Android Program to Send and Receive Data from Server

Here is source code of the Program to Send and Receive Data From Server. The program is successfully compiled and run on a Windows system using Eclipse Ide. The program output is also shown below.

U send and receive data from server using Google Cloud Messaging. For more information go to :- http://developer.android.com/google/gcm/index.html

Using Google cloud messaging would demand you to set up your own server either on your local host or on the internet , using Google App engine would be beneficial in such a scenario and yes there are other methods too to set up your server. The most important thing however is how to communicate between your application and server . The following code demonstrates how to send and receive data from server set up at parse.com which has already implemented server coding for , you just need to use there Api to send and receive data for more info for setting up a server go through the parse tutorials – www.parse.com

Add

package com.example.travelplanner;
 
import com.parse.Parse;
import com.parse.ParseAnalytics;
import com.parse.ParseObject;
 
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
 
public class Addpool extends Activity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_addpool);
        Parse.initialize(this, "PTVK87QK142x3t2xfuVI1HUN5ahNj1IBaynivYZA",
                "a4kY2kTmf55Uj9wpaTs44dkKhnUCjUNx8AxJpx9C");
        ParseAnalytics.trackAppOpened(getIntent());
 
        final EditText name = (EditText) findViewById(R.id.pool_name);
        final EditText time = (EditText) findViewById(R.id.pool_time);
        final EditText date = (EditText) findViewById(R.id.pool_date);
        final EditText endloc = (EditText) findViewById(R.id.pool_end);
        final EditText strtloc = (EditText) findViewById(R.id.pool_start);
        // intialize the entry here
        final ParseObject carpool = new ParseObject("Pool");
        Button sub = (Button) findViewById(R.id.pool_submit);
        sub.setOnClickListener(new View.OnClickListener() {
 
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                String date1 = date.getText().toString();
                String time1 = time.getText().toString();
                // check what is coming here
                Log.i("date", date.getText().toString());
                if (date1 == "" || time1 == "") {
 
                    Toast.makeText(getApplicationContext(),
                            "Enter both date amd time", Toast.LENGTH_LONG)
                            .show();
                } else {
                    carpool.put("date", date.getText().toString());
                    carpool.put("name", name.getText().toString());
                    carpool.put("time", time.getText().toString());
                    carpool.put("strt_loc", strtloc.getText().toString());
                    carpool.put("end_dest", endloc.getText().toString());
                    carpool.put("pool", "iiitd");
                    carpool.saveInBackground();
                    startActivity(new Intent(Addpool.this, Pool_choose.class));
                }
            }
        });
    }
 
    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
    }
 
    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
        onDestroy();
    }
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.addpool, menu);
        return true;
    }
 
}

I have used Action-bar Pull to Refresh library u can find this and a lot of other fun libraries at www.androidviews.net.
Actvity_Main

package com.example.travelplanner;
 
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.concurrent.ExecutionException;
 
import uk.co.senab.actionbarpulltorefresh.library.PullToRefreshAttacher;
import android.annotation.SuppressLint;
import android.app.ListActivity;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.ListView;
import android.widget.Toast;
 
import com.parse.FindCallback;
import com.parse.Parse;
import com.parse.ParseAnalytics;
import com.parse.ParseObject;
import com.parse.ParseQuery;
 
//have to add a navigation drawer here later change to android list view here -- to be done later
@SuppressLint("SimpleDateFormat")
public class Carpool extends ListActivity implements
        PullToRefreshAttacher.OnRefreshListener {
 
    List<SmsFormat> List = new ArrayList<SmsFormat>();
    private PullToRefreshAttacher mPullToRefreshAttacher;
 
    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
    }
 
    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
        onDestroy();
    }
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
 
        // get the data from the server and display it here
        Log.i("list adapter set", "adapter");
        get();
        mPullToRefreshAttacher = PullToRefreshAttacher.get(this);
        mPullToRefreshAttacher.addRefreshableView(getListView(), this);
 
    }
 
    public void get() {
 
        Parse.initialize(this, "PTVK87QK142x3t2xfuVI1HUN5ahNj1IBaynivYZA",
                "a4kY2kTmf55Uj9wpaTs44dkKhnUCjUNx8AxJpx7C");
        ParseAnalytics.trackAppOpened(getIntent());
 
        ParseQuery<ParseObject> query = ParseQuery.getQuery("Pool");
        SharedPreferences settings = PreferenceManager
                .getDefaultSharedPreferences(this);
        String src_loc = settings.getString("source_location", "n/a");
        String dest_loc = settings.getString("dest_location", "n/a");
 
        query.whereEqualTo("end_dest", dest_loc);
        query.whereEqualTo("strt_loc", src_loc);
        query.findInBackground(new FindCallback<ParseObject>() {
 
            @Override
            public void done(List<ParseObject> objects,
                    com.parse.ParseException e) {
                // TODO Auto-generated method stub
                if (e == null) {
                    Log.d("objects", "Retrieved " + objects.size());
                    for (ParseObject i : objects) {
                        SmsFormat message = new SmsFormat();
                        Log.i("date", i.getString("date"));
                        SimpleDateFormat formatter = new SimpleDateFormat(
                                "dd/MM/yyyy");
                        Date d = null;
                        try {
                            d = formatter.parse(i.getString("date"));
                        } catch (ParseException e1) {
                            // TODO Auto-generated catch block
                            e1.printStackTrace();
                        }
 
                        message.setDate(d);
                        message.setEndDestination(i.getString("end_dest"));
                        message.setName(i.getString("name"));
                        message.setStartDestination(i.getString("strt_loc"));
                        Log.i("time", i.getString("time"));
                        message.setTime(i.getString("time"));
                        Log.i("time_msg", message.getTime());
                        List.add(message);
                        Log.i("list", Integer.toString(List.size()));
                    }
                } else {
                    Log.d("objects", "Error: " + e.getMessage());
                }
 
            }
 
        });
        Log.i("here", "here");
        this.setListAdapter(new ListAdapter(this, List));
 
    }
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.carpool, menu);
        return true;
    }
 
    // on refereshing
    @Override
    public void onRefreshStarted(View view) {
        // TODO Auto-generated method stub
        get();
        new AsyncTask<Void, Void, Void>() {
 
            @Override
            protected Void doInBackground(Void... params) {
                try {
                    Thread.sleep(5000);
                    Log.i("sleep", "asynced sleep");
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                return null;
            }
 
            @Override
            protected void onPostExecute(Void result) {
                super.onPostExecute(result);
 
                // Notify PullToRefreshAttacher that the refresh has finished
                mPullToRefreshAttacher.setRefreshComplete();
            }
        }.execute();
 
    }
 
    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
        SmsFormat sms = (SmsFormat) getListAdapter().getItem(position);
         Log.i("MSG", "hi");
        // use this sms item....
        Toast.makeText(getApplicationContext(), sms.getTime(),
                Toast.LENGTH_LONG).show();
    }
 
}