Java 套接字客户端+;螺纹+;安卓&x2B;连接状态';s
我对java和Android开发都非常陌生,我正在设计一个Android客户端,用于向服务器发送消息,并从服务器接收消息。它只执行一些功能,首先它将查询服务器的初始状态,然后使用该状态更新按钮,并使用充电符号表示充电器是否正在充电。我已经完成了所有的通信代码,线程似乎能够很好地发送和接收消息,但是线程之外的变量没有被更新,如果我关闭服务器连接,客户端将保持连接打开,就好像服务器仍然在那里一样。谁能给我一些建议,来解决我的问题Java 套接字客户端+;螺纹+;安卓&x2B;连接状态';s,java,android,sockets,client,Java,Android,Sockets,Client,我对java和Android开发都非常陌生,我正在设计一个Android客户端,用于向服务器发送消息,并从服务器接收消息。它只执行一些功能,首先它将查询服务器的初始状态,然后使用该状态更新按钮,并使用充电符号表示充电器是否正在充电。我已经完成了所有的通信代码,线程似乎能够很好地发送和接收消息,但是线程之外的变量没有被更新,如果我关闭服务器连接,客户端将保持连接打开,就好像服务器仍然在那里一样。谁能给我一些建议,来解决我的问题 package charger.app; import java.i
package charger.app;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import android.app.Activity;
import android.os.Bundle;
import android.os.StrictMode;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.Toast;
public class ChargeTabActivity extends Activity {
String serverIp = "192.168.6.120"; //server Ip address
private static String preqon = "control:Charger:1\r\n"; //sets connection to turn charger on
private static String preqoff = "control:Charger:0\r\n"; //Turn charger off
public boolean connected = false; //connection
//set up buttons
private ImageButton chargeOnOff;
private ImageButton connectButton;
//Set it so that Client Functions can be accessed from main program
ClientFunctions functions = new ClientFunctions();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//initialize UI
setContentView(R.layout.main);
//declare buttons for listeners, and display changes
connectButton = (ImageButton)findViewById(R.id.connectButton);
connectButton.setOnClickListener(connectButtonListener);
chargeOnOff = (ImageButton)findViewById(R.id.chargeOnOff);
chargeOnOff.setOnClickListener(chargeOnOffListener);
Button chargeStatus = (Button)findViewById(R.id.chargeStatus);
////set up strict mode off/////
StrictMode.ThreadPolicy policy = new StrictMode.
ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}
/*Listens to see if the connect button is pressed, if it is connected it will
* display connected, else it will try and connect*/
private OnClickListener connectButtonListener = new OnClickListener()
{
public void onClick(View v)
{
if (connected)
{
toast("I am connected");
}
else
{
toast("I am not connected");
}
}
};
/*Listens to see if the Charge on Off Button is pressed, if it is charging it will
* send a request to charge, else it will send a request to stop the charge*/
private OnClickListener chargeOnOffListener = new OnClickListener()
{
public void onClick(View v)
{
//ask server
try {
functions.updateStatus(); //updates the charger status
} catch (IOException e) {
Log.e("Client","Trouble querying",e);
e.printStackTrace();
}
//send message to turn server on or off
if (functions.chargeStatNumber != 0)
{
try {
functions.sendMessage(preqoff);
chargeOnOff.setImageResource(R.drawable.charge_on);
toast("Turning Charger off");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}//end if
else
{
try {
functions.sendMessage(preqon);
chargeOnOff.setImageResource(R.drawable.charge_off);
toast("Turning Charger on");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} //end else
Log.d("ClientActivity", "Charge Button hit" );
//ask server about its status
try {
functions.updateStatus(); //updates the charger status
} catch (IOException e) {
Log.e("Client","Trouble querying",e);
e.printStackTrace();
}
}
};
/////When Application Starts
@Override
public void onStart()
{
super.onStart();
Thread cThread = new Thread(new serverThread()); //Starts the thread that initiates communications
cThread.start();
