android.support.v7.app.ActionBar actionBar = getSupportActionBar();
actionBar.setBackgroundDrawable(new ColorDrawable(getColor(R.color.colorVelocity)));   **//<<Error NullPointerException**

android.support.v7.app.ActionBar actionBar = getSupportActionBar();
if (actionBar != null) {
  actionBar.setBackgroundDrawable(new ColorDrawable(getColor(R.color.colorVelocity)));
}