在 Java 服务器中发送编辑文本时出错.查看代码 [英] Error sending edittext in java server. See code
本文介绍了在 Java 服务器中发送编辑文本时出错.查看代码的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
这是我的工作代码.但是当我尝试单击将我的客户端连接到端口的按钮时，我的应用程序崩溃了.查看我的代码.
Here is a working code of mine. But when I try to click the buttont that connects my client to port, my app crashes. See my code.
public class Order extends Activity {
Button GoBackHome;
private Button button1, button3;
private EditText txtbox1,txtbox2,txtbox3,txtbox4,textField;
private TextView tv;
Button PayNow;
CheckBox chxbx1, chxbx2, chxbx3,chxbx4;
@Override
public void onBackPressed() {
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.order);
GoBackHome = (Button) findViewById(R.id.gohomebutton);
PayNow = (Button) findViewById(R.id.button2);
txtbox1= (EditText) findViewById(R.id.editText1);
button1 = (Button) findViewById(R.id.button1);
tv = (TextView) findViewById(R.id.editText5);
txtbox2= (EditText) findViewById(R.id.editText2);
txtbox3= (EditText) findViewById(R.id.editText3);
txtbox4= (EditText) findViewById(R.id.editText4);
chxbx1 = (CheckBox)findViewById(R.id.checkbox1);
chxbx2 = (CheckBox)findViewById(R.id.checkbox2);
chxbx3 = (CheckBox)findViewById(R.id.checkbox3);
chxbx4 = (CheckBox)findViewById(R.id.checkbox4);
button3 = (Button) findViewById(R.id.button3);
textField = (EditText) findViewById(R.id.editText6);
button1.setOnClickListener(new clicker());
Button get_view_button = (Button) findViewById(R.id.viewsummary);
get_view_button.setOnClickListener(get_view_button_listener);
GoBackHome.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
final Intent i = new Intent(Order.this, MainActivity.class);
startActivity(i);
}
});
PayNow.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
final Intent i = new Intent(Order.this, Payment.class);
startActivity(i);
}
});
chxbx1.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
if (chxbx1.isChecked()) {
txtbox1.setEnabled(true);
txtbox1.setFocusable(true);
} else {
txtbox1.setEnabled(false);
txtbox1.setFocusable(false);
}
}
});
chxbx2.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
if (chxbx2.isChecked()) {
txtbox2.setEnabled(true);
txtbox2.setFocusable(true);
} else {
txtbox2.setEnabled(false);
txtbox2.setFocusable(false);
}
}
});
chxbx3.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
if (chxbx3.isChecked()) {
txtbox3.setEnabled(true);
txtbox3.setFocusable(true);
} else {
txtbox3.setEnabled(false);
txtbox3.setFocusable(false);
}
}
});
chxbx4.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
if (chxbx4.isChecked()) {
txtbox4.setEnabled(true);
txtbox4.setFocusable(true);
} else {
txtbox4.setEnabled(false);
txtbox4.setFocusable(false);
}
}
});
}
private Button.OnClickListener get_view_button_listener = new Button.OnClickListener() {
public void onClick(View v) {
String r = "";
if (chxbx1.isChecked()) {
r = r + "
" + chxbx1.getText() + ".............." + txtbox1.getText().toString();
txtbox1.setEnabled(true);
txtbox1.setFocusable(true);
}
if (chxbx2.isChecked()) {
r = r + "
" + chxbx2.getText() + ".............." + txtbox2.getText().toString();
txtbox2.setEnabled(true);
txtbox2.setFocusable(true);
}
if (chxbx3.isChecked()) {
r = r + "
" + chxbx3.getText() + ".............." + txtbox3.getText().toString();
txtbox3.setEnabled(true);
txtbox3.setFocusable(true);
}
if (chxbx4.isChecked()) {
r = r + "
" + chxbx4.getText() + ".............." + txtbox4.getText().toString();
txtbox4.setEnabled(true);
txtbox4.setFocusable(true);
}
textField.setText(r);
button3.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
new ConnectToServerTask().execute(textField);
}
});
}
};
class clicker implements Button.OnClickListener
{
public void onClick(View v)
{
String a,b,c,d;
Integer vis;
a = txtbox1.getText().toString();
b = txtbox2.getText().toString();
c = txtbox3.getText().toString();
d = txtbox4.getText().toString();
vis = Integer.parseInt(a)*2+Integer.parseInt(b)*3+Integer.parseInt(c)*4+Integer.parseInt(d)*5;
tv.setText(vis.toString());
}
}
}
我不知道下面代码的位置是否在其右侧.
I dont know if the positioning of the below code is on its right section.
button3.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
new ConnectToServerTask().execute
(textField);
}
});
这是我在服务器端的代码:
Here is my code on the server side:
公共类TestTCP{私有静态最终 int 端口 = 1485;
public class TestTCP { private static final int PORT = 1485;
private static ServerSocket serverSocket;
private static Socket clientSocket;
private static InputStreamReader inputStreamReader;
private static BufferedReader bufferedReader;
private static String message;
private static String multiple;
public static void main(String[] args)
{
try
{
serverSocket = new ServerSocket(PORT, 0, InetAddress.getLocalHost());
System.out.println("IP: " + serverSocket.getInetAddress() + " Port: " + serverSocket.getLocalPort());
} catch (IOException e)
{
System.out.println("Could not listen on port: 1447");
}
System.out.println("Server started. Listening to the port 1447");
while (true)
{
try
{{
clientSocket = serverSocket.accept(); // accept the client connection
inputStreamReader = new InputStreamReader(clientSocket.getInputStream());
bufferedReader = new BufferedReader(inputStreamReader); // get the client message
message = bufferedReader.readLine();
while ((message = bufferedReader.readLine()) != null) {
System.out.println("Message from Table 1: " + message);}
inputStreamReader.close();
clientSocket.close();}
} catch (IOException ex)
{
ex.printStackTrace();
System.out.println("Problem in message reading");
}
finally {
try {
if (bufferedReader != null)bufferedReader.close();
} catch (IOException ex) {
ex.printStackTrace();
}
}
}}}
这是针对异步任务的(如果你想看的话):
And this is for the Asynctask (If you want to see it):
public class ConnectToServerTask extends AsyncTask<View, Integer, Socket>
{
private static final String IP_ADDRESS = "192.168.1.102"; // Kerv Server
private static final int DEST_PORT = 1485; //port that is used
private EditText mTextField;
/**
* Store provided views (used later in onPostExecute(...)).
