用于交通应用的android gps应用

Question

我目前已经完成了android开发的基础知识，并正在尝试学习如何在智能手机上为我的交通系统项目制作android gps应用程序。在编写复杂代码方面还不是很好。请建议一些资源或教程，这将大大帮助我使这个应用程序。-应用程序将每10秒通过短信发送gps位置(经度和时间)，一旦接近特定路段(可以是0.5公里长的道路)-如果手机经过该特定路段，它将停止发送位置

Answer 1

你为什么要使用短信服务来发送位置？尝试使用the服务。

要实现此应用程序，您必须使用LocationManager和LocationListener库。您可以从创建一个实现LocationListener的gps侦听类开始，如下所示

public class CTLocationListener implements LocationListener{




@Override
public void onLocationChanged(Location location) {
    Log.w("LOCATION CHANGED", ""+location);



    if(location != null) {

        Constants.LATTITUDE = location.getLatitude();
        Constants.LONGITUDE = location.getLongitude();
        Constants.kAccuracy = location.getAccuracy();
        Constants.ALTITUDE_VALUE = location.getAltitude();
    }


}

@Override
public void onProviderDisabled(String provider) {
    Log.i("PROVIDER", "DISABLED:"+provider);


}

@Override
public void onProviderEnabled(String provider) {
    Log.i("PROVIDER", "ENABLED:"+provider);

}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
    Log.i("EXTRAS", ""+extras);
    Log.i("Provider status", ""+status);
}

}

在这里，我将更新的位置存储在常量文件中。启动调度程序，定期检查位置，如果它们与您需要的位置匹配，则开始发送消息。

要触发gps，您可以使用

LocationListener locationListener = new CTLocationListener(); 
LocationManager locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 1.0f, locationListener);

您需要的调度器是一个timertask。这可以实现为

public class showAccuracy extends TimerTask {

    @Override
    public void run() {

        ghandler.post(new Runnable() {

            @Override
            public void run() {
                if((Constants.Latitude == yourlatitude) && .....) {

})；}

}

Answer 2

public class HomeActivity extends Activity implements LocationListener{
public static Context mContext;
private double latitude, longitude;
 public LocationManager mLocManager;

@Override
protected void onCreate(Bundle savedInstanceState) {
    mContext=this;
    super.onCreate(savedInstanceState);
    setContentView(R.layout.homelayout);


    mLocManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

    mLocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,
            this);
    mLocManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0,
            0, this);
    locationUpdate();
    ((Button) this.findViewById(R.id.ButtonHome))
            .setOnClickListener(new OnClickListener() {
                public void onClick(View arg0) {

                        startActivity(new Intent(HomeActivity.this,
                                DefaultDisplay.class));

                }
            });

    ((Button) this.findViewById(R.id.ButtonProfile))
            .setOnClickListener(new OnClickListener() {

                public void onClick(View arg0) {
                    if (GUIStatics.boolLoginStatus) {
                        startActivity(new Intent(HomeActivity.this,
                                MyProfile.class));
                    } else {
                        Intent intent=new Intent(HomeActivity.this,
                                Login.class);
                        intent.putExtra("moveTo","MyProfile");
                        startActivity(intent);
                    }
                }
            });

    ((Button) this.findViewById(R.id.ButtonNotifications))
            .setOnClickListener(new OnClickListener() {

                public void onClick(View arg0) {
                    if (GUIStatics.boolLoginStatus) {
                        startActivity(new Intent(HomeActivity.this,
                                ShowAllNotificationActiviry.class));
                    } else {
                        Intent intent=new Intent(HomeActivity.this,
                                Login.class);
                        intent.putExtra("moveTo","ShowAllNotificationActiviry");
                        startActivity(intent);
                    }
                }
            });

