Android :: Simple LinearLayout And Fill_parent?
Dec 24, 2009
I'm sure I am missing something simple...
Background:
I am new to android and UI design, and I just wanted to play around with layouts. Right now I want to stack a checkbox on top of text label. I am using the following xml layout which works fine:
CODE:................
My Tests (just to get a feel for how things works):
Scenario 1) When I set the CheckBox's layout_height to "fill_parent", the CheckBox takes up the whole screen and is aligned center (i.e. - the TextView disappears).
Scenario 2) If I instead set the TextView's layout_height to "fill_parent", the CheckBox does NOT disappear. In fact, nothing disappears, and the layout looks the same as the above xml where everything is pushed to the top-left.
The Question (and comments): How come Scenario 1 works the way it works?
This behavior seems inconsistent to me. I thought that fill_parent is only supposed to let the element fill up whatever space is available in the parent. So to me, it seems that the TextView should get whatever space it needs (since it is wrap_content), but the CheckBox should take up the rest of the space (so the TextView would be forced to the bottom of the screen, but not invisible). In other words... Scenario 2 makes sense to me, but scenario 1 does not.
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Jul 23, 2010
Consider a VideoView added to a Linear Layout with parameteres FILL_PARENT, FILL_PARENT.
The Linear Layout gets added to the root layout which is a Relative Layout, with parameters WRAP_CONTENT, WRAP_CONTENT.
Which parameters take precedence here?
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Aug 21, 2010
If I have 2 LinearLayouts split %50/%50 everything is fine. Weights are 1 and 1. As soon as I add a TextView inside the top LinearLayout, it stretches that layout. I use "wrap_content" as the documentation says I should when it comes to weights. As you can see the red and green should be split evenly and text on grey background should be inside red box.
Here is the code:..............
Now if I switch to "fill parent" as follows it actually works but it creates another problem. Here is the code (so far so good):
So looking at above we were forced to use "fill_parent" and we would think like we fixed the problem but here is the problem if we are using "fill_parent" (I took out the textview just to show the problem, textview doesnt make the problem go away anyways):
As you can see I assign the weights 3 (top red) and 2 (bottom green) but what actually happens is they get flipped: The red becomes 2 and bottom becomes 3. Just measure the pixels too see.
Here are the results of the 3 codes: http://imgur.com/iVt8g.jpg
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May 25, 2010
I have a RelativeLayout that has two LinearLayouts in it. One is a bunch of TextViews and EditTexts that make up a form and the other is a ButtonBar that submits the form.
anyways, everything looks great in portrait, but when i switch to landscape mode the bottom TextView/EditText element is being hidden by the buttonbar.
screenshot to show the problem. as you can see some of the "email" textview and all of the email edit text are being hidden by button bar.
http://i45.tinypic.com/2dt7qmt.jpg
and xml:
CODE:............................
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Jun 25, 2009
Why is the following code causing an exception? The Code throws a "mBaselineAlignedChildIndex of LinearLayout set to an index that is out of bounds" exception.
CODE:..............
If l2 is dont added to l1 than it works.
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Apr 29, 2009
Ive read the docu for home screen widgets but i couldn't find a possiblity to set the widgets width to fill_parent, instead i must use dip. The widget should fill the screen width regardless of the screen orientation. Somebody have a idea?
It is posssible to set a animation to a home screen widget? Something like,if special button of the widget is clicked, the widget shows a view that breaks out of the widgets borders which are defined in the home screen widget meta-data file?
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Aug 30, 2009
I am using a HorizontalScrollView to contain and scroll 3 child widgets, each of which is either an ImageView or a custom widget. What I'd like to achieve is something like homescreen, where each child widget filling up the whole width of the display and the user is able to switch to the other widget by flickering horizontally. I am having a hard time figuring out what properties I should assign to each of the child widget in order to have them fill the parent container. I get it working if I hard coded the width for each child but I'd like them to be able to fit to any screen resolutions, as the current Android homescreen does.
Here is the xml (pseudo like)
HorizontalView -> LinearLayout -> children widgets
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Nov 7, 2010
The Android Developer guidance on Creating a Custom Dialog specifies a layout that starts:
code:........
If I use this code I get a dialog that sits in the centre of the screen with about 40 pixels of the underlying view visible on each side.
What exactly does "fill_parent" mean (for the width and height)?
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Apr 26, 2010
I want my dialog box to fill the screen as I have seekbars set on fill parent, and so it makes this tiny dialog in the middle of the screen with tiny seekbars to go along with it.
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Sep 30, 2010
This is my layout
CODE:......
When I run this the list view occupies full screen. What I want is list view to be full screen except button area without mentioning dp.
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Feb 12, 2009
I am having this issue where I am trying to have a single TextView span one to two lines, fill the cell completely (so you can also click edges of the cell and it will trigger) and center-align.
This is the layout for the cell:
CODE:...
However cells seems to be filled correctly ONLY if it happens to wrap around and end up spanning two lines of text. It shows center-aligned and you can click anywhere in the cell to trigger the click. The cells that do not span multiple lines of text are left-aligned and trigger (highlight) only if you click where the text is. There is a "numb" area which does not react to clicks inside the cell if the text is short.
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Apr 29, 2010
I'm currently working on a small update to a project and I'm having an issue with Relative_Layout and fill_parent in a list view. I'm trying to insert a divider between two sections in each row, much like the divider in the call log of the default dialer. I checked out the Android source code to see how they did it, but I encountered a problem when replicating their solution.
To start, here is my row item layout:
CODE:..........
