[android-developers] Help with Displaying Overlay

[Francesca Trinidad]

I'm a beginner at Android programming. I want to display to GeoPoints
that I've hardcoded in my app. But I still don't see them when I run
the app on my emulator. Help is appreciated.

Main.java
package com.rcm.mflwa;

import java.util.List;

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.MyLocationOverlay;
import com.google.android.maps.Overlay;
import com.google.android.maps.OverlayItem;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.MotionEvent;

public class Main extends MapActivity {

        /**private MyOverlay myOverlay;
        private MapView mapView;
        private List<Overlay> mapOverlays;

        @Override
        public void onCreate(Bundle sis){
                super.onCreate(sis);
                setContentView(R.layout.main); // in my main.xml I defined a
MapView
                mapView = (MapView) findViewById(R.id.mvMain);
                mapOverlays = mapView.getOverlays();
                myOverlay = new MyOverlay(mapView);
                mapOverlays.add(myOverlay);
            }

        @Override
        protected boolean isRouteDisplayed() {
                // TODO Auto-generated method stub
                return false;
        }*/
    /** Called when the activity is first created. */
    MapView map;
        long start;
        long stop;
        GeoPoint touchedPoint;
        MyLocationOverlay compass;
        MapController controller;
        Drawable d;
         List<Overlay> overlayList;
        List<Overlay> mapOverlays;
        MyOverlay myOverlay;

        @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        map = (MapView)findViewById(R.id.mvMain);
        map.setBuiltInZoomControls(true);
        mapOverlays = map.getOverlays();
        myOverlay = new MyOverlay(map);
        mapOverlays.add(myOverlay);

        overlayList = map.getOverlays();
        compass = new MyLocationOverlay(Main.this, map);
        overlayList.add(compass);
        controller = map.getController();
        int lat = (int) (14*1E6);
        int lon = (int) (121*1E6);
        GeoPoint point = new GeoPoint(lat, lon);
        controller.animateTo(point);
        controller.setZoom(6);
        d = getResources().getDrawable(R.drawable.ic_launcher);
    }

        @Override
        protected void onPause() {
                // TODO Auto-generated method stub
                compass.disableCompass();
                super.onPause();
        }

        @Override
        protected void onResume() {
                // TODO Auto-generated method stub
                compass.enableCompass();
                super.onResume();
        }

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

}

MyOverlay.java

package com.rcm.mflwa;

import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Point;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;
import com.google.android.maps.Projection;

public class MyOverlay extends Overlay {
    private GeoPoint geoPoint1;
    private GeoPoint geoPoint2;
    private Point point1;
    private Point point2;
    private Projection projection;
    private Paint paint;
    private Path path;

    public MyOverlay(MapView mapView){
        projection = mapView.getProjection();
    }

    public void draw(Canvas canvas, MapView mapView, boolean shadow){
        super.draw(canvas, mapView, shadow);
        paint = new Paint();
        paint.setDither(true);
        paint.setColor(Color.BLUE);
        paint.setStyle(Paint.Style.FILL_AND_STROKE);
        paint.setStrokeJoin(Paint.Join.ROUND);
        paint.setStrokeCap(Paint.Cap.ROUND);
        paint.setStrokeWidth(2);

        point1 = new Point();
        point2 = new Point();
        path = new Path();

        int lat1 = (int) (14*1E6);
        int lon1 = (int) (121*1E6);
        int lat2 = (int) (20*1E6);
        int lon2 = (int) (130*1E6);

        geoPoint1 = new GeoPoint(lat1, lon1);
        geoPoint2 = new GeoPoint(lat2, lon2);

        projection.toPixels(geoPoint1, point1);
        projection.toPixels(geoPoint2, point2);

        path.moveTo(point2.x, point2.y);
        path.moveTo(point1.x, point1.y);

        canvas.drawPath(path, paint);
    }
}

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