引入库类
工具类
public class SerialPort {
private static final String TAG = "SerialPort";
/**
* 不要删除或重命名字段mFd:原生方法close()使用了该字段
*/
private FileDescriptor mFd;
private FileInputStream mFileInputStream;
private FileOutputStream mFileOutputStream;
/**
* 有些设备su路径是/system/xbin/su
*/
private static String mSuPath = "/system/xbin/su";
static {
System.loadLibrary("android_serial_port");
}
public static void setSuPath(String suPath) {
if (TextUtils.isEmpty(suPath)) {
return;
}
mSuPath = suPath;
}
public SerialPort(File device, int baudrate, int flags) throws SecurityException, IOException {
/* 检查访问权限 */
if (!device.canRead() || !device.canWrite()) {
try {
/* 没有读/写权限，尝试对文件进行提权 */
Process su = Runtime.getRuntime().exec(mSuPath);
String cmd = "chmod 666 " + device.getAbsolutePath() + "\n" + "exit\n";
BufferedReader in = new BufferedReader(new InputStreamReader(su.getInputStream()));
BufferedReader ie = new BufferedReader(new InputStreamReader(su.getErrorStream()));
BufferedWriter w = new BufferedWriter(new OutputStreamWriter(su.getOutputStream()));
w.write(cmd);
w.flush();
w.close();
String infoLine = "";
while ((infoLine = in.readLine()) != null) {
Log.d("cmd", "输出:" + infoLine);
}
while ((infoLine = ie.readLine()) != null) {
Log.d("cmd", "错误:" + infoLine);
}
in.close();
ie.close();
// 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.i(TAG, "open() return null");
throw new IOException();
}
mFileInputStream = new FileInputStream(mFd);
mFileOutputStream = new FileOutputStream(mFd);
}
/**
* 打开串口
*
* @param path 设备路径
* @param baudrate 波特率
* @param flags
* @return FileDescriptor
*/
private native static FileDescriptor open(String path, int baudrate, int flags);
/**
* 关闭串口
*/
public native void close();
public InputStream getInputStream() {
return mFileInputStream;
}
public OutputStream getOutputStream() {
return mFileOutputStream;
}
}调用类：
public class IcCardRead {
private static String TAG = "IcCardRead";
private static IcCardRead instance;
public interface IcReadListening{
void onReadIc(String ic);
}
private IcReadListening listening;
public void setListening(IcReadListening listening) {
this.listening = listening;
}
public static IcCardRead getInstance() {
if (instance == null) {
instance = new IcCardRead();
}
return instance;
}
private ExecutorService executorService = Executors.newCachedThreadPool();
private SerialPort serialPort;
private String path = "/dev/ttyCOM1";
private int baudRate = 9600;
private volatile boolean reading;
private IcCardRead() {
}
public synchronized void open(String path, int baudRate) {
try {
if(serialPort != null){
serialPort.close();
serialPort = null;
}
serialPort = new SerialPort(new File(path), baudRate, 0);
read();
} catch (IOException e) {
e.printStackTrace();
}
}
public synchronized void close() {
reading = false;
if (serialPort != null) {
serialPort.close();
serialPort = null;
}
}
private void read() {
if (reading) {
return;
}
reading = true;
executorService.submit(new Runnable() {
@Override
public void run() {
byte[] buffer = new byte[1024];
while (reading) {
try {
if (serialPort.getInputStream().available() > 0) {
Thread.sleep(50);
int size = serialPort.getInputStream().read(buffer);
if (size > 0) {
String s = new String(buffer, 0, size);
s = s.substring(1, s.length() - 1);
Log.i(TAG, s);
if(listening != null){
listening.onReadIc(s);
}
}
}
else {
Thread.sleep(100);
}
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
});
}
}使用方法以读卡器为例：
public class ICCardLoginActivity extends BaseCommonStatusBarActivity {
private static String TAG = "ICCardEntryActivity";
private IcCardRead read;
private TextView tvCrad;
private Button mBack;
@Override
public int getCenterViewLayoutRes() {
return R.layout.activity_ic_card;
}
@Override
public void initView() {
super.initView();
tvCrad = (TextView)findViewById(R.id.tv_card);
mBack = (Button) findViewById(R.id.back);
mBack.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});
read = IcCardRead.getInstance();
read.setListening(new IcCardRead.IcReadListening() {
/**
*
* @param ic 读取到的IC卡号
*/
@Override
public void onReadIc(final String ic) {
runOnUiThread(new Runnable() {
@Override
public void run() {
tvCrad.setText(ic);
finish();
}
});
Log.i(TAG, ic);
}
});
try {
read.open("/dev/ttyS0", 9600);
}catch (Exception e){
e.printStackTrace();
}
}
@Override
protected void onDestroy() {
read.close();
super.onDestroy();
}
}