The issue I'm facing is that each row has a thumbnail of varying height (ImageView01). If I set the RelativeLayout's layout_height property to fill_parent, the divider does not scale vertically to fill the row (it just remains a 1px dot). If I set layout_height to "?android:attr/listPreferredItemHeight", the divider fills the row, but the thumbnails shrink. I've done some debugging in the getView() method of the adapter, and it seems that the divider's height is not being set properly once the row has it's proper height.
Here is a portion of the getView() method:
CODE:.........
The rest of the method simply sets the appropriate text and images for the row.
Also, I create the inflater object in the adapter's constructor with: inflater = LayoutInflater.from(context);
Am I missing something essential? Or does fill_parent just not work with dynamic heights?
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Jul 23, 2010
According to documentaion, FILL_PARENT basically lets the view take up the entire extra space. Weight also dictates how much of the extra space can be taken by the view. What is the difference? For eg: What happens when I use, new LinearLayout.Layout Params(Layout Params.WRAP_CONTENT,LayoutParams.WRAP_CONTENT, 1.0f)
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Oct 7, 2010
If I have the following:
CODE:..............
How can I get the body (second EditText) to fill the rest of the screen, but still have the scrollview kick in when the contents of the body are too long? Like a height="wrap_content" and minHeight="fill_parent"
layout_height="fill_parent" seems to not do anything if you put them in a scrollview
A working example of what I want is the email app compose window
I tried this and the EditText elements act like they are wrap_content and no filling is happening. Just scrolling if you type enough
CODE:...................
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May 13, 2010
I made a custom view. If I add the view to the layout XML file and I set the height to "fill_parent" "specSize" return 0. Why?
Code...
Does anyone know how I can get the height of "fill_parent"?
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Jan 29, 2010
When I'm clicking the linear layout it should be highlighted.
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Jun 14, 2009
I create a LinearLayout (orientation horizontal) which contains some TextView. The LinearLayout has a size of 1200px. When user move on, the screen, I would like to do like the Launcher application. I tried to use startScroll function. even if I set a distance, the layout doesn't move alone. Only distance did by user is slided. Does startScroll move alone all content? If yes, why my code doesn't work?
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Nov 21, 2009
I have put 6 linearlayouts in the main.xml file vertically arranged in the main linearlayout. initially i want 1, 2, 3 and 6 ll to be displayed, then after sometime, 1, 2, 3, 4, 6 and then after some time 1, 2, 3, 4, 5, 6. is it possible ?
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Jan 29, 2009
I have build a UI using linearlayout. It displays fine if phone is in vertical position. But when I switch my phone to horizontal position. Some content is not displayed. Is there anyway to add a scroll bar to linear layout?
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Jan 27, 2009
How do I place a TextView in the center of a horizontal LinearLayout?
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Feb 4, 2010
I'm am trying to learn how to create LayoutGroups. For a start, I created MyLinearLayout which is supposed to force all children into same width (yes, there is layout_weight, but that's beside the point.
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Jul 18, 2010
I want to inflate a childView of ExpandableChildView component.
Code:.............
Where linearOpt is a vector that contains a lot of LinearLayout objects that I have instantiated.
CODE:..
This is R.layout.itemrow xml:
But I received this error:
CODE:.................
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May 22, 2009
when I'm using a Datepicker on a LinearLayout and I set a date by finger, if I go to landscape mode the widget lost the date that I have previously set and set the actual date. It's a bug or I'm wrong something?
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Nov 1, 2010
I'd like to get the height of a linearlayout. I found more information in this answer
View.getWidth()/View.getHeight() won't give you a meaningful answer until the view has been measured.
How will I know that view has been measured? Is there some event for it?
Solution for me is to get layout's height in overriden onWindowFocusChanged()
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Oct 10, 2009
I'm trying to create a simple view of a header image, few buttons, then footer image. I'm using a LinearLayout inside a ScrollView.
Even though i'm using the android:layout_gravity="bottom" for the footer image, it's being placed about 1 cm above the bottom margin.
I'm using the following xml config
CODE:...............
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Mar 25, 2010
I recently struggled with an apparently simple Android layout: I wanted a WebView above a Button. It worked fine with the following parameters:
WebView:
Height: wrap-content
Weight: unset (by the way, what is the default?)
Button:
Height: wrap-content
Weight: unset
However if the web page became too big it spilled out over the button. I tried various combinations of weights and heights, and all except one either completely hide the button, or partially cover it...............
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Jun 25, 2010
I have made a LinearLayout in the code. It is joined to an BaseAdapter. This two class is representing an list in my app. The problem is: when I making scrool on the list it is going to black. I can't chache the cachecolorhint because, the LinearLayout hasn't got and param. like that. I don't want to rewrite the app. if it isn't nessesery.
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Mar 3, 2010
I am facing a problem in designing LinearLayout. What I want is the Textbox at the top and button bar at the bottom. But the top Textbox just don't appear. The xml file looks like this:........................
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Nov 7, 2010
On the emulator, I see the custom SurfaceView _map Object take up the whole screen, except for the EditText text-box at the bottom, right where it should be. When I run the same code, same everything, on my Motorola Droid, there is no EditText to be seen anywhere. I figure that I am missing something with the LinearLayout implementation I have. Until now, I've gotten off easy on learning how to use another API's layout manager.
Here's the code:.......................
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Nov 1, 2010
I've always been using RelativeLayout everytime I needed a View container, because of it's flexibility, even if I just wanted to display something really simple.Is it ok to do so, or should I try using a LinearLayout when I can, from a performance/good practices standpoint?
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