AndroidのScrollViewの中のGridViewのlayout_heightが伸び縮みしないのを独自Viewで克服

ExpandableHeightGridView.java

package xx.xxx.xx.view;

import android.content.Context;
import android.util.AttributeSet;
import android.view.ViewGroup;
import android.widget.GridView;

/**
 * ScrollViewの中のGridViewでも高さを可変にする<br>
 * http://stackoverflow.com/questions/8481844/gridview-height-gets-cut
 */
public class ExpandableHeightGridView extends GridView
{

    boolean expanded = false;

    public ExpandableHeightGridView(Context context)
    {
        super(context);
    }

    public ExpandableHeightGridView(Context context, AttributeSet attrs)
    {
        super(context, attrs);
    }

    public ExpandableHeightGridView(Context context, AttributeSet attrs,
            int defStyle)
    {
        super(context, attrs, defStyle);
    }

    public boolean isExpanded()
    {
        return expanded;
    }

    @Override
    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
    {
        // HACK! TAKE THAT ANDROID!
        if (isExpanded())
        {
            // Calculate entire height by providing a very large height hint.
            // View.MEASURED_SIZE_MASK represents the largest height possible.
            int expandSpec = MeasureSpec.makeMeasureSpec(MEASURED_SIZE_MASK,
                    MeasureSpec.AT_MOST);
            super.onMeasure(widthMeasureSpec, expandSpec);

            ViewGroup.LayoutParams params = getLayoutParams();
            params.height = getMeasuredHeight();
        }
        else
        {
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        }
    }

    public void setExpanded(boolean expanded)
    {
        this.expanded = expanded;
    }
}

gistfile1.xml

            <ScrollView
                android:id="@+id/sc_spots"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:fillViewport="true" >


                        <xx.xxx.xx.view.ExpandableHeightGridView
                            android:id="@+id/spotsView"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_marginTop="15dp"
                            android:layout_marginBottom="15dp"
                            android:layout_marginLeft="5dp"
                            android:layout_marginRight="5dp"
                            android:horizontalSpacing="10dp"
                            android:isScrollContainer="false"
                            android:numColumns="5"
                            android:stretchMode="columnWidth"
                            android:verticalSpacing="10dp" />
            </ScrollView>

gistfile2.java

        mGridView = (ExpandableHeightGridView) getView().findViewById(R.id.spotsView);
        mGridView.setExpanded(true);
        SpotsAdapter adapter = new SpotsAdapter(getActivity(), R.layout.spot_item,params);
        mGridView.setAdapter(adapter);
        adapter.notifyDataSetChanged();

The problem is that You must set allways the LayoutParams as a parent of children is.
Example:

CardView inside LinearLayout should call setLayoutParams(new LinearLayout.LayoutParams(...))
Thats logic, right?
try to override function with instanceof, example :
if(getLayoutParams() != null) && (getLayoutParams() instanceof LinearLayoutParams) { ... }
I know this is most ugliest code, say thanx to private & final properties & methods of google team

I'm having trouble with this view on Kindle Fire. On my regular Android device, I can see the whole grid view, but on Kindle Fire, the bottom 5-10% gets clipped off, and I can't scroll further to see it all. I imagine this is a difference in screen measuring, but I don't know enough about it to figure out how to fix it. Any ideas?

I am getting null pointer exception :Attempt to invoke virtual method 'void ExpandableHeightGridView.setExpanded(boolean)' on a null object reference.
Please help.

any solution for onscroll change listener.