FixedMyLocationOverlay.java

package com.markupartist.sthlmtraveling.graphics;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.Paint.Style;
import android.graphics.drawable.Drawable;
import android.location.Location;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapView;
import com.google.android.maps.MyLocationOverlay;
import com.google.android.maps.Projection;
import com.markupartist.sthlmtraveling.R;

/**
 * From the Android Developers group.
 * http://groups.google.com/group/android-developers/msg/6cb65da690614662
 * 
 * This class is a workaround for the MyLocationOverlay, that crashes on
 * some devices, in my case I got reports from a Spica device.
 */
public class FixedMyLocationOverlay extends MyLocationOverlay {
    private boolean bugged = false;
    private Paint accuracyPaint;
    private Point center;
    private Point left;
    private Drawable drawable;
    private int width;
    private int height;

    public FixedMyLocationOverlay(Context context, MapView mapView) {
        super(context, mapView);
    }

    @Override
    protected void drawMyLocation(Canvas canvas, MapView mapView,
            Location lastFix, GeoPoint myLoc, long when) {
        if (!bugged) {
            try {
                super.drawMyLocation(canvas, mapView, lastFix, myLoc, when);
            } catch (Exception e) {
                bugged = true;
            }
        }
        if (bugged) {
            if (drawable == null) {
                accuracyPaint = new Paint();
                accuracyPaint.setAntiAlias(true);
                accuracyPaint.setStrokeWidth(2.0f);
                drawable = mapView.getContext().getResources().getDrawable(
                        R.drawable.my_location_bugged);
                width = drawable.getIntrinsicWidth();
                height = drawable.getIntrinsicHeight();
                center = new Point();
                left = new Point();
            }
            Projection projection = mapView.getProjection();
            double latitude = lastFix.getLatitude();
            double longitude = lastFix.getLongitude();
            float accuracy = lastFix.getAccuracy();
            float[] result = new float[1];
            Location.distanceBetween(latitude, longitude, latitude,
                    longitude + 1, result);
            float longitudeLineDistance = result[0];
            GeoPoint leftGeo = new GeoPoint(
                    (int) (latitude * 1e6),
                    (int) ((longitude - accuracy / longitudeLineDistance) * 1e6));
            projection.toPixels(leftGeo, left);
            projection.toPixels(myLoc, center);
            int radius = center.x - left.x;
            accuracyPaint.setColor(0xff6666ff);
            accuracyPaint.setStyle(Style.STROKE);
            canvas.drawCircle(center.x, center.y, radius, accuracyPaint);
            accuracyPaint.setColor(0x186666ff);
            accuracyPaint.setStyle(Style.FILL);
            canvas.drawCircle(center.x, center.y, radius, accuracyPaint);
            drawable.setBounds(center.x - width / 2, center.y - height / 2,
                    center.x + width / 2, center.y + height / 2);
            drawable.draw(canvas);
        }
    }
}