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要在Android设备上接收串口数据，可以使用Android提供的SerialPort类或第三方库来实现串口通信。以下是一个简单的示例代码，演示如何在Android设备上接收串口数据：
- 首先，添加必要的权限到AndroidManifest.xml文件中：
<uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" /> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" /> <uses-permission android:name="android.permission.READ_PHONE_STATE" /> <uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.WRITE_SETTINGS" /> - 创建一个SerialPort类来处理串口通信：
public class SerialPort { private static final String TAG = SerialPort.class.getSimpleName(); private FileDescriptor mFd; private FileInputStream mFileInputStream; private FileOutputStream mFileOutputStream; public SerialPort(File device, int baudrate, int flags) throws SecurityException, IOException { mFd = open(device.getAbsolutePath(), baudrate, flags); if (mFd == null) { Log.e(TAG, "native open returns null"); throw new IOException(); } mFileInputStream = new FileInputStream(mFd); mFileOutputStream = new FileOutputStream(mFd); } public InputStream getInputStream() { return mFileInputStream; } public OutputStream getOutputStream() { return mFileOutputStream; } private native static FileDescriptor open(String path, int baudrate, int flags); public native void close(); static { System.loadLibrary("serial_port"); } } - 在MainActivity中实现串口数据接收：
public class MainActivity extends AppCompatActivity { private SerialPort mSerialPort; private InputStream mInputStream; private TextView mTextView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mTextView = findViewById(R.id.text_view); try { mSerialPort = new SerialPort(new File("/dev/ttyUSB0"), 9600, 0); mInputStream = mSerialPort.getInputStream(); new Thread(new Runnable() { @Override public void run() { while (true) { try { byte[] buffer = new byte[1024]; int size = mInputStream.read(buffer); if (size > 0) { final String data = new String(buffer, 0, size); runOnUiThread(new Runnable() { @Override public void run() { mTextView.setText(data); } }); } } catch (IOException e) { e.printStackTrace(); } } } }).start(); } catch (SecurityException | IOException e) { e.printStackTrace(); } } @Override protected void onDestroy() { super.onDestroy(); if (mSerialPort != null) { mSerialPort.close(); } } } 在上面的示例中，我们创建了一个SerialPort类来处理串口通信，并在MainActivity中实例化该类来接收串口数据。我们在一个单独的线程中读取串口数据并在UI线程中更新TextView来显示接收到的数据。最后，在Activity销毁时关闭串口连接。请注意，上面的代码仅供参考，实际项目中需要根据具体需求进行修改和优化。
