Develop Reference

Collision occurred in html page horizontal scroll and recyclerview vertical scroll

I have a WebView in my RecyclerView, and the WebView loaded a html page. The part of the page can be horizontal scrolled, but when I horizontal scroll, the RecyclerView take the touch event easily and start to scroll vertically.
How can I solve this ?

Finally, I have figured out the solution about my question. The part of the WebView is in the top of the view. so I use this to intercept the touch event:
float touchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop()
webView.setOnTouchListener((View v, MotionEvent event) -> {
if (!scrollFlag && event.getY() < getHeight() / 2) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
downX = event.getX();
downY = event.getY();
break;
case MotionEvent.ACTION_MOVE:
if (Math.abs(event.getY() - downY) < touchSlop && Math.abs(event.getX() - downX) > touchSlop) {
getParent().requestDisallowInterceptTouchEvent(true);
scrollFlag = true;
}
break;
}
}
if (event.getAction() == MotionEvent.ACTION_UP)
scrollFlag = false;
return false;
});

How to swipe list view item left in Android?

I have a list view and I want to make it so I can swipe each item to reveal a delete button:
I've figured out how to recognise the swipe event, I am using this code (listItem is of type View):
listItem.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event)
{
switch (event.getAction())
{
case MotionEvent.ACTION_DOWN:
_xSwipe1 = event.getX();
break;
case MotionEvent.ACTION_UP:
_xSwipe2 = event.getX();
float deltaX = _xSwipe2 - _xSwipe1;
if (deltaX < 0)
{
Log.e("SWIPE", "Right to Left swipe");
}
else if (deltaX >0)
{
Log.e("SWIPE", "Left to right swipe");
}
break;
}
return false;
}
});
And when I swipe, I can see in the logs that the swipe event is being recognised.
However, I'm not sure how to physically make the list item start disappearing to the left?
Any help would be greatly appreciated.

If you know when the swipe is happening and how much the user has swiped you could call View.setTranslationX() depending on how much the user has swiped. Alternatively, you could forego the swipe detection logic altogether and use a ViewPager with only 2 pages. You would then override PagerAdapter.getPageWidth(...) in your PagerAdapter so that the delete button only takes up a limited amount of space.

Android: How to make a CustomListView which is in a Fragment in a SlidingDrawer scroll- and clickable?

