Android: HttpClient POST: NullPointerException

Я новичок в разработке Android с момента покупки EVO несколько месяцев назад.

В любом случае, я разрабатываю свое первое приложение для Android, используя эмулятор Eclipse и Android SDK.

Я пытаюсь сделать простой HTTP POST. Мой реальный код имеет мою регистрационную информацию, жестко закодированную, поэтому я заменил ее тестовой информацией, и я изменил URL-адрес, чтобы просто POST на google.com.

Я получаю исключение NullPointerException при попытке просмотреть ответ запроса HTTP POST.

Я также добавил разрешения на доступ к моему манифестному файлу xml.

Вот мой код.

Editted

Заранее спасибо

:: обновлено::

Я инициализировал объект txtResult TextView, и я получаю новое исключение NullPointerException.

package com.dougi.TexAgsPremiumWidget;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
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;
import org.apache.http.message.BasicNameValuePair;

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.util.Log;
import android.widget.LinearLayout;
import android.widget.TextView;

public class TexAgsPremiumWidget extends Activity {

    LinearLayout layout = new LinearLayout(this);;
    TextView txtResult = new TextView(this);
    ProgressDialog pDialog;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        login();

        layout.addView(txtResult);
        setContentView(layout);

        pDialog = ProgressDialog.show(this, "Loading", "please wait...", true);
    }

    public void login()
    {
        // Create a new HttpClient and Post Header
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost("http://www.google.com");

        try
        {
            List nameValuePairs = new ArrayList(2);
            nameValuePairs.add(new BasicNameValuePair("username", "test"));
            nameValuePairs.add(new BasicNameValuePair("password", "test"));
            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

            // Execute HTTP Post Request
            HttpResponse response = httpclient.execute(httppost);
            txtResult.setText(HttpHelper.request(response));
        } 

        catch (ClientProtocolException e)
        {
            Log.i("httpClientProtocolException", e.toString());
        }

        catch (IOException e)
        {
            Log.i("httpClientIOException", e.toString());
        }
    }
}

вот мой новый журнал ошибок logcat

08-22 20:57:40.153: ERROR/AndroidRuntime(960): ERROR: thread attach failed
08-22 20:57:40.883: ERROR/AndroidRuntime(966): Uncaught handler: thread main exiting due to uncaught exception
08-22 20:57:40.923: ERROR/AndroidRuntime(966): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.dougi.TexAgsPremiumWidget/com.dougi.TexAgsPremiumWidget.TexAgsPremiumWidget}: java.lang.NullPointerException
08-22 20:57:40.923: ERROR/AndroidRuntime(966):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2417)
08-22 20:57:40.923: ERROR/AndroidRuntime(966):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
08-22 20:57:40.923: ERROR/AndroidRuntime(966):     at android.app.ActivityThread.access$2200(ActivityThread.java:119)
08-22 20:57:40.923: ERROR/AndroidRuntime(966):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
08-22 20:57:40.923: ERROR/AndroidRuntime(966):     at android.os.Handler.dispatchMessage(Handler.java:99)
08-22 20:57:40.923: ERROR/AndroidRuntime(966):     at android.os.Looper.loop(Looper.java:123)
08-22 20:57:40.923: ERROR/AndroidRuntime(966):     at android.app.ActivityThread.main(ActivityThread.java:4363)
08-22 20:57:40.923: ERROR/AndroidRuntime(966):     at java.lang.reflect.Method.invokeNative(Native Method)
08-22 20:57:40.923: ERROR/AndroidRuntime(966):     at java.lang.reflect.Method.invoke(Method.java:521)
08-22 20:57:40.923: ERROR/AndroidRuntime(966):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
08-22 20:57:40.923: ERROR/AndroidRuntime(966):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
08-22 20:57:40.923: ERROR/AndroidRuntime(966):     at dalvik.system.NativeStart.main(Native Method)
08-22 20:57:40.923: ERROR/AndroidRuntime(966): Caused by: java.lang.NullPointerException
08-22 20:57:40.923: ERROR/AndroidRuntime(966):     at android.content.ContextWrapper.getResources(ContextWrapper.java:80)
08-22 20:57:40.923: ERROR/AndroidRuntime(966):     at android.view.View.(View.java:1777)
08-22 20:57:40.923: ERROR/AndroidRuntime(966):     at android.view.ViewGroup.(ViewGroup.java:279)
08-22 20:57:40.923: ERROR/AndroidRuntime(966):     at android.widget.LinearLayout.(LinearLayout.java:88)
08-22 20:57:40.923: ERROR/AndroidRuntime(966):     at com.dougi.TexAgsPremiumWidget.TexAgsPremiumWidget.(TexAgsPremiumWidget.java:25)
08-22 20:57:40.923: ERROR/AndroidRuntime(966):     at java.lang.Class.newInstanceImpl(Native Method)
08-22 20:57:40.923: ERROR/AndroidRuntime(966):     at java.lang.Class.newInstance(Class.java:1479)
08-22 20:57:40.923: ERROR/AndroidRuntime(966):     at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
08-22 20:57:40.923: ERROR/AndroidRuntime(966):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2409)
08-22 20:57:40.923: ERROR/AndroidRuntime(966):     ... 11 more