Android : Transparent Actiobar in android

I am trying to give transparent effect to my action bar. I have used the following line to make it work that way, but strangely on my Nexus 5 I am can see the bar coming, but on my galaxy nexus I don't see it at all.

I am not sure why this is coming up on N5? How to solve this issue?

Here is the code:

    getWindow().requestFeature(Window.FEATURE_ACTION_BAR_OVERLAY);
    getActionBar().setDisplayHomeAsUpEnabled(true);
    getActionBar().setDisplayShowHomeEnabled(false);
    ActionBar actionBar = getActionBar();
    actionBar.setBackgroundDrawable(new ColorDrawable(android.graphics.Color.TRANSPARENT));
    actionBar.setStackedBackgroundDrawable(new ColorDrawable(android.graphics.Color.TRANSPARENT));
    setContentView(R.layout.profile);

Here is the screenshot for both Galaxy nexus running Jelly Bean (4.3) and Nexus 5 running kitkat (4.4.4)

Galaxy Nexus: showing transparent action bar perfectly:

Nexus 5: showing transparent action bar: (A horizontal line is shown)