I would like to set up following layout with working scroll and click events:
My CustomSlidingDrawer.xml:
<com.project.util.CustomSliderDrawer
android:id="#+id/slidingDrawerHotelList"
android:layout_width="0dp"
android:layout_height="match_parent"
android:allowSingleTap="false"
android:content="#+id/content"
android:handle="#+id/handle"
android:orientation="horizontal" >
<RelativeLayout
android:id="#+id/handle"
android:layout_width="0dp"
android:layout_height="match_parent" >
<RelativeLayout
android:id="#+id/content"
android:layout_width="0dp"
android:layout_height="0dp" >
</RelativeLayout>
</RelativeLayout>
</com.project.util.CustomSliderDrawer>
The width of the elements are set during runtime.
Here I have to mention, that my real content is in the handle of the Drawer, and the content is only a dummy. I'm doing that in this way, because I was not able to hide the handle. Or make it invisible. So, if I want to swipe in I touch the handle (my content) and pull. In the SlidingDrawer, the handle is a placeholder for a fragment which contains a CustomListView.
What now works: I can scroll the SlidingDrawer.
What behavior I would like to gain:
On the SlidingDrawer the MotionEvents are detected in X-Axis direction (Vertical swipe). If a MotionEvent in Y-Axis direction is detected, then the Events shoud go to my CustomListView. Even the onClicks should pass through to the ListView.
What I've tried: I read a lot: here, this page and this one
Then I tried to put all the navigation control in the main activity, what makes really sense in my eyes:
MainActivity:
slidingDrawer.setOnTouchListener(new OnTouchListener() {
int downX, downY;
#Override
public boolean onTouch(View v, MotionEvent event) {
int action = event.getAction();
switch (action) {
case MotionEvent.ACTION_DOWN:
downX = (int) event.getX();
downY = (int) event.getY();
break;
case MotionEvent.ACTION_MOVE:
int deltaX = downX - (int) event.getX();
int deltaY = downY - (int) event.getY();
if (Math.abs(deltaX) > Math.abs(deltaY)) {
Log.i(TAG, "scrollX direction");
isVerticalSwipe = true;
} else {
Log.i(TAG, "scrollY direction");
isVerticalSwipe = false;
}
break;
case MotionEvent.ACTION_UP:
break;
}
return false;
}
});
But when I try here to return "isVerticalSwipe" as local, the SlidingDrawer works not properly anymore. :-(
The 2nd try was to intercept the touch events in the custom sliding drawer:
CustomSlidingDrawer:
#Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
Log.i(TAG, "onInterceptTouchEvent ACTION_DOWN");
xDistance = yDistance = 0f;
downX = (int) ev.getX();
downY = (int) ev.getY();
break;
case MotionEvent.ACTION_MOVE:
Log.i(TAG, "onInterceptTouchEvent ACTION_MOVE");
final int curX = (int) ev.getX();
final int curY = (int) ev.getY();
xDistance += Math.abs(curX - downX);
yDistance += Math.abs(curY - downY);
downX = curX;
downY = curY;
if (xDistance > yDistance)
return false;
}
return super.onInterceptTouchEvent(ev);
}
Here happens only the DOWN event and the MOVE event is never reached.
I also made some trys with "dispatchTouchEvent" but I got no success.
I know, that the events will pass through the "layer" of my views - from top to bottom.
So it would be perfect to know, how I can implement the construct from the first link above in my CustomSlidingDrawer (= top view) and when a vertical swipe is detected keep and handle it and if it's a horizontal swipe, then please send it to the CustomListView and perform there the events.
Any help, thoughts, ideas or code snippets are appreciated. :)
Thank you!
[EDIT]
I've made some progress. I get now my events from the SlidingDrawer down to my ListView. I can scroll and click in the list - that works fine. But unfortunately, my SlidingDrawer shows no reaction anymore. These lines are in my custom SlidingDrawer:
#Override
public boolean onInterceptTouchEvent(MotionEvent event) {
gestureDetector = new GestureDetector(new MyGestureDetector());
if (gestureDetector.onTouchEvent(event)) {
return true;
} else if (event.getAction() == MotionEvent.ACTION_UP
|| event.getAction() == MotionEvent.ACTION_CANCEL) {
return false;
} else {
Log.i(TAG, "gestureDetector returned false");
return false;
}
}
class MyGestureDetector extends SimpleOnGestureListener {
#Override
public boolean onDown(MotionEvent e) {
Log.i(TAG, "onDown");
downX = (int) e.getX();
downY = (int) e.getY();
return false;
}
#Override
public boolean onScroll(MotionEvent e1, MotionEvent e2,
float distanceX, float distanceY) {
float deltaX = downX - e2.getX();
float deltaY = downY - e2.getY();
if (Math.abs(deltaX) > Math.abs(deltaY)) {
Log.i(TAG, "scrollX direction");
return true;
} else {
Log.i(TAG, "scrollY direction");
return false;
}
}
}
I don't really understand why it's not working, if there is a swipe in x-direction, then my Drawer should handle the gesture, bc I return true. Instead every event is forwarded to the ListView.
I tried to run "dispatchTouchEvent" before the "onInterceptTouchEvent" but I had no success. Maybe there is a better solution instead of using a SlidingDrawer for moving views by finger?

