Android :: Getting Smooth Gallery Scrolling
Sep 17, 2010
I am working on a application, in which I want to show Image gallery containing full screen images. I have put the gallery in the application successfully. But I am failing to apply some properties to the gallery as per the app design demands. I am using android.widget.Gallery library of android. The things I am failing to do are:
1) I wanna scroll the gallery images one at a time, as now its getting scrolled more than one images in one scroll.
2) And on scrolling the gallery, the images coming next from left/ right should move smothly into the screen and should stop at the screen edges. It should not scroll beyong that in one scroll.
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Jul 14, 2010
I implemented a gallery, and inside it I have many listviews from left to right. For some reason Gallery works great with all views but not with listview. With listview, when scrolling on the gallery, sometimes I get little jumps.
Some notes: The gallery uses an adapter to find out what to show, and then the listview is created based on the adapter
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Nov 24, 2010
Probably this question is answered. If it is, could you point me in the right direction then.
I would like to add the smooth scrolling functionality into my application.
i.e. I have a huge text and I want to scroll it automatically (like in book readers)
Could anyone offer any examples of smooth scrolling?
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Feb 15, 2009
I am showing a RSS feed in my application using Webview as ListItem and it works great except that it is very sluggish at times. Since I don't know the size of the content then I can't set the height of each Webview and therefore I have the following code (this is the code for a single ListItem)...
But the "wrap_content" causes the Webview to readjust size when scrolling. The scrollbar-indicator of the listview also has problems knowing the size of the complete list so it changes size when scrolling. All this causes a very "jerky" experience when scrolling.
Is there any better way of doing this?
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Jan 31, 2010
Following this : http://stackoverflow.com/questions/2125354/best-approach-for-oldschool-2d-zelda-like-game
I got a simple 2D tiles generator working, im reading an int map[100][100] filled with either 1's or 0's and draw tiles according to their tile id, 0 is water, 1 grass.
Im using some basic Numpad control handler, using a camIncr (32.0f), i set the camera position according to the movement :
CODE:.......
In my draw loop, im just drawing enough tiles to fit on my screen, and track the top left tile using cameraOffsetX and cameraOffsetY (its the camera position / tile size )
Im using a GLU.gluOrtho2D for my projection.
Here is the draw loop inside my custom renderer :
CODE:.............
my tiledBackground draw function :
CODE:..............
The waterTile and grassTile .draw function draw a 32x32 textured tile, might post the code if relevant.
Everything is fine, i can move using numpad arrows, and my map 'moves' with me, since im only drawing what i can see, its fast (see http://stackoverflow.com/questions/2129125/android-opengl-es-simple-tile-generator-performance-problem where Aleks pointed me to a simple 'culling' idea)
I would like my engine to 'smooth scroll' now. I've tried tweaking the camIncr variable, the GLU.gluOrtho2D etc, nothing worked.
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Nov 23, 2010
I would like to add the smooth scrolling functionality into my application. i.e. I have a huge text and I want to scroll it automatically (like in book readers) Could anyone offer any examples of smooth scrolling?
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Aug 16, 2010
I have a gallery and when a image is selected, I want to start new thread (for loading other images). But I don't want to do it while the gallery is scrolling. How can I know the state of the gallery and if it is still scrolling? I can't use "setCallbackDuringFling(false)" because I have a textview under the image that has to be updated during the scrolling.
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Sep 7, 2010
I have a gallery with 7 images.
how can i got the position when stop the scrolling of gallery?
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Mar 3, 2010
I loaded some images into a gallery. Now I'm able to scroll but once started scrolling the scrolling won't stop. I would like the gallery to just scroll to the next image and then stop until the user does the scroll gesture again.
This is my code
CODE:.............
And the xmlLayout file
CODE:..................
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Nov 11, 2009
Gallery in Android is only horizontal scrolling support. And we want make one with vertical scrolling support.
We got plans below. Can anyone give us some advice about which one is right?
1) Linearlayout ( We think it's bad)
2) ListView ( We think it's a good option and get a little worry about performance--too many pictures!)
3) subclass of AbsSpinner like Gallery and do something like Gallery source.
Which one is easy, time-saving and less performance or other problems.
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Aug 24, 2010
I have a Gallery which Contains text Value such as Movie, Music, Games, Magzine etc., My Problem is, Whenever the User Scrolls the Gallery, I want to get the Postion of the Element.
For Instance,
User Scrolls the Gallery from Movie to Games means then i have to get the Position of Currently Selected Element ie postion of Games.
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Sep 20, 2010
I'm new to Android and I want to make an image gallery where each column is a category, and users can scroll both vertically and horizontally. I found a useful post about how to display list of images here. I'm wondering if it's possible to nest lists of image inside of a gallery view?
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Nov 2, 2010
I am looking for the following that I haven't been able to find by searching:
-Widget with different sizes
-Widget will automatically slideshow from selected drawers at a set interval (with random as option)
-You can scroll through the photos by swiping, preferrably seamless (with launcher that allows scrollable widgets I guess) so you can scroll really quick
-Clicking a picture will bring you its source
Would this be possible (or is there such a widget already)?
