Menu.java :  » App » open-android-navigator » com » Nav » Android Open Source

/**
 *  Description: Provides a menu of buttons that direct the user upon starting the application.
 *  Layout File: res/layout/main.xml
 *  Tutorial Used: http://www.droidnova.com/creating-game-menus-in-android,518.html 
 *  Authors: Eric R. Mixon (eraymix@gmail.com) & David W. McDonald (daveomcd@gmail.com)
 */

package com.Nav;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class Menu extends Activity {
  
  // Saves data between Camera and Map views
  private Intent savedData = new Intent(); 
  
  // ID's for Camera, Map, and GPS Activities
  private static final int CAMERA_RESULT = 0;
  private static final int MAP_RESULT = 1;
  private static final int GPS_ENABLE = 2;
  
  // Location Manager for testing if GPS is enabled
  private LocationManager lm;
  
  // Dialog for when GPS is disabled
  private AlertDialog.Builder dialog;
  
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        // ContentView is set to specified layout in "res/layout/main.xml"
        setContentView(R.layout.main);  
        
        // Set up dialog for GPS being Disabled
    dialog = new AlertDialog.Builder(this);
    dialog.setMessage("This application requires GPS, would you like to enable it?");
    dialog.setCancelable(false);
    
    // Set up Yes button of Dialog to take user to settings page to enable gps
    dialog.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
      public void onClick(DialogInterface dialog, int which) {
          Intent GPSIntent = new Intent(android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
          startActivityForResult(GPSIntent, GPS_ENABLE);        
      }
    });
    
    // Set up No button of Dialog to end the program
    dialog.setNegativeButton("No", new DialogInterface.OnClickListener() {
      public void onClick(DialogInterface dialog, int which) {
          Menu.this.finish();      
      }
    });
        
    // Initialize the Location Manager
    lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        
    // Use Location manager to see if GPS is enabled, if not, show dialog
    if(!lm.isProviderEnabled(LocationManager.GPS_PROVIDER))
    {      
      dialog.show();
    }
    
        /* The below code creates our 3 Menu Buttons */
    
    // Create Button with layout in "res/drawable/camera_button.xml"
        Button SearchButton = (Button)findViewById(R.id.Camera);    
        
        // Create a new listener for button "Camera"
        SearchButton.setOnClickListener(new OnClickListener() {    
          
          // Execute code once the user clicks on "ARCamera" button
          public void onClick(View v) {  
            
            // Create a new Intent for the component ARCamera
            Intent ARCameraIntent = new Intent(Menu.this,ARCamera.class);
            
            // Start the "ARCamera" Activity
            startActivityForResult(ARCameraIntent, CAMERA_RESULT);  
          }
        });
        
        // Create Button with layout in "res/drawable/campusmap_button.xml"
        Button MapButton = (Button)findViewById(R.id.Map);  
        
        // Create a new listener for button "Map"
        MapButton.setOnClickListener(new OnClickListener() {
          
          // Execute code once the user clicks on "Map" button
          public void onClick(View v) {            
            
            // Create a new Intent for the component CampusMap
            Intent MapIntent = new Intent(Menu.this,Map.class);
            
            // Start the "Map" Activity
            startActivityForResult(MapIntent, MAP_RESULT);  
          }
        });
        
        // Create Button with layout in "res/drawable/options_button.xml"
        Button OptionsButton = (Button)findViewById(R.id.Options);    
        
        // Create a new listener for button "Options"
        OptionsButton.setOnClickListener(new OnClickListener() {  
          
          // Execute code once the user clicks on "Options" button
          public void onClick(View v) {              
            
            // Create a new Intent for the component Options
            Intent OptionsIntent = new Intent(Menu.this,Options.class);  
            
            // Start the "Map" Activity
            startActivity(OptionsIntent);              
          }
        });
    }
    
    // Called whenever an Activity that was started from Menu is finished.
    // requestCode - The integer ID of the Activity that has finished
    // resultCode - Whether the Activity ended with RESULT_OK or RESULT_CANCELLED
    // data - The data that is being passed between map and camera activities
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    // Determine which Activity was finished
    switch(requestCode)
    {
      case CAMERA_RESULT:
        // If Camera, then backup data and pass it to Map Activity
        if (resultCode == RESULT_OK) {
          savedData = data;
              Intent MapIntent = new Intent(Menu.this,Map.class);
              MapIntent.putExtras(savedData);
              startActivityForResult(MapIntent, MAP_RESULT);
        }
        break;
        
      case MAP_RESULT:
        // If Map, then backup data and pass it to Camera Activity
        if (resultCode == RESULT_OK) {
          savedData = data;
              Intent CameraIntent = new Intent(Menu.this,ARCamera.class);
              CameraIntent.putExtras(savedData);
              startActivityForResult(CameraIntent, CAMERA_RESULT);
        }
        break;
        
      case GPS_ENABLE:
        // If GPS_ENABLE, then re-check to make sure GPS was turned on
        if(!lm.isProviderEnabled(LocationManager.GPS_PROVIDER))
        {
          dialog.show();
        }
        break;
    }
  }
  
  // Called whenever a physical Key is pressed
  // keyCode - Integer ID of the key pressed (KeyEvent.KEYCODE_KEYNAME)
  public boolean onKeyDown(int keyCode, KeyEvent event)
  {
    // If the back Key was pressed, then finish the program.
    if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0)
    {
      finish();
    }
    
    // else return the normal function of whatever key was pressed
    return super.onKeyDown(keyCode, event);
  }
}