1. 确认手机是否支持OTG功能 如果是，可以连接OTG线缆和串口转USB线缆，然后通过USB OTG调试助手查看串口输出信息。
2. 使用Android串口通信库 目前市面上有许多开源的Android串口通信库，比如Android-SerialPort-API和usb-serial-for-android等。使用这些库可以方便地在Android设备上操作串口。 以下是使用Android-SerialPort-API连接串口并读取数据的示例代码：

public class MainActivity extends Activity { private SerialPort mSerialPort; private OutputStream mOutputStream; private InputStream mInputStream; private ReadThread mReadThread;

private class ReadThread extends Thread {
    @Override
    public void run() {
        super.run();
        while (!isInterrupted()) {
            int size;
            try {
                byte[] buffer = new byte[64];
                if (mInputStream == null) return;
                size = mInputStream.read(buffer);
                if (size > 0) {
                    onDataReceived(buffer, size);
                }
            } catch (IOException e) {
                e.printStackTrace();
                return;
            }
        }
    }
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    openSerialPort();
}

private void openSerialPort() {
    try {
        mSerialPort = new SerialPort(new File("/dev/ttyS0"), 115200, 0);
        mOutputStream = mSerialPort.getOutputStream();
        mInputStream = mSerialPort.getInputStream();

        mReadThread = new ReadThread();
        mReadThread.start();

    } catch (IOException e) {
        e.printStackTrace();
    }
}

private void onDataReceived(final byte[] buffer, final int size) {
    runOnUiThread(new Runnable() {
        @Override
        public void run() {
            //将接收到的数据进行处理
        }
    });
}

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

private void closeSerialPort() {
    mReadThread.interrupt();