Develop Reference

Differentiate touch events between customView and scroll view

I have one customView and customView added in scroll view. Now i want differentiate both touch events. My problem is when try to scroll, customView also getting touch event and when i try to change in customView, scroll view getting events.
How can we stop customView touch event when scrolling.
How can we stop scroll touch events when customView wants events.
Thanks in advance

You can set touch listener to child view and then in onTouch() event, you can block intercept touch event of parent.
i.e.
v.setOnTouchListener(new OnTouchListener() {
// Setting on Touch Listener for handling the touch inside ScrollView
#Override
public boolean onTouch(View v, MotionEvent event) {
// Disallow the touch request for parent scroll on touch of child view
v.getParent().requestDisallowInterceptTouchEvent(true);
return false;
}
});
About the second question, I don't know exactly what you're doing with customview but maybe you'd like to use click events instead because it's rather not user friendly to use different logic in ontouch and onclick as it will always fire up unexpectedly.

boolean isScrolling = false;
myScrollView.setOnScrollChangeListener(new NestedScrollView.OnScrollChangeListener() { #Override public void onScrollChange(NestedScrollView v, int scrollX, int scrollY, int oldScrollX, int oldScrollY)
isScrolling = scrollX != oldScrollX;
//for vertical scrolling
});
//then onTouchListener
if(!isScrolling){//Do operations on non scrolled state}

Android: Custom View in ScrollView

I created custom View similar to SeekBar. Now when I touch regular SeekBar and slide it work even I move finger out of SeekBar. But when I touch my custom View and move finger out of it ScrollView start moving and my View do not recieve MotionEven any more.
How can I make it acting same way as SeekBar?

You need to disable touch event of the parent view when the touch event is cached by you view, like this:
#Override
public boolean onTouch(View v, MotionEvent event) {
// Disallow the touch request for parent scroll on touch of child view
v.getParent().requestDisallowInterceptTouchEvent(true);
return false;
}

Android - ignore parent view touch on child view touch

I have a layout like
RelativeLayout_Parent
-> RelativeLayout_Child
both views having touch event.
But when I touch on RelativeLayout_Child, touch event for parent is also fired.
How to ignore parent view touch on child view touch?

Very simple, implement OnTouchListener over your child view, and upon receiving Touch Event just return true fro child, this will make sure touch event is not propagated to others.
child_view.setOnTouchListener(new OnTouchListener(){
#Override
public boolean onTouch(View arg0, MotionEvent arg1) {
// this will make sure event is not propagated to others, nesting same view area
return true;
}
});

Passing touch event from one component to ListView

I have a simple Button, that has a touch listener. Once it's triggered on ACTION_DOWN action, a ListView appears on top of that button (so that the ListView is under user's finger).
What I want is to "pass" that touch event from Button to that ListView, so that when moved up/down, the list view would also scroll up/down.
Simply put:
User touches a Button
A list view appears on covering that button
WITHOUT RELEASING A FINGER, user starts moving finger to the top/bottom screen edge,
The list view scrolls.
UPDATE
I tried making a custom ListView component with onInterceptTouchEvent overridden, but I do not clearly get what should go into that method?

You should create a custom class extending ListView, then override the method onInterceptTouchEvent(MotionEvent e). That method gets called whenever a view inside the list is touched.

You don't need any custom component.
Set your button onTouchListener as:
button.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View view, MotionEvent motionEvent)
{
switch (motionEvent.getAction())
{
case MotionEvent.ACTION_DOWN:
// popup the listView
break;
case MotionEvent.ACTION_MOVE:
// lstPopup is your ListView
lstPopup.dispatchTouchEvent(motionEvent);
break;
case MotionEvent.ACTION_UP:
// do other stuff
}
return false;
}
});
And set your listView onTouchListener as:
lstPopup.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View view, MotionEvent motionEvent) {
if (motionEvent.getAction() == MotionEvent.ACTION_MOVE)
{
lstPopup.setSelectionFromTop(0, (int) motionEvent.getY());
}
return false;
}
});

Android listview does not scroll when it is touched and pulled down at the same time

There is a list view. I wrote this to stop the scroll when the user touches the screen while scrolling:
public class OnTouchListner implements OnTouchListener{
#Override
public boolean onTouch(View v, MotionEvent event) {
if(event.getAction()==MotionEvent.ACTION_DOWN)
{
businessResultListView.smoothScrollBy(0, 0);
return true;
}
return false;
}
}
When i scroll the list down and when I touch the screen, the list view stops scrolling. But if I again try to scroll down / up, without lifting my finger from the scroll view, i am unable to scroll it.
If I take off my finger, then touch the list and then try to scroll, then I can do so.
How can I make my list scrollable after touch ?
Any help is greatly appreciated...

Give the Scroll id like scroll_home
ScrollView scroll_home;
scroll_home = (ScrollView) findViewById(R.id.scroll_event);
and on touch listview row add this function ...
this working well
v.setOnTouchListener(new OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
scroll_home.requestDisallowInterceptTouchEvent(true);
return false;
}
});