Android ScrollView doesn't start at top, but at the beginning of the GridView

Question

I have a problem with a ScrollView that has inside of it a personalized GridView and other tipe of views.The first time I start the Activity, the ScrollView starts at its top, but if I visit the Activity other times the ScrollView starts at the beginning of the GridView.I used the class ExpandableHeightGridView found in this link for my GridView. The xml code for the Activity layout is this one:

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/scrollViewLuogo"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#fff" >

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#fff" >

    <LinearLayout
        android:id="@+id/linearLayout2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >

        <ImageView
            android:id="@+id/imageView1"
            android:layout_width="150dp"
            android:layout_height="100dp"
            android:layout_marginLeft="14dp"
            android:layout_marginRight="10dp"
            android:layout_marginTop="10dp"
            android:adjustViewBounds="true"
            android:maxHeight="200dp"
            android:maxWidth="200dp"
            android:scaleType="fitXY"
            android:src="@android:drawable/ic_menu_gallery" />

        <LinearLayout
            android:id="@+id/linearLayout1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:orientation="vertical" >

            <TextView
                android:id="@+id/nomeTVActivityLuogo"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textStyle="bold"
                android:textSize="17sp"
                android:textColor="#005788" />

            <TextView
                android:id="@+id/indirizzoTVActivityLuogo"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />
        </LinearLayout>
    </LinearLayout>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/linearLayout2"
        android:layout_marginTop="10dp"
        android:orientation="vertical" >

        <ImageView
            android:id="@+id/imageViewMappaLuogo"
            android:layout_width="wrap_content"
            android:layout_height="60dp"
            android:layout_marginBottom="10dp"
            android:layout_marginLeft="14dp"
            android:layout_marginRight="14dp"
            android:layout_marginTop="5dp"
            android:scaleType="fitXY"
            android:src="@drawable/sfondo_mappa" />

        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="14dp"
            android:text="Immagini"
            android:textColor="#97d6f9" />

        <View
            android:layout_width="fill_parent"
            android:layout_height="2dp"
            android:layout_marginLeft="14dp"
            android:layout_marginRight="14dp"
            android:layout_marginTop="5dp"
            android:background="#97d6f9" />

        <com.example.mappine.ExpandableHeightGridView
            android:id="@+id/gridViewLuogo"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_marginBottom="10dp"
            android:layout_marginLeft="10dp"
            android:layout_marginRight="10dp"
            android:layout_marginTop="10dp"
            android:numColumns="3" >
        </com.example.mappine.ExpandableHeightGridView>

    </LinearLayout>

</RelativeLayout>

I've tried using the code scrollView.fullScroll(ScrollView.FOCUS_UP); but it didn't work.And even with scrollView.scrollTo(0, 0); I didn't have success. The only code that worked was:

    scrollView.post(new Runnable() 
      { 
         public void run() { 
             scrollViewLuogo.fullScroll(ScrollView.FOCUS_UP); 
         } 
      });

but it makes a fast animation from the top of the GridView to the top of the screen and i don't like it.

Any suggestion??

Answer 1

Solution:

Ok sorry if it is a late reply but I stumbled upon the same issue (only that I was using ListView instead) and with a bit of trial and error I found the solution to this:

Basically the problem lies in the fact that the GridView/ListView child automatically requests parent focus (ScrollView) when you "hack" and resize its content with ExpandableHeightGridView, which happens after layout is rendered, and hence you see that animation when trying to scroll it up with scrollTo() (happens AFTER layout is created and AFTER gridView is resized so any generic callback is useless to handle this programatically).

So then, the simplest solution I found was to simply disable focusable property on the ListView/GridView with:

listView.setFocusable(false);

That way when you first enter the activity, focus will default and not rely on Listview/GridView.

And all working fine =)