كود برمجي للتعامل مع مكتبة Android GPS

12 فبراير

تحية طيبة لمبرمجي تطبيقات اندرويد ….

يعتبر هذا الكود المفتوح المصدر من الكود البرمجي المهم لمطوري انظمة التعقب باستخدام اجهزة الجي بي اس الملحقة في اجهزة الموبايلات الذكية والتي تعمل بنظام التشغيل اندرويد ….

اولا افتح ملف المينيفيست وهو قلب التطبيق وقم بالتغيرات التالية :-

<?xml version=”1.0″ encoding=”utf-8″?>

<manifest xmlns:android=”http://schemas.android.com/apk/res/android

    package=”com.example.gpstracking”

    android:versionCode=”1″

    android:versionName=”1.0″ >

 

    <uses-sdk android:minSdkVersion=”8″ />

 

    <application

        android:icon=”@drawable/ic_launcher”

        android:label=”@string/app_name” >

        <activity

            android:name=”.AndroidGPSTrackingActivity”

            android:label=”@string/app_name” >

            <intent-filter>

                <action android:name=”android.intent.action.MAIN” />

 

                <category android:name=”android.intent.category.LAUNCHER” />

            </intent-filter>

        </activity>

    </application>

     

    <uses-permission android:name=”android.permission.ACCESS_FINE_LOCATION” />   

    <uses-permission android:name=”android.permission.INTERNET” />

 

</manifest>

ثم انشاء الفئة التالية

GPSTracker.java

package com.example.gpstracking;

 

import android.app.AlertDialog;

import android.app.Service;

import android.content.Context;

import android.content.DialogInterface;

import android.content.Intent;

import android.location.Location;

import android.location.LocationListener;

import android.location.LocationManager;

import android.os.Bundle;

import android.os.IBinder;

import android.provider.Settings;

import android.util.Log;

 

public class GPSTracker extends Service implements LocationListener {

 

    private final Context mContext;

 

    // flag for GPS status

    boolean isGPSEnabled = false;

 

    // flag for network status

    boolean isNetworkEnabled = false;

 

    // flag for GPS status

    boolean canGetLocation = false;

 

    Location location; // location

    double latitude; // latitude

    double longitude; // longitude

 

    // The minimum distance to change Updates in meters

    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters

 

    // The minimum time between updates in milliseconds

    private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute

 

    // Declaring a Location Manager

    protected LocationManager locationManager;

 

    public GPSTracker(Context context) {

        this.mContext = context;

        getLocation();

    }

 

    public Location getLocation() {

        try {

            locationManager = (LocationManager) mContext

                    .getSystemService(LOCATION_SERVICE);

 

            // getting GPS status

            isGPSEnabled = locationManager

                    .isProviderEnabled(LocationManager.GPS_PROVIDER);

 

            // getting network status

            isNetworkEnabled = locationManager

                    .isProviderEnabled(LocationManager.NETWORK_PROVIDER);

 

            if (!isGPSEnabled && !isNetworkEnabled) {

                // no network provider is enabled

            } else {

                this.canGetLocation = true;

                // First get location from Network Provider

                if (isNetworkEnabled) {

                    locationManager.requestLocationUpdates(

                            LocationManager.NETWORK_PROVIDER,

                            MIN_TIME_BW_UPDATES,

                            MIN_DISTANCE_CHANGE_FOR_UPDATES, this);

                    Log.d(“Network”, “Network”);

                    if (locationManager != null) {

                        location = locationManager

                                .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);

                        if (location != null) {

                            latitude = location.getLatitude();

                            longitude = location.getLongitude();

                        }

                    }

                }

                // if GPS Enabled get lat/long using GPS Services

                if (isGPSEnabled) {

                    if (location == null) {

                        locationManager.requestLocationUpdates(

                                LocationManager.GPS_PROVIDER,

                                MIN_TIME_BW_UPDATES,

                                MIN_DISTANCE_CHANGE_FOR_UPDATES, this);

                        Log.d(“GPS Enabled”, “GPS Enabled”);

