Android :: Faster Way To Set A (PNG) Bitmap Color Instead Of Pixel By Pixel
Nov 22, 2010
I have some png files that I am applying a color to. The color changes depending on a user selection. I change the color via 3 RGB values set from another method. The png files are a random shape with full transparency outside the shape. I don't want to modify the transparency, only the RGB value. Currently, I'm setting the RGB values pixel by pixel (see code below).I've come to realize this is incredibly slow and possibly just not efficient enough do in an application. Is there a better way I could do this? Here is what I am currently doing. You can see that the pixel array is enormous for an image that takes up a decent part of the screen
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Jul 28, 2010
I want to get the color of one pixel of screen
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Nov 9, 2010
I want each pixel on the screen to flash between red, blue, green, white, and black but independently of each other. Is this possible? I have been searching everywhere with out any luck. Any help on where to start would be greatly appreciated.
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May 22, 2009
Before I submit this I just wanted to check it's not a java nuiance.
The Color class can be used to extract rgb values from a pixel (32 bit int).
I implemented a lookup table filter and used a byte to store each individual r g & b value to save a bit of space.
Long story short;
CODE:...........
137 is the magic number causing the error in my case, there may be more.
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Jun 16, 2009
How can I get Pixel color of a coordinate? There is no method like canvas.getColor(x,y).
Actually, I am new to game developement. I am developing a Game which will restrict object if it comes to that boundary like in pac-man. How can I check that object has reached upto the boundary?
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Jul 14, 2010
I'm not even concerned with the camera per se. I want at the closest thing to the display screen. Meaning: it could even be the desktop the user is looking at, completw w/ the background and the icons she moves back and forth.
Let's say, at time t=1 sec, the app goes to pixel (78, 300) on that display and obtains its value. What may be at (78, 300) could be a portion of the icon or some speck of tree leaf on the photo being used as desktop background.
I'm familiar with BitmapFactory.decodeFile() for getting at the pixel contents of a file. But what about the display?
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Aug 24, 2009
I am new to Android and OpenGL world. I've created a new ap using openGL ES. The package is attached with this mail. Android Simulator LCD size is 320 x 455 and i've set same size for OpenGL Viewport. But For creating visible rectangle i've to use vertices, which are of very high value.
E.g.
CODE:.....................
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Jun 24, 2010
File file = new File(fileName);
Iterator iter = ImageIO.getImageReadersByFormatName("Reader");
ImageReader reader = (ImageReader) iter.next();
ImageReadParam param= reader.getDefaultReadParam();
ImageInputStream iis = ImageIO.createImageInputStream(myFile);
reader.setInput(iis, false);
BufferedImage myJpegImage = reader.read(0, param);
How can i write equivalent codes for above codes on Android? Are there any hints how to read pixel data?
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Nov 26, 2009
I am looking at the source code of a Camera Preview application and learning that the preview buffers coming from the sensor is in YUV422 format. However, this preview frame is showed on the display in RGB. Can someone please let me know where the pixel format conversion happens? Is it inside Surface Flinger? If yes, can you please point me to the code?
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Apr 12, 2010
I need to know how many pixels wide and tall the screen is. I know that there are a bunch of different localization folders that I could make for different views but I just need to know, programmatically, how many pixels are on the screen so I can do some drawing. How can I detect this?
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Jun 30, 2010
I got my evo last Friday and I have noticed a dead pixel. It's on the e key when the keyboard is up and can only be seen on a white screen. My question is should I exchange it or is one dead pixel nothing to worry about? It looks like a little purple or red speck.
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Aug 27, 2010
I'm doing visual design for an Android App supporting WVGA.What should the pixel width and height in Photoshop be?Does it have to be 480x800? Or can I still design in 320x480?
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Oct 9, 2009
How do I run the emulator with WVGA854 skin so I get a 1-1 mapping of device to screen pixels? The WVGA854/layout file has "width 480 height 854" but when I run the emulator, I get these values for DeviceMetrics: density = 1.5 densityDpi = 240 scaledDensity = 1.5 heightPixels = 569 widthPixels = 320 xdpi = 240.0 ydpi = 240.0 I'd like to run the emulator so that I see heightPixels/widthPixels values of 854/480 in the code. I tried playing with the -dpi-device option but doesn't seem to help.
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Aug 2, 2010
When I develop an Android map application, I want to draw a circle on the map whose radius is 1 meter. As you known, I can't draw 1 meter directly, I should convert 1 meter to the distance of two pixels depend on the zoom level. How to I convert it, is there anything API I can use.
Canvas.draw(x, y, radius), what value should I put to this method ?
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Jul 21, 2010
I am working on a little side project (program for Android platform)and I don't exactly have a problem, but I don't really know where to start. The project I am working on has to do with getting the info and manipulating a pixel's RGB values inside an image. I know this is a very basic program (not going to disclose all the information about the project), but I am a beginning android programmer.
