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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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..
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.
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 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 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?
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 use Google Voice for all SMS notifications. I use the Gmail application for my email.Does anyone know of an application that will vibrate my phone at a certain interval, e.g., every 2 minutes, until I actually open my phone and acknowledge that I've received the notification?I would LOVE THIS! I used to have a phone that did this and it came in handy. I find that my Incredible's vibrations are a little light, and I often miss important texts when it's on vibrate.
View 18 Replies View RelatedI have the following problem: when i try to play a sound over and over again, it sometimes (actually most times) is not played.the documentation says that one should use the media player in the following sequence if a sound should be played several times: is this the wrong approach? is there a more performant way to reset the pointer in the sound sample so that it can be played from the beginning? i tried using mediaPlayer.seekTo(0); but it didn't help. Code...
View 2 Replies View RelatedI am adding a proximity Alert with an expiration of -1 (does not expire). I am testing using an Evo. The proximity Alert fires several times after entering the location and staying inside the location. I was thinking that the proximity alert should fire once when you enter the location and fire once when you exit the location. Should the proximity alert fire multiple times after you enter the location and stay inside of the location?
View 2 Replies View RelatedI am developing an app where a single activity is instantiated multiple times by itself. I guess you could think of it like a book where each activity is a page. At the end of the page (activity) the user presses a button to go to a new page. I fire off an Intent for the same Activity, but I push different data into the Bundle so that a different page is loaded. This works fine, and I like the fact that the user can back up to a previous point, but my question is whether this will eventually be a problem? What happens if this activity is instantiated 10 times, or 50, or 100? Will the device run out of memory, will GC come along and clean up old activities, or what? If GC does clean them up, what happens when the user presses Back and the previous Activity is no longer on the stack? Is it better to keep track of the user's path, finish() the activity, and override the Back button so that whether the user is moving forward or backwards, I only load a single Activity? Another approach I could take is to refresh all the data on the page so that it's still the same activity, but with new data. The Back button would not work as expected in this case.
View 2 Replies View RelatedIn my android app, I'm setting an alarm that I want to occur repeatedly, hence using AlarmManager.setRepeating().
I don't want to keep track of whether the alarm is set myself (sounds like a bad idea that's prone to fail at some point), and there seems to be no API support for checking whether a particular alarm is already set for a given Intent.
Hence, I am pessimistically resetting the alarm each time my app activates:
alarmManager.cancel(pendingIntent);
...
alarmManager.setRepeating(..., pendingIntent);
Question: is calling setRepeating() idempotent i.e. do I need to explicitly cancel() any prior alarm or can I safely just call setRepeating() and be done with it?
I just started using Tasker on my Droid X and have found it to be very useful. I have had a problem with a Profile that I built around Google Maps. After reading about a GPS bug on Droid X (I believe the same issue happens with WiFi, but it not relevant here) I created a profile that turns on GPS when Maps is started and turns off GPS on exit. In order to verify the on/off tasks are being doing at the correct times, I added a popup to the end of the on/off tasks. If this worked as I thought it would, I should see the popup happen after launching Maps and I should also see it when Maps closes: So after setting this profile up in Tasker and launching Maps, I see maps open and the GPS on popup appear, but after a few seconds, the GPS off popup appears. After a few seconds, the GPS on popup appears and the GPS off popup apear again. This repeats for as long as I have the Maps app open. Maybe this has something to do with how Google Maps launches/works/exits, but I'm at a loss here. Does anyone have any ideas why this is happening?
View 5 Replies View Relatedokay so i downloaded skype mobile and it download but got stuck on the installing screen so i turned the phone off and back on and now it just is stuck in this endless loop of turning off and on. i tried holding down the volume up key while pressing the end call button to do a reset and it just says "cache error". any ideas? maybe skype gave me a virus?
View 18 Replies View RelatedAll of a sudden going into "handle programs" in settings on my HTC Desire force closes com.android.settings. BAM! I've tried rebooting several times, no difference. Even tried uninstalling the last application I installed but it still force closes. Now uninstalling through the market works fine, so it does through the astro program handler, but why does my core settings app all of a sudden crash bigtime?I've not rooted the device and I don't have much fishy stuff on it, the most fishy thing I guess is the HTC IME modded keyboard from jonasl that adds the microphone button and a milllion other neafty tricks. I'm not sure if this started happening then or later.
View 2 Replies View Relatedmy htc sensation shut down yesterday, and as yet I have been unable to get it on, the battery itself was still sitting at about 15%. When I plug the phone into the wall or computer the orange led flashes slowly. When I attempt to turn the phone on it vibrates repeatedly as if trying to boot, but nothing appears on the screen. I have tried to jump start the phone, hard reboot, bootload through the pc but nothing seems to be happening. I need my phone urgently as my wife is due to give birth anyday now, and she needs to be able to contact me at work.
View 1 Replies View RelatedI am on my third exchanged phone for a variety of reasons I have a 41/09 device that is repeatedly crashing whenever I try to compose an email with the native gmail app.I have duplicated it over and over again. There is a lot of debate as to whether these crashing phones are experiencing a hardware or a software problem.This seems like a software problem, and could be related to how the new 2.0 OS deals with memory, etc.I would like to think that an software update would fix it.There is no doubt that Verizon and Google are aware of the high number of phones that crash software.I bought my phone at Walmart, and they are about done with my replacement requests. My store and the next closest store who sells Verizon is out of the Droid.
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