title: Android unable to add getByName
body: <p>I'm trying to add getByName to get the IP address of a hostname and use it in my POST command
  the problem is wherever i insert this code it crashes 
  i tried to insert in doInBackground it also crashes So where should i insert it ??</p>
  
  <pre><code>package com.example.loginad;
  
  
  
  import java.net.InetAddress;
  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.os.AsyncTask;
  import android.os.Bundle;
  import android.app.Activity;
  import android.content.Intent;
  import android.view.Menu;
  import android.view.View;
  import android.widget.Button;
  import android.widget.EditText;
  import android.widget.TextView;
  import android.widget.Toast;
  
  public class Logindb extends Activity {
  Button login;
  EditText u,p;
  TextView res;
  String result;
  String x="mobile";
  String host;
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.logindb);
  
          login=(Button)findViewById(R.id.login);
          u=(EditText)findViewById(R.id.u);
          p=(EditText)findViewById(R.id.p);
          res=(TextView)findViewById(R.id.res);
          login.setOnClickListener(new View.OnClickListener() {
  
              @Override
              public void onClick(View v) {
  
                  new MyAsyncTask().execute(u.getText().toString(),p.getText().toString());
  
  
              }
          });
  
  
  
      }
      private class MyAsyncTask extends AsyncTask&lt;String, Integer, Boolean&gt;{
  
          @Override
          protected Boolean doInBackground(String... params) {
              // TODO Auto-generated method stub
              boolean success = postData(params[0],params[1]);
               try
            {
                   InetAddress address=null;
             address = InetAddress.getByName("Nicky-PC");
                  host=address.getHostAddress();
            }
            catch(Exception e)
            {
               e.printStackTrace();
            } 
              return success;
          }
  
          protected void onPostExecute(Boolean localres){
  
               if (localres){
                      res.setText("A Correct Username and Password");
                  }else{
                      res.setText("Incorrect Username or Password");
                  }
                  Toast.makeText(getApplicationContext(), "command sent", Toast.LENGTH_LONG).show();
          }
          protected void onProgressUpdate(Integer... progress){
              //pb.setProgress(progress[0]);
              //Toast.makeText(getApplicationContext(), "Done", Toast.LENGTH_LONG).show();
  
          }
          /*public void ObtainHost()
          {
              try
              {
  
              }
              catch(Exception e)
              {
                  Toast.makeText(getApplicationContext(), e.toString(), Toast.LENGTH_LONG).show();
              }
  
          } */
  
          public Boolean postData(String a,String b) {
                ArrayList&lt;NameValuePair&gt; postParameters = new ArrayList&lt;NameValuePair&gt;();
                postParameters.add(new BasicNameValuePair("username", a));
                postParameters.add(new BasicNameValuePair("password", b));
                postParameters.add(new BasicNameValuePair("mobileid",x));
                // String valid = "1";
                String response = null;
                try {                 
  
  
                  //  Toast.makeText(getApplicationContext(), host.toString(), Toast.LENGTH_LONG).show();
                   response = CustomHttpClient.executeHttpPost("http://"+host+"/new/check.php",postParameters);
  //now in result you will have the response from php file either 0 or 1.                        
     result = response.toString();
                    // res = res.trim();
                    result = result.replaceAll("\\s+", "");
                    // error.setText(res);
  
                } catch (Exception e) {
                    res.setText(e.toString());
                }
  
             return result.equals("1");
  
          }
  
  
  
      }
  
  
  
  
      @Override
      public boolean onCreateOptionsMenu(Menu menu) {
          // Inflate the menu; this adds items to the action bar if it is present.
          getMenuInflater().inflate(R.menu.logindb, menu);
          return true;
      }
  
