Android :: Drawable Object Where I Can Store Points For Faster Paint?
Aug 21, 2010
I'm designing a custom view which is an X/Y Plot. It's a moving graph that scrolls to the left with time and new Y values are continuously coming in at 10 per second.
I've been able to make it work with an array of integers where the array index is the X value and the integer value is the Y value, but this seems horribly inefficient (Because every time it comes time to re-paint, I have to loop 800+ times to paint the graph). Then we do it all again 10 times a second. yuck.
Can anybody think of a paintable object that I can draw points to and perform some kind of scroll transformation and then just draw the new points each time, rather than the whole canvas?
Any other ideas out there?
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Jul 1, 2009
I have to get the height of the text for i have specified the text size. is this possible? i need to get the width using the Paint object and without.
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Oct 15, 2009
There are several custom-made graphic objects (.png files) included in the project inside res/drawable map.
All elements are normally loaded and displayed in the user interface except two icons and so far haven't figured out what causes the problem.
The code which doesn't affect the user interface as it should is...
In both cases there is only ic_volume_small displayed on the screen and the Variables window in the IDE displays the following:
R.drawable.ic_volume_small = Class not
loaded : net.client.android.R$drawable
R.drawable.ic_volume_of_small = Class
not loaded :
net.client.android.R$drawable
The method (member of IconImage class) which should change the icon image is the following code...
Does anyone know what could cause the described problem?
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Nov 6, 2009
Or does it merely provide more options for graphics?
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Oct 18, 2010
How can i set the opacity of a Drawable object?
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Nov 26, 2009
In my application, user can click on a button and then he can select a picture from his gallery. This image is then displayed.
However, when the user performs 3 or 4 times this operation, the following exception is thrown, due to memory allocation problem code...
Here a sample of my code ...
Is it possible to force object (here the Drawable object) to be released from memory?
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Jun 12, 2010
I need to create a map with items on it (the map consists of a drawable object, which represents a room) and I thought about using buttons with background images for the items so that they are clickable.
I guess the AbsoluteLayout fits here the best, but unfortunately it's deprecated. What layout would you recommend me for this kind of application ? Is there another layout which supports X/Y coordinates ?
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Aug 23, 2010
I need to know how he takes drawable object. I'm collecting some ImageView objects in array, they have background images that are rather big in resolution so they take lot of memory...
I have read somewhere that it will automatically create image with resolution that my imageView have, so i think it will take less memory than first one. Please tell me, if i set scaleType property, will it scale that image? Will that help me to save memory?
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Aug 1, 2010
Is there anyway that I can store drawable into database?
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Oct 16, 2009
How we can store image files(*.png) to the folder R.drawable at runtime?
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Aug 7, 2009
Is it possible to store user defined objects in a SQLite database from Android? For example: I am creating one class and I want to store that class object in the database. Is it possible? If it is, how to proceed? On the Blackberry platform, I am able to store objects directly in persistent objects. Is it possible to do this with SQLite and Android?
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Jun 21, 2010
I have created a class with 3 sub classes in Java. The 3 sub classes contain variables to store information from my XML document. I am able to store in the first two for there are only single instances of the data in the XML. The third class contains variables that repeat multiple times. I want to store an object of "third class" objects. I also have a SAX parser class. I am doing this within an Android environment (1.6).
Does this make enough sense without displaying any code?
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Sep 10, 2010
I want to build a data structure in my application to store many entries indexed by keys. Each entry has several parameters to retrieve and update.
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Jul 11, 2010
In my Android project, I want to loop through the entire collection of Drawable resources. Normally, you can only retrieve a specific resource via its ID using something like:
InputStream is = Resources.getSystem().openRawResource(resourceId)
However, I want to get all Drawable resources where I won't know their ID's beforehand. Is there a collection I can loop through or perhaps a way to get the list of resource ID's given the resources in my project?
Or, is there a way for me in Java to extract all property values from the R.drawable static class?
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Oct 19, 2010
I am running my application in the emulator using a high density skin (like WVGA800). However the ressources in my application are loaded from the drawable- mdpi folder instead of drawable-hdpi ... what else should I do so that android use the correct folder ?
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Sep 9, 2009
I want to do some automated testcase with Instrumentation . Suggest that my AUT has 2 Activity. After clicking the button in ther first Activity, the second one will be shown with new content base on what we enter in the first Activity.) Instrumentation provides us the function called startActivitySync() and return the Activity object for processing. My question is how we can get the pointer of the second Activity after the it is shown by clicking the button on the first activity.?
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Jun 8, 2009
I would like to convert a Picture object to Bitmap object in memory, without writing data to disk.
