Detect Scroll Up & Scroll down in ListView

Question

I have the following requirement:

• At first, data for page no: 2 is fetched from the server & the items are populated in a ListView.

Considering that both the prev page & next page are available in a scenario, the following code has been added:

 if(prevPageNo > 0){     mListViewActual.setOnScrollListener(this);  }   if(nextPageNo > 0){     mListViewActual.setOnScrollListener(this);  } 

What conditions should I put to detect scroll up & scroll down on the following methods:

1. void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount)
2. void onScrollStateChanged(AbsListView view, int scrollState)

After the action: scroll up & scroll down is detected , accordingly a service will be called with either the prev page no or next page no , to fetch the items to be populated in the Listview.

Any inputs will be helpful.

Gone through the following links but its not returning the correct scroll up / scroll down action:

link 1 link 2

Answer 1

try using the setOnScrollListener and implement the onScrollStateChanged with scrollState

setOnScrollListener(new OnScrollListener(){     public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {       // TODO Auto-generated method stub     }     public void onScrollStateChanged(AbsListView view, int scrollState) {       // TODO Auto-generated method stub       final ListView lw = getListView();         if(scrollState == 0)        Log.i("a", "scrolling stopped...");           if (view.getId() == lw.getId()) {         final int currentFirstVisibleItem = lw.getFirstVisiblePosition();          if (currentFirstVisibleItem > mLastFirstVisibleItem) {             mIsScrollingUp = false;             Log.i("a", "scrolling down...");         } else if (currentFirstVisibleItem < mLastFirstVisibleItem) {             mIsScrollingUp = true;             Log.i("a", "scrolling up...");         }          mLastFirstVisibleItem = currentFirstVisibleItem;     }      }   }); 

Answer 2

Here is a working modified version from some of the above-indicated solutions.

Add another class ListView:

package com.example.view;  import android.content.Context; import android.util.AttributeSet; import android.view.View; import android.widget.AbsListView;  public class ListView extends android.widget.ListView {      private OnScrollListener onScrollListener;     private OnDetectScrollListener onDetectScrollListener;      public ListView(Context context) {         super(context);         onCreate(context, null, null);     }      public ListView(Context context, AttributeSet attrs) {         super(context, attrs);         onCreate(context, attrs, null);     }      public ListView(Context context, AttributeSet attrs, int defStyle) {         super(context, attrs, defStyle);         onCreate(context, attrs, defStyle);     }      @SuppressWarnings("UnusedParameters")     private void onCreate(Context context, AttributeSet attrs, Integer defStyle) {         setListeners();     }      private void setListeners() {         super.setOnScrollListener(new OnScrollListener() {              private int oldTop;             private int oldFirstVisibleItem;              @Override             public void onScrollStateChanged(AbsListView view, int scrollState) {                 if (onScrollListener != null) {                     onScrollListener.onScrollStateChanged(view, scrollState);                 }             }              @Override             public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {                 if (onScrollListener != null) {                     onScrollListener.onScroll(view, firstVisibleItem, visibleItemCount, totalItemCount);                 }                  if (onDetectScrollListener != null) {                     onDetectedListScroll(view, firstVisibleItem);                 }             }              private void onDetectedListScroll(AbsListView absListView, int firstVisibleItem) {                 View view = absListView.getChildAt(0);                 int top = (view == null) ? 0 : view.getTop();                  if (firstVisibleItem == oldFirstVisibleItem) {                     if (top > oldTop) {                         onDetectScrollListener.onUpScrolling();                     } else if (top < oldTop) {                         onDetectScrollListener.onDownScrolling();                     }                 } else {                     if (firstVisibleItem < oldFirstVisibleItem) {                         onDetectScrollListener.onUpScrolling();                     } else {                         onDetectScrollListener.onDownScrolling();                     }                 }                  oldTop = top;                 oldFirstVisibleItem = firstVisibleItem;             }         });     }      @Override     public void setOnScrollListener(OnScrollListener onScrollListener) {         this.onScrollListener = onScrollListener;     }      public void setOnDetectScrollListener(OnDetectScrollListener onDetectScrollListener) {         this.onDetectScrollListener = onDetectScrollListener;     } } 

And an interface:

public interface OnDetectScrollListener {      void onUpScrolling();      void onDownScrolling(); } 

And finally how to use:

com.example.view.ListView listView = (com.example.view.ListView) findViewById(R.id.list); listView.setOnDetectScrollListener(new OnDetectScrollListener() {     @Override     public void onUpScrolling() {         /* do something */     }      @Override     public void onDownScrolling() {         /* do something */     } }); 

In your XML layout:

<com.example.view.ListView     android:id="@+id/list"     android:layout_width="match_parent"     android:layout_height="match_parent"/> 

This is my first topic, do not judge me harshly. =)