android tcp 长连接

package com.dingmore.terminal.socket;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.ref.WeakReference;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Arrays;

import android.app.Service;
import android.content.Intent;
import android.os.Handler;
import android.os.IBinder;
import android.os.RemoteException;
import android.support.v4.content.LocalBroadcastManager;
import android.util.Log;

public class SocketService extends Service {
private static final String TAG = "BackService";
private static final long HEART_BEAT_RATE = 30 * 1000;

public static final String HOST = "203.195.143.58";// "192.168.1.21";//
public static final int PORT = 51001;

public static final String MESSAGE_ACTION="com.dingmore.terminal.socket";
public static final String HEART_BEAT_ACTION="com.dingmore.terminal.socket.heart";

public static final String HEART_BEAT_STRING="00";//心跳包内容

private ReadThread mReadThread;

private LocalBroadcastManager mLocalBroadcastManager;

private WeakReference<Socket> mSocket;

// For heart Beat
private Handler mHandler = new Handler();
private Runnable heartBeatRunnable = new Runnable() {

@Override
public void run() {
if (System.currentTimeMillis() - sendTime >= HEART_BEAT_RATE) {
boolean isSuccess = sendMsg(HEART_BEAT_STRING);//就发送一个HEART_BEAT_STRING过去 如果发送失败，就重新初始化一个socket
if (!isSuccess) {
mHandler.removeCallbacks(heartBeatRunnable);
mReadThread.release();
releaseLastSocket(mSocket);
new InitSocketThread().start();
}
}
mHandler.postDelayed(this, HEART_BEAT_RATE);
}
};

private long sendTime = 0L;
private IBackService.Stub iBackService = new IBackService.Stub() {

@Override
public boolean sendMessage(String message) throws RemoteException {
return sendMsg(message);
}
};

@Override
public IBinder onBind(Intent arg0) {
return iBackService;
}

@Override
public void onCreate() {
super.onCreate();
new InitSocketThread().start();
mLocalBroadcastManager=LocalBroadcastManager.getInstance(this);

}
public boolean sendMsg(String msg) {
if (null == mSocket || null == mSocket.get()) {
return false;
}
Socket soc = mSocket.get();
try {
if (!soc.isClosed() && !soc.isOutputShutdown()) {
OutputStream os = soc.getOutputStream();
String message = msg;
os.write(message.getBytes());
os.flush();
sendTime = System.currentTimeMillis();//每次发送成数据，就改一下最后成功发送的时间，节省心跳间隔时间
} else {
return false;
}
} catch (IOException e) {
e.printStackTrace();
return false;
}
return true;
}

private void initSocket() {//初始化Socket
try {
Socket so = new Socket(HOST, PORT);
mSocket = new WeakReference<Socket>(so);
mReadThread = new ReadThread(so);
mReadThread.start();
mHandler.postDelayed(heartBeatRunnable, HEART_BEAT_RATE);//初始化成功后，就准备发送心跳包
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}

private void releaseLastSocket(WeakReference<Socket> mSocket) {
try {
if (null != mSocket) {
Socket sk = mSocket.get();
if (!sk.isClosed()) {
sk.close();
}
sk = null;
mSocket = null;
}
} catch (IOException e) {
e.printStackTrace();
}
}

class InitSocketThread extends Thread {
@Override
public void run() {
super.run();
initSocket();
}
}

// Thread to read content from Socket
class ReadThread extends Thread {
private WeakReference<Socket> mWeakSocket;
private boolean isStart = true;

public ReadThread(Socket socket) {
mWeakSocket = new WeakReference<Socket>(socket);
}

public void release() {
isStart = false;
releaseLastSocket(mWeakSocket);
}

@Override
public void run() {
super.run();
Socket socket = mWeakSocket.get();
if (null != socket) {
try {
InputStream is = socket.getInputStream();
byte[] buffer = new byte[1024 * 4];
int length = 0;
while (!socket.isClosed() && !socket.isInputShutdown()
&& isStart && ((length = is.read(buffer)) != -1)) {
if (length > 0) {
String message = new String(Arrays.copyOf(buffer,
length)).trim();
Log.e(TAG, message);
//收到服务器过来的消息，就通过Broadcast发送出去
if(message.equals(HEART_BEAT_STRING)){//处理心跳回复
Intent intent=new Intent(HEART_BEAT_ACTION);
mLocalBroadcastManager.sendBroadcast(intent);
}else{
//其他消息回复
Intent intent=new Intent(MESSAGE_ACTION);
intent.putExtra("message", message);
mLocalBroadcastManager.sendBroadcast(intent);
}
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}

}

package com.dingmore.terminal.socket;

interface IBackService{
boolean sendMessage(String message);
}

//socket start
@Override
protected void onStart() {
// TODO Auto-generated method stub
super.onStart();
mLocalBroadcastManager.registerReceiver(mReciver, mIntentFilter);
bindService(mServiceIntent, conn, BIND_AUTO_CREATE);
}
@Override
protected void onStop() {
// TODO Auto-generated method stub
unbindService(conn);
mLocalBroadcastManager.unregisterReceiver(mReciver);
super.onStop();
}
private MessageBackReciver mReciver;
private IntentFilter mIntentFilter;
private Intent mServiceIntent;
private LocalBroadcastManager mLocalBroadcastManager;
private IBackService iBackService;
private ServiceConnection conn = new ServiceConnection() {

@Override
public void onServiceDisconnected(ComponentName name) {
iBackService = null;
}

@Override
public void onServiceConnected(ComponentName name, IBinder service) {
iBackService = IBackService.Stub.asInterface(service);
}
};
private void initSocket() {
mLocalBroadcastManager = LocalBroadcastManager.getInstance(this);
mReciver = new MessageBackReciver();
mServiceIntent = new Intent(this, SocketService.class);
mIntentFilter = new IntentFilter();
mIntentFilter.addAction(SocketService.HEART_BEAT_ACTION);
mIntentFilter.addAction(SocketService.MESSAGE_ACTION);

}
class MessageBackReciver extends Broadc
4000
astReceiver {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action.equals(SocketService.HEART_BEAT_ACTION)) {
Toast.makeText(Main2Activity.this, "Get a heart heat",
Toast.LENGTH_SHORT).show();
} else {
String message = intent.getStringExtra("message");
Toast.makeText(Main2Activity.this, message, Toast.LENGTH_SHORT).show();
}
};
}
//socket end