90 lines
2.3 KiB
Java
90 lines
2.3 KiB
Java
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package android.serialport;
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import java.io.File;
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import java.io.FileDescriptor;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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/**
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* 串口通信，打开串口，读写数据
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*/
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public class SerialPort {
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private FileDescriptor mFd;
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private FileInputStream mFileInputStream;
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private FileOutputStream mFileOutputStream;
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static {
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System.loadLibrary("serial_port");
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}
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/**
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* 打开串口
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*
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* @param device
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* @param baudrate
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*/
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public SerialPort(File device, int baudrate) throws IOException {
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if (!device.canRead() || !device.canWrite()) {
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try {
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Process su;
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su = Runtime.getRuntime().exec("su");
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String cmd = "chmod 777 " + device.getAbsolutePath();
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su.getOutputStream().write(cmd.getBytes());
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su.getOutputStream().flush();
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int waitFor = su.waitFor();
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boolean canRead = device.canRead();
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boolean canWrite = device.canWrite();
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if (waitFor != 0 || !canRead || !canWrite) {
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throw new SecurityException();
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}
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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mFd = open(device.getAbsolutePath(), baudrate);
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if (mFd == null) {
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throw new IOException();
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}
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mFileInputStream = new FileInputStream(mFd);
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mFileOutputStream = new FileOutputStream(mFd);
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}
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/**
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* 关闭串口
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*/
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public void closePort() {
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if (this.mFd != null) {
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try {
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this.close();
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this.mFd = null;
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this.mFileInputStream = null;
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this.mFileOutputStream = null;
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} catch (Exception var2) {
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var2.printStackTrace();
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}
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}
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}
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public InputStream getInputStream() {
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return mFileInputStream;
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}
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public OutputStream getOutputStream() {
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return mFileOutputStream;
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}
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/**
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* JNI，设备地址和波特率
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*/
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private native static FileDescriptor open(String path, int baudrate);
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private native void close();
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}
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