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Mar 24, 2010
I have gallery which contains a listview.
when you scroll sometimes the views inside the listview doesnt appear. i can see a shadow which belongs to listview but nothing inside listview appears
i have tried using invalidateviews on listview whenever the view becomes selected.
I am not sure how to resolve this.
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Jul 26, 2010
In my app i have gradient as drawable which i am using as background and i want it to make it look as smooth as possible. After googling and trying by myself i came up with the following. On nexus one if you call only setDither(true) your gradient is still banding so you have to set PixelFormat like this Window.setFormat(PixelFormat.RGBA_8888). But on the other side G1 does not support RGBA_8888 so calling it make the gradient even uglier than before so Window.setFormat(PixelFormat.RGBA_8888) will not work well on devices that don't support it.What is the correct way smooth my gradient on all devices on which my app will run.
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Feb 6, 2009
I'm trying to set the selection of a Gallery in code. I would like to have the Gallery smoothly roll down a few items over the duration of a second or two. At frist glance, it appears that two members would to the trick:Gallery.setAnimationDuration(int animationDurationMillis); Gallery.setSelection(int position, boolean animate); It turns out that the setAnimationDuration only seems to affect the rubber-bandy "return-to-center" effect of the Gallery. In other words, when a gallery comes to rest after a fling, and a gallery item is off center, the animationDurationMillis is used to control the duration of the Gallery centering up the item. However, the value seems to have no effect on the setSelection. No matter what value is set with setAnimationDuration, the Gallery seems to render about 2 or 3 frames when flying between items 1 and 10 for example. Is this working as designed? Does anyone know a trick or workaround that would let me properly animate setSelection? I'd be especially grateful if we could do it with an "Ease Out" effect.
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Sep 14, 2010
im currently playing around with a Game that architecture is basically like the example 2d Games like JetBoy / LunarLander and so on. But as things now running (and animating continuously) they have kind of "hiccups" when the GC is running. I have done all i can to allocate as much Objects in front. There is nearly nothing that is created "new" besindes some Strings that are used to set the Score and so on. (TextView doesn't take int's =( - So do you have similar Problems that the GC is "lagging" your 2s game ? any solutions ?
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Apr 16, 2009
I am using opengl es for images to translate from one position to other. But, the transition is not going in a smoother manner they are just jumping from one position to other. How can I get smooth transition of images? Rightnow I am using glRotatef() and gltranslatef(). Do I need to add anything extra? Please do respond.
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Oct 27, 2010
I am working on an porting an application supporting segmented video streaming to Android. For those who are not familiar with segmented streaming, it is when a complete video is divided into multiple segments. Each segment can then, for example, be encoded at different qualities to support different clients.
Anyway, my problem is that I am not able to get a smooth transition between segments. Currently, the only way I have gotten segmented streaming working, is to write the segments into independent, temporary files, and then load each file into the MediaPlayer once the previous has finished. This causes an interruption in playback between each segment, probably due to the I/O involved.
I have looked around for different solutions, among others, playlists and storing the videos directly in memory. However, none seem to work or be supported by Android. Also, I tried creating two MediaPlayer- objects and do something similar to double-buffering by preparing the next segment well ahead of the previous, but it only made the application unstable.
My question is therefore: Does anyone have any hints, tips or examples for how to do smooth transition between video segments? The segments I am working with are independent, so there is no dependency and they can be viewed as X number of independent video files.
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Feb 1, 2010
I am drawing a pretty simple scene, with one large texture the about size of the screen (two triangles). I notice that the frame-rate is irregular: in most of cases, a frame finishes in 17 ms. However, in about 1 of 10 times, the frame finishes in 33ms.
My guess is probably some background services need to run. However, the Linux scheduler is biased towards my FG app, so the BG services are usually starved, until they can't take it anymore and they grab the CPU from my app ....
I am seeing stuttering in the animation. Is this due to the irregular frame rate? Should I delay each frame so that all frames are rendered with 33ms frame time? If so, what's the best technique of achieving this?
Is there an API that I can call to guarantee CPU resources for the render thread .... I really hope Android runs on some sort of real time kernel ...
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Jul 5, 2010
On iPhone, Mobile Safari is WebKit based and supports hardware-accelerated -webkit-transform CSS properties. To be specific, I use the translate3d() transform.
What alternative is there for the Android browser? I need it to work on Android 1.5.
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Aug 26, 2009
I am creating an app that show some histograms off your traveling speed in different time periods (histogram for the last minute, histogram for the last 2 minutes etc.) I would like to have an animation, and have discovered that drawing everything takes around 300-400ms. Which is to long for making my animation smooth, the animation itself is quite simple (2 lines and 2 dots). What I draw every frame right now is 20 antialised strings, size 14, in average ~5chars 8 of these strings will change every second. 1 of the string will change with the animation (this will become 5 strings if there is time).
