Question

我试图制作一个启动画面，而我试图通过套接字连接服务器。

我对Android业务很陌生，所以有可能我做错了，无论如何它都行不通。

public class SplashScreen extends Activity {
private Socket socket; // the socket
private final int port = 1500; // the socket port - 1500
private boolean connectivity=false; // if connected to the socket or not
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_splash_screen);
    this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
    ConnectToServer cts= new ConnectToServer();
    cts.execute();}


private class ConnectToServer extends AsyncTask<Void, Void, Void> {

 @Override
 protected Void doInBackground(Void... params) {
     try {
         Log.d("socket", "trying to connect");
         socket = new Socket("10.0.0.11", port);
     } catch (UnknownHostException e1) {
         // TODO Auto-generated catch block
         e1.printStackTrace();
     } catch (IOException e1) {
         // TODO Auto-generated catch block
         e1.printStackTrace();
     }
     if (socket.isConnected())
         connectivity=true;
     return null;
 }}


 protected void onPostExecute() {
// execution of result of Long time consuming operation
 Intent i = new Intent(SplashScreen.this, MainActivity.class);
 i.putExtra("connectivity", connectivity);
 startActivity(i);
 finish();}

Answer 1

OMG！你错放了一个大括号！另外我建议你让这些属性受保护而不是私有它的长故事来解释原因（它阻止创建特殊的静态方法以便能够获得你的私有字段。你无法看到由编译器完成的过程）。

public class SplashScreen extends Activity {
    protected Socket socket; // the socket
    protected final int port = 1500; // the socket port - 1500
    protected boolean connectivity=false;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_splash_screen);
    this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
    ConnectToServer cts= new ConnectToServer();
    cts.execute();
    }

    private class ConnectToServer extends AsyncTask<Void, Void, Void> {

         @Override
         protected Void doInBackground(Void... params) {

             Log.d("socket", "trying to connect");
             try {
                 socket = new Socket("10.0.0.11", port);
             } catch (UnknownHostException e1) {
                 // TODO Auto-generated catch block
                 e1.printStackTrace();
             } catch (IOException e1) {
                 // TODO Auto-generated catch block
                 e1.printStackTrace();
             }
             if (socket.isConnected())
                 connectivity=true;
             return null;
         } // here u have the second } and you finished the class declaration without the following method which is overriden in activity!!!


          @Override
     protected void onPostExecute(Void result) {
        // execution of result of Long time consuming operation
         Intent i = new Intent(getBaseContext(), PreviewActivity.class);
         i.putExtra("connectivity", connectivity);
         startActivity(i);
         finish();

         }
    }
}

使用asynctask android连接到套接字

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