蓝牙控制app Android studio代码

以下是一个简单的蓝牙控制 Android 应用程序的代码示例：

1. 首先，在 AndroidManifest.xml 文件中添加以下权限：

<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-feature android:name="android.hardware.bluetooth" />

2. 在你的 Activity 中声明以下变量：

private BluetoothAdapter mBluetoothAdapter;
private BluetoothDevice mDevice;
private BluetoothSocket mSocket;
private OutputStream mOutputStream;
private InputStream mInputStream;

3. 初始化 BluetoothAdapter

mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter == null) {
    // 设备不支持蓝牙
    Toast.makeText(this, "设备不支持蓝牙", Toast.LENGTH_SHORT).show();
    return;
}

4. 搜索并连接蓝牙设备

private void searchAndConnect() {
    Intent intent = new Intent(this, DeviceListActivity.class);
    startActivityForResult(intent, REQUEST_CONNECT_DEVICE);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == REQUEST_CONNECT_DEVICE && resultCode == RESULT_OK) {
        String address = data.getExtras().getString(DeviceListActivity.EXTRA_DEVICE_ADDRESS);
        mDevice = mBluetoothAdapter.getRemoteDevice(address);

        new ConnectThread().start();
    }
}

private class ConnectThread extends Thread {
    public void run() {
        try {
            mSocket = mDevice.createRfcommSocketToServiceRecord(MY_UUID);
            mSocket.connect();
            mOutputStream = mSocket.getOutputStream();
            mInputStream = mSocket.getInputStream();
        } catch (IOException e) {
            e.printStackTrace();
            // 连接失败
            return;
        }

        // 连接成功
    }
}

5. 发送数据

private void sendData(String data) {
    if (mOutputStream == null) {
        // 未连接设备
        return;
    }

    try {
        mOutputStream.write(data.getBytes());
    } catch (IOException e) {
        e.printStackTrace();
        // 发送失败
    }
}

6. 接收数据

private class ReceiveThread extends Thread {
    public void run() {
        byte[] buffer = new byte[1024];
        int bytes;

        while (true) {
            try {
                bytes = mInputStream.read(buffer);
                String data = new String(buffer, 0, bytes);

                // 处理接收到的数据
            } catch (IOException e) {
                e.printStackTrace();
                // 接收失败
                break;
            }
        }
    }
}

注意：这只是一个简单的示例代码，实际应用程序需要更多的错误处理和逻辑来满足需求。