Get Item position, at the center of the screen, while scrolling the HorizontalScrollview

I have dynamically loaded some(1000) images inside the HorizontalcsrollView. The user can scroll the HorizontalScrollView front and back.
What I need is, to find the item position at the center of the screen while scrolling. FYR, I have start the HorizontalScrollView from the center of the screen and end at the center.
I have tried with addOnScrollChangedListener of the HorizontalScrollview, but I couldn't get the exact position of the center item.

Edit: Tried to get x position and left position, while scrolling, but always return 0.
Note, I have set padding left and right to my HorizontalScrollView.
It always starts from center of the screen and ends at center of the screen.

horizontalScrollView1.setOnScrollChangeListener(new View.OnScrollChangeListener() {
    @Override
    public void onScrollChange(View v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {                      
        int x1 = horizontalScrollView1.getLeft();                          
        int getX=(int)horizontalScrollView1.getX();
    }
});

layout file

<?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">

    <HorizontalScrollView
        android:id="@+id/horizontalScrollView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_gravity="center_horizontal"
        android:layout_marginBottom="15dp"
        android:fillViewport="true"
        android:scrollbars="none">

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

            <View
                android:id="@+id/viewWhite"
                android:layout_width="match_parent"
                android:layout_height="10dp"
                android:layout_centerInParent="true"
                android:background="@color/white" />

        </RelativeLayout>
    </HorizontalScrollView>
</RelativeLayout>

Class file:

ImageView iv;
RelativeLayout layLandmarks = (RelativeLayout) findViewById(R.id.layLandmarks);
FrameLayout.LayoutParams lp1 = new FrameLayout.LayoutParams(2000, FrameLayout.LayoutParams.WRAP_CONTENT);
layLandmarks.setLayoutParams(lp1);
JSONObject landmarks = jsonObject1.getString("landmarks");
JSONArray jsonArray1 = new JSONArray(landmarks);
for(int j = 0; j<jsonArray1.length();j++){
    JSONObject jsonObject2 = jsonArray1.getJSONObject(0);

    landmarkId = jsonObject2.getString("id");
    landmarkName = jsonObject2.getString("title");
    landmarkDesc = jsonObject2.getString("description");
    latitude = jsonObject2.getDouble("latitude");
    longitude = jsonObject2.getDouble("longitude");
    video_time = jsonObject2.getString("video_time_in_sec");
    //   Log.e("video_time_in_sec", video_time);
    landmarkIcon = jsonObject2.getString("image");
    iv = new ImageView(VideoPreviewWithRecycler.this);
    iv.setId(i);

    Picasso.with(VideoPreviewWithRecycler.this)
            .load(landmarkIcon)
            .resize(40, 45)
            .into(iv);
    params = new RelativeLayout.LayoutParams(40, 45);

    params.topMargin = 0;

    params.leftMargin = Integer.parseInt(video_time);
    params.addRule(RelativeLayout.RIGHT_OF, 0);

    layLandmarks.addView(iv, params);
}

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