Okay, after a lot of tears, sweat and blood I finally found a solution which works for me: I don't take a SlidingDrawer anymore and move my layout via changing the LayoutParams.
Over the "dispatchTouchEvent" I get access to my list.
#Override
public boolean dispatchTouchEvent(MotionEvent ev) {
if (mGestureDetector.onTouchEvent(ev)) {
return true;
}
if (ev.getAction() == MotionEvent.ACTION_UP) {
Log.i(TAG, "ACTION_UP");
Log.i(TAG, "getLeft: " + getLeft());
if (getLeft() < 280) {
// run ani to left
} else {
// run ani to right
}
}
return super.dispatchTouchEvent(ev);
}
And in my GestureDetector I handle in the overridden onScroll-function the layout translation. If someone has need for the detector don't hesitate to ask, I'll share.

Correctly detecting a swipe on a GridView placed inside a ViewPager in Android

I have a ViewPager which uses GridViews for pages. I would like the ViewPager to switch pages when I swipe across the screen.
The problem is that swipes are not detected when they are made across the GridView. Outside of the GridView, the swipes work correctly; it seems that the GridView is trapping all touch events without passing it to ViewPager first.
While fiddling with the source code, I did this to a custom class extended from GridView:
#Override
public boolean onTouchEvent(MotionEvent event) {
return pager.onInterceptTouchEvent(event);
}
-- where pager refers to the ViewPager class. With this, ViewPager will correctly detect swipes and move pages accordingly, but it doesn't allow GridView to accept any events, so I can't click on the items.
What I would like to be able to do is correctly detect swipes in ViewPager and item clicks on GridView.

I had trouble with colig's implementation, but I was able to get it to work by subclassing ViewPager and overriding the onInterceptTouchEvent() method. I only checked for swipes in the X direction to allow for vertical scrolling if necessary.
private static final int minSwipeDistance = 30;
private float mTouchX;
#Override
public boolean onInterceptTouchEvent(MotionEvent event) {
boolean response = super.onInterceptTouchEvent(event);
float x = event.getX();
switch (event.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
mTouchX = x;
break;
case MotionEvent.ACTION_MOVE:
float dX = Math.abs(x - mTouchX);
if (dX > minSwipeDistance)
return true;
break;
}
return response;
}

Alix is on the right track. I managed to come up with this simple-looking fix. I'm not entirely sure of how it works, but it does! And for future reference, it works for other kinds of views too -- TableLayout, for example -- not just GridView.
#Override
public boolean onInterceptTouchEvent(MotionEvent event) {
x = event.getX();
y = event.getY();
switch (event.getActionMasked()) {
case MotionEvent.ACTION_DOWN: {
downX = x;
downY = y;
return super.onInterceptTouchEvent(event);
}
case MotionEvent.ACTION_MOVE: {
deltaX = Math.abs(downX - x);
deltaY = Math.abs(downY - y);
return super.onTouchEvent(event);
}
case MotionEvent.ACTION_UP: {
if (deltaX > 4 && deltaY > 4) {
super.onTouchEvent(event);
}
}
}
return super.onInterceptTouchEvent(event);
}

You can override onInterceptTouchEvent for dispatch evenement where you want

differentiating left and right scroll in gallery

Hie all ,
is there any method in android that can differentiate the left and the right scrolling actions in android.
it is actually a customized gallery view so what I am trying to do is that on scroll actions i want to different images. I mean on left scroll I've different images and on right scroll I've different images to show. so i need to differentiate the let and right scroll.

Try this code:
new OnTouchListener() {
#Override
public boolean onTouch(View currentView, MotionEvent touchevent) {
switch (touchevent.getAction())
{
case MotionEvent.ACTION_DOWN:
{
oldTouchValue = touchevent.getX();
break;
}
case MotionEvent.ACTION_UP:
{
float currentX = touchevent.getX();
if((oldTouchValue - currentX) < 50 && (oldTouchValue - currentX) > -50) {
return false;
}
if (oldTouchValue < currentX)
{
// Left swipe...
}
if (oldTouchValue > currentX)
{
// Right swipe
}
break;
}
}
return false;
}
}