The main part of the screen, the one showing the histogram data, consist of a lots of squares which needs to be updated every second. (450 squares). The presentation is split into 5 frames in the same view (has to be same view as arrows in one frame might point into another frame). Invalidating only a part off the screen makes almost no difference (it does becomes a bit faster, but i still execute all my drawing stuff). I have tried to add a flag whether or not the main part is dirty, but if I don't draw it, it is cleared. I might be missing something here. One possibility could be to render all the mostly static stuff to a bitmap, and then simply draw the bitmap. That would mean 10 strings only had to rendered on orientation change.
I think it would make sense since the slowest routine is the one drawing all the text. (the following is a typical timing for the drawing routines, accumulated).
V/HMMULTIBAR( 352): 0 - Drawing time: 0 ms V/HMMULTIBAR( 352): 1 - Drawing time: 53 ms V/HMMULTIBAR( 352): 2 - Drawing time: 62 ms V/HMMULTIBAR( 352): 3 - Drawing time: 85 ms V/HMMULTIBAR( 352): 4 - Drawing time: 280 ms V/HMMULTIBAR( 352): 5 - Drawing time: 303 ms
I would really appreciate comments about whether or not offscreen rendering is the way to go, or if there is a simpler way.
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Dec 28, 2009
I'm drawing a rect to a surfaceview. Nothing special, just a test like this, in the surfaceview-extended class:
private int mPosX = 0; private Paint mPaint = new Paint(); Code...
the rect just bounces around the screen. I'm watching DDMS, I still see the garbage collector being called, even with this simple draw loop. There is no other application code being executed.
I'm wondering if it's realistic to expect the gc to not be called at all if we take care to not allocate any objects during our draw loops. I'm trying to extend this example to do some smooth animations, but every once in awhile the gc is called and you can see the drawing stutter. Although none of my application code is allocating any new objects, I don't know what the underlying API is doing inside surfaceview etc, and I doubt we can control that. Just wondering if this is not possible, I'd prefer to abandon this game idea up-front if we can't guarantee smooth animation.
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Nov 11, 2009
My girlfriend just got an HTC hero and I got a chance to play with it.
Even though it's specs are obviously less than those of the Droid it worked so much smoother, and I just don't understand why. Does android 2.0 just need to go through some growing pains?
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Aug 26, 2010
Originally this was posted in the Velocity ROM thread but I'm sure most Ally ROMs will be able to benefit from these fixes:
The following will enable JIT and tweak your windowsmgr to allow for smoother scrolling. Using ADB pull your build.prop:
abd pull /system/build.prop
add this line to the end of the file:
windowsmgr.max_events_per_sec=60
This will enable smoother scrolling.
Next, find the following line to enable jit:
#dalvik.vm.execution-mode=int:jit
and uncomment it by removing the # before it
Save the file and push back to /system/build.prop
reboot and your phone should be a little more responsive
I was having some permission denied errors when pushing the build.prop back via adb, so here's what i did:
(this part is optional, if your phone pushes the build.prop fine, then don't worry about this)
adb shell
su
mount -t refs -o remount,rw /dev/stl5 /system
cd sdcard
busybox cp -R build.prop /system
mount -t rfs -o remount,ro /dev/stl5 /system
sync
reboot
**to those having trouble w/ the busybox command, make sure the build.prop is in the sd card, the sd card is not mounted in the computer, and you are in the adb shell of the phone
also, make sure you are cd into /sdcard/ and can see build.prop in the root of your sdcard with ls then try to
busybox cp -R build.prop /system
alternatively if that doesnt work maybe try adb push build.prop /system/build.prop
Tested on Velocity 0.1.1 but may work with other ROMs.
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Aug 5, 2010
Has anyone noticed that the lock screen seems to be a little less smooth than before? I know it's something little but I was curious if I was the only one who noticed this.
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Aug 4, 2012
Looking to buy an android tablet such as the tf700, and the only thing holding me back is the browsing experience. Now i had the tf200 on ics and the browser was no where near as smooth. So have things changed at all?
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Aug 11, 2010
I did the manual Froyo update on my Moto Droid couple of days ago after following instructions on a reliable forum. However, I have been having problems like system hangs and video playback not smooth like before. I wanted to get back to my original 2.1 firmware and wait for the OTA update instead. Is there any way I can switch back to the old firmware update of 2.1?
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Aug 31, 2010
I tired installing the 2.2 update, but as many of us have seen problems have been occuring. I updated my sisters radio to the version that changed the start up screen. I didn't root the phone or apply any other update except for that one. Obviously I need to downgrade what I did to the stock. I downloaded SDK and will attempt to follow this:
Quote:
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Apr 19, 2010
Is there any info floating around about an aftermarket smooth backplate?I am really looking forward to the phone but I am not sure about that stepped off backplate.I would prefer a smoother one.Anybody know where to look for that kind of thing?
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