Android :: Animating The Background Of A LinearLayout
Apr 27, 2010
Is there a way of being notified when a TransitionDrawable has finished its transition? I'm looking for a way to animate the background of a LinearLayout, switching it back and forth between two images thus creating a pulsating effect. TransitionDrawable works nicely, but....once. I tried stacking several 'item' in the XML defining the transition, but no luck. It justs fades from item 1 to item 2 and sits there. I'm wondering if I shouldn't implement a custom Animation.
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Oct 6, 2010
I have a RelativeLayout with a tiled background. Is there a way to make a tween animation to fade out the existing image and fade in a new one?
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Aug 18, 2010
How to dynamically change the background LinearLayout?
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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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Sep 17, 2010
Is it possible to animate the expanding and collapsing of the groups in a ExpandableListView.
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Apr 8, 2009
How do I animate a Layout?
I have a RelativeLayout which sits in a certain position within my Activity; I want to glide it in and out from the bottom of the screen when a certain button is pressed.
I have found examples of animating the children of lists etc but this is not what I want. I simply want to animate the whole layout and the views within it together.
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Jun 22, 2010
I have tried a weather widget and its working fine. The Weather widget is an app widget and I update the widget once in 6 hrs similar to the application on android site using AlarmManager. Now I want to animate the widget (ImageView) every 100 ms similar to HTC homescreen.
I dont think AppWidgets will scale well for this case. How can I implement this widget?
I have seen "Custom Homescreens" in previous Android SDK's. Should I have modify the Homescreen widget for doing this or is there any other way.
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Aug 26, 2010
I'm drawing a ProgressBar in a custom View (SurfaceView) to it's Canvas, and it's drawn as expected. Except that it's not animating, no matter what I do. My custom view is animated properly, but I cant change the progress of the ProgressBar.
I've created the ProgressBar like this:
CODE:..................
And I draw it something like this (slightly simplified):
CODE:........
And I've tried updating it's progress manually as well:
CODE:.................
Any ideas on what I need to do in order for my ProgressBar to animate or change it's progress.
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Nov 5, 2010
This is more of a question about animating than a specific problem coding. i need to fill in the broad strokes left by the research i've been doing.
What i'm trying to do:
The activity should load with only the a togglebutton visible. when the button is touched, a png will be animated to a certain position relative to the togglebutton. also, another button will slide in from off screen and slide off if/when the togglebutton is pressed again.
What i can't figure out:
I can draw an image, but only via xml. creating an imageview and setting the background programmatically does nothing.
When i draw from xml, i can't move the image when the togglebutton is pressed like i want to. when i call getPositionOnScreen() i get a null pointer, even though the complier can see i'm referring to the imageview described in both xml and in code.
I'm calling getPositionOnScreen because via xml, i have the image positioned behind the togglebutton so that it's not visible until the button has been pressed and the image starts moving. the idea is that with different screen sizes i won't know exactly where the view is until runtime. getPostionOnScreen allows me to get the coordinates of the imageview so i know where it has been positioned. when i have a start position, can tell it to "move up" on the screen from behind the togglebutton by simply adding to x or y until it's where i want.
This is the code to draw the image (inserted in the onCreate method).
CODE:.......
This is the code i'm using to animate. when the button is clicked, it calls this method on the view from the listener.
CODE:...............
I'm well aware that this is horribly wrong and won't work. what i need to understand is why.
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May 19, 2009
I am using a SurfaceView, and wish to animate Drawables. All the animation tutorials I have seen concern using an ImageView, which as I understand is not a sensible approach from within a SurfaceView. Does anyone have any suggestions for doing frame-by-frame animation within a SurfaceView? Can it be done with openGL?
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Nov 10, 2010
Does anyone knows if it's possible to animate different views during the same animation: I have a linear layout containing 6 dices (each dice extends a textview) and I need to animate each dice to simulate a roll (each dice will rotate on itself). I know how to do this rotation on each dice by using 6 animations, but I want to group these animations in one, so that I would be able to add an animation listener to execute further instructions at the end of this animation. I tried with an animationset but didn't manage to do it.
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Feb 3, 2010
I'm trying to do something which seems simple. I want to have a map view, with a menu that slides up from the bottom of the screen where settings (for overlay) can be adjusted. However when I use a TranslateAnimation to affect the y position of the LinearLayout (which holds the menu), the buttons in the LinearLayout move, but there "hit area" stays in the same position as they were before the animation.
CODE:.........
I've also looked into tweening the view's marginTop value, but haven't even been able to determine how that would be done.
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Sep 29, 2010
I create a ProgressDialog in onCreateDialog() like so:
code:.........
Android, in its wisdom (or serious lack of it) decides to cache every dialog created through onCreateDialog(). Because of that, any subsequent call to showDialog(DIALOG_PROGRESS_ID) results in the same ProgressDialog instance being used but the animation has stopped working.
I've tried to re-set indeterminate in onPrepareDialog(), but that doesn't do anything. There is likewise no obvious method to call on the dialog instance that will reset the animation.
code:................
But maybe there is a way to get the ProgressBar itself and start it animating? so I tried the following after I asked this question:
code:........
But it didn't work either!
So, does anyone know if there is a way to restart animation on a ProgressDialog? If not, is there a way that I can force every showDialog() call to call onCreateDialog()? (this second question was answered by @TuomasR, but after pondering it I don't think this is a very good solution to my problem)
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Sep 2, 2010
Is there a way to animate drawables on a canvas using the android built-in animation classes?
Ive been modeling my test application, a game, after the example apps lunarlander and jetboy. They contain a lot of reusable code, but they manually update the drawable objects in real time. It seems like using the android animation built ins would be so much easier since they provide the type of animation I need¦a simple linear movement.
Is there a way to do this, or am I better off updating my canvas in real time much like the example apps.
If there is a way, could anyone get me started with some sample code? I am currently inheriting SurfaceView in my class.
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Sep 20, 2010
I am using android.hardware.Camera to get a preview and display it on a custom SurfaceView that implements SurfaceHolder.Callback.
I am trying to zoom in to the camera preview surface by a specified scale (not using the camera's digital zoom) but I can't seem to find a correct way to do it. I also need to be able to zoom out and scale down the preview.
I was hoping to be able to do this using a ScaleAnimation but it doesn't seem to work on SurfaceView, nor the FrameLayout containing the SurfaceView.
I also tried setting the size of the SurfaceView using setLayoutParams but that doesn't seem to work too well on various hardware and it would be tough to animate smoothly.
How to achieve this effect? Right now I am starting to think I might have to implement this using GLSurfaceView but I'm very unsure.
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Nov 22, 2010
I have an app that is working fine in 1.6 and up but crashing for apparently no reason in 1.5. The app suddenly quits with the following message...
CODE:............
This error happens when the app is 'idling' (ie not doing anything other than redrawing the screen). There is no state change and no user input. The error occurs after the same amount of elapsed time whatever I set the frame rate of the app to and occurs both on the emulator and device. Changing what I display on screen can stop the error but there appears to be no logic to this (in one instance not drawing a large image stops the error but elsewhere just drawing some text causes the app to crash in the same manner).
I am using SurfaceView for animations following the basic procedure in the Lunar Lander sample app.
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Jan 22, 2012
I got to make a really nice menu, with all buttons working...but when I got to the part of creating a character and making it move, I just couldn't find info anywhere.
how to create a character, and to make it move left/right when I press some kind of button? ( and how to make that special button too)
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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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