Develop Reference

How to make ViewPager scrollable from the parent view?

I was implementing the app tutorial which looks like this.
I made a nice and small ViewPager and placed it on the mock-up ImageView. The problem is that the ViewPager is not scrolled when I try to scroll it from elsewhere, say around the view pager indicators. This is so natural because there's no way that the ViewPager listens to touch event outside of itself.
How can I make ViewPager be scrolled when I try to scroll from elsewhere?
I've tried to detect touch events on the parent of the ViewPager but I couldn't figure out how to relate onFling() or onScroll() to ViewPager's scrolling.
If there's any better suggestion of implementing this kind of UI, what would be it?
Is there any tutorial or custom library similar to this?

set a View.OnTouchListener for your outer ViewPager and check inside if you are on proper page which is displaying inner ViewPager. if inner ViewPager isn't on its first or last you might dispatch MotionEvent to second dispatchTouchEvent(MotionEvent me)
outerViewPager.setOnTouchListener(new OnTouchListener()
{
#Override
public boolean onTouch(View v, MotionEvent event)
{
if(outerViewPagerAdapter.isCurrentPageHaveInnerViewPager() &&
! innerViewPagerAdapter.isOnFirstOrLastPage()){
innerViewPagerAdapter.dispatchTouchEvent(event);
return true;
}
return super.onTouch(event); //outer will get touch events
}
});
you might also adjust x/y touch cords in event before dispatching if needed

How to pass listview onClick events to parent view

I have a listview inside a RelativeLayout. I want any clicks on the listview to call the Relativelayout's onClick listener. How can the listview pass it's click events to the parent view.
I tried this not working.
listView.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
listView.requestDisallowInterceptTouchEvent(false);
return false;
}
});

I think you need to use one of those methods in order to be able to intercept the event before it gets sent to the appropriate components:
Activity.dispatchTouchEvent(MotionEvent) - This allows your Activity to intercept all touch events before they are dispatched to the window.
ViewGroup.onInterceptTouchEvent(MotionEvent) - This allows a ViewGroup to watch events as they are dispatched to child Views.
ViewParent.requestDisallowInterceptTouchEvent(boolean) - Call this upon a parent View to indicate that it should not intercept touch events with onInterceptTouchEvent(MotionEvent).'
for reference please check here EventHandlers

Can use in XML:
android:focusable="false"
In java code use:
v.setClickable(false)

Create a linearview on every activity to perfom action

I am trying to create view that sites underneath all others that will perform an action when 3 fingers are touched. These activities all have their own touches and swipes.
I have got this to kind of work by creating a class that extends linearlayout and intercepting touches. and adding this in xml.
But this is only being called when an item like button or view is a clickable or touchable surface and isn't becoming a touchable surface itself.
in
public class MyCatcher extends LinearLayout {
#Override
public boolean onInterceptTouchEvent(MotionEvent event) {
int action = event.getAction();
switch (action & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_POINTER_DOWN:
// multitouch!! - touch down
int count = event.getPointerCount(); // Number of 'fingers' in this
if (count > 3) {
doThis(mContext);
}
}
return super.onInterceptTouchEvent(event);
}
And in xml
<packagename.MyCatcher
....>
my normal layout
</packagename.MyCatcher>
So this code is working when an item that is touchable is touched but not becoming its own touch layer.
I have tried setontouchlister in the constructor with no luck.
Thanks for any help
EXTRA: When setting the touchlistener via onAttach I can get it to catch touches but I can't use event.getPointerCount() like normal as it's returning 1.
I'm worried this may take up lots of processing?/

Instead of a Layout, create a normal View and add it to your existing layout so that it spans the whole screen and lays "above" all other views (in z-order). Now it should get all touch events prior to all other views. Your onTouch... implementation should make sure to pass all touch events along to the other views (except if you want e.g. buttons not to work under certain circumstances, then do not pass the events along).

onintercepttouchevent()
Is called only whenever a touch event is occured. ie; touch event occurs only when a view item like button,textbox,etc having onclicklistener enabled is pressed . For your question you need to set the onclicklistener for the entire view.

Android ListView, not all Touch-Events

I want to use a ListView (and have done this successfully before) containing custom Views.
Basically these custom views are vertical sliders, obviously conflicting with the natural behaviour of the ListView.
I fill it with my custom Views from an Adapter, and these react to the touches on the Items,
but once I move my finger more than a few pixels, it will scroll, and the custom View will not receive any touch-events anymore.
How can I (nicely) prevent the ListView from scrolling, when I touch my own components?
Can I somehow disable ListView Selection, and just forward the touches to the Items, but still use the scrolling behaviour?
Thank you in advance.

To prevent the scrolling of listview you can inplement on touch listener as follows
listView.setOnTouchListener(new OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
if(event.getAction()==MotionEvent.ACTION_MOVE)
{
return true;
}
return false;
}
});
hope it will work and if it us useful to you give vote

You can intercept all touch events using onInterceptTouchEvent() in your root layout (one that contains the ListView, like a FrameLayout) as found here.
What you do there is capture the motion events (return true when a MotionEvent.ACTION_DOWN comes in), capture the following event in onTouchEvent(), decide whether the motion is meant for the list items or the list itself and accordingly dispatch the events.
Don't expect this to work easily. Understanding the flow of motion events and the interaction between onInterceptTouchEvent() and onTouchEvent() is challenging and making it work even more so. But I'm confident that this is a feasible way to solve your problem.

Android HorizontalScrollView disable touch handling but allow child get events

I have a case which includes 3 ScrollViews stacked following way:
HorizontalScrollView on top and it contains layout, which has ScrollView, which contains layout containing another HorizontalScrollView.
HorizontalScrollView
--------ScrollView
------------HorizontalScrollView
Without the top HorizontalScrollView touch event's work okay, and now I need to disable the top HorizontalScrollView, but allow the child's get events normally, child HorizontalScrollView will eventually scroll the top HorizontalScrollView.
Thanks.

i am not very clear regarding what you want to do but, this should work,
OnTouchListener skipTouchListener = new OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
//do nothing
return false;
}
};
yourView.setOnTouchListener(skipTouchListener);
This way yourView will not process the touch events.