[英]Use a service to send/receive data through a socket connection.
我创建了一个客户端服务器应用程序,双方使用套接字连接和输入/输出流进行通信以发送/接收数据。 一切都很好,但前提是我只有一个使用该连接的活动。 由于我的应用程序中将有多个活动,并且经过一番搜索后,我得出的结论是我必须创建一个服务来处理套接字连接以及从套接字流发送/接收消息。 我以前从未与Services一起工作过,我认为我一次只能迈出一步。 目前,我刚刚创建了一个服务,该服务创建了我的Client类(扩展了Thread)的实例并启动了该线程,从而建立了与服务器的连接。
我的客户班
T_Client:
public class T_Client extends Thread {
private static final String TAG = "T_Client";
private static String serverIP = "192.168.2.3";
private static int port = 4444;
private InetAddress serverAddr = null;
private Socket sock = null;
private boolean running = false;
private ObjectInputStream in;
private ObjectOutputStream out;
private Object objIn;
public void send(MessageCustom _msg) {
if (out != null) {
try {
out.writeObject(_msg);
out.flush();
Log.i("Send Method", "Outgoing : " + _msg.toString());
} catch (IOException ex) {
Log.e("Send Method", ex.toString());
}
}
}
public void stopClient() {
Log.v(TAG,"stopClient method run");
running = false;
}
@Override
public void run() {
running = true;
try {
serverAddr = InetAddress.getByName(serverIP);
Log.i("TCP Client", "C: Connecting...");
sock = new Socket(serverAddr, port);
try {
out = new ObjectOutputStream(sock.getOutputStream());
in = new ObjectInputStream(sock.getInputStream());
Log.i(TAG, "C: Connected.");
while (running) {
objIn = in.readObject();
Log.i("Object Read Class", objIn.getClass().toString());
Log.i("Object Read", objIn.toString());
}
Log.e("RESPONSE FROM SERVER", "S: Received Message: '" + objIn + "'");
} catch (Exception e) {
Log.e(TAG, "S: Error", e);
} finally {
out.close();
in.close();
sock.close();
Log.i(TAG, "Closing socket: " + sock);
}
} catch (Exception e) {
Log.e(TAG, "C: Error", e);
}
}
}
我的服务等级
我的服务:
public class MyService extends Service {
private static final String TAG = "MyService";
private T_Client client;
@Override
public void onDestroy() {
Log.v(TAG, "onDestroy");
if (client != null) {
try {
client.stopClient();
} catch (Exception e) {
Log.e(TAG, "Error on close: " + e);
}
}
super.onDestroy();
Toast.makeText(this, "Service stopped", Toast.LENGTH_LONG).show();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.v(TAG, "onStartCommand");
client = new T_Client();
client.start();
Toast.makeText(this, "Service started", Toast.LENGTH_LONG).show();
return START_STICKY;
}
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
}
我目前在主要活动中所做的就是使用“开始”和“停止”按钮来启动/停止服务
public void start(View v){
Log.i(TAG,"Start pressed");
Intent intent=new Intent(getBaseContext(),MyService.class);
startService(intent);
}
public void stop(View v){
Log.i(TAG,"Stop pressed");
Intent intent=new Intent(getBaseContext(),MyService.class);
stopService(intent);
}
所以我的问题是:
非常感谢能指导我解决问题的任何意见。
先感谢您。
如果其他人遇到这个问题,也有类似的问题,我设法通过解决这两篇文章中的代码来解决我的问题
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