由于移动设备的网络的复杂性,经常会出现网络断开,如果没有心跳包的检测,客户端只会在需要发送数据的时候才知道自己已经断线,会延误,甚至丢失服务器发送过来的数据。一下简单建立一个带有心跳检测的SocketDemo。
Android 后台Servevice
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
package
org.feng.sockettest.server;
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
BackService
extends
Service {
private
static
final
String TAG =
"BackService"
;
private
static
final
long
HEART_BEAT_RATE =
3
*
1000
;
public
static
final
String HOST =
"192.168.1.101"
;
// "192.168.1.21";//
public
static
final
int
PORT =
9800
;
public
static
final
String MESSAGE_ACTION=
"org.feng.message_ACTION"
;
public
static
final
String HEART_BEAT_ACTION=
"org.feng.heart_beat_ACTION"
;
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(
""
);
//就发送一个\r\n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 +
"\r\n"
;
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(
"ok"
)){
//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();
}
}
}
}
}
在Activity中发送以及接收数据:
|