Android: How to get iPhone-style overscrolling in ListView

BounceListViewActivity.java

import java.util.ArrayList;
import java.util.List;

import android.os.Bundle;
import android.app.Activity;
import android.widget.ArrayAdapter;
import com.example.bouncelistview.BounceListView;

public class BounceListViewActivity extends Activity {

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

BounceListView mBounceLv = (BounceListView) findViewById(R.id.list);
mBounceLv.setAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, getData()));
}

private List<String> getData() {

List<String> data = new ArrayList<String>();
data.add("abc");
data.add("dsdsd");
data.add("dsds");
data.add("dff");
data.add("hghg");
data.add("jhj");
data.add("kjk");
data.add("abrerec");
data.add("afdfbc");
data.add("fdf");
data.add("abdsdc");
data.add("sds");
data.add("wewe");
data.add("sfsf");
data.add("dfggrfg");
data.add("fdfdvdvd");
data.add("vdvdv");
data.add("abdvdvc");
data.add("abdvdvc");
data.add("dvdvdv");
data.add("bbbfb");
data.add("avdvdvbc");
data.add("vdvdv");
return data;
}

}

BounceListView.java 


import android.content.Context;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.widget.ListView;

public class BounceListView extends ListView {
private static final int MAX_Y_OVERSCROLL_DISTANCE = 200;

private Context mContext;
private int mMaxYOverscrollDistance;

public BounceListView(Context context) {
super(context);
mContext = context;
initBounceListView();
}

public BounceListView(Context context, AttributeSet attrs) {
super(context, attrs);
mContext = context;
initBounceListView();
}

public BounceListView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mContext = context;
initBounceListView();
}

private void initBounceListView() {
// get the density of the screen and do some maths with it on the max
// overscroll distance
// variable so that you get similar behaviors no matter what the screen
// size

final DisplayMetrics metrics = mContext.getResources()
.getDisplayMetrics();
final float density = metrics.density;

mMaxYOverscrollDistance = (int) (density * MAX_Y_OVERSCROLL_DISTANCE);
}

@Override
protected boolean overScrollBy(int deltaX, int deltaY, int scrollX,
int scrollY, int scrollRangeX, int scrollRangeY,
int maxOverScrollX, int maxOverScrollY, boolean isTouchEvent) {
// This is where the magic happens, we have replaced the incoming
// maxOverScrollY with our own custom variable mMaxYOverscrollDistance;
return super.overScrollBy(deltaX, deltaY, scrollX, scrollY,
scrollRangeX, scrollRangeY, maxOverScrollX,
mMaxYOverscrollDistance, isTouchEvent);
}

}

activity_main.xml


<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/app_name" />

    <com.example.bouncelistview.BounceListView
        android:id="@+id/list"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

</LinearLayout>