Android :: What's "proper" Way To Time Animation Frames?

Mar 16, 2010

I have a project that requires a view to be animated whenever the user performs a certain action - perhaps twenty frames or so, with a total duration of a second. There's more work required than just updating the view, so the animation classes are not helpful.

Right now my test program uses a very simple method: I have a handler that is called to start the animation. The handler's handleMessage() method calculates the new frame, invalidates the view, and calls sendMessageDelayed(obtainMessage(0), 50); However, the animation isn't smooth - especially, for some reason, in landscape mode. Portrait mode seems much better (on a G1, if it matters).

This suggests to me that this isn't the right way to... handle... this problem. What would be a better way? Calculating time deltas? Starting a new thread whenever the animation starts and having it repeatedly calculate and invalidate instead of relying on the handler, even though it means creating and destroying a new thread every time? (most of the time the program is idle; the user interacts with it every few seconds, typically). Starting a thread and leaving it running?

Whether that's the right way or not, what's the most accurate way on Android to measure time, and to sleep for a specific duration?

Android :: What's "proper" way to time animation frames?

General :: Create Frames For Animation For Android?

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i know how to create file but i want to know how do you create animation frames for that zip file

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Is there a % you realistically want to stay around for every hour the phone is on but the screen is turned off?

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When trying to show more than one animation at the same time sometimes one of the animations "hickups" and just seems to jump right to the end position.

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Android :: Run An Animation For A Short Period Of Time?

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Android :: Alpha Animation - Staying In Last Animation Frame When Animation Is Completed

Nov 17, 2010

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Android :: HTC Photo Frames?

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Android :: Splitting GIF Into Frames

Jul 22, 2010

Trying to play animated GIFs on Android here
It's anything but smooth. On Android 1.5, the Movie.decodeStream()/decodeFile() returns a null. On Android 1.6, with the GIF files I've got, it returns a zero-sized movie with zero duration - clearly not adequate.

The referenced question suggests splitting the GIF into frames (and then rendering these). How exactly do i accomplish that, please? Tried opening one of my GIFs with GNU giflib in Windows. It choked on the very first frame. The GIF itself is all right, all browsers (save Android's) display and animate it fine. Worked with giflib 4.1.4. Not sure what was broken in 4.1.6, but there you go. Next step: build giflib for Android via NDK, somehow integrate with the Bitmap class. giflib it is. In conjuction with Bitmap.copyPixelsFromBuffer. The colors are all askew right now, but the basic design seems workable.

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Android :: Capture Frames From Video File?

May 20, 2009

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Android :: Obtaining Video Frames For Processing

Dec 31, 2009

I am trying to decode and obtain all frames in a video stream, each of which would be processed by a native signal processing engine and re-encoded back to a MPEG4/MP4 file. I noticed that there was a getFrameAt() function in earlier versions of SDK but its not available in v 1.6 on which I am working. As I am fairly new to Android, I would like to know from more experienced people around here as to how I can extract video frames into a buffer for processing.

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Android :: Live Wallpaper OutOfMemory Error When Have More Than 30 Frames

Aug 25, 2010

I've been trying to make a simple live wallpaper out of a boot animation. So basically i have about 50 .pngs in my drawable folder. I'm able to set the animation to about 10-20 frames and it works great. But once i set it to about 30 frames...I get an OutOfMemory Error. I was hoping maybe someone could take a look at my code and maybe give an example of how I could achieve more frames? That would help so much i've been looking at this for hours > <

Here's my code:..................

And here's a logcat if that'll help at all:


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Android :: Read Image With Multiple Frames - Animated Gif

Feb 3, 2009

I would like to know how to read in an image file which has multiple frames in it. Something like an animated gif file. I would like to perform frame by frame animation with a file of this type. I don't want to have each frame as drawables in the resource directory. Can anyone throw some light on how to perform the above mentioned tasks.

P.S - I have already checked the example in the API demos where an animated gif is read as an object of type Movie. I don't want to read it in as a movie file.

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Android :: Remove One Of Frames I Added Using AddFrame In Droid?

