So I am aware that I can't use ListView inside ScrollView, because ScrollView gets the focus in that case and ListView becomes non-scrollable. But I have a program that goes out of screen when in landscape mode and I need to be able to scroll down to see the rest of the program so I use LinearLayout(vertical) with ScrollView that contains the most of the program and under that ScrollView I got my ListView. Now I want to be able to scroll down to my ListView when I am in landscape mode but it won't let me do that, it stops me where ListView begins. Is there a some kind of solution for this, or is it better for me to make my program stay in portrait mode?
You are still trying to nest a ListView inside a ScrollView in landscape mode...
I suggest creating a new landscape specific layout with two columns: the left hand side contains UI elements inside the ScrollView and the right hand side contains the ListView. This way both Views will still support scrolling.
Simply save this new layout in a new folder res/layout-land with the same file name as the portrait layout in res/layout. The OS will automatically switch layouts when the orientation changes.
You can read more about this: Supporting Different Screens
This end result will be similar to the old Google Market image:
The left, green side can scroll if necessary and the right, white side will scroll as well.
Do away with the VerticalLayout and insert the rest of the content as header and footer views of the ListView
Related
I am just getting into Android development and have a couple of questions about layouts.
I have a RelativeLayout as my root element and inside that I have the following items in the order:
TextView, TextView, Button, Button, Button, TextView
When I view the layout/activity in portrait orientation everything is fine. However when I switch my phone to landscape orientation the design "bunches up" and the first Button overlaps the second TextView and I can only partially see the last Button's background color and the last TextView text lands over that Button.
There is no scrollbar or means to view the whole display. Is there a way I can keep my layout the same when the screen rotates? I know I will not fit those 6 elements in a landscape orientation but I thought the layout would simply be scrollable to view the rest?
One simple trick is to just wrap your whole RelativeLayout inside a ScrollView (http://developer.android.com/reference/android/widget/ScrollView.html).
Keep in mind that the Scrollview can only contain, one layout element, in thisi case since you already have a root relativelayout that's just fine!
When the screen contains content I usually pu the entire layout or a big part of it inside a ScrollView, not only it will help users to see content when they switch their devices to portrait mode, but will also help user with devices with smaller screens see all your content
You can easily check how things will look using the layout editor on Eclipse or Android Studio.
On Android Studio, just open your layout file and switch to the design tab, then on the upper side there is an icon to change orientation.
A LinearLayout will guarantee that the views are placed below each other, not overlapping. A RelativeLayout does not do that if you don't specify each Views position in Relation to each other.
Android does not make your Layout scrollable by default if they don't fit on the screen. You have to wrap your Layout in a ScrollView.
As was pointed out, you can create different layouts for different screen sizes. You can also just create one with a ScrollView, it will make no difference when everything fits on the screen anyways (portrait mode. )
Right now I'm stuck how to manage to build a specific Activity in my app. I've added an image so I can explain my problem:
So first of all: all the content will be loaded from an API. "Static text" in my image means that I can define these parts in my activity.xml and don't have to do that in my Activity.java because these parts will be always the same for the screen (meaning the size of the elements, the content will be loaded from my API).
The green box should be horizontal scrollable or not depending how many boxes have to be shown here (1 to 3 possible).
The blue box will be generated in my Activity (in the end it should look like a table) and I want to define the layout of a single row in a separate xml (e.g. table_row.xml) so I could change it easily. This table can have up to 100 rows depending on how many are returned by the API.
So my problem right now is: Obviously this whole layout has to be scrollable so my first idea was to use ScrollView and a LinearLayout as child. But I read here on stackoverflow that the performance will be really poor if you use LinearLayout and add Views to it. So everyone recommended using a ListView for this part (meaning the blue box for my Activity). But that would mean only my blue box will be scrollable as you should not use a ListView in a ScrollView.
So my question is: How can I make this whole screen scrollable with a table dynamic in size without losing performance?
Put the first three layouts as ListView Header and make your blue box layout as the list view. By this you'll be able to scroll the complete View i.e. Blue Box, however the first three layouts will be static and won't scroll.
In my app I have a scroll view with n number of data to be listed out. There are two buttons one is named as UP placed above scroll view and the other is DOWN placed below scroll view.
Using the UP and DOWN buttons the list of views can be scrolled.
When the scroll bar is in top the Up button will be invisible and when the scroll bar reaches the bottom the DOWN button will become invisible, I have written logic for this using the getScrollX() method.
Now my problem is when there is very few data for example 3, the scroll bar will not be visible and the layout cannot be scrolled, in such a case both the UP and DOWN buttons need to be in invisible. How to do this, please suggest me a way?
You can try and use a ViewTreeObserver to check the dimension of the View inside your ScrollView. If the dimension exceeds a certain limit (such as the screen size), the ScrollView will be scrollable. See this preview SO answer for more details. Hope that helps!
I'm experimenting to see if the layout scheme I want to use is possible. I want to have an XML layout that's scrollable. Within that scrollable layout, I want to have a single line going horizontally across the screen (I used just a View with a fixed height and different color). When that horizontal line reaches the top of the screen, and as I scroll down through the layout, I want it to stop and remain at the top of the screen while being able to scroll through everything below it.
I've been messing around in XML trying to get it to work, basically putting a bunch of junk before it and after it.
Any ideas as to how that might work? Would I have to do something fancy with the java code to fix the red line at the top when the scroll position reaches a certain point? Your help would be greatly appreciated.
I am assuming you want something like Gmail app where when you scroll a mail the header sticks on top... To do this, you need 2 views. You have your regular scroller below and overlay a fixed view on top (you can use a relative layout to do this). When your cell goes past a certain spot, you want to populate and set the visibility of the fixed view to VISIBLE. This would give the impression that the view you want to 'stick' to the top really just got stuck rather than scrolled out of view. You'll have to work out the opposite scrolling scenario too based on the location and height of the scrolled cell/view.
HTH
I have sub-classed a DialogPreference and implemented a folder picker using ListView. Everything is working nicely when moving up and down the folder tree and displaying the folders in the listview.
My problem is that the dialog window grows and shrinks when I move up and down the folder tree (due to the different number of sub-folders in each folder). I am keen to keep the dialog window a fixed height as the folder tree is navigated.
As a solution I specified a fixed height for the list view and this works well in portrait mode, however I have noticed that when I switched to landscape mode the listview would not scroll and the only reason I can come up with is that the number of items in the listview is less than the fixed height so the scrolling is not enabled. This is a bit of a pain since it truncates the list in landscape mode and the user can not scroll down to see the rest of the list items.
Does anyone have any suggestions? I am not too hung up about using a dialog (full-screen presentation is OK as well), so any alternatives that can work within the PreferencesActivity is OK too.
Thanks in advance,
dsana123.
You can set the height of listview dynamically.
See
How can I put a ListView into a ScrollView without it collapsing?
So, you can solve the problem like this.
set the height of dialog
add listview in scrollview
set the height of listview dynamically.
If you followed above, you can scroll scrollview containing listview in landscape mode.
My best suggestion, create a custom landscape layout with a different fixed height than portrait. If you get a fixed height working, make sure you use display independent pixels and not fixed pixels.
You should be able to make full screen work as a separate Activity without a problem. ListPreference should work in a PreferenceActivity. My answer is vague because no code showing the problem was provided.