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

com.google.android.maps provide a usefull class MyLocationOverlay 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

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();
 } 
}

AndroidManifest.xml, "android.permission.INTERNET" and "android.permission.ACCESS_FINE_LOCATION" is needed.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.AndroidMapView"
     android:versionCode="1"
     android:versionName="1.0">
   <uses-sdk android:minSdkVersion="4" />
   <application android:icon="@drawable/icon" android:label="@string/app_name">
    <uses-library android:name="com.google.android.maps" />
       <activity android:name=".AndroidMapViewActivity"
                 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>
 <uses-permission android:name="android.permission.INTERNET"/>
 <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>
</manifest>

related: Implement own Custom MapView to move the routine works inside MapView.