Android: Show Google Map, Zooming Control And Marker On Map

umesh_map_view.xml : 

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:background="#008000"

    android:orientation="vertical" >

    <com.google.android.maps.MapView

         android:id="@+id/mapView"

        android:layout_width="fill_parent"

        android:layout_height="fill_parent"

        android:enabled="true"

        android:clickable="true"

        android:apiKey="0twJXMQDHBfxjMnb77nwRzKs29kGZdRkcG3_Z8Q" />

    

    <LinearLayout android:id="@+id/zoom" 

        android:layout_width="wrap_content" 

        android:layout_height="wrap_content" 

        android:layout_alignParentBottom="true" 

        android:layout_centerHorizontal="true" 

        /> 

    

</RelativeLayout>

In above xml file, you should generate your own apiKey. For more reference fallow this link : get google map api key

GPSLocation.java :

import java.util.List;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Canvas;

import android.graphics.Point;

import android.os.Bundle;

import com.redorange.c4mh.R;

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.Overlay;

import com.google.android.maps.MapView.LayoutParams;

import android.view.KeyEvent;

import android.view.View;

import android.widget.LinearLayout;

public class GPSLocation extends MapActivity {

MapView mapView;

MapController mc;

GeoPoint p;

public static String latitude,longitude;

/** Called when the activity is first created. */

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.umesh_map_view);

mapView = (MapView) findViewById(R.id.mapView);

mapView.setSatellite(false);

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);

// Show particular location in Mapview

mc = mapView.getController();

   String coordinates[] = {latitude, longitude};

       //String coordinates[] = {"1.352566007", "103.78921587"};

       double lat = Double.parseDouble(coordinates[0]);

       double lng = Double.parseDouble(coordinates[1]);

 

       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();

       

//=====================================

}

@Override

protected boolean isRouteDisplayed() {

return false;

}

// Below is the code when the user presses the number 3 on the keyboard the

// map

// will zoom in into the next level. Pressing number 1 will zoom out one

// level.

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);

}

// ----------------------------------------------------

// Class that point out the perticular location using push pin image

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.pushpin);            

           canvas.drawBitmap(bmp, screenPts.x, screenPts.y-42, null);         

           return true;

       }

   } 

 

}

In above java file, it uses pushpin as an image. You can download it from Google and store it in your drawable folder