Feb 1, 2010

I would like to know if it is possible to remove one of the frames I added using addFrame in Android?

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Android :: Animation.start - Or Animation.startNow - Does Not Start The Animation Immediately

Aug 30, 2010

I have a strange issue - from time to time the animation that should fade out my control (ImageButton) does not kick in immediately. I am using the fadeout animation to hide it and then in myListener on its end (onAnimationEnd) I put new resource as the image on the button.

Somewhere in my app code:

Animation a = AnimationUtils.loadAnimation(this,R.anim.fadeout); a.setAnimationListener(new myListener(location)); buttons[location].setAnimation(a); a.startNow(); // regardless if its start() or startnNow() it will work in most of the cases but not 100% reliable I actually can see in debug Log when its late, happens after few more clicks

Then in myListener.onAnimationEnd(Animation a):buttons[location].setImageResource(R.drawable.standard_button);

Seems there is a rule that the every 4th or 5th animation does not start ...

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Android :: Display Animated Gif / Extract Frames From It And Convert Them Into Drawable?

Sep 7, 2010

I want to display animated gifs in my aplication.
As I found out the hard way Android doesn't support animated gifs natively.

However it can display animations using AnimationDrawable:

The example uses animation saved as frames in application resources but what I need is to display animated gif directly.

My plan is to break animated gif to frames and add each frame as drawable to AnimationDrawable.

Does anyone know how to extract frames from animated gif and convert each of them into Drawable?

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Android :: How To Capture Preview Image Frames From Camera Application In Programming

Jul 31, 2010

I am writing an app to capture the camera preview frames and convert it to bitmap in Android.

Here is my code:...........

After I start preview, the callback got called with data, but the bitmap is null.

What did I do wrong when convert the byte array to BitMap?

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Media :: Video Recorder Frames Per Second?

Apr 10, 2009

So with Cupcake looming, does anyone know what kinda Frames per second the video recorder will have?

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How To Manually Display Frames From Camera

Dec 5, 2010

I have built a face detection app where I get the frames from onPreviewFrame, do the face detection and then draw a circle on a canvas above my surfaceView. The problem is frames are automatically displayed using the surfaceview thread when Camera.StartPreview() is started. This is obviously necessary for the PreviewCallback to kick in. As the processing, face detection and drawing, is done in a separate thread(I am assuming here), there is a 2 second delay between the frame being displayed and the result of that frame being processed and drawn on the canvas.

What I want to do is stop the camera preview displaying the frames and display them myself after processing. I believe this has three benefits:

The delay with disappear.I can draw straight to the bitmap instead of on a canvas which is useless as you can not undo what you have done.It will keep memory consumption low by not having two threads using the same image.

I've read that it is possible to display frames from the previewCallback, how to stop the frames being displayed automatically?

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General :: Any Way To Visibly See Frames Per Second On 2D Or 3D Apps?

Jan 14, 2012

For 2D or 3D applications (like GTA III for instance), I would like to be able to tell what FPS the game is running at pretty much for benchmarking purposes.

A game called osu!droid can show FPS in the bottom right corner, but this option can be enabled or disabled via it's options:

I would figure Android SDK for Windows to have some sort of way to see this, but I couldn't find anything. If there is a way to display FPS via the SDK (or maybe an app).

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Android :: Frame Animation Callback When Animation Is Complete

Jul 29, 2010

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Android : Want To Extract Video Frames From Running Video In Droid

Jan 26, 2010

Possible Duplicate:
Getting frames from Video Image in Android

I wanted to know if it is possible to extract frames from a running Video in Android? I need to extract frames at regular intervals and send them for further processing.

Would someone be able to find an answer for me?

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Android :: Proper Way To Dim The Screen?

Aug 16, 2010

I have seen 2 methods so far in my search, both of which I am having trouble with.

Method 1)
Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, 100);

Method 2)
IHardwareService hardware = IHardwareService.Stub.asInterface(ServiceManager.getService("hardware"));

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Android :: Proper Way To Set Timer?

Dec 9, 2009

What is the proper way to set a timer in android in order to kick off a task (a function that I create which does not change the UI)? Or there is a better way in android (android's handler)?