                        if (locationManager != null) {

                            location = locationManager

                                    .getLastKnownLocation(LocationManager.GPS_PROVIDER);

                            if (location != null) {

                                latitude = location.getLatitude();

                                longitude = location.getLongitude();

                            }

                        }

                    }

                }

            }

 

        } catch (Exception e) {

            e.printStackTrace();

        }

 

        return location;

    }

     

    /**

     * Stop using GPS listener

     * Calling this function will stop using GPS in your app

     * */

    public void stopUsingGPS(){

        if(locationManager != null){

            locationManager.removeUpdates(GPSTracker.this);

        }      

    }

     

    /**

     * Function to get latitude

     * */

    public double getLatitude(){

        if(location != null){

            latitude = location.getLatitude();

        }

         

        // return latitude

        return latitude;

    }

     

    /**

     * Function to get longitude

     * */

    public double getLongitude(){

        if(location != null){

            longitude = location.getLongitude();

        }

         

        // return longitude

        return longitude;

    }

     

    /**

     * Function to check GPS/wifi enabled

     * @return boolean

     * */

    public boolean canGetLocation() {

        return this.canGetLocation;

    }

     

    /**

     * Function to show settings alert dialog

     * On pressing Settings button will lauch Settings Options

     * */

    public void showSettingsAlert(){

        AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);

      

        // Setting Dialog Title

        alertDialog.setTitle(“GPS is settings”);

  

        // Setting Dialog Message

        alertDialog.setMessage(“GPS is not enabled. Do you want to go to settings menu?”);

  

        // On pressing Settings button

        alertDialog.setPositiveButton(“Settings”, new DialogInterface.OnClickListener() {

            public void onClick(DialogInterface dialog,int which) {

                Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);

                mContext.startActivity(intent);

            }

        });

  

        // on pressing cancel button

        alertDialog.setNegativeButton(“Cancel”, new DialogInterface.OnClickListener() {

            public void onClick(DialogInterface dialog, int which) {

            dialog.cancel();

            }

        });

  

        // Showing Alert Message

        alertDialog.show();

    }

 

    @Override

    public void onLocationChanged(Location location) {

    }

 

    @Override

    public void onProviderDisabled(String provider) {

    }

 

    @Override

    public void onProviderEnabled(String provider) {

    }

 

    @Override

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

    }

 

    @Override

    public IBinder onBind(Intent arg0) {

        return null;

    }

 

}

AndroidGPSTrackingActivity.java

package com.example.gpstracking;

 

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.Toast;

 

public class AndroidGPSTrackingActivity extends Activity {

     

    Button btnShowLocation;

     

    // GPSTracker class

    GPSTracker gps;

     

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

         

        btnShowLocation = (Button) findViewById(R.id.btnShowLocation);

         

        // show location button click event

        btnShowLocation.setOnClickListener(new View.OnClickListener() {

             

            @Override

            public void onClick(View arg0) {       

                // create class object

                gps = new GPSTracker(AndroidGPSTrackingActivity.this);

 

                // check if GPS enabled    

                if(gps.canGetLocation()){

                     

                    double latitude = gps.getLatitude();

                    double longitude = gps.getLongitude();

                     

                    // \n is for new line

                    Toast.makeText(getApplicationContext(), “Your Location is – \nLat: ” + latitude + “\nLong: ” + longitude, Toast.LENGTH_LONG).show();   

                }else{

                    // can’t get location

                    // GPS or Network is not enabled

                    // Ask user to enable GPS/network in settings

                    gps.showSettingsAlert();

                }

                 

            }

        });

    }

     

}

للتاكد من فعالية الجي بي اس او من عدمه نستخدم الطريقة التالية :-

GPSTracker gps = new GPSTracker(this);

if(gps.canGetLocation()){ // gps enabled} // return boolean true/false

 

للحصول على خطي اطول والعرض لموقع نستخدم الطريقة التالية :-

gps.getLatitude(); // returns latitude

gps.getLongitude(); // returns longitude

لوقف عمل الجي بي اس نستخدم الطريقة التالية :-

gps.stopUsingGPS();

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