Android :: Possible To Start Surface View With Game Thread
Aug 7, 2010
I've read several example programs and tutorials to try and solve my problem but they all seem to go the same way. I've used a couple Activities and xml documents to create a menu that loads when my game starts.When the user clicks the "Start The Game" button, it loads a new Activity that sets the view with my game thread and all of the game properties.I know this activity works because I've run it alone as its own project, but every way I've tried to start it after the Menu,I get a nullPointerException and it force closes.I read the SurfaceViewOverlay tutorial and attempted to use that implementation, but I'm using a SurfaceView, not a GLSurfaceView.I'm debating rewriting my entire program to use OpenGL but I figured I would see if anyone else knows what I'm doing wrong here.If you need the code snippets I can paste some here, but it's not really the specific code that's wrong.
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Aug 7, 2010
I've read several example programs and tutorials to try and solve my problem but they all seem to go the same way.I've used a couple Activities and xml documents to create a menu that loads when my game starts. When the user clicks the "Start The Game" button, it loads a new Activity that sets the view with my game thread and all of the game properties.I know this activity works because I've run it alone as its own project, but every way I've tried to start it after the Menu, I get a nullPointerException and it force closes.I read the SurfaceViewOverlay tutorial and attempted to use that implementation, but I'm using a SurfaceView, not a GLSurfaceView. I'm debating rewriting my entire program to use OpenGL but I figured I would see if anyone else knows what I'm doing wrong here.If you need the code snippets I can paste some here, but it's not really the specific code that's wrong, I think it's the way I'm using(abusing) the language.
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Apr 1, 2009
I have an Activity that was created based on the TriangleRenderer example. It works flawlessly as a standalone project, but when I use it as the tab of a tabhost there is a problem. At startup the whole activity is just black - I can get touch events and do everything else but it doesnt show anything. When I change the orientation (and therefore recreate the activity) it all works well. Maybe the problem comes from the View focus. My SurfaceView is not focused when created inside of the tabhost. I tried to fiddle around with the methods available in my onCreate() and onPostCreate(), but couldnt find a way to get the SurfaceView focused. The following sourcecode blocks in the guardedRun() method because needToWait() is true because !mHasFocus is true. If I exclude the ! mHasFocus, it goes on but shows a black View anyways. Do you have any idea why it does work after orientation change, but not at the first startup? The Activity looks quite simple.
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Jan 22, 2009
How do I create blur surface from android.view.Surface?
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Aug 29, 2009
I am trying to add an image on surface view. I have coded...
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Nov 11, 2010
I want to change the size of surface view at run time when it is changed to Landscape Mode?
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May 3, 2010
I'm trying to render a 640x480 RGB565 image using OpenGL ES on Android using GLSurfaceView and Native C code. Initially I had a 0x0501 error with glTexImage2D, which I was able to resolve by changing the image dimensions. But now, in the "drawFrame" call, when I do glDrawTexiOES to resnder the texture, I'm getting the following error on the Logs: drawtex.c:89: DrawTexture: No textures enabled I'm already doing glEnable(GL_TEXTURE_2D), is there anything else I should do? Is there a complete example showing GLSurfaceView with native code using textures?
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May 29, 2010
I have a simple program that draws the preview of the Camera into a SurfaceView. What I'm trying to do is using the onPreviewFrame method, which is invoked each time a new frame is drawn into the SurfaceView, in order to execute the invalidate method which is supposed to invoke the onDraw method. In fact, the onDraw method is being invoked, but nothing there is being printed (I guess the camera preview is overwriting the text I'm trying to draw).
This is a simplify version of the SurfaceView subclass I have:
public class Superficie extends SurfaceView implements SurfaceHolder.Callback {
SurfaceHolder mHolder; public Camera camera; Superficie(Context context) { super(context);
mHolder = getHolder(); mHolder.addCallback(this); mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
} public void surfaceCreated(final SurfaceHolder holder) { camera = Camera.open();
try { camera.setPreviewDisplay(holder); camera.setPreviewCallback(new PreviewCallback() {
public void onPreviewFrame(byte[] data, Camera arg1) { invalidar();
} } ); } catch (IOException e) {} } public void invalidar(){ invalidate(); }
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
Camera.Parameters parameters = camera.getParameters(); parameters.setPreviewSize(w, h);
camera.setParameters(parameters); camera.startPreview(); }
@Override public void draw(Canvas canvas) { super.draw(canvas);
// nothing gets drawn :( Paint p = new Paint(Color.RED);
canvas.drawText("PREVIEW", canvas.getWidth() / 2, canvas.getHeight() / 2, p);
} }
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Jul 6, 2010
My objective is to run a glowing animation on an image.I am changing the image alpha to produce this effect.
I have used basic AlphaAnimation provided in android framework but found that its slowing down other animations. So i extended a class from SurfaceView and created a thread to update it. ( Again here, i am manipulating alpha of the image ).
Everything seems fine, except that i am not able to draw a transparent image onto SurfaceView.Its showing black color on the transparent areas of the bitmap.code...