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Android :: Open Proper App With Intent

Sep 13, 2010

Forgive me if this is a topic that has already been discussed, but I've searched for hours and can't seem to find the answer I'm looking for. I'm trying to cut my teeth on Android programming with a simple file manager app and currently have most all functions working, but I can't seem to open a selected file with the appropriate app.

Here is my current code:


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Android :: How To Specify Proper Layout For View?

Mar 3, 2009

I want to re-use 1 adapter (similar to well known ImageAdapter from samples) with 2 different views - Gallery and GridView. I need to specify LayoutParams for the each View returned by getView() method of my adapter. In case of Gallery it should be instance of Gallery.LayoutParams, and in case of GridView it should be GridView.LayoutParams. I'll get an exception for sure if I'll try Gallery.LayoutParams with GridView and vice versa.What is the best way to do that? Can I somehow use "parent" parameter (ViewGroup parent) for that?

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Android :: Proper Way To Use Non Extended Classes?

Oct 7, 2010

I have an app I am working on and being new to Android Dev I am running into a situation. I have a Scores class not extended from anything (Activity,Service, etc) but in the same package that needs to access SharedPreferences

public class Scores {

Context ctcx;

public Scores(Context context) { ctcx = context;


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Android : Can I Get Proper Uri Of A Particular Contact In Droid 2.1?

Mar 18, 2010

I have written an application and added 2 contacts on emulator, but i
am not able to update their names on android 2.1, code is working on
android 1.6 platform with the following code.

ContentValues contactValues = new ContentValues();
contactValues.put(Contacts.People.NAME, firstName+" "+lastName);
getContentResolver().update(UpdateContactUri, contactValues, null,

In android 1.6 i am getting Uri for those two contacts are "content://
contacts/people/1" and "content://contacts/people/2".

but in 2.1 I am getting these values are "content://contacts/people/8"
and "content://contacts/people/9" and while updating its giving
"java.IllegalArgumentException, Empty values" exception.

When i tried to put a static Uri like "content://contacts/people/1",
code was debugged sucessfully but contact was not updated.

How can i resolve it, why i am not getting uri like 1.6 platform ?

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Android :: Proper Video Formats And Settings?

Jun 5, 2010

I'm having a bit of trouble getting videos to play on my HTC Evo with Android 2.1. I have several videos that I play on my PSP, and work just fine. However, when I transferred them over to my Evo's MicroSD card and tried to play them in any video player, they only played the audio stream, and no picture was shown. I never had trouble getting PSP-formatted videos to work on phones before; they worked n my G1 just fine. I assumed that because the Evo and PSP even had similar-sized screens, it would be even more compatible. It sounds somewhat foolish when I type it out, but one could expect it to work. I have tried playing it in the stock video player, the Meridian player, and the Video Player app from the android market, and they all had the same error. The file is an .mp4; and, as I said, gave me no problems when played in the PSP's video player.

Here's the specifications on the video file:
Type: MPEG4
Video Codec: AVC
Audio Codec: AAC
Size: 25 MB
Length: 00:23:41
Width: 480
Height: 272
Aspect Ratio: 16:9
Data Rate: 99kbps
Total Bitrate: 147 kbps
Frame Rate: 23 fps

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Android :: Understanding Proper Alarm Flow

Jan 11, 2010

the app I'm trying to implement allows the user to select a sound file (MP3 or WAV) to play at a specific date and time showing a dialog with a progress bar and an OK/Cancel button allowing the user to stop the playing of the sound file. I want it to behave something like the countdown apps I've seen or even the built-in alarm clock app. As I'm implementing this simple (I thought!) app, I'm trying to better understand the platform and make the application conform to the Android way.

As I've been writing the app, I learn more about how things are supposed to work on the Android platform. And here's where I'm getting a bit confused. During my attempts to get the alarm to fire and display, I'm learning that properly formed Android applications are not supposed to show dialogs as a result of a background service or broadcast receiver being invoked through Android's alarm service. Instead, I think, the app is supposed to use a notification on the status bar to alert the user. The user then has the option to look at the notification to see what the app is trying to tell them..............

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