Thursday 12 April 2012

GPS Tracker / Location GPS / Find Location Using GPS

HI Folks,

I am posting a ANDROID code for finding GPS latitude & longitude & offcourse with IMAGES it ll show you the addresses which you have specified.

Here are the steps for finding location Image of an GPS.

First create the main_activity class in your project.
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import android.app.Activity;
import android.content.Intent;

import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener{
    EditText address;
    EditText state;

    EditText country;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);

        setContentView(R.layout.pre_main);
        findViewById(R.id.get).setOnClickListener(this);

        address = (EditText)findViewById(R.id.enterAddress);
        state = (EditText)findViewById(R.id.enterState);
        country = (EditText)findViewById(R.id.enterCountry);

    }

    public void onClick(View v)  
    {
        String addressString = address.getText().toString().trim();
        String stateString = state.getText().toString().trim();
        String countryString = country.getText().toString().trim();

        if(isValidAddress(addressString, stateString, countryString))
        {   
            Intent i = new Intent(this, GPSActivity.class);
            i.putExtra("address", addressString + " "+ stateString +" "+countryString);
            startActivity(i);

        }
        else
        {
            Toast.makeText(getApplicationContext(), "Please provide valid address",                       Toast.LENGTH_LONG).show();
        }

    }

    private boolean isValidAddress(String addressString, String stateString, String countryString)
    {
        if(addressString.length() < 1 && stateString.length() < 1 && countryString.length() < 1)
        {
            return false;
        }
        else
        {
            return true;
        }

    }
}

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Create the main.XML file 


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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:layout_gravity="center"
    android:background="#ffffff">

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="70dp"
        android:background="@drawable/map_icon"
        android:layout_gravity="center"
        android:padding="20dp"
        android:textColor="#ffffff"
        android:layout_marginBottom="10dp"
        android:layout_marginTop="5dp"/>

    <EditText
        android:id="@+id/enterAddress"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:hint="Enter address "
        android:singleLine="true"
        android:layout_margin="5dp"/>      
   

    <EditText
        android:id="@+id/enterState"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:hint="Enter State "
        android:singleLine="true"
        android:layout_margin="5dp"/>

    <EditText
        android:id="@+id/enterCountry"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:hint="Enter Country"
        android:singleLine="true"
        android:layout_margin="5dp"/>

    <Button
        android:id="@+id/get"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="Show Map"
        android:layout_margin="5dp"/>

</LinearLayout>


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for GPSActivity create WebView.xml
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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

  

        <com.google.android.maps.MapView
            android:id="@+id/mapView"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:apiKey="00LAWIUYnasETyS-tTjYOv5v8KQz8vvmAEEsFQw"
            android:clickable="true"
            android:enabled="true" />

        <LinearLayout
            android:id="@+id/zoom"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_centerHorizontal="true" />
   

</LinearLayout>

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Now Create GPSActivity activity.

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import java.io.IOException;
import java.util.List;
import java.util.Locale;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import com.google.android.maps.MapView.LayoutParams; 
import com.google.android.maps.Overlay;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Point;
import android.location.Address;
import android.location.Geocoder;
import android.net.Uri;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.Toast;

public class TestGPSActivity extends MapActivity
{   
    MapView mapView;
    private MapController mc;
    private GeoPoint p;
    private double lng;
    private double lat;
    private Address address;

    class MapOverlay extends com.google.android.maps.Overlay
    {
        @Override
        public boolean draw(Canvas canvas, MapView mapView,
                boolean shadow, long when)
        {
            super.draw(canvas, mapView, shadow);                  

            //---translate the GeoPoint to screen pixels---
            Point screenPts = new Point();
            mapView.getProjection().toPixels(p, screenPts);

            //---add the marker---
            Bitmap bmp = BitmapFactory.decodeResource(
                    getResources(), R.drawable.pin);           
            canvas.drawBitmap(bmp, screenPts.x, screenPts.y-50, null);        
            return true;
        }
    }
    public boolean onTouchEvent(MotionEvent event, MapView mapView)
    {  
        //---when user lifts his finger---
        if (event.getAction() == 1) {               
            GeoPoint p = mapView.getProjection().fromPixels(
                    (int) event.getX(),
                    (int) event.getY());

