Android Open Source - SDCrimeZone S D Crime Zone Activity

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From Project

Back to project page SDCrimeZone.

License

The source code is released under:

Apache License

Java Source Code

package com.crimezone.sd;
//from w w w. j  a v  a2 s .  c  om
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.List;
import java.util.logging.Logger;

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.json.JSONArray;
import org.json.JSONTokener;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.Toast;

public class SDCrimeZoneActivity extends Activity implements View.OnClickListener {

  public static Location currLocation;
  public static Address _manualAddress;
  public static String selectedRadius;
  public static String selectedDate;
  public LocationManager locationManager;
  public LocationListener locationListener;

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    this.createLocationManager();
    this.initializeApp();
  }
  
  @Override
  public void onPause() {
    super.onPause();
    locationManager.removeUpdates(locationListener);
  }

  /**
   * Take user to landing page for SD Crime Zone. Populate the dropdown boxes
   * (Distance and Date)
   */
  public void initializeApp() {
    setContentView(R.layout.main);
    // get current GPS coordinates and set as default for app
    EditText currLocationText = (EditText) this.findViewById(R.id.addressText);
    currLocationText.setText(getString(R.string.defaultLocation));
    // the distance dropdown list
    Spinner distanceList = (Spinner) this.findViewById(R.id.distanceList);
    populateSpinnerWithArray(distanceList, R.array.distanceArray);
    distanceList.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
      public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
        selectedRadius = parent.getSelectedItem().toString();
        selectedRadius = selectedRadius.replaceFirst("\\smile", "");
      }

      public void onNothingSelected(AdapterView<?> parent) {
        parent.setSelection(1);
        selectedRadius = parent.getSelectedItem().toString();
        selectedRadius = selectedRadius.replaceFirst("\\smile", "");
      }
    });
    distanceList.setSelection(1);

    // the distance dropdown list
    Spinner dateList = (Spinner) this.findViewById(R.id.datesList);
    populateSpinnerWithArray(dateList, R.array.dateArray);
    dateList.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
      public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
        selectedDate = parent.getSelectedItem().toString();
      }

      public void onNothingSelected(AdapterView<?> parent) {
        parent.setSelection(0);
        selectedDate = parent.getSelectedItem().toString();
      }
    });
    Button submitButton = (Button) this.findViewById(R.id.submitButton);
    submitButton.setOnClickListener(this);
  }

  public void createLocationManager() {
    // Acquire a reference to the system Location Manager
    locationManager = (LocationManager) this
        .getSystemService(Context.LOCATION_SERVICE);

    // Define a listener that responds to location updates
    locationListener = new LocationListener() {
      public void onLocationChanged(Location location) {
        // Called when a new location is found by the network location
        // provider.
        locationWasDetected(location);
      }

      public void onStatusChanged(String provider, int status, Bundle extras) {
      }

      public void onProviderEnabled(String provider) {
      }

      public void onProviderDisabled(String provider) {
      }
    };

    // Register the listener with the Location Manager to receive location
    // updates
    registerForLocationUpdates();
  }

  private void registerForLocationUpdates() {
    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
  }

  public void locationWasDetected(Location location) {
    if (usingLocationDetection()) {
      currLocation = location;
    }
    // this.debug("Location= " + String.valueOf(location.getLatitude())
    // + ", " + String.valueOf(location.getLongitude()));
  }

  private boolean usingLocationDetection() {
    EditText addrText = (EditText) this.findViewById(R.id.addressText);
    if (addrText != null
        && addrText.getText().toString().equals(getString(R.string.defaultLocation))
    ) {
      return true;
    } else {
      return false;
    }
  }
  
  @Override
  public void onResume() {
    super.onResume();
    EditText addrText = (EditText) this.findViewById(R.id.addressText);
    addrText.setText(getString(R.string.defaultLocation));
    addrText.selectAll();
    registerForLocationUpdates();
  }

  /**
   * populateSpinnerWithArray Populates dropdown boxes with options, based on
   * string arrays.
   * 
   * @param spinner
   * @param stringArrayResId
   */
  public static void populateSpinnerWithArray(Spinner spinner, int stringArrayResId) {
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(spinner.getContext(),
        android.R.layout.simple_spinner_item, spinner.getContext().getResources()
            .getStringArray(stringArrayResId));
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinner.setAdapter(adapter);
  }

  /**
   * Handles all the apps onclick functions
   * 
   * @param v
   */
  public void onClick(View v) {
    if (v.getId() == R.id.submitButton) {
      ProgressDialog dialog = ProgressDialog.show(this, "", "Loading. Please wait...", true);
      
      try {
        

        JSONArray results = this.sendHttpRequestToServer(v);
        Intent intent = new Intent();
        Bundle bun = new Bundle();
        Log.v("com.crimezone.sd", results.toString());
        bun.putString("results", results.toString()); // add two parameters: a
        // string and a boolean
        EditText addr = (EditText) this.findViewById(R.id.addressText);
        String currentAddress = addr.getText().toString();
        double[] latlong = { 0, 0 };
        
        if (usingLocationDetection()) {
          if ((currLocation == null)) {
            Toast noLocationYet = Toast.makeText(this, "Location Service is still determining your position", 5);
            noLocationYet.show();
            dialog.dismiss();
            return;
          } else { //Location obtained
            SDCrimeZoneApplication.debug(this, "Using detected location");
            latlong[0] = currLocation.getLatitude();
            latlong[1] = currLocation.getLongitude();
            if (!currentAddress.equals(getString(R.string.defaultLocation))) {
              latlong = getLatLong(currentAddress);
            }
          }
        } else { //using manually entered address
          SDCrimeZoneApplication.debug(this, "Using manually entered location");
          latlong[0] = _manualAddress.getLatitude();
          latlong[1] = _manualAddress.getLongitude();
        }

        bun.putString("startLat", String.valueOf(latlong[0]));
        bun.putString("startLng", String.valueOf(latlong[1]));
        bun.putString("year", selectedDate);
        bun.putString("radius", selectedRadius);