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Jul 9, 2010
I'm currently writing an Android game using surfaceView. I've optimized the game as much as possible and it runs quite smoothly. However, I have collision detection incorporated which is a bit messy. I would like to do collision detection by reading pixels directly from the canvas. Is this possible to do? The closest to this that I have found was to attach a new bitmap to the canvas using setBitmap. Then when I drew to the canvas, the bitmap would be updated. Would this be the way to go?
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Jun 8, 2010
So when I bought the Evo, the first unit had a crack on the bottom of the LCD, then I got a replacement that same day and it had a dead pixel. Sprint said they couldn't exchange three in one day, so they said they will call me when my replacement unit comes in, but I want to know if there is anyway to fix this one dead pixel?
This is a dead pixel, not a stuck one. I can only see it on a white background and its a black dot. Any thoughts?
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Feb 28, 2009
I'm being confused by the 'screen density' concept in Android. I knwe that dpi (dot per inch) came from the printing device. 160 dpi means 160 dots in every inch on the paper. However, when dpi is used for the screen density, for example, what's mentioned '160 dpi screen' in Android document, what's the meaning? 160 pixels on every inch of the display?
As described in http://code.google.com/intl/zh-CN/android/reference/available-resourc..., 1 dip (density-independent pixel) means 1 pixel on a 160 dpi screen. Why does the ratio of dp-to-pixel not necessarily change with the screen density in direct proportion?
When the dpi is changed from 160 to 80, how many pixels will 1dp will take? 0.5?
I can hardly understand why dip/dp is introduced into Android.
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Apr 10, 2009
After some search, even in the WebView and related classes source code, I could not find where the built-in 8-pixel inner margin of a WebView is set. I would like to display a WebView with no inner margin: is it feasible, please? Or am I missing something and there is no top and left inner margin inside a WebView?
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Jul 16, 2010
This might be really nit picky but there's a dead pixel on my screen and it's very obvious when I surf the web with the white background. I'm coming from the iPhone apple would replace the phone..do you think verizon would or should I just suck it up?
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Aug 31, 2010
Do you have a dead pixel? Are you living with it?
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Nov 9, 2009
I got my new Moto Droid on the day of release, which so far I absolutely love. However, I just looked at it and noticed that there was a single dead pixel in the top left corner. I wouldn't have even noticed it had it not been on the gray background of the top status bar the rest of my wall paper is black so it would've been easy to miss.Has anyone else experience dead pixel(s) on their new phone? I'm going to try to get it swapped out this afternoon which I think they should do. It just makes me mad that I have too.
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Mar 31, 2010
My desire is fantastic, was delivered when they said it would be and all the staff I've dealt with have been fab. The only gutting thing was that my desire had a stuck red pixel in the middle of the screen that was visible on any white background like a web page or the dialer. It is small but it is annoying so I decided to phone up T-Mobile. Amazingly they have arranged for a swap to happen tomorrow. Can't fault them at all.
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May 29, 2010
My poor Desire appears to have 1 dead pixel. I can't see any others. Would you accept this? I am tempted to take it back and get a replacement, but I am worried that the replacement might have more? I have always been unlucky with dead pixels.
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Jun 9, 2010
A lot of hay is being made over the iPhone4's 326 ppi screen density. I was just curious, for comparison purposes, what's the pixel density of the Evo screen? This would be an easy calculation to do if I knew what the horizontal and vertical dimensions of the screen were, but I can't seem to find that information anywhere.
If anyone knows the pixel density or even just the exact X and Y dimensions of the screen..
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Sep 16, 2010
I got a dead pixel, this will be #4. I am thinking about switching phones.
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Nov 9, 2010
8 days into my new Evo and I have a stuck pixel... I ran JScreenFix for 30minutes and the pixel is still stuck on green(persistent punk). I'm running it again for a longer period of time and hoping it works out well. I wouldn't mind as much but the pixel is ~1cm off center. It's irritating as heck. Has anyone been able to fix a stuck pixel? Methods?
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Jun 4, 2010
Noticed a single stuck red pixel on my screen... was so excited about the phone that I didn't wanna return it and have to wait a few days for a replacement since all the radioshacks around my area are sold out.
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Oct 10, 2011
As title, i need a function that returns the pixel that i'm touching...
for example i have an image in background and i want that, if i keep touching a point for a little bit, it appears a menu where i can do something on that exact position like adding a draw on the picture in background...
already exists a function like that?
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Oct 28, 2009
Well, I did this on my phone and noticed I had a lot of dead pix. Here is how you do it:
1. Go to the your backlight setting and turn it up to 100. MENU>Setting>Sound & Display>Brightness You have to disable the auto blacklight first.
2. Launch you camera app
3. Hold your finger over the camera lens and count the dead pixels
I was disappointed to actually see so many. You really don't notice them during normal. Unfortunately for me, Best Buy has a cap on Sprint phones (only able to exchange 3) returned and exchanged. I have to take mines to a authorized Sprint repair store.Does anyone else have dead pixels?
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