Pharmacies/src/org/r3pek/pharmacies/MyPositionOverlay.java

package org.r3pek.pharmacies;

import java.util.Timer;
import java.util.TimerTask;

import org.r3pek.pharmacies.utils.GeoUtils;
import org.r3pek.pharmacies.utils.GlobalVars;
import org.r3pek.pharmacies.utils.OnPositionChangeListener;

import android.app.Activity;
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.graphics.drawable.LevelListDrawable;
import android.os.Handler;
import android.os.Message;
import android.os.Handler.Callback;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;

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

public class MyPositionOverlay extends Overlay implements OnPositionChangeListener {
	private static final float dotScale = 0.6f;
	private MapView map;
	private Runnable runOnFirstFix;
	private boolean isFirstFix;
	private LevelListDrawable netLocationImage;
	private LevelListDrawable gpsLocationImage;
	private Timer updateDotTask;
	private Context context;
	private View shownView;
	private Activity mapActivity;

	public MyPositionOverlay(Context ctx, MapView mapView, Activity mapActivity) {
		super();
		map = mapView;
		this.mapActivity = mapActivity; 
		GlobalVars.positioner.registerNotification(this);
		isFirstFix = true;
		context = ctx;
       	netLocationImage = (LevelListDrawable) ctx.getResources().getDrawable(R.drawable.network_fix);
       	gpsLocationImage = (LevelListDrawable) ctx.getResources().getDrawable(R.drawable.gps_fix);
       	
       	updateDotTask = new Timer();
       	TimerTask tt = new TimerTask() {
			@Override
			public void run() {
				if (GlobalVars.positioner.isGPSFix()) return;
				int current = netLocationImage.getLevel();
				current = (current + 1) % 4;
				netLocationImage.setLevel(current);
				map.postInvalidate();
			}
		};
		updateDotTask.scheduleAtFixedRate(tt, 100, 500);
	}
	
	@Override
	public void draw(Canvas canvas, MapView mapView, boolean shadow) {
		if (shadow || isFirstFix) return;
        if (GlobalVars.positioner.getLastGeoPoint() == null) return;

        Projection projection = mapView.getProjection();
        Point point = new Point();
        projection.toPixels(GlobalVars.positioner.getLastGeoPoint(), point);

        // Draw the accuracy circle
        float radius = projection.metersToEquatorPixels(GlobalVars.positioner.getLastAccuracy());
        canvas.save();
        Paint circlePaint = new Paint();
        circlePaint.setStyle(Style.FILL);
        circlePaint.setARGB(10, 0, 0, 255);
        canvas.drawCircle(point.x, point.y, radius, circlePaint);
        circlePaint.setARGB(200, 0, 0, 255);
        circlePaint.setStyle(Style.STROKE);
        canvas.drawCircle(point.x, point.y, radius, circlePaint);
        canvas.restore();

        // Draw in the right spot
        Drawable d = GlobalVars.positioner.isGPSFix() ? gpsLocationImage.getCurrent() : netLocationImage.getCurrent();
        int scaledImageWidth =  (int)(d.getIntrinsicWidth() * dotScale);
        int scaledImageHeight =  (int)(d.getIntrinsicHeight() * dotScale);
        float scaledImageCenterX = scaledImageWidth / 2;
        float scaledImageCenterY = scaledImageHeight / 2;

        canvas.save();
        canvas.translate(-(scaledImageCenterX - point.x), -(scaledImageCenterY - point.y));
        d.setBounds(0, 0, scaledImageWidth, scaledImageHeight);
        d.getCurrent().draw(canvas);
        canvas.restore();

        super.draw(canvas, mapView, shadow);
	}
	
	@Override
	public void onLocationChange(GeoPoint currentPos, float accuracy) {
		if (isFirstFix) {
			isFirstFix = false;
			runOnFirstFix.run();
		}
		map.postInvalidate();
	}
	
	public void disableMyLocation() {
		GlobalVars.positioner.unregisterNotification(this);
	}
	
	public void enableMyLocation() {
		GlobalVars.positioner.registerNotification(this);
	}
	
	public void runOnFirstFix(Runnable r) {
		runOnFirstFix = r;
	}
	
	@Override
	public boolean onTap(GeoPoint p, MapView map) {
		Point pointTap = map.getProjection().toPixels(p, null);
		Point pointMap = map.getProjection().toPixels(GlobalVars.positioner.getLastGeoPoint(), null);
		if (Math.abs(pointTap.x - pointMap.x) <= 20 && Math.abs(pointMap.y - pointTap.y) <= 20 && shownView == null) {
			LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
			LinearLayout ll = (LinearLayout)inflater.inflate(R.layout.mylocation_balloon, null);
			LayoutParams lp = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT, GlobalVars.positioner.getLastGeoPoint(), 0, -35, LayoutParams.MODE_MAP | LayoutParams.CENTER);
			
			final TextView tvLocation = (TextView)ll.findViewById(R.id.tvLocation);
			tvLocation.setText(context.getString(R.string.loading));
			map.getController().animateTo(GlobalVars.positioner.getLastGeoPoint());
			map.addView(ll, lp);
			shownView = ll;
			GeoUtils.getLocationName(context, new Handler(new Callback() {
				@Override
				public boolean handleMessage(Message msg) {
					final String location = msg.getData().getString("location");
						mapActivity.runOnUiThread(new Runnable() {
							@Override
							public void run() {
								tvLocation.setText(location);
							}
						});
						return true;
					}
				}));
		} else if (shownView != null) {
			map.removeView(shownView);
			shownView = null;
		}
        return super.onTap(p, map);
	}

}