         
        /*
         * Check if the current address entered is actually in San Diego
         * 
         *  Fixing issue where the following lat/long is excluded
         *  http://gardenmetrics.com/get.php?lat=32.7742488&lng=-117.1411815&rad=1&year=2011
         *  //Apparent lat/long of Mike's House lat=32.74999737739563 lng=-117.23599791526794
         */
        
        /* raw old code*/ 
        /*
        if (latlong[0] >= 33.427045 || latlong[1] <= -117.612003 || latlong[0] <= 32
            || latlong[1] >= -116.0775811) {
         */ 
          
       
        
        /*  old code prettied up*/
        /*
        if (
            latlong[0] >= 33.427045 || 
            latlong[0] <= 32 || 
            
            latlong[1] <= -117.612003 ||
            latlong[1] >= -116.0775811
            ) {
         */
        
        
        /*  Final version that was supposed to work, but now who knows.
        if (
            latlong[0] <= 32 ||
            33.427045 <= latlong[0] || 
            
            latlong[1] <= -117.612003 || 
            -116.0775811 <= latlong[1]
            ) 
        {*/
        
        
        //Ugly answer for ugly  problem
        boolean exclusionTestFailed = false;
        
        if (latlong[0] <= 32) {
          SDCrimeZoneApplication.debug(this, "Failed FIRST lat/long exclusion test");
          exclusionTestFailed = true;
        }
        
        if (33.427045 <= latlong[0]) {
          SDCrimeZoneApplication.debug(this, "Failed SECOND lat/long exclusion test");
          exclusionTestFailed = true;
        }  
        
        if (latlong[1] <= -117.612003) {
          SDCrimeZoneApplication.debug(this, "Failed THIRD lat/long exclusion test");
          exclusionTestFailed = true;
        } 
        
        if (-116.0775811 <= latlong[1]) {
          SDCrimeZoneApplication.debug(this, "Failed FOURTH lat/long exclusion test");
          exclusionTestFailed = true;
        }
        
        if (exclusionTestFailed) {
          //dialog.dismiss();  //Delete line if dialog works now
          Toast notInSD = Toast.makeText(this, "Currently only supporting San Diego locations", 5);
          notInSD.show();
        } else {  //Location obtained and was not excluded
          intent.setClass(this, SDCrimeSummaryActivity.class);
          intent.putExtras(bun);

          startActivity(intent);

        }
      } catch (Exception e) {
        e.printStackTrace();
        Toast addrNotFound = Toast.makeText(this, "Address Not Found", 5);
        addrNotFound.show();
      }
      dialog.dismiss();
    }

  }

  /**
   * Sends an HttpRequest to SDCrimeZone-AppEngine with lat, long, radius (and
   * date). Gets the JSON result and returns it. Should ONLY be called from main
   * page.
   * 
   **/
  private JSONArray sendHttpRequestToServer(View v) {
    // get the current GPS coordinates, distance, and dates selected

    JSONArray jsonObjs = new JSONArray();

    EditText addr = (EditText) this.findViewById(R.id.addressText);
    Spinner dist = (Spinner) this.findViewById(R.id.distanceList);
    String currentAddress = addr.getText().toString();
    try {

      double[] latlong = { 0, 0 };

      if (currLocation != null) {
        latlong[0] = currLocation.getLatitude();
        latlong[1] = currLocation.getLongitude();
      }
      if (!currentAddress.equals(getString(R.string.defaultLocation))) {
        latlong = getLatLong(currentAddress);
      }
      HttpResponse response;
      HttpClient hc = new DefaultHttpClient();
      
      /** TODO: NEED TO PROVIDE HOST_URL WHERE SERVER IS LOCATED **/
      String HOST_URL = "http://gardenmetrics.com/get.php";
      String httpGetStr = HOST_URL + "?lat=" + String.valueOf(latlong[0])
          + "&lng=" + String.valueOf(latlong[1]) + "&rad=" + selectedRadius + "&year="
          + selectedDate;
      
      SDCrimeZoneApplication.debug(this, httpGetStr);
      HttpGet get = new HttpGet(httpGetStr);
      response = hc.execute(get);

      // get the response from the Google Apps Engine server, should be in
      Reader in = new BufferedReader(new InputStreamReader(response.getEntity().getContent(),"UTF-8"));

      StringBuilder builder = new StringBuilder();

      char[] buf = new char[1000];

      int l = 0;

      while (l >= 0) {

        builder.append(buf, 0, l);

        l = in.read(buf);
      }
      JSONTokener tokener = new JSONTokener(builder.toString());

      JSONArray finalResult = new JSONArray(tokener);

      return finalResult;
    } catch (Exception e) {
      e.printStackTrace();
    }
    return null;

  }

  private double[] getLatLong(String strAddress) {
    Geocoder coder = new Geocoder(this);
    List<Address> resolvedAddresses;

    try {
      resolvedAddresses = coder.getFromLocationName(strAddress, 5);
      if (resolvedAddresses == null) {
        return null;
      }
      
      _manualAddress = resolvedAddresses.get(0); //Hoping the first one works
      double[] results = { _manualAddress.getLatitude(), _manualAddress.getLongitude() };
      
      String strMessage = "Resolved address ["+ strAddress 
      +"] to lat["+ _manualAddress.getLatitude()
      +"] long["+ _manualAddress.getLongitude() +"]";
      
      SDCrimeZoneApplication.debug(this, strMessage);
      
      return results;
    } catch (Exception e) {
      return null;
    }

  }

}

Java Source Code List

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