scrollbar moves roughly while scrolling. how to make scrollbar move smoothly when enable fastcrollenable="true"?
I've been looking for it for a month. both in android documentation, stackoverflow, and other web ,but i can't find it.
in my listview , im just add....
android:fastScrollEnabled="true"
setSmoothScrollbarEnabled(boolean enabled)
When smooth scrollbar is enabled, the position and size of the scrollbar thumb is
computed based on the number of visible pixels in the visible items.
note that sometimes your answer would be easily found in java
Related
I'm building a simple app for a game that has labels, textfields and buttons. Every time I try to run the app the elements on the screen keep moving around in the emulator even if they look find in the editor. Picture of layout
I've tried adjusting them by dragging and dropping and experimenting by changing XML. I think I'm missing something, but is positioning elements on the screen the way you want usually this difficult?
If you use lots of views in vertical direction use Linear layout, if more on horizontal use relative layout as you can position elements left-right or center w.r.t each other or parent easily, use a combination of both to get best results.
I noticed a cool effect in a game I've been playing and was wondering how to accomplish it in an android application using the RecyclerView (or any other kind of list object in android).
What I'm trying to accomplish: when you scroll the items in the recyclerview, instead of having those items scroll off the screen, I'd like those items to start stacking on top of each other near the edge of the screen. So when you scroll towards the edge, the items start stacking on top of each other. And when you scroll away from the edge towards the middle of the screen, the items start unstacking off of each other.
I'd post an image, but I currently don't have enough reputation, so here is a link to what I'm trying to accomplish:
http://i66.tinypic.com/1z3uubm.gif
Another link in case other one is not available:
http://imgur.com/8GkWKdQ
Any code examples or a general direction would be greatly appreciated! Thanks.
I can use mouseWheel() from java.awt.Robot to simulate a vertical mouse wheel scroll. On OS X I have a Mighty Mouse that will scroll horizontally too. Is there any way I can simulate this with java.awt.Robot? The documentation only shows vertical scrolling.
Not according to that framework.
But an alternative to this, and keep in mine I haven't done this in your environment, is if you are able to generalize the keystroke of the left and right scroll. You can essentially issue you application to move right and left. You can implement a keylistener that does that tick. This is how I have done a few of these for web application using JS.
I have a mainscreen which currently scrolls (and I have the arrows on the right) but the scrolling seems to be focused on the ButtonField objects that I have on the page. Is there any way to set the scrolling to be non-focused scrolling (moving a few pixels each time). Is there a way to set this?
Other ideas I have had (which sound hacky so I want to avoid):
- Placing NullFields around to scroll
- Manually listening to the trackwheelRoll event and moving appropriately
That's not really how scrolling works on trackball BlackBerry devices. It's always based on the change of focus from one field to another. The only time the whole screen may scroll "smoothly" is when there are no fields that accept focus (or on touchscreen devices such as the Storm).
To use an analogy: just think of each focusable field on the screen as being like a line of text in a text editor. Just by moving the cursor with the arrow keys, you can get the screen to scroll but only when the cursor hits the edge of the current visible screen, and then only to the next line in a one-line increment. On trackball BlackBerrys, the trackball is the equivalent of the arrow keys -- and unfortunately there isn't an analog to "smoothly dragging the scrollbar with a mouse" in the text editor. Hope this makes sense!
I'm making an application that has many lines of data coming back from a Database stub(which will become an Oracle database), and for some reason the scroll bar stops at about the 500th element. I'm wondering if there's anyway to have all the elements show within the scroll bar.
I'm assuming here that you're using Windows, because there is a fairly general problem with scrollbars on Windows: the maximum value is a short int, 32,768. Therefore, if the height of the inner composite of a ScrolledComposite is greater than 32,768 pixels, the composite will be clipped.
I haven't found a robust way of fixing this, but there is a workaround: separate the scrollbar from the composite that you wish to scroll. You can't create a ScrollBar, but you can make a ScrolledComposite that is precisely as wide as a ScrollBar, then attach a ScrollListener to it and have it adjust the layout position of the scrolling composite.
Somewhere I have a snippet, but I'm not even exactly sure if this diagnosis applies to your scenario.
You might need to set the minimum and maximum values of the ScrollBar. You would use the setMinimum() and setMaximum() methods, respectively.
It's also a good idea to set the page increment. This is the number of scroll lines that the selected value changes by when the user clicks the area between the thumb and the arrow buttons, or presses the Page Up or Page Down buttons. You would use the setPageIncrement() method.
Finally, Oracle may impose a maximum number of rows you can retrieve from a table. I believe the default is 500 rows.