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Aug 23, 2010
I have a SurfaceView that is being used to draw custom animations and I would like to overlay them onto a live-feed from the phone's camera. Currently, the SurfaceView that contains the animations has a white- background, but if I were to overlay them onto the phone's camera feed, they would have to be transparent. The camera and animation drawing cannot be done on the same SurfaceView. Is it possible to make a SurfaceView transparent? What is the best course to pursue the use of multiple views? My end goal is to essentially overlay the contents of another SurfaceView onto the Camera SurfaceView.
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Aug 23, 2010
I have a SurfaceView that is being used to draw images, and I would like to overlay them onto a live-feed from the phone's camera. Currently, the SurfaceView that contains the images have a white-background, but if I were to overlay them onto the phone's camera feed, they would have to be transparent. The camera and animation drawing cannot be done on the same SurfaceView. What is the best course to pursue the use of multiple views that involve managing the camera and drawing images? Is it possible to make a SurfaceView transparent?
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Oct 5, 2010
I am working on video renderer application which need surface and control of surface. And through isurface i can register heap buffer to that surface and post buffer operation. I have gone through android_view_surface.cpp file. It is having all required APIs which are helpful for my application. But i don't know how can i implement it. What are the procedures to get access of those APIs.
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Jan 14, 2010
What is most efficient way of keeping a check on time within a game thread? Currently I create a new Date() when the game starts and was thinking of creating another Date() within the game thread and comparing it with the first one. But with a screen refreshing at around 60fps (hence a new date object each time), I can't help thinking this is rather inefficient. What other ways are there of doing this?
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Nov 14, 2010
I am developing an Android app and I am doing some heavy work (bringing data from an online web page and parsing it to store in database) in a service. Currently, it is taking about 20+ mins and for this time my UI is stuck. I was thinking of using a thread in service so my UI doesn't get stuck but it is giving error.
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Jul 14, 2009
I'm a new Android developer. I would like to make a simple game using the SurfaceView (Canvas drawing).the game has a a custom Object name Box. Box can draw itself and need to get an event when it is clicked. when it does, there is an animation sequence coming out of the box like a "jumping clown". I have several Boxes on the screen when each of them can be activated. Several Boxes animation can also be presented simultaneously.Here it gets tricky: Since I have a "complicated" animation sequence, each Box extends SurfaceView. The problem is I haven't figured it out how can I handle several SurfaceView's drawing using only one Thread (in order to present an animation I need to use one) and also how can I get the onClick/ onThouch event from my Activity to each of my Boxes.
The LunarLanding example in the SDK uses only one Thread but also uses only one SurfaceView which manage the animation of the game components (there are no several game components SurfaceViews). Also, there is no need to get onTouch event, so this example doesn't match to my case. I have several questions about what is the right approach do code this:
1. Should I use Box extends SurfaceView?
2. Can SurfaceView gets user events like onTouch/onClick?
3. Is there a way to add to the "main" SurfaceView another SurfaceView (Box)?
4. If none of the above questions is positive, should I use one SurfaceView (and one Thread) and try to map the other Boxes on the screen for user event handling. I mean Box only paints itself but the user event is being handled by me (not by the OS).
5. Should each Box (SurfaceView) should handle it's own Thread in case of animation (it is not good design but it is also an option)?
6. do you have any other proposal?
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Aug 13, 2010
In my game when the user completes a stage, I want the main game thread to pause/sleep/wait and a new activity to be launched called StageClear that displays information about points scored etc. After this has been displayed and the user has pressed continue I want the original game thread to resume where it left off. I have tried to implement this but have so far been unsuccessful, probably because I'm new to dealing with multiple threads and also the idea of synchronizing them. I most recently tried to implement a shared package-visible object that could notify after wait was called on itself, but I am getting errors in eclipse so it won't even compile, I think because though the object is declared public in an inner class, it cannot be seen or recognised by my activity elsewhere in a file in the package. I have already built both activities but my issue is getting the main game one to launch the other, and pause whilst it waits for this activity to finish, before the main game thread continues execution.
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Mar 8, 2010
I have written a very simple game with some simple animations, but I've noticed that when the phone checks email, or several other apps are running, the animations that update in my thread start behaving slowly or choppy. This is a problem as the game mechanic requires some careful timing of your screen touches based on the animations. So if it starts behaving erratically, the game doesn't really work well - and isn't much fun.
Is there a way to prevent this? Can my threads have a higher priority when they need to run?
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Dec 8, 2009
I am getting the 'AudioTrack::start called from thread' when starting an AudioTrack. I am using it in a thread. I asume I shouldn't but why? I see it as a major limitation.
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Aug 1, 2009
The following code leads to "java.lang.IllegalThreadStateException: Thread already started." the second time it is run through on the program This happens the second time updateUI.start() is called. I've stepped through it multiple times and the thread is called and completely runs to completion before hitting updateUI.start(). Calling updateUI.run() avoids the error but causes the thread to run in the UI thread (the calling thread, as mentioned in other posts on SO), which is not what I want. Can a Thread be started only once? If so than what do I do if I want to run the thread again? This particular thread is doing some calculation in the background, if I don't do it in the thread than it's done in the UI thread and the user has an unreasonably long wait.
