Simple HTML Reader and HTTP Post implementation on Java for Android.

HTMLPage.java

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.concurrent.ExecutionException;

import android.app.ProgressDialog;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;

public class HTMLPage {

	Context mContext;
	URL url;
	HttpURLConnection mConn;

	public HTMLPage(Context context, String endereco) {
		super();
		this.mContext = context;
		try {
			this.url = new URL(endereco);
		} catch (MalformedURLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public String getHtml() {
		GetHtmlTask task = new GetHtmlTask();
		try {
			String html = task.execute().get();
			return html;
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (ExecutionException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}

	public String getHtmlWithProgress(String message) {
		GetHtmlTask task = new GetHtmlTask(true, message);
		try {
			String html = task.execute().get();
			return html;
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (ExecutionException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}

	class GetHtmlTask extends AsyncTask<Void, Void, String> {

		boolean progDialog = false;
		private ProgressDialog pdia;
		String message;

		public GetHtmlTask() {
			super();
		}

		public GetHtmlTask(boolean progDialog, String message) {
			super();
			this.progDialog = true;
			if (message != null) {
				this.message = message;
			} else {
				this.message = "Carregando";
			}
		}

		@Override
		protected void onPreExecute() {
			// TODO Auto-generated method stub
			super.onPreExecute();
			pdia = new ProgressDialog(mContext);
			pdia.setMessage(message);
			pdia.show();
		}

		@Override
		protected String doInBackground(Void... params) {
			// TODO Auto-generated method stub
			if (isNetworkAvailable()) {
				if (serverResponds()) {
					StringBuilder sb = new StringBuilder();
					BufferedReader reader = null;
					String line = null;

					try {
						InputStream in = new BufferedInputStream(
								mConn.getInputStream());
						reader = new BufferedReader(new InputStreamReader(in));
						while ((line = reader.readLine()) != null) {
							sb.append(line + "\n");
						}
						return sb.toString();
					} catch (IOException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
						return null;
					}
				}
			}
			return null;
		}

		@Override
		protected void onPostExecute(String result) {
			// TODO Auto-generated method stub
			super.onPostExecute(result);
			pdia.dismiss();
		}

	}

	private boolean isNetworkAvailable() {
		// TODO Auto-generated method stub
		ConnectivityManager cm = (ConnectivityManager) mContext
				.getSystemService(Context.CONNECTIVITY_SERVICE);
		NetworkInfo networkInfo = cm.getActiveNetworkInfo();
		if (networkInfo != null && networkInfo.isConnected()) {
			return true;
		}
		return false;
	}

	private boolean serverResponds() {
		int http_status = 0;
		try {
			mConn = (HttpURLConnection) url.openConnection();
			http_status = mConn.getResponseCode();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		if (http_status / 100 != 2) {
			return false;
		} else {
			return true;
		}
	}

}

PostData.java

import java.io.IOException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Scanner;

import android.os.AsyncTask;
import android.util.Log;

public class PostData {
	URL url;

	public PostData(String url) {
		super();
		try {
			this.url = new URL(url);
		} catch (MalformedURLException e) {
			e.printStackTrace();
		}
	}

	public void sendData(ArrayList<String> data)
			throws UnsupportedEncodingException {

		StringBuffer param = new StringBuffer();
		for (int i = 0; i < data.size(); i++) {
			if (i == 0) {
				param.append("param" + String.valueOf(i) + "=");
			} else {
				param.append("&param" + String.valueOf(i) + "=");
			}
			param.append(URLEncoder.encode(data.get(i), "UTF-8"));
		}

		Log.v("params", param.toString());

		SendDataTask task = new SendDataTask(param.toString());
		task.execute();
	}

	private class SendDataTask extends AsyncTask<Void, Void, String> {

		String params;

		public SendDataTask(String params) {
			this.params = params;
		}

		@Override
		protected void onPreExecute() {
			super.onPreExecute();
			Log.v("SendDataTask", "initializing");
		}

		@Override
		protected String doInBackground(Void... arg0) {
			try {
				HttpURLConnection conn = (HttpURLConnection) url
						.openConnection();
				conn.setDoOutput(true);
				conn.setDoInput(true);
				conn.setRequestMethod("POST");
				conn.setFixedLengthStreamingMode(params.getBytes().length);
				conn.setRequestProperty("Content-Type",
						"application/x-www-form-urlencoded");

				PrintWriter out = new PrintWriter(conn.getOutputStream());
				out.print(params);
				out.close();

				// handle the response (opt)
				String response = "";

				Scanner inStream = new Scanner(conn.getInputStream());
				while (inStream.hasNextLine()) {
					response += (inStream.nextLine());
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
			return null;
		}

		@Override
		protected void onPostExecute(String result) {
			super.onPostExecute(result);
			Log.v("SendDataTask", "FINISHED");
		}

	}

}