Добавить эффект отказов к списку в Android
Шаг 1 : Создать новый файл BounceListView в пакете com.base.view
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);
}
}
Шаг 2: В вашем макете, пожалуйста, измените
<ListView
android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
на
<com.base.view.BounceListView
android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>