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Nov 24, 2010
I am new to Android and i have create some navigation base Application. now i Want to make some simple racing game so can anybody provide me tutorials for how to start developing?
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May 21, 2010
I'm new to game programming. But I've got an ide for what I think would be a fun game for the Android platform.
My question is, where do I start? Anyone got some good sites to recommend or perhaps a book or two. I've got medium skills when it come to programming but iv got a masters of science degree in computer engineering so I'm not totally unfamiliar with algorithms and stuff.
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Apr 8, 2010
I have a main class activity that does the task of sending control to other activities on click of a button. I am also starting a thread in the main class. This thread basically sets up a connection with the server and is active throughout the lifetime of the application.I have two functions in the thread class, send and receive data from server.Therefore, when the other activities need to send/receive data from server, they use those particular functions.First of all please let me know if what I am trying to do is fine as per the architecture of the operating system. If its fine, when I try to run the code, the app crashes and i see a NullPointerException and a RuntimeException in the DDMS log.Could some one please help me out in this or suggest a better way to implement the concept.Also, please be assured that, the other functionality of the code works perfectly fine.
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Feb 8, 2010
I am trying to start an error-reporting activty if unhandled exception detected. The problem is with exceptions thrown from main thread. Is there any way to start an activity if main thread crashed?
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May 21, 2009
I want to make simple game on Android. But i don't know the approach to start. So any 1 can help me from where i should start and which particular API (package).
I don't know nothing. So start with first step.
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Sep 15, 2010
I have an unlockable mode in my game that is only available once the story mode has been completed. This works perfectly if the story mode is completed during a test play through, because upon returning to the main menu the bonus mode is unlocked and selectable. However when I shut down the app and relaunch it, none of the previous state information is retained and it requires you to beat the story mode again to access the bonus mode.
I use the onSaveInstanceState method to create a bundle that stores this information (ie. a boolean whether the mode is unlocked or not), but this information seems to be lost between ending the app, and relaunching it. The onCreate method takes the parameter of a savedInstanceState but yet this seems to be null.
Is there a step that I'm missing out, or doing incorrectly somewhere along the line? On a PC game I would just serialize the state into a text file and look for a special string/symbol upon initialization but I cant do that here so i thought the outState bundle you create in SIS was how you retained information for use upon next launching the app again?
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Apr 1, 2012
i am trying to make a game for android but am finding it difficult. For my app i have made the menu screen, sound. But to make the actual game i am not sure where to start.I am not sure how to start making the game. I have seen some tutorials but they seem to be very confusing with all the coding.
I was wondering is there not some sort of graphical layout i can use to make the games a i did to create the buttons using the xml graphical layout in eclipse.It is for my final year project and i do not have much time left or i would have done it in flash.
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Jun 26, 2010
Can we start an official Rom thread that has the links to the Roms so we don't have to look through a bunch of crap to find them?
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Aug 28, 2009
I am seeing some weird issues and looking to see if anyone knows what is going on. I have a BroadcastReceiver which updates some views on receiving an event. Some psudo code is shown below. What happens is the function runs fine and the app seems to update the textviews BUT when i then try to clear the textviews parent and add new textviews the linearlayout(parent) blanks out and will now draw any of it's children.
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Oct 19, 2010
Curious to know the reason behind not allowing updating UI elements from background thread in Android. Will main thread does something more (probably interacting with framework) after updating the UI elements so that changes can be seen on the screen? Is it the same case with other GUI tool kits?
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Mar 3, 2009
My purpose is very simple : each 1second, I want to redraw an object on different place on background. I do not know where my error on this code below. Here is my code:
public class My_View extends View{ private Bitmap mBackground_img;
private Drawable mMoveObject; private int mObjectw,mObjecth; private int Dx,Dy;
private Handler myHandler = new Handler(); private long lasttime;
public My_View(Context context,AttributeSet ats,int ds) {
super(context,ats,ds); init(context);
} public My_View(Context context,AttributeSet ats) { super(context,ats);
init(context); } public My_View(Context context) { super(context);
init(context); } public void change() { invalidate();
} private void init(Context context) {
Resources res = context.getResources();
mMoveObject = res.getDrawable (R.drawable.lander_firing);
mBackground_img = BitmapFactory.decodeResource(res, R.drawable.my_pic);
mObjectw = mMoveObject.getIntrinsicWidth();
mObjecth = mMoveObject.getIntrinsicHeight();
Dx = Dy = 0; lasttime = System.currentTimeMillis() + 1000;
Thread mthread = new Thread(null,doBackground,"Background");
mthread.start(); } private Runnable doBackground = new Runnable() {
public void run() { long now = System.currentTimeMillis();
if(lasttime < now ) { Dx = Dx + 10; Dy = Dy + 10;
lasttime = now + 1000; myHandler.post(change_view);
} } }; private Runnable change_view = new Runnable() {
public void run() { change();
} };
@Override public void onDraw(Canvas canvas) {
canvas.drawBitmap(mBackground_img,0 ,0 , null);
mMoveObject.setBounds(Dx, Dy, Dx+mObjectw, Dy+mObjecth);
mMoveObject.draw(canvas);
} }
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