Android Open Source - GroupChat Messaging

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License

The source code is released under:

GNU General Public License

Java Source Code

package in.co.praveenkumar.groupchat;
//from  w w w  .  j  a v  a 2s  .  c  o m
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
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.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class Messaging extends Activity {
  // Settings
  public final String sendDataUrl = "http://groupchat.praveenkumar.co.in/putData.php";
  public final String fetchDataUrl = "http://groupchat.praveenkumar.co.in/messages.txt";
  public final int updateFrequency = 500; // In milli seconds

  public static String nick = "default";
  public static String groupMessage = "No messages as of yet !";
  public static String userMessage = "";

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.messaging);

    // Receive the Nick from previous activity
    Bundle extras = getIntent().getExtras();
    nick = extras.getString("nick");

    // Setting up onClickListeners for send button
    Button loginButton = (Button) findViewById(R.id.sendButton);
    loginButton.setOnClickListener(sendButtonListener);

    // start group message sync
    new tryFetchingData().execute(fetchDataUrl);
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
  }

  private OnClickListener sendButtonListener = new OnClickListener() {
    public void onClick(View v) {
      EditText userTypedMessage = (EditText) findViewById(R.id.userMessageBox);
      userMessage = userTypedMessage.getText().toString();

      // send user message to server
      new trySendingData().execute(sendDataUrl);

      // Clear the field..
      userTypedMessage.setText("");

    }
  };

  // Asynchronous thread for message updation..
  private class tryFetchingData extends AsyncTask<String, Integer, Long> {

    protected Long doInBackground(String... url) {
      getDataFromServer(url[0]);
      return null;
    }

    protected void onProgressUpdate(Integer... progress) {

    }

    @Override
    protected void onPreExecute() {
      super.onPreExecute();
    }

    protected void onPostExecute(Long result) {
      // Update content to the UI..
      updateMessages();

      // Wait before trying for next update..
      Handler myHandler = new Handler();
      myHandler.postDelayed(delayedUpdateLooper, updateFrequency);
    }
  }

  // Asynchronous thread for user message sending..
  private class trySendingData extends AsyncTask<String, Integer, Long> {

    protected Long doInBackground(String... url) {
      sendDataToServer(url[0]);
      return null;
    }

    protected void onProgressUpdate(Integer... progress) {

    }

    @Override
    protected void onPreExecute() {
      super.onPreExecute();
      disableSendButton();
    }

    protected void onPostExecute(Long result) {
      enableSendButton();
    }
  }

  private Runnable delayedUpdateLooper = new Runnable() {
    @Override
    public void run() {
      new tryFetchingData().execute(fetchDataUrl);
    }
  };

  public void disableSendButton() {
    Button sendButton = (Button) this.findViewById(R.id.sendButton);
    sendButton.setEnabled(false);
    sendButton.setText("wait!");
  }

  public void enableSendButton() {
    Button sendButton = (Button) this.findViewById(R.id.sendButton);
    sendButton.setEnabled(true);
    sendButton.setText("send");
  }

  public void updateMessages() {
    TextView groupMessageBox = (TextView) this
        .findViewById(R.id.groupMessageBox);
    groupMessageBox.setText(groupMessage);

  }

  // Send data to server
  public void sendDataToServer(String url) {
    // Making HTTP POST request to send data
    try {
      // A client to do a HTTP Post request
      DefaultHttpClient httpClient = new DefaultHttpClient();
      HttpPost httpPost = new HttpPost(url);

      // Adding nameValuePairs - message as a post variable to the request
      List<NameValuePair> msg = new ArrayList<NameValuePair>();
      msg.add(new BasicNameValuePair("msg", nick + " : " + userMessage));
      httpPost.setEntity(new UrlEncodedFormEntity(msg));

      HttpResponse httpResponse = httpClient.execute(httpPost);
      HttpEntity httpEntity = httpResponse.getEntity();
      if (httpEntity != null) {
        httpEntity.consumeContent();
      }

    } catch (UnsupportedEncodingException e) {
      e.printStackTrace();
    } catch (ClientProtocolException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }

  // Fetching data from server
  public void getDataFromServer(String url) {
    String serverResponse = null;
    InputStream is = null;
    try {
      // A client to get data from data
      DefaultHttpClient httpClient = new DefaultHttpClient();
      HttpGet httpReq = new HttpGet(url);

      HttpResponse httpResponse = httpClient.execute(httpReq);
      HttpEntity httpEntity = httpResponse.getEntity();
      is = httpEntity.getContent();

    } catch (UnsupportedEncodingException e) {
      e.printStackTrace();
    } catch (ClientProtocolException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }

    try {
      BufferedReader reader = new BufferedReader(new InputStreamReader(
          is, "iso-8859-1"), 8);
      StringBuilder sb = new StringBuilder();
      String line = null;

      while ((line = reader.readLine()) != null) {
        sb.append(line + "\n");
      }
      is.close();
      serverResponse = sb.toString();
      if (serverResponse != null)
        groupMessage = serverResponse;
    } catch (Exception e) {
      Log.e("Buffer Error", "Error converting result " + e.toString());
    }

  }
}

Java Source Code List

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