I have a vertical LinearLayout. It shall act as a quick jump bar. So the width is very small and the height matches nearly the whole screen height. When I touch it and move around inside, everything is fine. That means, my onTouchEvent() is called and I can get (and follow) the position of the finger. But since the bar is not very wide, the user can easily drift outside of that view. So it would be necessary to let the user continue the movement even when outside the view. In fact the same thing like a ListView does.
I don't know why a ListView's onTouchEvent() is called even when outside the ListView, but not in case of my LinearLayout. I tracked it down back to the dispatchTouchEvent(). Here the situation is the same that method is always called for the ListView (even when outside) but not in case of the LinearLayout (when moving outside).
I'd be very happy if someone could give me a hint. Thanks a lot!
Bernd
You could use Android's TouchDelegate feature. It supports a bigger touch area for single views. Here is an example: https://stackoverflow.com/a/1343796/636579
i think that you should try increasing the padding of a view from all sides so that when user will click near the view in area of padding the ontouch or onClick method will be called
android:padding="10dp"
Related
My project need to insert lots of data,I use scrollview to put them in one page.
Now I want it can scroll the item I press(primary Edittext) to the middle of screen.
I tried to use onFocusChangeListener()+scrollTo() with edittexts,but doesn't work very well.
Is there any better way to do it?
Have an onTouchListener for the scrollview.
When the user touches the screen, grab the x and y coordinates and then simply scroll to that point. So scrollview.scrollTo(x,y).
See here for more info
I have searched a lot but I couldn't find an answer.
I want to implement something like in Go Launcher. When you drag an icon in app drawer and move it out of container top or bottom bound, the list begins to scroll.
So far, I have tried following things:
Dispatch touch events to simulate scrolling - impossible while touching the screen
Use smoothScrollBy() method - almost there, but it scrolls only screen height distance
Use scrollBy() - it moves only the container and leaves blank space. I would put there some rows if only I could be able to reuse views that went off the screen.
I need the ListView to scroll SMOOTHLY.
So here goes ma question. Anybody knows how can it be done? I'll put a gratitude in About section of my app to person who will help me:)
using listview and try scrollToPosition（），or smoothscrollBy（）
I have a text view where in i have to keep ages between 1-99. I also have two buttons ^ and v(i mean up and down arrows) on clicking them the values of the age should smoothly scroll to next or previous value.
I have been trying different ways but couldnt achieve smooth scrolling. Can anyone please give me any idea of how to achieve the task.
I think the easiest way is to simply put the TextView within a ScrollView, and let the arrows interact with the ScrollView, by using things like the fling method and playing around with the velocity parameter to suit your needs.
Use the animation framework.
When pressing down, start the 'down'-animation.
When pressing up, start the 'up'-animation.
Read more about animation here: http://developerlife.com/tutorials/?p=343
View animation is not much matured and hence i am noy sure if that can be used for moving the views.
Please find the description below:
Another disadvantage of the view
animation system is that it only
modified where the View was drawn, and
not the actual View itself. For
instance, if you animated a button to
move across the screen, the button
draws correctly, but the actual
location where you can click the
button does not change, so you have to
implement your own logic to handle
this.
Source
To scroll smoothly you can try using the scroller component.
Reference
What you would need to do is pass the duration of the scroll in the constructor and then use the property
setFinalY(int newY)
to increment the counter position by 1 unit (equal to the height of the item).
Please let me know if that helps!
I have a ScrollView which has two hidden images, one at the top and one at the bottom. In between there is a bunch of visible content.
What I need to do is make these images hidden by default but when you scroll all the way up or all the way down you could see them as you're scrolling. But then as soon as you stop scrolling it should bounce back to the visible area so that the hidden images aren't showing.
Basically I'm trying to imitate the bounce scrolling feature of the iphone UIScrollView.
I have my ScrollView all setup and I do a scroll at the beginning so as to hide the top hidden image. Now all I need to do is detect when a scrolling has ended, figure out the Y position, and check whether a hidden image is shown. If it is, I would just programmatically scroll the view back so that the hidden image is hidden.
I hope all that made sense.
So anyways, I know how to programmatically scroll a ScrollView. Now what I need is some sort of callback to tell me when a ScrollView ended scrolling and also a way to get the ScrollView's current 'Y' position. Are there any such methods I could use?
I looked through the ScrollView docs but nothing jumped out at me. I'm still not very familiar with the Android naming schemes so maybe I missed something obvious somewhere.
Anyways, any help would be appreciated here. Cheers.
You can use an OnTouchListener to detect when the user presses/releases the list.
You can also use the onScrollStateChanged method of the OnScrollListener class (most likely in conjunction with a touch listener) to detect changes in the SCROLL_STATE - when the list has stopped scrolling the state will change from a state that is not SCROLL_STATE_IDLE to SCROLL_STATE_IDLE.
Alternatively if you are using 2.3 or above you can use an OverScroller to get the desired effect (see Modifying Android OverScroll for how to change the over scroll effect to an iPhone like one).
I have a UI layout that's comprised of a single outer layout that contains three internal layouts. The internal layouts are essentially a header, body and footer.
I would like to cause the top, header view to become completely hidden if it's forced to shrink past a certain threshold. It contains a logo image, and if it shrinks past a certain point, I'd rather just hide it completely.
What's the best way to do this? Is there a way to accomplish this statically in a layout xml? If not, do I need to subclass the View and listen for resizes? Is there another way?
Subclass your View an override the onLayout or onMeasure methods. That is when the View itself decides its width and height. After onMeasure is completed, you can call this.getMeasuredHeight() and check if its below your threshold. If it is, just hide it.
I don't think you can do it in the XML, but whenever anything happens that could shrink it (you might need to use an onTouchListener() if it's shrunk by the user's finger), you can call getHeight(), and if it's less than a certain value call setVisibility(View.GONE) on it.