将会话从Android应用程序打开到webview中的网站

我有一个我正在创建的Android应用程序，我有一个登录页面作为第一个意图 . 然后，这将打开一个tabholder并将用户带到第一个显示webview视图的选项卡 . 该网站是应用程序的重要组成部分，需要用户登录 . 网站和应用程序使用相同的登录脚本运行相同的服务器，因此登录信息是相同的 . 我想使用登录webview中的应用程序时创建的会话，以便当用户进入webview时他们仍然登录 . 我尝试使用共享首选项重新登录webview但不是工作 . 我能够将共享偏好传递给它，但它仍然告诉我我没有登录网站 . 任何关于这个主题的帮助将不胜感激 .

这是我的代码：

用于创建defaultHttpRequest的Connection类，我将在所有类之间传递 .

import java.io.IOException;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;

public class Connection1 {


    public static HttpClient httpclient = new DefaultHttpClient();
    private static HttpPost httpPost;

    public Connection1(){
    }

    public HttpPost getHttpPost(){
        return httpPost;
    }
    public HttpResponse getResponse() throws ClientProtocolException, IOException{
        return httpclient.execute(httpPost);
    }
    public void setEntity(UrlEncodedFormEntity entity){
        httpPost.setEntity(entity);
    }
    public void setHttpPost(String script){
        httpPost = new HttpPost(script);
    }
}

将显示网站页面的Webapp类：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.message.BasicNameValuePair;

import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class WebApp extends Activity {

    public static final String PREFS_NAME = "myPrefsFile";
    private static final String PREFS_USERNAME = "username";
    private static final String PREFS_PASSWORD = "password";

    String username = "";
    String password = "";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
    }

    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        setContentView(R.layout.webapp);
        SharedPreferences pref = getSharedPreferences(PREFS_NAME, MODE_PRIVATE);
        username = pref.getString(PREFS_USERNAME, null);
        password = pref.getString(PREFS_PASSWORD, null);
        System.out.println(username + "-" + password);
        postLoginData();


    }

    public void postLoginData() {

        // Create a new HttpClient and Post Header
        Connection1 connection = new Connection1();
        connection
                .setHttpPost("script.php");

        try {

            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
            nameValuePairs.add(new BasicNameValuePair("username", username));
            nameValuePairs.add(new BasicNameValuePair("password", password));
            connection.setEntity(new UrlEncodedFormEntity(nameValuePairs));

            String str = inputStreamToString(
                    connection.getResponse().getEntity().getContent())
                    .toString();

            if (str.toString().equalsIgnoreCase("success")) {
                WebView webapp = (WebView) findViewById(R.id.webView1);  
                webapp.loadUrl("URL");
                webapp.setWebViewClient(new WebViewClient());
                webapp.getSettings().setJavaScriptEnabled(true);
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private StringBuilder inputStreamToString(InputStream is) {
        String line = "";
        StringBuilder total = new StringBuilder();
        // Wrap a BufferedReader around the InputStream
        BufferedReader rd = new BufferedReader(new InputStreamReader(is));
        // Read response until the end
        try {
            while ((line = rd.readLine()) != null) {
                total.append(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        // Return full string
        return total;
    }
}