};
////////On Pause//////This is when a user makes another app, the center point of attention
@Override
public void onPause() {
super.onPause();
functions.closeConnection();
};
//////On Resume/////This is used for when an app exits, and then the user brings it back
@Override
public void onResume() {
super.onResume();
};
//////On Destroy//////////
@Override
public void onDestroy() {
super.onDestroy();
functions.closeConnection();
};
//toast messages
public void toast(String toastMessage)
{
Toast.makeText(DelphiChargeTabActivity.this, toastMessage,
Toast.LENGTH_LONG).show();
};
//Thread to run and receive network connections
public class serverThread implements Runnable
{
public boolean connected = false; //connection
public void run() //runs the thread
{
try
{
functions.connectToServer(serverIp); //connects to server
connected = true;
while (connected)
{
try
{
connectButton.setImageResource(R.drawable.blue_car);
functions.getStreams(); //establish stream connections
functions. updateStatus(); //updates the status of the server
//checkChangeChargeButton(); //sets initial state for charge button
try
{
Thread.sleep(2500);
}
catch ( InterruptedException interruptedException )
{
functions.displayMessage( "\nThread exception" );
} // end catch
}
catch (IOException e)
{
Log.e("Client","Trouble Getting Streams",e);
}
}//end while
}//end try
catch (Exception e)
{
Log.e("Client", "Error Connecting", e);
connected = false;
connectButton.setImageResource(R.drawable.red_car);
}
}; //end run
}; //end serverThread
public void checkChangeChargeButton()
{
if (functions.chargeStatNumber != 0)
{
chargeOnOff.setImageResource(R.drawable.charge_on);
}
else
{
chargeOnOff.setImageResource(R.drawable.charge_off);
}
};
} //This is the Activity close bracket
这是我的函数方法的代码
package charger.app;
import java.io.BufferedWriter;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.net.InetAddress;
import java.net.Socket;
import android.util.Log;
public class ClientFunctions
{
private String message;
private String server;
public Socket sock;
private PrintWriter writer;
private DataInputStream inStream;
public Boolean connected;
private String encode = "UTF8";
public byte[] chargerstat;
public int chargeStatNumber; //Used to set the array byte 15 to an int
//inquires server for status of charge
public void updateStatus() throws IOException
{
//Prompt user for server command
System.out.println("Sending request for Charger status data.");
String serverMessage = "meas:Charger?\r\n";
// send the message
sendMessage("meas:Charger?\r\n");
System.out.println();
displayMessage(serverMessage + "sent");
// now receive the message
receiveMessage();
displayMessage("Receive complete");
};
public void connectToServer(String serverIp) throws IOException //Server IP is sent in main app as String "serverIp"
{
//set server IP
//display logcat trying to connect
displayMessage("\nTrying to Connect");
//Start Socket Connection
sock = new Socket( InetAddress.getByName( serverIp ), 18088);
//Display connected
displayMessage( "\nConnected to: " +
sock.getInetAddress().getHostName() );
};
public void getStreams() throws IOException
{
//Set up PrintWriter
writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(sock.getOutputStream())),true);
writer.flush();
//Set Up I
inStream = new DataInputStream(sock.getInputStream());
//display Message Got I/O
displayMessage("\nGot IO Streams");
};
public void sendMessage(final String serverMessage) throws UnsupportedEncodingException
{
//set variable for message
