title: Android : HttpClient POST : NullPointerException
body: <p>I am new to Android development since my EVO purchase a few months ago.</p>
  
  <p>Anyway, I am developing my first Android app using Eclipse and Android SDK emulator.</p>
  
  <p>I am trying to do a simple HTTP POST. My real code has my login information hard coded in so I replaced it with test information and I changed the url as well to simply POST to google.com.</p>
  
  <p>I am getting a NullPointerException when trying to view the HTTP POST request response.</p>
  
  <p>I have added the internet permissions to my manifest xml file as well.</p>
  
  <p>Here is my code.</p>
  
  <p>editted</p>
  
  <p>Thanks in advance</p>
  
  <p>::updated::</p>
  
  <p>I have initialized the txtResult TextView object and I am getting new NullPointerException.</p>
  
  <pre><code>
  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());
          }
      }
  }
  </code></pre>
  
  <p>here is my new logcat error log</p>
  
  <pre><code>
  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
  
  </code></pre>