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;
CODE:...........
137 is the magic number causing the error in my case, there may be more.
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Jul 28, 2010
I want to get the color of one pixel of screen
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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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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 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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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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Nov 1, 2010
I think I have a pretty easy problem to solve, but I have been beating my head against the wall for hours trying to get past it! I have an adapter that loads a list of URLS:
adapter=new MyAdapter(this, lStrings);
list.setAdapter(adapter);
The list of URLS looks like this:
private String[] lStrings={
"http://www.domain.com/file1.jpg",
"http://www.domain.com/file2.jpg",
"http://www.domain.com/file3.jpg",
};
What I want instead is to load these values from a text file that lies on the SD card. For that matter, I would be okay with loading the values from a text file into a String, and then load the String into the list as I imagine that would be the "cleaner approach". However, all attempts to do this have failed. For instance, I replaced the above snippet with this:
private String[] lStrings=
{ MainActivity.this.getString(R.string.myurllist) };
but then I get a Forced Close on loading.
I'm a bit new to Java, Android, and development in general.
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Apr 15, 2010
I want to refer to a static Java variable in my styles.xml, is that possible? Here's a pseudo-xml example:
<style name="Artwork">
<item name="android:background">@drawable/border_{Constants.MY_COLOR}</item>
</style>
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Jul 15, 2010
I defined a white color in mycolors.xml under res/values as below:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="my_white">#ffffffff</color>
</resources>
In my code, I set the text color of a TextView as the white color I defined:
TextView myText = (TextView) findViewById(R.id.my_text);
myText.setTextColor(R.color.my_white);
But the text in the TextView turned out to be a black color. When I use @color/my_white in layout xml files, it works fine. I check the generate R.java, and see: public static final int my_white=0x7f070025;
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Feb 11, 2009
I don't know where to put the bug report of APIs.
I use WebView to display some pages in my dictionary software. I met some problems with WebView.
1) could not handle the color values When I use the HTML code: <font color="#00FF00"></font> the WebView could not handle this type of tags. But <font color="red"></font> can work well.
This bug exist both in SDK1.0 & SDK1.1
2) Chinese Char: I use UTF-8 as the charset, and if there exist some Chinese chars, then this HTML code could not be displayed in WebView: <html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head> <body> <p><font color="red">[-------- 美国 统词典[双解] --------]</font></p> </body> </html>
This bug exists in SDK1.1.
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Aug 12, 2010
Say for example I have a textview in class A,
and I want to change background color of textview from class B through a method...
how can I do it?
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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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Jul 7, 2010
I'm creating a new class, using eclipse "New Java Class" dialog box. I can write the superclass I want (I can't find using "browse" button), but I can't write or select an interface to implement. I click "add" but ther is nothing to select. What I'm doing wrong?
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Jul 14, 2010
I'm just getting into Android development, and I have a question about communicating between a receiver class and an activity class. I'm very new to JAVA and Android so I hope I don't sound too stupid. I'm developing an application where I intercept an SMS message and then based on various elements of that SMS I might delete it once it's been saved to the inbox. I have a receiver class that intercepts the txt message, and I am also able to delete messages from my inbox with code in the activity class using a button at the moment. The problem I have is communicating between the receiver class and the activity class where the code to delete a message resides. I tried putting that code directly into the receiver class but as I'm sure most of you already know the BroadcastReceiver class doesn't seem to support what I need to delete messages. I've been searching for an answer to this for a while, but haven't been able to find anything. Honestly I'm not sure I know enough about JAVA and Android to even recognize a solution if I saw it.
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Jun 27, 2010
What I want to do, is be able to access the object neoApi inside the Neoseeker class, from its inner class RunningTimer. Now, in my code, you can see what I would think to work, but when I run my application, nothing pops up. Nothing inside my TextView, no Toast, nothing at all. How can I remedy this?
package com.neoseeker.android.app;
import java.util.Timer;
import java.util.TimerTask;
import org.json.JSONObject;
import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;.......................
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Sep 8, 2010
I'm new to Java and android development. In my application I need data which is accessible for a few activities. I've read that a good solution is to use Application class for this. So I use it like this:
public class MyApplication extends Application {
private String str;
public String getStr(){
return str;
}
public void setStr(String s){
str = s;
}
}
and I can access this variable from activity like this:........................................
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Oct 8, 2010
I have just started android. I just want to know that how can i call activity class from other java class. i just want to pass class object to activity class.
public class GsonParser extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
MagazineThread thread=new MagazineThread();
thread.start();
}
public GsonParser(JsonMagazineParser Obj)
{
}
}
and i am just doing like from other class. GsonParser obj=new GsonParser(this);passing obj to activity class.how can i achieve that.
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Apr 23, 2010
In my app in one package there are some classes. from those classes i want to run one class that is the Gps functionality class. i want to run that class in background. how i do it, i don't know. i am not able to make it solve from any document. if anybody knows the way to solve it please me by run a "hello world" app in the background. i am not able to solve this problem by going through document.
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Jul 20, 2010
I'm building a small Android application, but this is more of a Java question than an android question. Looking through the tutorials there are lines that look like: startService(new Intent(this, MyService.class));
What exactly does the "MyService.class" field represent? Is that just a reference to the class for a template?
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May 19, 2009
I made a Dialog Class with it's view classI want to pop up the dialog when I got some packets from network. so I made a Thread which parses packets and then I made if clause in Run() method There is no problem with parsing packet but when I enter "if clause" and call showDialog() I got Error message
Is there anyone who knows how to pop up a dialog from different thread?
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Jun 17, 2010
I need to set alternate color in list view rows but when i do that it removes/ disables the on focus default yellow background
I tried with backgroundColor
rowView.setBackgroundColor(SOME COLOR);
also with backgrounddrwable.
CODE:.........
But it wont work. is there any way we can set background color and on focus color simultaneously which will work.
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Apr 22, 2010
Is there any process to change the default text color white to "Black" and default selection color of android "orange" to "Blue" for whole project. i am using Eclipse for Android development.
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May 23, 2009
1. I want to use my own color for selecting ui views.
By default, android shows the selected view with background as orange. I want to show the view background color as red.
2. In the same way, I want the same behaviour should be applied to whole application.
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Mar 19, 2010
I have seen this example:
@*android:color/secondary_text_light
What's that * asterisk doing there? What is the difference when using or not?
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Aug 16, 2010
How to customize the color of the CheckMark color in android in a dialog. Currently , By default, the color of the checkmark is green by default. I would like to customize it to a different color of choice
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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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