android 串口通讯

关于android串口通讯相关的东西，直接上代码

public class SerialPort {

	private static final String TAG = "SerialPort";

	private FileDescriptor mFd;
	private FileInputStream mFileInputStream;
	private FileOutputStream mFileOutputStream;

	public SerialPort(File device, int baudrate, int flags) throws SecurityException, IOException {

		if (!device.canRead() || !device.canWrite()) {
			try {
				Process su;
				su = Runtime.getRuntime().exec("/system/bin/su");
				String cmd = "chmod 666 " + device.getAbsolutePath() + "\n"
						+ "exit\n";
				su.getOutputStream().write(cmd.getBytes());
				if ((su.waitFor() != 0) || !device.canRead()
						|| !device.canWrite()) {
					throw new SecurityException();
				}
			} catch (Exception e) {
				e.printStackTrace();
				throw new SecurityException();
			}
		}

		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");
	}
}

需要注意的是，这个文件一定要放在根目录的  android_serialport_api 的包名下

// OPEN串口通讯
        try {
            SerialPort serialPort = new SerialPort(new File("你的设备文件地址 eg: /dev/test"),115200,0);
        } catch (IOException e){
            e.printStackTrace();
        }
    
//写入数据
        mOutputStream = serialPort.getOutputStream();
        if (outputStream != null) {
            try {
                outputStream.write(buf);
            } catch (IOException e) {
                
            }
        }
// 读取数据
        mInputStream = serialPort.getInputStream();
// 判断下
    int readLen = mInputStream.available();  
       if（readLen>0）{
        mInputStream.read();
    }

以上就是对串口的数据操作，具体的做法应该是写一个线程去处理相关操作，这里紧紧是把基本的思路做法写出来

还有一个 通用库 libserial_port.so 这个是必须的，网上有很多，下载一个就可以

补充一下：波特率 一般是115200  ，根据实际情况来写