Android :: How To Obtain Pixel's Rgb Values In An Image

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.

Android :: How to obtain pixel's rgb values in an image

Android :: Way To Get Pixel Values From Droid Canvas

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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Android :: Color Class Can Be Used To Extract Rgb Values From A Pixel - 32 Bit Int

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;


137 is the magic number causing the error in my case, there may be more.

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Android :: Can't Get Values Of Columns / Obtain Emails?

Jan 13, 2010

I am trying to get the emails from a contact on Android (2.0.1). I canīt get the email. The code...

When I try to get the values of the columns, I get null. How can I obtain the emails? Maybe the CONTENT_URI is not correct or the data is stored in another table and I have to make a join.

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Android :: Get Pixel Color Values Of Canvas / How To Check That Object Reached Upto Boundary

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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Android :: Possible To Obtain ID Of An Image By Id Of Thumbnails?

Jun 25, 2010

I'm developing an image editor for android. In the main activity, I get to show all images by viewing the thumbnails to make the process faster. The problem it's that I need to process the image later and I would get the normal image ID (with the original size, which I think is in MediaStore.Images.Media). I can't get the form of the query. The code that I have is the following but I can't obtain the real image ID (in the IDImage variable) code...

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How To Get Grayscale Pixel Data From Image Or Preview

May 8, 2013

What I am needing is a method to get grayscale pixel data from an image or preview. I am not interested in saving the picture as a jpeg etc, just need the grayscale data.

I am aiming at API 10 (as this is the device available for testing).

On top of this, I am not having any luck getting the camera to work on the Eclipse emulator.

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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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General :: How To Edit Default Values Of Memory Min-free Values Of Rom Reside

Apr 9, 2014

I want to ask where does the defaults values of memory min-free values of a Rom reside? I mean what file I would have to edit to edit those values?

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Android :: Reverse Image Load Order - Loading Animation In A Image View While The Real Image Is Loaded?

Jul 21, 2010

I use to load images in a ListView and a GridView. It works but the images are loaded form bpttom to top. How to fix that?

Bonus Question: Can I use a loading animation in a image view while the real image is loaded? Right now it's just a default image.

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Android :: Get Pixel Value From Display?

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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Android :: OpenGL ES Pixel ?

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.



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Android :: How To Read Pixel Data?

Jun 24, 2010

File file = new File(fileName);
Iterator iter = ImageIO.getImageReadersByFormatName("Reader");
ImageReader reader = (ImageReader);
ImageReadParam param= reader.getDefaultReadParam();
ImageInputStream iis = ImageIO.createImageInputStream(myFile);
reader.setInput(iis, false);
BufferedImage myJpegImage =, 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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Android :: Pixel Format Conversion In SF

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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Android :: Screen Pixel Size

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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Android :: Extract Color Of A Pixel Of Screen

Jul 28, 2010

I want to get the color of one pixel of screen

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Android :: What Should Pixel Width And Height In Photoshop?

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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Android :: How To Run Emulator To Get 1-1 Pixel Mapping With WVGA854

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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Android :: Change 1 Meter To Pixel Distance / API I Can Use?

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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Android :: Want To Obtain A Virgin Map

Jul 11, 2009

Is there a way to obtain a virgin map with the Google Map Api or other API (no city and country names, i want only country borders)?

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Android :: What Is Radio Image / Flash Image / System Image?

Dec 7, 2009

It will be helpful if any one can help me out in understanding the concept of radio,flash,system image in android mobile device. Also why are they required? and what is their role in Device?

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Android :: Randomly Change The Color Of Every Pixel On The Screen

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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Android :: What Ratio Of Dp-to-pixel Change With Screen Density?

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, 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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Android :: How To Remove WebView Top Left 8-pixel Inner Margin

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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Android :: Obtain GPS Location Once Every Few Minutes

Aug 23, 2010

I would like to write an app on Android to upload my GPS location to an external website once every 5 minutes. This needs to have as minimal an impact on battery life as possible, but it also needs to work without any user interaction. (Background: I'm competing in an Ironman triathlon which will take me about 14 hours to complete, and want to broadcast my location in near-real-time but without having to worry about fiddling with my phone.) So my initial thought is to write a Service which uses LocationManager.requestLocationUpdates() with a minTime of 5 minutes, but will this actually wake the device up every 5 minutes for my service to do its job?

It sounds like I would also need to use AlarmManager.setInexactRepeating() to make sure my service is awake while it completes its task but how does that play with requestLocationUpdates()? Should I instead set minTime=0 on requestLocationUpdates() but then go back to sleep as soon as the next update is obtained? Any general guidance on how to design this. I'm a competent Java programmer & will be using Google Maps on the server to plot my location, but am pretty new to Android development so I'm basically looking for a high-level plan on how to architect the client app.

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Android :: Obtain An Instance Of ServiceState

Jun 26, 2010

I'm trying to obtain an instance of ServiceState in my Activity. But how am i supposed to do this? There is no static method to obtain an instance or any method on any service that returns an ServiceState instance.
There is the TelephonyManager.listen() call. But i want to get the ServiceState instance when i want, not when android calls my listener because something changed.

The documentation of ServiceState can be found here:

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Android :: How To Obtain Frequency From Mic On Phone?

Jun 9, 2009

I wish to obtain the frequency of an input signal from the mic. Can anyone send me some pointers on how this may be accomplished.

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Android :: Trying To Obtain Battery Temperature

Jan 18, 2010

I'm trying to obtain the battery temperature, the battery voltage and the battery current. The return value of the code (see below) for voltage and batteryTemperature is always 0 while the others work. I would like to know if there's any other way of obtaining this information and how. Finally, I couldn't find anything in the API for accessing the battery current... Is there any method to know its value? Code...

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Android :: Can I Obtain Resources With A Given Locale

Jul 28, 2009

I have different text packaged into my app for different locale. The Resource.getString(int resid) method automatically returns me the string for the CURRENT locale of the phone. Is there a way I can specifically obtain resources while passing in a locale? For example, there isn't such method as: Resource.getString(int resId, Locale myLocale);

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Android :: Do I Obtain Droid_id Of A Device?

Jul 28, 2010

In the licensing documentation the android developers mention an easy way to more or less securely identify an android device. They are using android.Settings.Secure.ANDROID_ID.

They say they query the system settings for this. But they don't explain this any further.

How do I obtain the android_id and do I need special permissions for doing so?

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