Android GPS source code

Most new Android phone incorporate GPS devices. Location based services has become pretty standard in the past few years. We are going to build GPS based application to provide us Qiblat location to Mecca.


We are going to use GPS devices to give us more acccurate location since most phone board do have GPS devices.

Image


We edit our android virtual devices (AVD) to include GPS support for our emulation and testing devices.


 


Image


We will use public class LocationManager



Class Overview
This class provides access to the system location services. These services allow applications to obtain periodic updates of the device's geographical location, or to fire an application-specified Intent when the device enters the proximity of a given geographical location.


Image


We modify the AndroidManifest.xml to include the permission.


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

<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />


Source code from Javacodegeeks.


 


package com.javacodegeeks.android.lbs;


import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;


public class LbsGeocodingActivity extends Activity {

private static final long MINIMUM_DISTANCE_CHANGE_FOR_UPDATES = 1; // in Meters
private static final long MINIMUM_TIME_BETWEEN_UPDATES = 1000; // in Milliseconds

protected LocationManager locationManager;

protected Button retrieveLocationButton;

@Override
public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);
setContentView(R.layout.main);


retrieveLocationButton = (Button) findViewById(R.id.retrieve_location_button);

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

locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MINIMUM_TIME_BETWEEN_UPDATES,
MINIMUM_DISTANCE_CHANGE_FOR_UPDATES,
new MyLocationListener()
);

retrieveLocationButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
showCurrentLocation();
}
});

}


protected void showCurrentLocation() {


Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);


if (location != null) {
String message = String.format(
"Current Location n Longitude: %1$s n Latitude: %2$s",
location.getLongitude(), location.getLatitude()
);
Toast.makeText(LbsGeocodingActivity.this, message,
Toast.LENGTH_LONG).show();
}


}


private class MyLocationListener implements LocationListener {


public void onLocationChanged(Location location) {
String message = String.format(
"New Location n Longitude: %1$s n Latitude: %2$s",
location.getLongitude(), location.getLatitude()
);
Toast.makeText(LbsGeocodingActivity.this, message, Toast.LENGTH_LONG).show();
}


public void onStatusChanged(String s, int i, Bundle b) {
Toast.makeText(LbsGeocodingActivity.this, "Provider status changed",
Toast.LENGTH_LONG).show();
}


public void onProviderDisabled(String s) {
Toast.makeText(LbsGeocodingActivity.this,
"Provider disabled by the user. GPS turned off",
Toast.LENGTH_LONG).show();
}


public void onProviderEnabled(String s) {
Toast.makeText(LbsGeocodingActivity.this,
"Provider enabled by the user. GPS turned on",
Toast.LENGTH_LONG).show();
}


}

}



Image


 


Click run button, the emulator started but no GPS location are displayed. We are using DDMS to provide dummy data.


Android ships with a debugging tool called the Dalvik Debug Monitor Server (DDMS), which provides port-forwarding services, screen capture on the device, thread and heap information on the device, logcat, process, and radio state information, incoming call and SMS spoofing, location data spoofing, and more. This page provides a modest discussion of DDMS features; it is not an exhaustive exploration of all the features and capabilities.


How to run DDMS?


Image


 


Running DDMS
DDMS is integrated into Eclipse and is also shipped in the tools/ directory of the SDK. DDMS works with both the emulator and a connected device. If both are connected and running simultaneously, DDMS defaults to the emulator.


From Eclipse: Click Window > Open Perspective > Other... > DDMS.
From the command line: Type ddms (or ./ddms on Mac/Linux) from the tools/ directory.

No comments:

Post a Comment