我最近做了一个简单的多播客户端 - 用于java的服务器聊天，现在我试图在android上移植客户端。
我面临的问题是关于处理套接字：套接字是在一个线程中创建的（因为它会使应用程序崩溃），然后我使用套接字来实现一个InputStreamReader和一个OutputStreamWriter，但是在尝试时要通过按钮侦听器访问以这种方式创建的任何对象，我将获得一个null异常。 另外，如果我将两个读者放在线程之外，他们也会生成一个null异常，即使我确保已经在线程中创建了套接字。
如果有人能帮助我找出问题所在，我会很高兴，我为凌乱的代码道歉
public class ClientActivity extends AppCompatActivity {
public static int PORT = 1050;
public static String ADDRESS = "";
public static String USERNAME = "";
SusListenerThread inT;
public int ID;
public int roomID;
Socket socket = null;
BufferedReader in = null, stdIn = null;
PrintWriter out = null;
InputStreamReader isr;
OutputStreamWriter osw;
String userInput="";
public int mode=1;
public Button Bsend;
public Button Bbroadcast;
public Button Broom;
public EditText editMessage;
public EditText editReplies;
public EditText editRoom;
public TextView txtID;
public TextView txtUsername;
public TextView txtRoom;
public connectSocket coSocket;
public ClientActivity() {
}
public void setStuff(String str, int IDh){
this.ID=IDh;
this.USERNAME=str;
txtID.setText("ID: "+IDh);
txtUsername.setText("Username: "+str);
}
private class SusListenerThread extends Thread{
BufferedReader in = null;
public int ID;
public String username;
public boolean isSet=false;
//public View viiv;
public EditText editReplies;
public TextView txtRoom;
public SusListenerThread(InputStreamReader isr){
//this.viiv=viiv;
//editReplies = (EditText)viiv.findViewById(R.id.editReplies);
//txtRoom = (TextView)viiv.findViewById(R.id.textRoom);
in = new BufferedReader(isr);
//ClientGUI.jTextArea1.append(joj+"\n");
start();
}
@Override
public void run(){
String input="";
getStuff();
while(true)
{
try {
input=in.readLine();
} catch (IOException ex) {
//Logger.getLogger(ListenerThread.class.getName()).log(Level.SEVERE, null, ex);
}
if(input.charAt(0)=='0')
//ClientGUI.jTextArea1.append(input.substring(1)+"\n");
editReplies.append(input.substring(1)+"\n");
else if(input.charAt(0)=='1'){
//ClientGUI.jLabel2.setText("Stanza:"+input.substring(1));
txtRoom.setText("Room: "+input.substring(1));
}
}
}
public void getStuff(){
try {
ID=Integer.parseInt(in.readLine());
username+=in.readLine();
} catch (IOException ex) {
}
isSet=true;
}
}
private class connectSocket extends AsyncTask<Void, Void, Void> {
@Override
protected void onPostExecute(Void result) {
}
@Override
protected Void doInBackground(Void... params) {
try {
socket= new Socket(ADDRESS,PORT);
} catch (IOException e) {
try {
socket = new Socket("127.0.0.1", 1050);
}catch(Exception ex){
e.printStackTrace();
};
}
/*
try{
isr = new InputStreamReader ( socket.getInputStream());
//in = new BufferedReader(isr);
inT=new SusListenerThread(isr);
osw = new OutputStreamWriter ( socket.getOutputStream());
BufferedWriter bw = new BufferedWriter( osw );
out = new PrintWriter (bw, true);
} catch (IOException ex) {}
*/
return null;
}
@Override
protected void onPreExecute() {}
@Override
protected void onProgressUpdate(Void... values) {}
}
private class lilThread extends Thread {
public lilThread(){
start();
}
@Override
public void run(){
try {
socket = new Socket(ADDRESS, PORT);
}catch(Exception e ){
try {
socket = new Socket("79.42.49.56", 1050);
} catch (IOException ex) {ex.printStackTrace();}
}
try {
isr = new InputStreamReader ( socket.getInputStream());
} catch (IOException e) {
e.printStackTrace();
}
inT=new SusListenerThread(isr);
try {
osw = new OutputStreamWriter ( socket.getOutputStream());
} catch (IOException e) {
e.printStackTrace();
}
BufferedWriter bw = new BufferedWriter( osw );
out = new PrintWriter (bw, true);
while(!inT.isSet){
try {
wait(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
setStuff(inT.username.substring(4)/*Mi ritornava nullUtente invece di Utente*/, inT.ID);
try {
wait(10000);
} catch (InterruptedException e) {
e.printStackTrace();
}
try {
join();
} catch (InterruptedException e) {
e.printStackTrace();
}
interrupt();
}
}
public void InitializeStuff(){
lilThread lil = new lilThread();
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_client_activity_gui);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
Bsend = (Button)findViewById(R.id.buttonSenderino);
Bbroadcast = (Button)findViewById(R.id.buttonBroadcast);
Broom = (Button)findViewById(R.id.buttonRoom);
editMessage = (EditText)findViewById(R.id.editMessage);
editReplies = (EditText)findViewById(R.id.editReplies);
editRoom = (EditText)findViewById(R.id.editRoom);
txtID = (TextView)findViewById(R.id.textID);
txtUsername = (TextView)findViewById(R.id.textUsername);
txtRoom = (TextView)findViewById(R.id.textRoom);
this.PORT = getIntent().getExtras().getInt("PORT");
this.ADDRESS = getIntent().getExtras().getString("ADDRESS");
this.USERNAME = getIntent().getExtras().getString("USERNAME");
InitializeStuff();
Bsend.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//userInput= (EditText)v.findViewById(R.id.editMessage).getco;
userInput = editMessage.getText().toString();
if (!"".equals(userInput)) {
out.println(3 + userInput);
editMessage.setText("");
}
}
});
Bbroadcast.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mode=0;
txtRoom.setText("Room: Broadcast");
roomID=-1;
out.println(mode);
editMessage.setText("");
}
});
Broom.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mode=2;
try{
roomID=Integer.parseInt(editRoom.getText().toString());
txtRoom.setText("Stanza: "+roomID);
out.println(mode+""+roomID);
editRoom.setText("");
}catch(Exception e){
txtRoom.setText(" Err ");
}
}
});
}
}