Add/Remove View on the Top of Activity or Fragment Android

Add view on to the top of your activity or fragment i.e. in simple to add custom view above the AppCompact/Support Toolbar.

FrameLayout rootLayout = (FrameLayout) findViewById (android.R.id.content);
View v = View.inflate(this, R.layout.overlay_layout, rootLayout);

Then when you want to remove it, below use the below code snippet

FrameLayout rootLayout = (FrameLayout)findViewById(android.R.id.content);
rootLayout.removeViewAt(rootLayout.getChildCount()-1);

Happy Coding :-)