Example of HttpPost on Android

It's a simple example using HttpPost request to "http://search.yahoo.com/search", with name/value of "p" and "Android".

package com.exercise.AndroidHttpPost;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
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.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;

public class AndroidHttpPostActivity extends Activity {
 
 TextView result;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        result = (TextView)findViewById(R.id.result);
        
        BufferedReader bufferedReader = null;
        HttpClient httpClient = new DefaultHttpClient();
        HttpPost request = new HttpPost("http://search.yahoo.com/search");
        List<NameValuePair> postParameters = new ArrayList<NameValuePair>();
        postParameters.add(new BasicNameValuePair("p", "Android"));
        
        
  try {
   UrlEncodedFormEntity entity = new UrlEncodedFormEntity(postParameters);
         request.setEntity(entity);
           
         HttpResponse response= httpClient.execute(request);

   bufferedReader = new BufferedReader(
           new InputStreamReader(response.getEntity().getContent()));
   StringBuffer stringBuffer = new StringBuffer("");
   String line = "";
   String LineSeparator = System.getProperty("line.separator");
   while ((line = bufferedReader.readLine()) != null) {
    stringBuffer.append(line + LineSeparator); 
   }
   bufferedReader.close();
   
   result.setText(stringBuffer.toString());
   
   Toast.makeText(AndroidHttpPostActivity.this, 
     "Finished", 
     Toast.LENGTH_LONG).show();
   
  } catch (ClientProtocolException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
   Toast.makeText(AndroidHttpPostActivity.this, 
     e.toString(), 
     Toast.LENGTH_LONG).show();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
   Toast.makeText(AndroidHttpPostActivity.this, 
     e.toString(), 
     Toast.LENGTH_LONG).show();
  }finally{
   if (bufferedReader != null){
    try {
     bufferedReader.close();
    } catch (IOException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
   }
  }
        
    }
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
<ScrollView 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"
 >
<TextView  
    android:id="@+id/result"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
</ScrollView>
</LinearLayout>

note: have to modify AndroidManifest.xml to grant permission of "android.permission.INTERNET"



Download the files.



next: Load HTML coded data (returned from HttpPost) into WebView