该楼层疑似违规已被系统折叠 隐藏此楼查看此楼

如题，android串口修改配置后app需要重启才生效问题，第一次安装app配置串口后可立即生效，但是运行之后修改串口配置需要重启app才生效，怎么解决呀

package android_serialport_api;import java.io.File;

import java.io.FileDescriptor;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;import android.util.Log;public class SerialPort { private static final String TAG = "SerialPort"; /*

* Do not remove or rename the field mFd: it is used by native method close();

*/

private FileDescriptor mFd;

private FileInputStream mFileInputStream;

private FileOutputStream mFileOutputStream; public SerialPort(File device, int baudrate, int flags) throws SecurityException, IOException { /* Check access permission */

if (!device.canRead() || !device.canWrite()) {

try {

/* Missing read/write permission, trying to chmod the file */

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);

} // Getters and setters

public InputStream getInputStream() {

return mFileInputStream;

} public OutputStream getOutputStream() {

return mFileOutputStream;

} // JNI

private native static FileDescriptor open(String path, int baudrate, int flags);

public native void close();

static {

System.loadLibrary("serial_port");

}

}