message = serverMessage;
//sends message
writer.printf("%s", message);
writer.flush();
//display message sent
displayMessage("\nsent" /*+ serverMessage*/);
};
public static int getInt(byte[] array, int offset)
{
return
((array[offset+3] & 0xff) << 24) |
((array[offset+2] & 0xff) << 16) |
((array[offset+1] & 0xff) << 8) |
(array[offset] & 0xff);
}
public void receiveMessage() throws IOException
{
{
int c=0;
int i;
int seqcountval;
chargerstat = new byte[96];
i=0;
while(i < 96)
{
try
{
c = inStream.read();
chargerstat[i] = (byte)c;
}
catch ( IOException ioException )
{
ioException.printStackTrace();
} // end catch
// uncomment this to see each byte
//displayMessage(":" + i + " " + chargerstat[i]);
i++;
}
seqcountval = getInt(chargerstat, 76);
displayMessage("SeqCntr = " + seqcountval);
chargeStatNumber = chargerstat[15];
};
};
public void closeConnection()
{
//closes connections
displayMessage("\n\nClosing Connection");
try
{
writer.close();
inStream.close();
sock.close();
}
catch ( IOException ioException )
{
ioException.printStackTrace();
} // end catch
};
public void displayMessage( final String messageToDisplay )
{
new Runnable()
{
public void run() // updates displayArea
{
//change to log.d for android
System.out.println(messageToDisplay);
} // end method run
}; // end anonymous inner class
} // end method displayMessage
};
package charger.app;
导入java.io.BufferedWriter;
导入java.io.DataInputStream;
导入java.io.IOException;
导入java.io.OutputStreamWriter;
导入java.io.PrintWriter;
导入java.io.UnsupportedEncodingException;
导入java.net.InetAddress;
导入java.net.Socket;
导入android.util.Log;
公共类客户端函数
{
私有字符串消息;
私有字符串服务器;
公共插座;
私人版画作家;
流内私有数据输入流;
公共布尔连接;
私有字符串编码=“UTF8”;
公共字节[]chargerstat;
public int chargeStatNumber;//用于将数组字节15设置为int
//向服务器查询费用状态
public void updateStatus()引发IOException
{
//提示用户输入服务器命令
System.out.println(“发送充电器状态数据请求”);
String serverMessage=“meas:充电器?\r\n”;
//发送消息
sendMessage(“meas:充电器?\r\n”);
System.out.println();
显示消息(serverMessage+“已发送”);
//现在接收消息
receiveMessage();
显示消息(“接收完成”);
};
public void connectToServer(字符串serverIp)抛出IOException//服务器IP在主应用程序中作为字符串“serverIp”发送
{
//设置服务器IP
//显示logcat正在尝试连接
显示消息(“\n正在连接”);
//启动套接字连接
sock=新套接字(InetAddress.getByName(serverIp),18088);
//显示连接
displayMessage(“\n连接到:”+
getInetAddress().getHostName());
};
public void getStreams()引发IOException
{
//设置PrintWriter
writer=new PrintWriter(new BufferedWriter(new OutputStreamWriter(sock.getOutputStream()),true);
writer.flush();
//建立我
inStream=newdatainputstream(sock.getInputStream());
//显示收到的消息I/O
显示消息(“\n输入输出流”);
};
public void sendMessage(最终字符串serverMessage)引发UnsupportedEncodingException
{
//设置消息的变量
message=serverMessage;
//发送消息
writer.printf(“%s”,消息);
writer.flush();
//显示已发送的消息
显示消息(“\n发送”/*+serverMessage*/);
};
公共静态int getInt(字节[]数组,int偏移量)
{
返回
((数组[offset+3]&0xff)不能从不同线程更新UI。必须在主线程中更新UI。如果要从不同线程更新UI,可以执行以下操作
public void changeButtonImage(){
runOnUiThread(new Runnable(){
@Override
public void run() {
connectButton.setImageResource(R.drawable.blue_car);
}});
}
为什么不使用AsyncTask而不是线程,它将更容易共享信息,并且似乎适用于您正在尝试的操作
使用异步任务
AsyncTask允许您对用户执行异步工作
接口。它在工作线程和
然后在UI线程上发布结果,而无需
自己处理线程和/或处理程序
你的“连接”ChargeActivity中的变量与ServerThread中的变量不同,因此ChargeActivity的connect不会从线程中更新。android 4.0之后的ui线程中不能使用socket函数,例如您的connect函数和sendMessage哪些线程外的变量没有被更新?为什么说客户端为keeps连接到服务器(指示是什么)?对不起,我的连接变量以及充电器状态[15],似乎并不总是在线程外更新,我想当一端断开连接时,退出连接状态时会出现问题。连接的内部ServerThread与ChargePractivity中的连接不同。它们之间没有任何关联。好的,谢谢您提供的信息,这是一个非常有用的站点my adventuresIt是一个很棒的网站。如果你接受或更新帮助你或解决问题的答案,它将对你起到更好的作用。它将提高你的接受率,鼓励更多的人帮助你。也就是说,当你确信你的问题已经解决时接受。当你从答案中获得洞察力时,更新投票。