Android HttpGet and HttpPost

package com.myapp;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import android.os.Bundle;
import android.os.StrictMode;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.util.Log;
import android.view.View;
import android.view.Menu;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {
	
    
    @SuppressLint("NewApi")
	@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Permission StrictMode
        if (android.os.Build.VERSION.SDK_INT > 9) {
            StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
            StrictMode.setThreadPolicy(policy);
        }
        
        // txtResult
        final TextView result = (TextView)findViewById(R.id.txtResult); 
        // btnGetData
        final Button getData = (Button) findViewById(R.id.btnGetData);
        // Perform action on click
        getData.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
            	String url = "https://www.thaicreate.com/android/getHttpGet.php";
            	String resultServer  = getHttpGet(url);
            	result.setText(resultServer);
            }
        });
        
    }
    

	public String getHttpGet(String url) {
		StringBuilder str = new StringBuilder();
		HttpClient client = new DefaultHttpClient();
		HttpGet httpGet = new HttpGet(url);
		
		try {
			HttpResponse response = client.execute(httpGet);
			StatusLine statusLine = response.getStatusLine();
			int statusCode = statusLine.getStatusCode();
			if (statusCode == 200) { // Status OK
				HttpEntity entity = response.getEntity();
				InputStream content = entity.getContent();
				BufferedReader reader = new BufferedReader(new InputStreamReader(content));
				String line;
				while ((line = reader.readLine()) != null) {
					str.append(line);
				}
			} else {
				Log.e("Log", "Failed to download result..");
			}
		} catch (ClientProtocolException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return str.toString();
	}
	
	
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
    
}

HttpClient client = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);

List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("strA", txtA.getText().toString()));
params.add(new BasicNameValuePair("strB", txtB.getText().toString()));

httpPost.setEntity(new UrlEncodedFormEntity(params));
HttpResponse response = client.execute(httpPost);

<?php
	echo "A+B =".($_POST["strA"]+$_POST["strB"]);
?>

<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/tableLayout1"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
 
   	<TableRow
      android:id="@+id/tableRow1"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content" >
     
     <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="Android HttpPost Example :"
        android:layout_span="1"
        android:textAppearance="?android:attr/textAppearanceLarge" />
  	        
 	</TableRow>

	<View
		android:layout_height="1dip"
		android:background="#CCCCCC" />
 
  <TableLayout 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="0.1"
        android:orientation="horizontal">

      <TextView
          android:id="@+id/textView3"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="Input Text A :"
          android:textAppearance="?android:attr/textAppearanceMedium" />

      <EditText
          android:id="@+id/txtA"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:ems="10" >
      </EditText>

	<TextView
          android:id="@+id/textView4"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="Input Text B :"
          android:textAppearance="?android:attr/textAppearanceMedium" />

      <EditText
          android:id="@+id/txtB"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:ems="10" >
      </EditText>

		<Button
		    android:id="@+id/btnGetData"
		    android:layout_width="wrap_content"
		    android:layout_height="wrap_content"
		    android:text="Get Result from Server" />
		

		<TextView
		    android:id="@+id/txtResult"
		    android:layout_width="wrap_content"
		    android:layout_height="wrap_content"
		    android:text="Result from Server"
		    android:gravity="center_horizontal" />
  	        
 	</TableLayout >

	<View
		android:layout_height="1dip"
		android:background="#CCCCCC" />
   		  
   	<LinearLayout
      android:id="@+id/LinearLayout1"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:padding="5dip" >

   		<TextView
   		    android:id="@+id/textView2"
   		    android:layout_width="wrap_content"
   		    android:layout_height="wrap_content"
   		    android:text="By.. ThaiCreate.Com" />

	</LinearLayout>
	
</TableLayout>