  }
  </code></pre>
  
  <p>Stacktrace</p>
  
  <pre><code>11-26 21:28:37.856: D/libEGL(17150): loaded /system/lib/egl/libEGL_genymotion.so
  11-26 21:28:37.876: D/(17150): HostConnection::get() New Host Connection established 0xb8ed35a8, tid 17150
  11-26 21:28:37.900: D/libEGL(17150): loaded /system/lib/egl/libGLESv1_CM_genymotion.so
  11-26 21:28:37.900: D/libEGL(17150): loaded /system/lib/egl/libGLESv2_genymotion.so
  11-26 21:28:37.968: W/EGL_genymotion(17150): eglSurfaceAttrib not implemented
  11-26 21:28:37.976: E/OpenGLRenderer(17150): Getting MAX_TEXTURE_SIZE from GradienCache
  11-26 21:28:37.996: E/OpenGLRenderer(17150): Getting MAX_TEXTURE_SIZE from Caches::initConstraints()
  11-26 21:28:37.996: D/OpenGLRenderer(17150): Enabling debug mode 0
  11-26 21:28:44.876: W/dalvikvm(17150): threadid=13: thread exiting with uncaught exception (group=0xa4c1f648)
  11-26 21:28:44.920: E/AndroidRuntime(17150): FATAL EXCEPTION: AsyncTask #3
  11-26 21:28:44.920: E/AndroidRuntime(17150): java.lang.RuntimeException: An error occured while executing doInBackground()
  11-26 21:28:44.920: E/AndroidRuntime(17150):    at android.os.AsyncTask$3.done(AsyncTask.java:299)
  11-26 21:28:44.920: E/AndroidRuntime(17150):    at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
  11-26 21:28:44.920: E/AndroidRuntime(17150):    at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
  11-26 21:28:44.920: E/AndroidRuntime(17150):    at java.util.concurrent.FutureTask.run(FutureTask.java:239)
  11-26 21:28:44.920: E/AndroidRuntime(17150):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
  11-26 21:28:44.920: E/AndroidRuntime(17150):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
  11-26 21:28:44.920: E/AndroidRuntime(17150):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
  11-26 21:28:44.920: E/AndroidRuntime(17150):    at java.lang.Thread.run(Thread.java:841)
  11-26 21:28:44.920: E/AndroidRuntime(17150): Caused by: android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
  11-26 21:28:44.920: E/AndroidRuntime(17150):    at android.view.ViewRootImpl.checkThread(ViewRootImpl.java:5908)
  11-26 21:28:44.920: E/AndroidRuntime(17150):    at android.view.ViewRootImpl.requestLayout(ViewRootImpl.java:837)
  11-26 21:28:44.920: E/AndroidRuntime(17150):    at android.view.View.requestLayout(View.java:15792)
  11-26 21:28:44.920: E/AndroidRuntime(17150):    at android.view.View.requestLayout(View.java:15792)
  11-26 21:28:44.920: E/AndroidRuntime(17150):    at android.view.View.requestLayout(View.java:15792)
  11-26 21:28:44.920: E/AndroidRuntime(17150):    at android.view.View.requestLayout(View.java:15792)
  11-26 21:28:44.920: E/AndroidRuntime(17150):    at android.widget.RelativeLayout.requestLayout(RelativeLayout.java:358)
  11-26 21:28:44.920: E/AndroidRuntime(17150):    at android.view.View.requestLayout(View.java:15792)
  11-26 21:28:44.920: E/AndroidRuntime(17150):    at android.widget.TextView.checkForRelayout(TextView.java:6524)
  11-26 21:28:44.920: E/AndroidRuntime(17150):    at android.widget.TextView.setText(TextView.java:3771)
  11-26 21:28:44.920: E/AndroidRuntime(17150):    at android.widget.TextView.setText(TextView.java:3629)
  11-26 21:28:44.920: E/AndroidRuntime(17150):    at android.widget.TextView.setText(TextView.java:3604)
  11-26 21:28:44.920: E/AndroidRuntime(17150):    at com.example.loginad.Logindb$MyAsyncTask.postData(Logindb.java:130)
  11-26 21:28:44.920: E/AndroidRuntime(17150):    at com.example.loginad.Logindb$MyAsyncTask.doInBackground(Logindb.java:70)
  11-26 21:28:44.920: E/AndroidRuntime(17150):    at com.example.loginad.Logindb$MyAsyncTask.doInBackground(Logindb.java:1)
  11-26 21:28:44.920: E/AndroidRuntime(17150):    at android.os.AsyncTask$2.call(AsyncTask.java:287)
  11-26 21:28:44.920: E/AndroidRuntime(17150):    at java.util.concurrent.FutureTask.run(FutureTask.java:234)
  11-26 21:28:44.920: E/AndroidRuntime(17150):    ... 4 more
  11-26 21:28:44.932: D/dalvikvm(17150): GC_FOR_ALLOC freed 259K, 5% free 6365K/6660K, paused 8ms, total 8ms
  </code></pre>