MainActivity.java

package edu.purdue.app.gpshelper;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

import org.apache.http.HttpConnection;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.protocol.BasicHttpContext;

import android.location.Criteria;
import android.location.Location;
import android.location.LocationManager;
import android.location.LocationProvider;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.app.Activity;
import android.content.Context;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

	// So yeah... this is just a micro AWS EC2 instance i have set up... 
	String SERVER_HOST = "http://50.17.239.94/";
	
	EditText etExtraNotes;
	LocationManager locationManager;
	LocationProvider gpsProvider;
	Spinner spin;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		// Populate the spinner with our choices
		spin = (Spinner) findViewById(R.id.spinner_location_type);
		ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, 
				R.array.location_type_choices, android.R.layout.simple_spinner_item);
		adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
		spin.setAdapter(adapter);
		
		// Set the click listener for the button
		Button buLog = (Button) findViewById(R.id.bu_log);
		buLog.setOnClickListener(this);
		
		// Set up the edit text for extra notes
		etExtraNotes = (EditText) findViewById(R.id.et_extra_data);
		
		// Set up the location manager for use later
		locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
		gpsProvider = locationManager.getProvider(LocationManager.GPS_PROVIDER);
	}

	@Override
	public void onClick(View arg0) {
		switch (arg0.getId()) {
		case R.id.bu_log:
			
			// Check if the user has GPS. If the don't, then just ignore the click.
			Location currentLoc = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
			if (currentLoc == null) {
				Toast.makeText(this, "Your device does not appear to have GPS available or enabled.", Toast.LENGTH_LONG)
					.show();
				return;
			}
			
			// Otherwise, get the information from the location
			double latitude = currentLoc.getLatitude();
			double longitude = currentLoc.getLongitude();
			double accuracy = currentLoc.getAccuracy();
			// Altitude, just in case someone on the international space station steals our app
			double altitude = currentLoc.getAltitude();
				
			// Create the URL for the server
			// Not 100% sure how this will work yet, but I figure we can just ping a URL with all the 
			// location data attached then figure it out on the server-side of things.
			final String urlStr = (SERVER_HOST + "log" + 
					"?type=" + getResources().getStringArray(R.array.location_type_choices)[spin.getSelectedItemPosition()] +
					"&lat=" + latitude +
					"&lng=" + longitude + 
					"&acc=" + accuracy +
					"&alt=" + altitude + 
					"&etx=" + etExtraNotes.getText()).replace(" ", "_");
			
			// Create the Toasts that will eventually be shown.
			final Toast successToast = Toast.makeText(this, "Log sent successfully.", Toast.LENGTH_SHORT);
			final Toast failToast = Toast.makeText(this, "Something went wrong. Call Ghostbusters NOW.", Toast.LENGTH_SHORT);
			
			new Thread(new Runnable(){
				@Override
				public void run() {
					try {
						HttpClient http = new DefaultHttpClient();
					    HttpGet httpGet = new HttpGet(urlStr);
					    HttpResponse response = http.execute(httpGet, new BasicHttpContext());
						
					    if (response.getStatusLine().getStatusCode() == 200) {
							successToast.show();
					    } else {
					    	failToast.show();	   
					    }
					    
					} catch (MalformedURLException e) {
						failToast.show();
						e.printStackTrace();
					} catch (IOException e) {
						failToast.show();
						e.printStackTrace();
					}
				}
			}).start();
			
			break;
		}
	}

}