Call a method to refresh the Overlays on MapActivity from another Activity
<p>I want to refresh the overlays on my MapActivity through a click of a button on another Activity. How should I call the method?</p>

<p>I call this following method on the activity actually, but it doesn't work:</p>

<pre><code>@Override
    public void onClick(View v) {
    switch (v.getId()) {
            case R.id.btn_nav_back:
                WWHApplication.getMapActivityIntance().mapInvalidate();
                finish();
                break;
</code></pre>

<p>this is the mapInvalidate() method inside the MapActivity</p>

<pre><code>public void mapInvalidate(){
    mapView.postInvalidate();
}
</code></pre>

<p>Thank you.</p>
