
       BluetoothDevice bluetoothDevice = (BluetoothDevice) iterator.next();
       System.out.println(bluetoothDevice.getAddress());
      }
     }
    } else {
     System.out.println("本机没有蓝牙设备!!!");
    }
    break;
   // 修改蓝牙设备可见性
   case R.id.btnDiscovery:
    Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
    intent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 500);
    startActivity(intent);
    break;
   case R.id.btnScan:
    //发现一个蓝牙设备后会发送一个广播
    adapter.startDiscovery();
    break;
   }
}
}

@Override
protected void onDestroy() {
super.onDestroy();
unregisterReceiver(receiver);
}
}