title: what is difference b/w View.GONE and View.INVISIBLE
body: <p>I am using a Custom View. 
    On the Custom View I am plotting some Graph. And also I am using TextView on my layout. When I am making this TextView VISIBLE and INVISIBLE on button click
  , it is clearing graph.Why  it is clearing  graph with both GONE and INVISIBLE? </p>
  
  <p>Any Idea? </p>