Android :: Draw Canvas Using Blur Effect?
Dec 30, 2009
I need do draw on Android's Canvas using Blur effect, it is a very simple feature, I need to draw a circular area, which is blurred (the foreground) and the background transparent, I can do everything with manipulating the colour alpha to do it with custom transparency but I need it to be blurred instead of transparent..
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Jul 7, 2010
My loadMap() method generate a canvas.throwIfRecycled exception when i try to load a new map.
When i start the game, the initial map loads and work fine though,
its only when i try to load a new map that i get the exception ..
How can i "reset" canvas and the bitmap i use to draw into, so i can startover fresh with them ?
here's what i use to create and draw my maps:
CODE:.........
So basicaly once i created and used picDest and canvas, i cannot figure how to reset it all for when i want to load a new map..
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Feb 6, 2010
Can anyone point me to an example of how to blur a Canvas or Bitmap?
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Oct 28, 2010
I'm making an App that needs to be able to draw new graphics on top of the last set.
This is my current onDraw() method -
protected void onDraw(Canvas canvas) {
canvas.drawColor(Color.WHITE);
if(points.size() > 0) {
//do some stuff here - this is all working ok
canvas.drawLine(p1.x, p1.y, p2.x, p2.y, linePaint);
}
}
Basically, I need to draw the new graphics as a layer on top of the last, so what I'm looking for is a way to carry the image of the last canvas to the current. I have tried to figure it out myself using the canvas.setBitmap() method but it acts very funny.
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Oct 28, 2010
i'm trying to develop a simple pie chart class for android. For now, it can take a map of labels and values and draw the pie chart. I'm yet to add the legends for the pie, which is where i need to place the texts near small rectangles on the screen corner. Any help appreciated, since i'm new to Android dev.
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Sep 7, 2010
My requirement is to draw a line on canvas for every second. I am able to draw the line but its clearing the previously drawn lines when I call myview.invalidate(). Now my question is how to draw a new line retaining all the previously drawn line on the same canvas.
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May 26, 2009
I want to load an icon from resource and draw over it. But I cannot get it into a canvas. Can anyone please help me with the code below. If I uncomment c.drawColor(), I get blue color as expected. So the problem is on icon.draw(). code...
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Sep 28, 2010
I want to load e.g. LinearLayout with some Buttons from XML and draw it on Canvas in a way that the Views behave normally (I can set onClick actions for the Buttons and when I press a Button, it changes it's background drawable). Can I do this?
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Jan 24, 2010
I'm trying to draw a nine patch onto a Canvas object on the Android. What seems strange is that although I generated my nine patch using the draw9patch tool, the constructor for NinePatch requires an additional byte array called the "chunk" to construct the nine patch. Why isn't this simpler? What is the "chunk"? And if you have done this yourself, how did you go about it?
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Oct 26, 2010
I'm porting an app written in a graphics environment that allows drawing to happen outside the bounds of the clipping rectangle. Any way to do this in Android?
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Apr 12, 2012
I need to create the slice effect just like the one in Fruit Ninja. How to do that?
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Feb 4, 2010
I have figured out the static layout this far, but I have no idea how to make it display my text anywhere else but in the top left corner. StaticLayout layout = new StaticLayout(text, getTextPaint(), 140, android.text.Layout.Alignment.ALIGN_CENTER,(float)1.0, (float)0.0, true); layout.draw(canvas);
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Jan 18, 2010
First I want to say that I have read many articles on this subject in this forum and on some external resources(very helpful was Robert Green's diary at www.rbgrn.net and www.droidnova.com).
However, despite all of this I want to start topic regarding FPS, and ask for advice from experienced game developers on Android platform.
My main question is "How to improve FPS when draw on Canvas?"
I have implemented simple 2D arcade game skeleton for testing purpose. Now I have ~20 FPS and want to increase this value to 40-50 FPS, if this is possible of course. I know about Open GL ES, but so far I am interested in Canvas.
In every frame I draw following stuff on the screen: - Canvas.drawColor(Color.BLACK) - to clear the screen - 1 spaceship PNG 24x24 image 1.25 kb - 5 asteroids PNG 64x64 image ~8 kb each - from 1 to 30 bullets PNG 8x8 image 299 b - 4 30x30 Rectangles - to control objects on the screen
After running my app, in logcat I can see following output data: - Average FPS: 20 (Total frames drawn: 1945 in 97 seconds) - Average onDraw: 32 ms (clear canvas: 3, draw game stuff: 26, draw controls: 1) - Average updatePhysics: 1 ms
From this output I can assume, that my main problem here is "draw game stuff" wich includes: - draw 1 spaceship - draw 5 asteroids - draw from 1 to 30 bullets
Here is my code:........................
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Jun 28, 2010
I want to draw hands on the canvas which is smooth and closed arc. How can I draw it? Any code regarding graphics or reference class to draw it will be helpful.
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Sep 16, 2010
Can anybody tell me or send me some links if there is any..which tells how Google map draw on canvas in android. what is the logic behind that.