    ((Button) this.findViewById(R.id.ButtonFavorites))
            .setOnClickListener(new OnClickListener() {

                public void onClick(View arg0) {
                    if (GUIStatics.boolLoginStatus) {
                        startActivity(new Intent(HomeActivity.this,
                                FavoritesActivity.class));
                    } else {
                        Intent intent=new Intent(HomeActivity.this,
                                Login.class);
                        intent.putExtra("moveTo","FavoritesActivity");
                        startActivity(intent);
                    }
                }
            });

            ((Button) this.findViewById(R.id.ButtonMore))
            .setOnClickListener(new OnClickListener() {
                public void onClick(View arg0) {
                        startActivity(new Intent(HomeActivity.this,
                                MoreListActivity.class));
                }
            });

}

public void locationUpdate()
{
    CellLocation.requestLocationUpdate();
}


public void getAddress(double lat, double lng) {
    Geocoder geocoder = new Geocoder(HomeActivity.mContext, Locale.getDefault());
    try {
        List<Address> addresses = geocoder.getFromLocation(lat, lng, 1);
        Address obj = addresses.get(0);
        String add = obj.getAddressLine(0);
        GUIStatics.currentAddress = obj.getSubAdminArea() + ","
                + obj.getAdminArea();
        GUIStatics.latitude = obj.getLatitude();
        GUIStatics.longitude = obj.getLongitude();
        GUIStatics.currentCity= obj.getSubAdminArea();
        GUIStatics.currentState= obj.getAdminArea();
        add = add + "\n" + obj.getCountryName();
        add = add + "\n" + obj.getCountryCode();
        add = add + "\n" + obj.getAdminArea();
        add = add + "\n" + obj.getPostalCode();
        add = add + "\n" + obj.getSubAdminArea();
        add = add + "\n" + obj.getLocality();
        add = add + "\n" + obj.getSubThoroughfare();

        Log.v("IGA", "Address" + add);
        // Toast.makeText(this, "Address=>" + add,
        // Toast.LENGTH_SHORT).show();

        // TennisAppActivity.showDialog(add);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show();
    }
}



public void onLocationChanged(Location location) {
    latitude = location.getLatitude();
    longitude = location.getLongitude();
    GUIStatics.latitude=location.getLatitude();
    GUIStatics.longitude= location.getLongitude();
    Log.v("Test", "IGA" + "Lat" + latitude + "   Lng" + longitude);
    //mLocManager.r

    getAddress(latitude, longitude);
    if(location!=null)
    {

    mLocManager.removeUpdates(this);
    }
    // Toast.makeText(this, "Lat" + latitude + "   Lng" + longitude,
    // Toast.LENGTH_SHORT).show();
}


public void onProviderDisabled(String arg0) {
    // TODO Auto-generated method stub
    Toast.makeText(HomeActivity.this, "Gps Disabled", Toast.LENGTH_SHORT).show();
    Intent intent = new Intent(
            android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
    startActivity(intent);
}


public void onProviderEnabled(String arg0) {
    // TODO Auto-generated method stub

}


public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
     if(arg1 == 
            LocationProvider.TEMPORARILY_UNAVAILABLE) { 
                                    Toast.makeText(HomeActivity.this, 
            "LocationProvider.TEMPORARILY_UNAVAILABLE", 
            Toast.LENGTH_SHORT).show(); 
                        } 
                        else if(arg1== LocationProvider.OUT_OF_SERVICE) { 
                                    Toast.makeText(HomeActivity.this, 
            "LocationProvider.OUT_OF_SERVICE", Toast.LENGTH_SHORT).show(); 
                        } 

}

}

这是用于获取经纬度或设备的代码，还使用get address函数获取有关经度的所有信息。

这里的其他一些URL对你来说是非常有用的。http://developer.android.com/reference/android/location/LocationManager.html http://code.google.com/p/open-gpstracker/ http://androidcommunity.com/forums/f4/android-gps-support-and-info-55/ http://www.devx.com/wireless/Article/43005 http://android-er.blogspot.com/2011/02/get-locationlatitude-and-longitude-from.html

我希望这对你很有用。