Easy drawing current location and compass on the MapView, using MyLocationOverlay.

Easy drawing current location and compass on the MapView, using MyLocationOverlay.

com.google.android.maps provide a usefull classMyLocationOverlay to draw current location (and also compass) on the Map.



To use MyLocationOverlay is simply:

• add a object of MyLocationOverlay in your mapView Overlays
• call enableMyLocation() and/or enableCompass() in onResume()
• call disableMyLocation() and/or disableCompass() onPause()
• add "android.permission.ACCESS_FINE_LOCATION" in AndroidManifest.xml

The main.xml and MyItemizedOverlay.java have no change, you can copy the code from previous post Using ItemizedOverlay to add marker on MapView.

AndroidMapViewActivity.java

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package com.AndroidMapView;   import com.google.android.maps.GeoPoint; import com.google.android.maps.MapActivity; import com.google.android.maps.MapView; import com.google.android.maps.MyLocationOverlay;   import android.graphics.drawable.Drawable; import android.os.Bundle;   public class AndroidMapViewActivity extends MapActivity {     MyItemizedOverlay myItemizedOverlay = null;  MyLocationOverlay myLocationOverlay = null;       /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        MapView mapView = (MapView) findViewById(R.id.mapview);        mapView.setBuiltInZoomControls(true);                Drawable marker=getResources().getDrawable(android.R.drawable.star_big_on);        int markerWidth = marker.getIntrinsicWidth();        int markerHeight = marker.getIntrinsicHeight();        marker.setBounds(0, markerHeight, markerWidth, 0);                myItemizedOverlay = new MyItemizedOverlay(marker);        mapView.getOverlays().add(myItemizedOverlay);                GeoPoint myPoint1 = new GeoPoint(0*1000000, 0*1000000);        myItemizedOverlay.addItem(myPoint1, "myPoint1", "myPoint1");        GeoPoint myPoint2 = new GeoPoint(50*1000000, 50*1000000);        myItemizedOverlay.addItem(myPoint2, "myPoint2", "myPoint2");                myLocationOverlay = new MyLocationOverlay(this, mapView);        mapView.getOverlays().add(myLocationOverlay);        mapView.postInvalidate();      }    @Override  protected boolean isLocationDisplayed() {   // TODO Auto-generated method stub   return false;  }    @Override  protected boolean isRouteDisplayed() {   // TODO Auto-generated method stub   return false;  }    @Override  protected void onResume() {   // TODO Auto-generated method stub   super.onResume();   myLocationOverlay.enableMyLocation();   myLocationOverlay.enableCompass();  }    @Override  protected void onPause() {   // TODO Auto-generated method stub   super.onPause();   myLocationOverlay.disableMyLocation();   myLocationOverlay.disableCompass();  } } akm www.cdacians.com