2016-09-1813:10:03
继承Service，定义抽象方法onDataReceived，子类通过实现抽象方法获取接收到数据的回调。
package com.zrsoft.liftad.serialport; import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream; import android.app.Service;
import android_serialport_api.SerialPort; import com.zrsoft.liftad.MyApp;
import com.zrsoft.liftad.utils.Logger; public abstract class SerialPortService extends Service { protected SerialPort mSerialPort;
protected OutputStream mOutputStream;
private InputStream mInputStream;
private ReadThread mReadThread; private class ReadThread extends Thread {
byte[] buffer = new byte[128]; @Override
public void run() {
super.run();
while (!isInterrupted()) {
int size;
try { if (mInputStream == null)
return;
size = mInputStream.read(buffer);
if (size > 0) {
onDataReceived(buffer, size);
}
} catch (IOException e) {
e.printStackTrace();
return;
}
}
}
} @Override
public void onCreate() {
try {
mSerialPort = new SerialPort(new File("/dev/ttyS3"), 9600, 0);
mOutputStream = mSerialPort.getOutputStream();
mInputStream = mSerialPort.getInputStream(); mReadThread = new ReadThread();
mReadThread.start();
} catch (Exception e) {
e.printStackTrace();
}
} protected abstract void onDataReceived(final byte[] buffer, final int size); @Override
public void onDestroy() {
if (mReadThread != null){
mReadThread.interrupt();
}
if (mSerialPort != null) {
mSerialPort.close();
mSerialPort = null;
}
mSerialPort = null;
super.onDestroy();
}
}
SerialPort 类：
/*
* 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.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 {
try {
System.loadLibrary("serial_port");
} catch (Exception ex) {
Log.d("asdf", ex.getMessage());
}
/* 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();
}
}
Log.d("port", "open ready");
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");
}
}