我试图使用'connection'类在按钮上建立套接字连接，并使用'messagesender'类在按钮上发送消息。我已经创建了一个名为“ messagereceiver”的类，我想在创建套接字到套接字终止（按钮事件终止）之后使用此类接收消息。我对创建“ messagereceiver”类的对象感到困惑，我应该在哪里创建它的对象，以便我可以在套接字的整个生命周期中接收消息。
public class MainActivity extends AppCompatActivity {
static Socket s;
Button conn;
EditText mesg;
EditText ip;
EditText port;
Button send;
Button close;
static PrintWriter PW;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
conn = (Button) findViewById(R.id.button);
send = (Button) findViewById(R.id.button2);
close = (Button)findViewById(R.id.button3);
mesg = (EditText)findViewById(R.id.editText);
ip = (EditText)findViewById(R.id.editText2);
port = (EditText)findViewById(R.id.editText3);
ip.setText("");
port.setText("0");
mesg.setVisibility(View.INVISIBLE);
close.setVisibility(View.INVISIBLE);
send.setVisibility(View.INVISIBLE);
}
public final boolean isInternetOn() {
// get Connectivity Manager object to check connection
ConnectivityManager connec =
(ConnectivityManager)getSystemService(getBaseContext().CONNECTIVITY_SERVICE);
// Check for network connections
if ( connec.getNetworkInfo(0).getState() == android.net.NetworkInfo
.State.CONNECTED ||
connec.getNetworkInfo(0).getState() == android.net.NetworkInfo.State.CONNECTING ||
connec.getNetworkInfo(1).getState() == android.net.NetworkInfo.State.CONNECTING ||
connec.getNetworkInfo(1).getState() == android.net.NetworkInfo.State.CONNECTED ) {
// if connected with internet
// Toast.makeText(this, " Connected ", Toast.LENGTH_LONG).show();
return true;
} else if (
connec.getNetworkInfo(0).getState() == android.net.NetworkInfo.State.DISCONNECTED ||
connec.getNetworkInfo(1).getState() == android.net.NetworkInfo.State.DISCONNECTED ) {
//Toast.makeText(this, " Not Connected ", Toast.LENGTH_LONG).show();
return false;
}
return false;
}
public void conn(View v) {
if (isInternetOn()==true) {
final String IP = ip.getText().toString();
final int PORT = Integer.parseInt(port.getText().toString()) ;
connection c = new connection(IP, PORT);
c.execute();
mesg.setVisibility(View.VISIBLE);
close.setVisibility(View.VISIBLE);
send.setVisibility(View.VISIBLE);
ip.setVisibility(View.INVISIBLE);
port.setVisibility(View.INVISIBLE);
conn.setVisibility(View.INVISIBLE);
}
else
Toast.makeText(getApplicationContext(),"Please Check Your Internet Connection",Toast.LENGTH_LONG).show();
}
public void sendmsg(View v){
messagesender ms = new messagesender();
String ss = mesg.getText().toString();
mesg.setText("");
ms.execute(ss);
}
public void close(View v){
try {
PW.close();
s.close();
conn.setVisibility(View.VISIBLE);
ip.setVisibility(View.VISIBLE);
port.setVisibility(View.VISIBLE);
mesg.setVisibility(View.INVISIBLE);
send.setVisibility(View.INVISIBLE);
close.setVisibility(View.INVISIBLE);
if (s.isClosed()){
Toast.makeText(getApplicationContext(),"Socket is closed",Toast.LENGTH_LONG).show();
}
}
catch (IOException e){
e.printStackTrace();
}
}
class connection extends AsyncTask<String, Integer, Boolean> {
final String i;
int p;
public connection(String i, int p) {
this.i = i;
this.p = p;
}
@Override
protected Boolean doInBackground (String...args) {
try {
s = new Socket(i,p);
System.out.println("connected!");
} catch (IOException e) {
System.out.println(e);
}
return s.isConnected();
}
@Override
protected void onPostExecute(Boolean aBoolean) {
if(s.isConnected())
{
Toast.makeText(getApplicationContext(),"Socket is connected",Toast.LENGTH_LONG).show();
conn.setVisibility(View.INVISIBLE);
}
else
Toast.makeText(getApplicationContext(),"Socket is not connected",Toast.LENGTH_LONG).show();
}
}
private static class messagesender extends AsyncTask<String,Void,Void>{
@Override
protected Void doInBackground(String... Voids) {
String msg = Voids[0];
try {
if(s.isConnected()) {
PW = new PrintWriter(s.getOutputStream());
PW.write(msg+"\n");
PW.flush();
}
}
catch (IOException e){
e.printStackTrace();
}
return null;
}
}
public class messagereceiver extends AsyncTask<String,Void,Void>{
InputStreamReader isr;
String msg ;
BufferedReader br ;
Handler h = new Handler();
@Override
protected Void doInBackground(String... Voids) {
try {
if(s.isConnected()) {
isr = new InputStreamReader(s.getInputStream());
br = new BufferedReader(isr);
msg = br.readLine();
h.post(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(), "Message:" + msg, Toast.LENGTH_LONG).show();
}
});
}}
catch (IOException e){
e.printStackTrace();
}
return null;
}
}
}