ScrollView Overlaps Toolbar

Try:

<LinearLayout>

    <Toolbar 
        android:layout_width="match_parent"
        android:layout_height="wrap_content" /> 

    <ScrollView 
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

</LinearLayout>

This way the LinearLayout is going to firstly compute the dimension of the toolbar, because it has no layout_weight attributes, and lay it down. Then it assigns all the remaining space to the ScrollView.

Apparently the problem wasn't overlapping Toolbar with ScrollView, but rather was with ScrollView itself. The problem was arrising from gravity of the only child on ScrollView, so removing gravity from LinearLayout inside ScrollView and the problem was solved. It seems like a bug to me maybe I should contact google and let them know 'bout this.

i solved this by place toolbar and scroll view in relative layout, then give "android:layout_below="@+id/bar" " in scroll view..

just like this:

<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="match_parent">

<android.support.design.widget.AppBarLayout
    android:id="@+id/bar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize" />

</android.support.design.widget.AppBarLayout>

<ScrollView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_below="@+id/bar"
    android:paddingTop="20dp"
    android:layout_gravity="center">

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="match_parent"/></ScrollView></RelativeLayout>