ScrollView nested ScrollView solutions in Android _android

Everyone, as we all know, two scrollview in the same direction in Android can not be nested, what if there is such a demand? (This requirement is usually made by people who don't know Android)

Is it really impossible to nest? Of course, as long as you write a scrollview, in the inside to do a bit of foot, it supports nesting.
Currently do this only support two scrollview nesting, more than two have to be improved, can set two have been able to meet a lot of needs, hehe, and now only do the longitudinal scrollview support, horizontal has not come to do oh.
screenshot of Effect：

Let's go to the core code. Inside the code I added a note to make it easier for everyone to read

Copy Code code as follows:

Package Com.sun.shine.study.innerscrollview.view;
Import Android.content.Context;
Import Android.util.AttributeSet;
Import android.view.MotionEvent;
Import Android.view.View;
Import Android.widget.ScrollView;
public class Innerscrollview extends ScrollView {
/**
*/
Public ScrollView Parentscrollview;
Public Innerscrollview (context context, AttributeSet Attrs) {
Super (context, attrs);
}
private int lastscrolldelta = 0;
public void Resume () {
Overscrollby (0,-lastscrolldelta, 0, getscrolly (), 0, Getscrollrange (), 0, 0, true);
Lastscrolldelta = 0;
}
int mtop = 10;
/**
* Roll the TargetView to the top
*/
public void Scrollto (View targetview) {
int oldscrolly = getscrolly ();
int top = Targetview.gettop ()-mtop;
int delaty = top-oldscrolly;
Lastscrolldelta = Delaty;
Overscrollby (0, Delaty, 0, getscrolly (), 0, Getscrollrange (), 0, 0, true);
}
private int Getscrollrange () {
int scrollrange = 0;
if (Getchildcount () > 0) {
View child = Getchildat (0);
Scrollrange = Math.max (0, Child.getheight ()-(GetHeight ()));
}
return scrollrange;
}
int currenty;
@Override
public boolean onintercepttouchevent (Motionevent ev) {
if (Parentscrollview = = null) {
return super.onintercepttouchevent (EV);
} else {
if (ev.getaction () = = Motionevent.action_down) {
To intercept a parent ScrollView's scrolling event
CurrentY = (int) ev.gety ();
Setparentscrollable (FALSE);
return super.onintercepttouchevent (EV);
else if (ev.getaction () = = motionevent.action_up) {
Restores the scrolling event to the parent ScrollView
Setparentscrollable (TRUE);
else if (ev.getaction () = = Motionevent.action_move) {
}
}
return super.onintercepttouchevent (EV);
}
@Override
public boolean ontouchevent (Motionevent ev) {
View child = Getchildat (0);
if (Parentscrollview!= null) {
if (ev.getaction () = = Motionevent.action_move) {
int height = child.getmeasuredheight ();
Height = height-getmeasuredheight ();
System.out.println ("height=" + height);
int scrolly = getscrolly ();
System.out.println ("scrolly" + scrolly);
int y = (int) ev.gety ();
Slide your fingers down.
if (CurrentY < y) {
if (scrolly <= 0) {
If you slide the head down, roll over to the parent ScrollView
Setparentscrollable (TRUE);
return false;
} else {
Setparentscrollable (FALSE);
}
else if (CurrentY > Y) {
if (scrolly >= height) {
If you slide the head up, roll over to the parent ScrollView
Setparentscrollable (TRUE);
return false;
} else {
Setparentscrollable (FALSE);
}
}
CurrentY = y;
}
}
return super.ontouchevent (EV);
}
/**
* Whether to give the rolling event to the parent ScrollView
*
* @param flag
*/
private void Setparentscrollable (Boolean flag) {
Parentscrollview.requestdisallowintercepttouchevent (!flag);
}
}