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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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..
is it possible to draw a 9-patch that tile its border instead of stretching it?
View 2 Replies View RelatedI tried enough to find in google & android this question. Also did several trials & errors, but couldn't get this question. was learning Android's "Draw Nine Patch" images. One basic I know is that, whatever image you process must be in .png format (if it's already in .9.png then it will be ignored by tool). However, couldn't understand what it literally means by "stretchable patches" ? what exactly happens when you draw black dots outside the .png image ? (preview pane shows changes happening, but I am unclear on how it makes those)When I draw black dots in left/top sides of image it shows some changes in preview; but why isn't there any effect when you do the same on right/bottom side of the image ? why this tool is used primarily for background, when we try to process on the image itself ?i am trying to modify a simple button.png (given in android sdk). Whenever I use this tool & draw black lines, it reduces the size of the image instead of 'stretching' it! Why ?What is the significance of options given below like, "show lock", "show content", "Patch scale" and so on ?I apologize for asking so many questions, but in Android online docs they haven't explained well for novice. If someone can answer these, it will become ready reference for all the begineers who search this forum.
View 2 Replies View RelatedI'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.
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.
View 1 Replies View RelatedMy 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.
View 5 Replies View RelatedI 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...
View 2 Replies View RelatedI 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?
View 1 Replies View RelatedI'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?
View 1 Replies View RelatedI 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);
View 2 Replies View RelatedFirst 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:........................
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..
View 1 Replies View RelatedI 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.
View 2 Replies View RelatedCan 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.
View 1 Replies View RelatedThere 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) ?
View 2 Replies View RelatedI 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;..............
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...
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?
View 1 Replies View RelatedI 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?
View 2 Replies View RelatedI 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?
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);.............
I try to implement a hover effect (effect when button is pressed) through putting a semi transparent PNG file on top of the button background and the button icon. Unfortunatly the button background file is a 9-PATCH-PNG which causes some trouble here: It "swallows" everything on top of its layer and doesn't allow to cover the stretchable areas (the fine light line around) of the nine-patch-png. In other words, the black lines the top and left edge of the 9 PATCH PNG cause not only stretching, but also padding behavior.
View 4 Replies View RelatedAndroid has a nice way of defining stretchable images called a nine-patch. See these docs for a description of the concept. The idea is to surround a png image with a 1-pixel border where you can define the stretchable areas and the padding dimensions of the image. This is absolutely brilliant and I'd like to use the idea in my iPhone app. Before writing my own nine-patch to UIImage loader I thought I'd see if one already exists. Google doesn't return any results so I don't have much hope, but it doesn't hurt to ask, right?
View 4 Replies View RelatedI want to know how can we create 9-patch images.
View 8 Replies View RelatedI wish to customize the button images, but after I opened the png file, changed the color, reimported back into the draw9patch editor, the compiler spew out errors. how can I modify the 9 patch image of the default button?
View 2 Replies View RelatedI'm trying to create on of these images, but Eclipse won't accept it once I've used the draw9patch tool. I've found other people having the same problem, and saw this comment: I discovered later that the problem I was having was caused by the image not being exactly true to the nine-patch spec as defined in the documentation. Once I fixed the image to have a clean (i.e., no gradients etc) one pixel border it was fine. "'m not much good when it comes to image design. What does this mean, how do I create my original png file to meet the specification for Nine Patch?
View 2 Replies View RelatedI have some 9-patch images on my app, and they work great on the medium density. When I load the app on a High density emulator/device, these images look grainy. It happens only to 9-patch images. The others look great after the pre- scaling. Is there a way to make them look good after the scaling, like the non-9-patch images?
View 10 Replies View RelatedCan someone please explain or provide examples (links) of some valid 9- patch files? From reading the API description, I think my understanding is flawed. As an example, there's a 9-patch located at: http://www.maladroid.net/test.9.png Code...
View 9 Replies View RelatedI am having problems with nine patch images ( **.9.png ). I have a widget layout and would like to use nine patch images for the widget's backgroud. Here is my background.xml...
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