how to change parent view's height to fit child view

Question

I have one relative view that contains one listview. I am creating this relative view on run time and add contents (basically an string array) to my list view. I have set the listview width and height to "wrap_content". The problem is my list parent relative view is not resizing to show my listview. it just shows first value of the list . I understand I have to override onmeasure method. So, how exactly can I get the height of my listview in onmeasure method so i can pass it to my parent view I have read many problems like this but couldn't get it working.

One more thing getMeasuredHeight() returns 0 in my onmeasure() method.

Update

my main layout activity_main

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/layout_route_search"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<RelativeLayout
    android:id="@+id/layout_main"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >
</RelativeLayout>

</ScrollView>

lo_block.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="Text_view" />

<ListView
    android:id="@+id/listView1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

</RelativeLayout>

here is my code
Frag.java

public class Frag extends Fragment {

private View mView;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    mView = inflater.inflate(R.layout.activity_main, null);

    showView();
    return mView;
}

public void showView() {

    block card = new block(getActivity());

    LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT,
            LayoutParams.WRAP_CONTENT);

    card.setLayoutParams(params);
    ViewGroup vg = (ViewGroup) mView.findViewById(R.id.layout_main);
    vg.addView(card);
}

private class block extends RelativeLayout {

// int listViewh = 0; // private float listViewHeight;

    public block(Context context) {
        super(context);

        View mView = View.inflate(getContext(), R.layout.lo_block, this);

        ListView lst = (ListView) mView.findViewById(R.id.listView1);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(
                getActivity(), android.R.layout.simple_list_item_1,
                new String[] { "ad", "sfsd", "sfsf", "asfsfs" });

        lst.setAdapter(adapter);
    }

    public block(Context context, AttributeSet attrs, int defStyle) {

        super(context, attrs, defStyle);

    }

    @Override
    public int getMinimumHeight() {

        return super.getMinimumHeight();
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);

    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        int w = MeasureSpec.getSize(widthMeasureSpec);
        int h = MeasureSpec.getSize(heightMeasureSpec);

// setMeasuredDimension(w, h); }

}

}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/fragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

</LinearLayout>

My main activity public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    getFragmentManager().beginTransaction().replace(R.id.fragment,
            new Frag()).commit();
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}


}

Answer 1

Exact problem in my case is I am trying to put listview inside scrollview. and thats NOT RECOMMENDED in general. But I have managed to expand my listview. though its not scroll able its better then before. Below is the code I have added in my constructor

ListView lst = (ListView) mView.findViewById(R.id.listView1);
        String[] arrayList = new String[] { "ad", "sfsd", "sfsf", "asfsfs",
                "ssfsff", "llkllk", "4323" };

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(
                getActivity(), android.R.layout.simple_list_item_1,
                arrayList);
        int totalHeight = 0;
        for (int i = 0; i < adapter.getCount(); i++) {
            View listItem = adapter.getView(i, null, lst);
            listItem.measure(0, 0);
            totalHeight += listItem.getMeasuredHeight();
        }
        LayoutParams lp = (LayoutParams) lst.getLayoutParams();
        int height = totalHeight;

        // arraylist list is in which all data is kept

        lp.height = height;
        lst.setLayoutParams(lp);

        lst.setAdapter(adapter);