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Oct 11, 2010
There is no problem with portrait mode but when i try my app on landscape mode it doesn't look how it should.What is general approach to solve this problem.My first idea is replacing X and Y places.If i am on the right track how should i do this ? Should i use an if statement at the beginning of the onDraw() function and write entire same code twice (one for x,y and other is for y,x) ?
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Aug 7, 2010
I am very new to android development and have been trying to draw a square comprised of multiple smaller rectangles of different colours... Like a Mosaic essentially. Basically at the moment I am reading values from a file which assigns the colour to the smaller Rects. I am using a pair of nested for loops to try to draw the small Rects sequentially, line by line. However when the program finishes there is only one small Rect drawn which is the last one to be drawn and its colour corresponds to the first value read from the file. Here is some of my code to show you what I mean:
public SnapshotDraw(Context context) {
super(context);
for(int a = 0; a < 63; a++){
for(int b = 0; b < 63; b++){
fileName = PREFIX + "2" + EXTENSION;..............
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Sep 29, 2010
How can i draw a view on a canvas by giving the x,y position in the canvas.
For example,
I have custom view myView, which was created by inflating one of my layout.xml file.
Now i want to draw this myView on the canvas at position (x, y).
How can i do that? code...
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Mar 25, 2010
I want to draw a bitmap on a canvas with bigger size than it is. I can use canvas.drawBitmap(bitmap, null, destRect, null); but that gives a poor quality, as the result is pixelated, if the source image is sightly smaller than the destination rectangle. How can i draw my bitmap using bilinear or bicubic resampling?
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Mar 17, 2010
I have a Bitmap object and want to render it to a Canvas object with varying levels of translucency (i.e. make the whole bitmap partially see through). For example, I have sprites in a game (that are drawn over the top of a bitmap background) that I want to fade out from being opaque to being invisible. Can I do this without having to resort to OpenGL?
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Jun 15, 2010
I currently have a game written using the Android canvas. It is completely 2D, and I draw bitmaps as sprites on the canvas, and it technically works, but I have a few features that I need to add that will require drawing many more bitmaps on the screen, and there will be a lot more movement.
The app needs more power.
What is the best way to go from this method of drawing Bitmaps on a canvas to using OpenGL so I can draw them faster?
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Mar 30, 2010
i just noticed this with my camera a few days ago. I like to use my Eris's camera a LOT (its a decent camera!) but am now disappointed that there is a reddish blur in the center of all photos. It is very noticeable on white backgrounds in medium to low light conditions. does anyone have any info? i rooted my phone and am still in the 30 day period, i have insurance too.
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Sep 5, 2010
In my android application I use this method in "draw" Overlay class for draw route on map. Can someone tell me if this method is good (in terms of performance) for route draw on map or I must to put code in Thread ??
I'm new to android.
public synchronized void draw(Canvas canvas, MapView mapView, boolean shadow) {
if (pointsAndTimes.isEmpty()) {
return;
}
Projection projection = mapView.getProjection();
Paint paint = new Paint();
paint.setARGB(250, 255, 0, 0);.............
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Jul 6, 2009
I have a camera application that captures an image and saves it in the sd card.I want to blur the image now.I need to design a simple blur filter,I have no idea how I can do it in android.I can not find any examples anywhere.Can someone tell me the basic steps to blur an image in android?
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Jan 14, 2010
Currently in an Android application that I'm developing I'm looping through the pixels of an image to blur it. This takes about 30 seconds on a 640x480 image.While browsing apps in the Android Market I came across one that includes a blur feature and their blur is very fast (like 5 seconds) so they must be using a different method of blurring.Anyone know a faster way other than looping through the pixels?
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Jul 11, 2010
I would like to be able to either blur or dim the background when I show my popupwindow using popup.showAtLocation, and unblur/dim the background when popup.dismiss is called.
I have tried applying layout params FLAG_BLUR_BEHIND and FLAG_DIM_BEHIND to my activity, and this appears to just blur and dim the background as soon my app is started.
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Sep 28, 2013
Is it possible to have something like this on Android? In the form of a CM theme.
SGH-T999
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Jun 2, 2009
I can't seem to get the BlurMaskFilter to work the way I want. When I set a BlurMaskFilter as part of my Paint object and then draw a bitmap only the edges of the bitmap are blurred. Is there some secret way of blurring the entire bitmap? I noticed there's not really any sample code in the demo app or anywhere else on the web that I can find and the java docs for this class are sparse to say the least.
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Sep 1, 2010
I was wondering if anyone could help me make my decision between the HTC Incredible, the Droid 2 and the Droid X. I'm leaning towards the Droid X at this point over the Droid 2, because the physical keyboard seems superfluous. I type much more quickly on my iPod Touch than I do on my phone, which has a physical qwerty on it. I'm hoping Swype and a bigger screen will make it even better. For that reason, the Droid 2 is kind of a long shot, in my opinion.
Alas, it's mostly down to the X and the Incredible. After having read up on the specs of both rather extensively for the past few weeks (I'll have money to kill my AT&T contract and get on with Verizon sometime this month), the only thing I haven't been able to research very well is Sense versus the stripped-down version of Blur on the phones.
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Nov 1, 2010
What would be my best choice if want a ROM with Blur, right now I'm running Rubi X Blurry 0.3 Any other suggestions ?
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