Android :: How Animations Work - Implemented
Jun 16, 2009
I've been looking around in the framework source and I can get my head around some things. For instance, in the ScrollView, the animated scrolling is done by using computeScroll(). To make the screen redraw (and thus call computeScroll() again), postInvalidate() is used. Why is that one used, instead of a regular invalidate-call?
Secondly, I wonder some things about the Animation framework. I know how a ViewGroup is responsible for animating the children (modifying the Canvas and so on), but what drives the animation, i.e. what makes the screen redraw over and over again? In the case of the ScrollView, it's the call to postInvalidate() made from computeScroll(), but what is it in the case of an Animation?
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Jun 18, 2013
create to get ads on my free application, ok first off I have been following this book
Beginning Android games 2011
Beginning Android Games
Now this book implements a very nice and simple game framework which I use (a simpler version can be found here.The Android Game Framework: Part I - Kilobolt
Now this framework doesn't use any type of XML file what so ever, it uses a framebuffer to draw things onto the screen. now when the application is first started, this is the first method called which is in the AndroidGame.java
[HIGH]
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
[code]...
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Nov 11, 2010
What is this widget called (the one with the three buttons).
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Apr 3, 2009
I notice in the source code they are not used in critical loops, e.g. in View.java :
http://android.git.kernel.org/?p=platform/frameworks/base.git;a=blob;...
I can see this kind of code which would be much easier implemented as an ArrayList :
1867 private void addInArray(View child, int index) { 1868 View[] children = mChildren;
1869 final int count = mChildrenCount;
1870 final int size = children.length;
1871 if (index == count) { 1872 if (size == count) { 1873 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT];
1874 System.arraycopy(children, 0, mChildren, 0, size);
1875 children = mChildren;
1876 } 1877 children[mChildrenCount++] = child;
1878 } else if (index < count) { 1879 if (size == count) { 1880 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT];
1881 System.arraycopy(children, 0, mChildren, 0, index);
1882 System.arraycopy(children, index, mChildren, index + 1, count - index);
1883 children = mChildren; 1884 } else { 1885 System.arraycopy(children, index, children, index + 1, count - index);
1886 } 1887 children[index] = child;
1888 mChildrenCount++;
1889 } else { 1890 throw new IndexOutOfBoundsException("index=" + index + " count=" + count);
1891 } 1892 };
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Sep 13, 2010
I mean in runtime. Sometimes I get "called unimplemented OpenGL ES API" error but it can not be catched. Is there a way to figure out what function is implemented or not, in runtime?
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Oct 21, 2010
Can somebody point me to the right direction how the navigation overlays for My Tracks are implemented? I'm talking about the "buttons" for navigating appearing on the left and right side if you tap on the screen. Any pointers?
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Jan 29, 2010
How to include .jar files in android for a particular application in which KSOAP is implemented?
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Mar 3, 2009
Is it possible to build a spreadsheet-like grid? I would like to select single cells, or one row at a time,like a database viewer.
Or would it need to be implemented at the framework level?
I'm thinking of a UI equivalent of something like this AJAX control, which may be opened in the WebView: http://www.hisdigital.com/misc/flexigrid/.
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May 15, 2013
I have seen several 2DIN car headunits that has Android 2.3 supports FM Radio and Handsfree and can be controlled through the UI itself. how is it implemented?
eg: In eBay, search for item No : 130862564199
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May 14, 2009
I want to add one more endpoint audio device in android and am trying to modify the setRouting() functions to support the selection of the new added audio device. As far I traced, the doRouting() in class AudioHardwareOss should perform the audio endpoint device selection. However, donRouting() just returns NO_ERROR without any other functionalities. So, my question is where and how endpoint audio device selection is achieved.
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Sep 25, 2010
I have an application that has a tabActivity and 3 tabs. all off the tabs use a location listener and work with locations. i implement onPause and onResume for every tab to remove and start listening for location accordingly. is this the right way to go? i had another idea to work with and that was implementing a location listener to the tabActivity and doing broadcasts to the child tabs with the location, but it seemed more complicated.
The problem with my current solution is that whenever i switch tab i lose the location i got in the previous and i cant use getlastknown location because i dont want the last location on start of the application.(does this make sense?) what can i do to solve this problem. a thing that will work better will be to have one variable that will hold the last location from the onLocationChanged and i can observe its changes and call methods onChange.
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May 22, 2010
Are we allowed to return 30 days from the day we ordered the phone, or 30 days from when we received the phone? (april 19th and april 28th for me). If the droid 2 is coming out with similar specs and a keyboard i think i want that.
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Apr 17, 2010
How can reduce the power usage in my application.
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Apr 22, 2010
I am implementing one application gust i am adding validations in login page implemented then two fields required username and password button login i am applying validations then focus are not getting then set focus in unfilled edittext
CODE:.............
Not filling username then filling password then username entered some toast displayed fine focus are entered in username edittext this is the problem how can implemented focus in unfilled username.
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Jun 19, 2010
i'm a bit stuck with remote services in android. thing is i implemented a remote service in package "a.b.c" and i want other applications to be able to access this service. i got rid of the whole crappy aidl-stuff and designed the "interface" of the service to work via broadcasted intents. works fine so far...
problem is: how do i get a different application (different package, different project, maybe even a different developer, ...) to start/stop the service?
CODE:..........
This will crash my app immediately on startup. what did i do wrong? how will i get this to work?
once it's running, commands and data will be passed via broadcasts. so that should be no real problem...
