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I am currently developing a tracking system to plot out the user's movement trajectory inside a room or whaterever. Now i have managed to import my map into the app and the map is free to be zoomed and moved. The next step is to place a marker to indicate the user location on the map and move the mark around OVER the map. (like floating on the map) I read it somewhere and think this may be done with MyLocationOverlay , but most of the examples online are all to apply it onto the google map . However, in my case, my map is not google map , it is my OWN map . (The map can be the map of my room or even a map that I draw myself!) I have done the tracking algorithm, i.e. I know where to place my marker image . So the only question remains is how to present the marker image on top of the map image. In details, I have a self-defined view, MapView, as follows: package com.example.drsystem; import android.content.Context; import android.graphics.Canvas; import android.graphics.drawable.Drawable; import android.util.AttributeSet; import android.util.Log; import android.view.MotionEvent; import android.view.ScaleGestureDetector; import android.view.View; public class MapView extends View { private static final int INVALID_POINTER_ID = -1; private Drawable mImage; private float mPosX; private float mPosY; private float mLastTouchX; private float mLastTouchY; private int mActivePointerId = INVALID_POINTER_ID; private ScaleGestureDetector mScaleDetector; private float mScaleFactor = 1.f; public MapView(Context context) { this(context, null, 0); mImage = getResources().getDrawable(R.drawable.lv12n); mImage.setBounds(0, 0, mImage.getIntrinsicWidth(), mImage.getIntrinsicHeight()); } // called when XML tries to inflate this View public MapView(Context conte

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