            Geocoder geoCoder = new Geocoder(
                    getBaseContext(), Locale.getDefault());
            try {
                List<Address> addresses = geoCoder.getFromLocation(
                        p.getLatitudeE6()  / 1E6,
                        p.getLongitudeE6() / 1E6, 1);

                String add = "";
                if (addresses.size() > 0)
                {
                    for (int i=0; i<addresses.get(0).getMaxAddressLineIndex();
                            i++)
                        add += addresses.get(0).getAddressLine(i) + "\n";
                }

                Toast.makeText(getBaseContext(), add, Toast.LENGTH_LONG).show();
            }
            catch (IOException e) {               
                e.printStackTrace();
            }  
            return true;
        }
        else               
            return false;
    }     


    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);


        mapView = (MapView) findViewById(R.id.mapView);
        LinearLayout zoomLayout = (LinearLayout)findViewById(R.id.zoom); 
        View zoomView = mapView.getZoomControls();

       
        zoomLayout.addView(zoomView,
                new LinearLayout.LayoutParams(
                        LayoutParams.WRAP_CONTENT,
                        LayoutParams.WRAP_CONTENT));
        mapView.displayZoomControls(true);

        mc = mapView.getController();
   
        Geocoder geocoder = new Geocoder(this, Locale.getDefault());
        List<Address> addresses = null;
        try {           
            addresses = geocoder.getFromLocationName(getIntent().getStringExtra("address"), 1);       
        } catch (IOException e) {
        }
       
        try{  address = addresses.get(0); 
        }catch (Exception e) {           
            flash("Unable to locate given address");
            finish();
        }
        try{
          lng  = address.getLongitude();
          lat  = address.getLatitude();  
        }catch (Exception e) {           
        }       

        p = new GeoPoint((int) (lat * 1E6), (int) (lng * 1E6));
        mc.animateTo(p);
        mc.setZoom(17);
   
        //---Add a location marker---
        MapOverlay mapOverlay = new MapOverlay();
        List<Overlay> listOfOverlays = mapView.getOverlays();
        listOfOverlays.clear();
        listOfOverlays.add(mapOverlay);       
       
        mapView.invalidate();
        mapView.invalidate();
       
    }

   private void writeIntoFile(String string) {

        FileWriter fw = null;
        try {
            fw = new FileWriter("/sdcard/map_log.txt", true);
            BufferedWriter br =  new BufferedWriter(fw);
            br.append("--> "+string+"\n");
            br.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    private void flash(String data) {  
        Toast.makeText(getApplicationContext(), data, Toast.LENGTH_LONG).show();
    }

    @Override
    protected boolean isRouteDisplayed() {
        // TODO Auto-generated method stub   
        return false;
    }

    public boolean onKeyDown(int keyCode, KeyEvent event)
    {
        MapController mc = mapView.getController();
        switch (keyCode)
        {
        case KeyEvent.KEYCODE_3:
            mc.zoomIn();
            break;
        case KeyEvent.KEYCODE_1:
            mc.zoomOut();
            break;
        }
        return super.onKeyDown(keyCode, event);
    }   
}


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here is the android.manifest for GPS activity
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 <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.your_package_name.GPS"
    android:versionCode="1"
    android:versionName="1.0" >

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

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

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".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>
        <activity android:name=".GPSActivity" > 
        </activity>

        <uses-library android:name="com.google.android.maps" />
    </application>

</manifest>

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don't forget to give INTERNET permission 

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Don't forget to upload com.google.android.maps.jar lib file which you will get from google map websites.

This project will not work on emulator sometimes . So better test it on device.

Hope this ll get help for some beginners in android.

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Thanks & Regards
Rahul Baradia 

Enjoy life without worries.
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