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Jul 11, 2010
Has anyone implemented an Android Shake Detector that works well on most phones?I thought it would be fairly simple to implement but I keep getting false results. Basically, what I'm doing is setting up a sensor Listener, checking to make sure it is a SensorManager.SENSOR_ACCELEROMETER event, then only checking the event if the last event I received was more than 50 milliseconds ago (to try to reduce the amount of checking I do).Then I look for 3 "Shakes" within 4 seconds.A "Shake" to me being a speed reading of over 1000 followed by a speed reading of less than 400 within 1 second. If I don't get three "Shakes" within 4 seconds then the counter is reset to zero.At times it seems to work well but I continue to have instances where I just pick up the phone, and it triggers all three shakes, which makes very little sense to me because at other times, I can physically shake the phone quite hard, and not trigger all three shakes.As I said.. it works about 90% of the time correctly, but a 10% error rate is making the feature I want to implement useless.
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Apr 25, 2010
I want develop a HTML, CSS , Javascript application that has pages that flip animate the same as on the iphone. I have tried JQTouch but the animations do not work. how to flip a page in the Android 2.1 browser?
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Jul 7, 2009
I want to port an small open source AES encryption class to Android, and it would cut my work down a lot if the API of Android is as close as possible to the Java 6 API.
How much is implemented (or referenceable), as I have tried searching about this on google, and i have not yet come up with anything useful?
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Apr 5, 2010
I am trying to create a menu that slides in when it is drawn. I created an animation in res/anim called map_toolbar_in.xml:
CODE:..............
Then I have a linearLayout which I attempt to use it in:
CODE:...............
When I run the program I get a bunch of errors, starting with:
CODE:...................
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Jun 26, 2009
I defined some complex AnimationSet in xml and would like to run it on several Views (View.startAnimation()). i cannot just create one instance of this AnimationSet (using AnimationUtils.loadAnimation()) and use it as parameter of View.startAnimation(), so i have to create several instances of this AnimationSet. since loading it from xml is rather slow operation, is there a way to load it once and then clone it when needed?
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Feb 28, 2009
How to use Popupwindow's animation? i tried setAnimationStyle() but couldn't get it working... i assume i need to pass style id (R.style.something) defining windowEnterAnimation & windowExitAnimation but as i said it didn't work
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Mar 9, 2010
I've a succession of 2 Intent: Intent intent = new Intent(); intent.setClass(EntryPoint.this, MainClass.class); startActivity(intent);
And I'd like an animation (which is present in res/anim) occurs during the transition between these 2 Intents...
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Jul 20, 2010
Actually i m little bit confused in animation set? i have more than two or three animations how can i put them in animation set? and one more thing this is very important..that my image is moving from one place to another through translate animation. but it is not showing the motion and looking like that the image was invisible there and after clicking its visible.. how can i show motion that image is moving from one place to another in translate animation.
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Nov 14, 2010
I need to run six animations simultaneously (each animation simulates a roll of dice, each dice is a custom text view) and at the end of those animations, I need to get back the number of each roll. As each animation changes the number of each dice five times (to simulate the roll), I want to wait that each animation has ended to calculate the sum of each roll. I tried to regroup in one the six animations (so that with an animation listener, I would have been able to wait the end of the animation) but I didn't manage it.
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Mar 13, 2010
I'm developing chess game for Android (androidchess.appspot.com). If I want to add animations, should I use custom View extending Canvas (I do this now), or custom View extending SurfaceView?
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Mar 10, 2009
I want to save an animation that I wrote in android in gif format. I know how to take screenshot but is there any possibility to capture an anmation?
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Jul 19, 2010
I am at a stage where I can understand and write a decent Android application. At this stage, I am still not comfortable with SurfaceHolder, Canvas, View invalidate() etc. I don't have a CS background so I must've missed these from a CS Graphics course or something.
Starting directly with Android seemed like a bad idea because there are not many examples out there. And sometimes I am getting things done, but I don't understand what the heck is going on. For instance, there are a few dangling observations. Calling invalidate() from within a view calls its onDraw method but from outside it doesn't do anything and I don't know why this is happening. I know SurfaceHolder can be a powerful thing but I don't know how to use it.
For an absolute beginner to be able to handle this stuff, what are the resources one should follow? Is it animation basics or screen rendering or something else altogether? I mean, it cannot be the case that Android guys invented these concepts right? They must be similar to something out there which has some tutorials already. My end goal is to put myself in a position where I can write some simple custom views that can animate themselves and use some basic physics to react to touch events.
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Nov 15, 2010
So i have a code developed where when some button from the app is pressed it should get displayed in the Textview with some Animation(to add some fun). Is it possible to have text animations in Textview or should i use Canvas or SurfaceView for drawing this aplhabets with animation?
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Mar 1, 2009
i tried to use my popupWindow with some enter/exit animations - it has setAnimationStyle() method for that purpose. after some time i realized i cannot use my own custom animation styles which is ok but a bit limiting. so i tried system ones: R.style.Animation_Toast works ok, but R.style.Animation_Dialog doesn't. looking at xml definition files i found that Toast animation uses simple alpha animation and Dialog animation is a set of alpha combined wit scale animation. is it a problem for WindowManager to deal with complex animations?
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Sep 15, 2009
I am wondering how to use custom in/out animations for a ViewAnimator, such as the 3d flip animation in the ApiDemos. Details below in case you have the time to read.
The following methods:
animator.setInAnimation(AnimationUtils.loadAnimation(this, R.anim.fade_in));
animator.setInAnimation(this, R.anim.fade_in);
Require that I use the animation as a XML resource but the documentation says the XML only takes "<alpha>, <scale>, <translate>, <rotate>, interpolator element, or <set>" as the root element. So it seems to indicate that you cannot use a custom animation as an XML resource?
I also tried:
animator.setInAnimation(new AlphaAnimation(0.0f, 1.0f));
Which doesn't seem to work (no animation happens just plain cut).
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