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Sep 21, 2009
I have an Activity that running on system. I can get the Intent that is used to start the activity. But i don't know how to get the Activity object from the Intent object or something else. Can anyone tell me how to do this??? Note that, I don't use Instrumentation object.
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Oct 25, 2009
I have a problem with one of my app. I try to make a paint application but nothing is draw on the screen (except the first circle which is draw on the launch).The log Cat seems to be correct and i get the right x/y coordinates.I think i do something wrong on the ondraw.do you see my problem?
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Sep 14, 2010
I am trying to code an app where you can paint (Finger paint) free hand on a running video in a VideoView.I have the two things running separately but not together.I can draw my paint on a balance screen and i can play my video on my videoView, which is implementer in an xml layout.Is there a way to overlay the xml videoview View with an other View which can be drawable?
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Jan 12, 2010
I'd like to include a simple draw feature on my app. A friend told me I can't use canvas because I need to control the frame buffer and not redraw the entire screen every for every frame.He suggested I find a openGL 2d engine.I've searched around and I've only found Rokon which doesn't have any documentation and the examples aren't quite what I need.Any suggestions?
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Mar 29, 2010
Is there an app out there that lets you take a picture of your room with the camera,then preview different wall colors?
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Jun 17, 2010
Is it possible to change the unit for Paint.setTextSize?As far as I know,it's pixel but I like to set the text size in DIP for multiple screen support.
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Sep 8, 2010
I want to create a paint and update loop in android for game animation on a canvas but I am having trouble as I can't seem to get the threading to work appropriately. It seems to crash almost immediately.
Here is what I have tried:
CODE:................
Also when I drop the wait down lower it crashes faster. Is there a more appropriate way to approach this?
Changed to this:
CODE:........
This results in the same error...
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Aug 21, 2010
I'm new to Android and Java programming and I've manage to create a simple paint program, but how do I add a zoom feature? Right now I'm just extending the View class and using the "on Draw()" method. Do I have to use a Drawable to be able to add zooming functionality? I'm not really understanding the differences between the two. If I am way off base then please point me to a good tutorial on paint/zooming.
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Jun 2, 2010
My app uses a custom View that does a lot of text drawing.To ensure my text is always readable I've been using the result of calling getTextSize() on a newly-created Paint() instance as the minimum size. Docs say calling 'new Paint()' sets attributes like text size to default values.One of my European users just got a Motorola Milestone phone and reports that some text is unreadably small.I believe I've duplicated this using the WVGA854 skin in a 2.1 emulator.Run in that emulator my app's smallest TextViews look fine, but the text I'm drawing myself using Paint instances where I haven't changed the text size from the default is too small. I confirmed this by commenting out all setTextSize() calls in my View subclass: the text becomes too small to read comfortably.
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Nov 24, 2010
I'm looking for an application that will allow one to open an image (or pdf, preferably) of a worksheet and allow one to "do" that worksheet; in other words draw/write on the image/pdf.
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Apr 4, 2010
To explain i have a bitmap which is constructed as follows
Paint a rectangle color yellow I want now to paint a smaller circle over the top of the rectangle, but i want to use transparency. so that the circle results as a hole in the rectangle. {like swiss cheese with holes }
So if i painted the bitmap over a background the background would still be visible in the Circle/hole.
setting the drawcolor drawColor(Color.TRANSPARENT) just paints a transparent object. i.e. it doesn't erase the circle area of the rectangle.
How to do...?
One option is to set the circle color to say black and then look for an option to replace black with transparent within the bitmap.... but i can't find a solution for this either.
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Sep 28, 2010
I'm trying to develop an RPG for Android, so I need to paint a scenario where I'll move my character.
My idea is to do it 2D. I've developed 3D games and Java games for desktop, but in Android i don't get how to star the scenario.
Could it be developed with a matrix of information, so I could know where my character steps?
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Apr 3, 2012
The issue I am experiencing is that the SurfaceView I am using flickers. Once in a while, the objects I draw flicker and they change their size or colour.
It looks like that sometimes the application skips my calls to 'Paint.setColor()' and the one to 'Paint.setStrokeWidth()'.
I have made methods which change the used paint and then, in order to try to fix this issue, to set it back to the default paint values. Still the issue persists. I have also read that the problem might be due to the double buffering. Is it the case? I am using this code for the DrawingThread:
I also tried to use a dirty Rectangle to try to see if the issue can be fixed, but still nothing. [I might not have understood what it actually does.
Code:
class DrawingThread extends Thread {
private SurfaceHolder _surfaceHolder;
private CustomView _cv;
private boolean _run = false;
[Code] .....
I have read somewhere I should draw on a single bitmap and then draw the bitmap on the canvas. I have tried several times but I cannot manage to do so.
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