Android App mit Login plus Serverkommunikation

package com.example.serverconnectiontest;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;


public class MainActivity extends ActionBarActivity implements OnClickListener {

Button button;
URL server;
HttpURLConnection connection = null;
String urlparameters;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);

button = (Button)findViewById(R.id.button1);
button.setOnClickListener(this);

return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
try {
server = new URL("blabla");
connection = (HttpURLConnection)server.openConnection();
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
connection.setRequestProperty("Content-Language", "en-US");
connection.setUseCaches(false);
connection.setDoInput(true);
connection.setDoOutput(true);

urlparameters = "fName=" + URLEncoder.encode("???", "UTF-8") + "&lName=" + URLEncoder.encode("???", "UTF-8");

DataOutputStream request = new DataOutputStream (connection.getOutputStream());
request.writeBytes(urlparameters);
request.flush();
request.close();

InputStream inputstream = connection.getInputStream();
BufferedReader rd = new BufferedReader(new InputStreamReader(inputstream));
String line;
StringBuffer response = new StringBuffer();
while((line = rd.readLine()) != null) {
response.append(line);
response.append('\r');
}
rd.close();
return;
} catch(Exception e) {
e.printStackTrace();
return;
} finally {
if(connection != null) {
connection.disconnect();
}
}
}
}

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