安卓SerialPort类代码

以下是一个使用SerialPort类进行串口通信的安卓示例代码：

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.TextView;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import android_serialport_api.SerialPort;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MainActivity";
    private static final String DEVICE = "/dev/ttySAC1"; // 串口设备文件
    private static final int BAUD_RATE = 9600; // 波特率

    private SerialPort mSerialPort;
    private InputStream mInputStream;
    private OutputStream mOutputStream;

    private TextView mTextView;
    private Handler mHandler;

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

        mTextView = (TextView) findViewById(R.id.textview);
        mHandler = new Handler() {
            @Override
            public void handleMessage(Message msg) {
                if (msg.what == 1) {
                    String data = (String) msg.obj;
                    mTextView.setText(data);
                }
            }
        };

        try {
            mSerialPort = new SerialPort(new File(DEVICE), BAUD_RATE, 0);
            mInputStream = mSerialPort.getInputStream();
            mOutputStream = mSerialPort.getOutputStream();
            new Thread(new Runnable() {
                @Override
                public void run() {
                    while (!Thread.currentThread().isInterrupted()) {
                        int size;
                        try {
                            byte[] buffer = new byte[64];
                            if (mInputStream == null) return;
                            size = mInputStream.read(buffer);
                            if (size > 0) {
                                String data = new String(buffer, 0, size);
                                Message msg = new Message();
                                msg.what = 1;
                                msg.obj = data;
                                mHandler.sendMessage(msg);
                            }
                        } catch (IOException e) {
                            e.printStackTrace();
                            return;
                        }
                    }
                }
            }).start();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (mSerialPort != null) {
            mSerialPort.close();
        }
    }

    private void sendCommand(String command) {
        try {
            mOutputStream.write(command.getBytes());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

这个例子演示了如何使用Android的SerialPort类进行串口通信。在onCreate方法中，打开串口设备文件并获取输入输出流。然后创建一个线程，不断读取串口数据并通过Handler发送消息到主线程进行处理。在sendCommand方法中，可以向串口发送数据。注意，在使用Android的SerialPort类时需要引入相应的库文件。