SerialPort.java
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/*
* Copyright 2009 Cedric Priscal
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android_serialport_api;
import java.io.BufferedReader;
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.InputStreamReader;
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 {
Log.e(TAG, "1============================");
// Missing read/write permission, trying to chmod the file
Process su;
su = Runtime.getRuntime().exec("/system/xbin/su");
//String cmd = "chmod 666 " + device.getAbsolutePath() + "\n"
//+ "exit\n";
String cmd = "chmod 666 " + device.getAbsolutePath();
Log.e(TAG, "cmd====================="+cmd);
Runtime.getRuntime().exec(cmd);
//su.getOutputStream().write(cmd.getBytes());
if (/*(su.waitFor() != 0) || */!device.canRead()
|| !device.canWrite()) {
Log.e(TAG, "2=====================");
throw new SecurityException();
}
} catch (Exception e) {
Log.e(TAG, "3=================");
e.printStackTrace();
throw new SecurityException();
}
//do_exec("su root\n");
//Log.e(TAG, "=============cmd : "+device.getAbsolutePath());
//do_exec("chmod 755 " + device.getAbsolutePath() + "\n");
//do_exec("rm /sdcard/123");
//Runtime.getRuntime().exec("/system/xbin/su");
//Runtime.getRuntime().exec("chmod 755 /dev/ttyS1");
}
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;
}
String do_exec(String cmd) {
String s = "/n";
try {
Process p = Runtime.getRuntime().exec(cmd);
BufferedReader in = new BufferedReader(
new InputStreamReader(p.getInputStream()));
String line = null;
while ((line = in.readLine()) != null) {
s += line + "/n";
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return cmd;
}
// JNI
private native static FileDescriptor open(String path, int baudrate, int flags);
public native void close();
static {
try {
System.loadLibrary("serial_port");
} catch (Exception e) {
e.printStackTrace();
}catch (Throwable e) {
e.printStackTrace();
}
}
/*
* iD pos机
*/
public SerialPort(String dev, int baudrate, int flags)
throws IOException
{
OpenSerialPort(new File(dev), baudrate, flags);
}
private void OpenSerialPort(File device, int baudrate, int flags) throws IOException {
this.mFd = open(device.getAbsolutePath(), baudrate, flags);
if (this.mFd == null) {
Log.e("SerialPort", "native open returns null");
throw new IOException();
}
this.mFileInputStream = new FileInputStream(this.mFd);
this.mFileOutputStream = new FileOutputStream(this.mFd);
}
}