Getting location in android!

Below is a demo code for getting location from your android devices.

MainActivity.class

package com.gpsdemo;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;

import android.R.string;
import android.app.Activity;
import android.content.Context;
import android.location.Address;
import android.location.Criteria;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.location.LocationProvider;
import android.os.Bundle;
import android.provider.SyncStateContract.Constants;
import android.util.Log;
import android.view.Menu;
import android.widget.TextView;

public class MainActivity extends Activity {
provider
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        LocationManager locationManager;
        String context = Context.LOCATION_SERVICE;
        locationManager = (LocationManager)getSystemService(context);
        Criteria criteria = new Criteria();
        criteria.setAccuracy(Criteria.ACCURACY_FINE);
        criteria.setAltitudeRequired(false);
        criteria.setBearingRequired(false);
        criteria.setCostAllowed(true);
        criteria.setPowerRequirement(Criteria.POWER_LOW);
        String provider = locationManager.getBestProvider(criteria, true);
        ArrayList<String> a=(ArrayList<String>)locationManager.getProviders(true);
        Location location =locationManager.getLastKnownLocation(provider);
        updateWithNewLocation(location);provider
        locationManager.requestLocationUpdates(provider, 200, 1,locationListener);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
  
    private void updateWithNewLocation(Location location) {
        Log.d("com.gpsdemo","update");
        String latLongString;
        TextView myLocationText;
        myLocationText = (TextView)findViewById(R.id.myLocationText);
        String addressString = "No address found";
        if (location != null) {
        double lat = location.getLatitude();
        double lng = location.getLongitude();
        latLongString = "Lat:" + lat + "\nLong:" + lng;
        double latitude = location.getLatitude();
        double longitude = location.getLongitude();
        Geocoder gc = new Geocoder(this, Locale.getDefault());
        try {
        List<Address> addresses = gc.getFromLocation(latitude, longitude, 1);
        StringBuilder sb = new StringBuilder();
        if (addresses.size() > 0) {
        Address address = addresses.get(0);
        for (int i = 0; i < address.getMaxAddressLineIndex(); i++)
        sb.append(address.getAddressLine(i)).append("\n");
        sb.append(address.getLocality()).append("\n");
        sb.append(address.getPostalCode()).append("\n");
        sb.append(address.getCountryName());
        }
        addressString = sb.toString();
        } catch (IOException e) {}
        } else {
        latLongString = "No location found";
        }
        myLocationText.setText("Your Current Position is:\n" +
        latLongString);
        }
    private LocationListener locationListener = new LocationListener() {
        public void onLocationChanged(Location location) {
            Log.d("com.gpsdemo","update");
        updateWithNewLocation(location);
        }
        public void onProviderDisabled(String provider){
        updateWithNewLocation(null);
        }provider
        public void onProviderEnabled(String provider){ }
        public void onStatusChanged(String provider, int status,
        Bundle extras){ }
        };
}

activity_main.xml

<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:id="@+id/myLocationText"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@+string/hello"
/>
</LinearLayout>








AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.gpsdemo"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />

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

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.gpsdemo.MainActivity"
            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>

</manifest>

Problems Encountered:

1) object of provider was null.
    Location provider were off.You can activate them in location and service of settings in your tablet/phone.
2)location object was null.
    gps network was not coming in basement go outside it will work like a charm.

Posted in: Android, GPS, Programming