*
* Create socket to communicate with server (blocking call).
*/
protected Socket doInBackground(View... params)
{
// Store provided views.
if (params.length != 1)
throw new IllegalArgumentException();
mTextField = (EditText) params[0];
// Create socket.
Socket client = null;
try
{
client = new Socket(IP_ADDRESS, DEST_PORT); // connect to server
} catch (UnknownHostException e)
{
e.printStackTrace();
} catch (IOException e)
{
e.printStackTrace();
}
return client;
}
/**
* Write to server.
*/
protected void onPostExecute(Socket client)
{
try
{
PrintWriter printwriter;
String messsage;
messsage = mTextField.getText().toString(); // get the text message on the text field
mTextField.setText("
"); // Reset the text field to blank
printwriter = new PrintWriter(client.getOutputStream(), true);
printwriter.write(messsage); // write the message to output stream
printwriter.flush();
printwriter.close();
client.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
逻辑猫:
08-29 07:36:54.398: E/AndroidRuntime(31968): FATAL EXCEPTION: main
08-29 07:36:54.398: E/AndroidRuntime(31968): java.lang.NullPointerException
08-29 07:36:54.398: E/AndroidRuntime(31968): at com.example.controlsystemfinale.ConnectToServerTask.onPostExecute(ConnectToServerTask.java:72)
08-29 07:36:54.398: E/AndroidRuntime(31968): at com.example.controlsystemfinale.ConnectToServerTask.onPostExecute(ConnectToServerTask.java:1)
08-29 07:36:54.398: E/AndroidRuntime(31968): at android.os.AsyncTask.finish(AsyncTask.java:602)
08-29 07:36:54.398: E/AndroidRuntime(31968): at android.os.AsyncTask.access$600(AsyncTask.java:156)
08-29 07:36:54.398: E/AndroidRuntime(31968): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:615)
08-29 07:36:54.398: E/AndroidRuntime(31968): at android.os.Handler.dispatchMessage(Handler.java:99)
08-29 07:36:54.398: E/AndroidRuntime(31968): at android.os.Looper.loop(Looper.java:154)
08-29 07:36:54.398: E/AndroidRuntime(31968): at android.app.ActivityThread.main(ActivityThread.java:4945)
08-29 07:36:54.398: E/AndroidRuntime(31968): at java.lang.reflect.Method.invokeNative(Native Method)
08-29 07:36:54.398: E/AndroidRuntime(31968): at java.lang.reflect.Method.invoke(Method.java:511)
08-29 07:36:54.398: E/AndroidRuntime(31968): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
08-29 07:36:54.398: E/AndroidRuntime(31968): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
08-29 07:36:54.398: E/AndroidRuntime(31968): at dalvik.system.NativeStart.main(Native Method)
推荐答案
看起来问题是 mTextField 在 ConnectToServerTask 中为 null.您要么需要在该类中创建一个构造函数以接受您试图在 onClick() 中传递它的 EditText 但它看起来错误或使其成为内部类.如果你要通过它，那么它应该像
It looks like the problem is that mTextField is null in ConnectToServerTask. You either need to create a constructor in that class to accept an EditText which you are trying to pass it in your onClick() but it looks wrong or make it an inner class. If you are going to pass it then it should be like
new ConnectToServerTask(textField).execute;
然后有一个构造函数来接受 EditText 之类的
then have a constructor to take an EditText like
public ConnectToServerTask(EditText textField)
{
mTextField = textField;
}
这会给您带来更多问题.但是如果你让你的 AsyncTask 成为你的 Activity 的内部类并且 textField 是一个成员变量，那么你的 AsyncTask 将会已经可以访问它而无需传递任何东西.
which is going to cause you more problems. But if you make your AsyncTask an inner class of your Activity and textField is a member variable then your AsyncTask will already have access to it without passing anything.
编辑
public class Order extends Activity {
Button GoBackHome;
private Button button1, button3;
private EditText txtbox1,txtbox2,txtbox3,txtbox4,textField;
private TextView tv;
Button PayNow;
CheckBox chxbx1, chxbx2, chxbx3,chxbx4;
// other functions such as onCreate()
private class ConnectToServerTask extends AsyncTask<View, Integer, Socket> // inner class here inside your Activity
{
private static final String IP_ADDRESS = "192.168.1.102"; // Kerv Server
private static final int DEST_PORT = 1485; //port that is used
private EditText mTextField;
/**
* Store provided views (used later in onPostExecute(...)).
*
* Create socket to communicate with server (blocking call).
*/
protected Socket doInBackground(View... params)
{
这篇关于在 Java 服务器中发送编辑文本时出错.查看代码的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
