Pages

Tuesday, December 10, 2013

Android bouncing scroll view like iphone scroll view

First make a class "BounceScrollView" in your project

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

public class BounceScrollView extends ScrollView {
private static final int MAX_Y_OVERSCROLL_DISTANCE = 200;

private Context mContext;
private int mMaxYOverscrollDistance;

public BounceScrollView(Context context) {
super(context);
mContext = context;
initBounceScrollView();
}

public BounceScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
mContext = context;
initBounceScrollView();
}

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

private void initBounceScrollView() {

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);
}


}


Then add a scrollview in your xml file..

<ScrollView 
   android:id="@+id/list"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
/>
replace ScrollView with you class with package name like...
<com.nik.bounce.BounceScrollView 
   android:id="@+id/list"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
/>


No comments:

Post a Comment