so basically, i'm new to java and android studio. I know the basics but I'm not that good yet.
I get this error when I try to run an the app on my phone. Going through other threads didn't help me either as I basically have just one background image in the MainActivity. I have to add one more but when I do it and try to run the app, it crashes.
size of background image: 115kb
size of the image I still have to add: 164 KB (tried to compress it to 74Kb, didn't work.)
java.lang.RuntimeException: Canvas: trying to draw too large(430377192bytes) bitmap.
I saw this in another thread which was supposed to be put in the manifest which hasn't helped either:
android:largeHeap="true"
I hope I have provided enough information needed to answer the question, if you need more please tell me.
Again: I am new to this.
430377192 bytes is the equivalent of a 10372 x 10372 pixel image. This is much too large. Moreover, it is far larger than any Android device screen that you are ever likely to encounter.
So, find this drawable resource, and reduce its resolution to something more reasonable.
If you placed this drawable resource in res/drawable/, please understand that res/drawable/ is a synonym for res/drawable-mdpi/, representing images designed for -mdpi screens (~160 dpi). Those images will be upsampled to higher resolutions on higher-density screens (e.g., double along each axis for -xhdpi screens). Either prepare dedicated drawables for appropriate densities, or move this image into res/drawable-nodpi/.
Related
So I am doing small game in android studio - java. And I was using 400x400 .png image as a ship. It worked well.
Bitmap.createScaledBitmap(BitmapFactory.decodeResource(context.getResources(),R.drawable.playermove),(int)(length),(int)(height),false);
I am using drawBitmap to draw image on screen.
Now I want to use different ship. Only thing that I changed is that instead of this image I use another one that is 150x150 also .png and game becomes so laggy and sloopy.
Length and Height are 1/10 size of the screen. I have 8 ship pictures with similair dimensions and every one make game sloppy.
Any idea why those pictures make everything sloppy and first one doesn't?
You are doing that on the UI thread. You shouldn't!
I'd recommend not to scale Bitmap dynamically, as bitmap scaling is bit expensive, and if you are doing that in onDraw() which would be triggered every ~17ms, doing redundant/expensive work is bad. I'd suggest you to preprocess the image and keep a scaled version of it and just use it to draw every time.
you are not optimizing your images and this is a background work. try to do this in background.
also this post may help you.
I'm currently working on an application where I at one point want to open an Activity that has a transparent background so that I can see the activity below it. This was simple enough and I solved it quick. However, now I want to also add some kind of blur filter so that the activity below my activity seems blurred out.
I have searched around and tried several different solutions but with no luck so I'm trying to add this as a question. Does anyone know of any good way to solve this?
Thanks
There are plenty of libraries that do this. Here's one list of them. Personally I've used BlurView (I hope linking to one of the libraries is not against site rules) but I've had to patch the library a bit, see this issue - the pull request is not in yet. I've also had performance issues with animations.
Basically all the libraries do the same things:
Create Canvas for a Bitmap, with scaled down dimensions (e.g. 4 times smaller), set the transformation matrix to apply this scaling
Render the background of the window to Canvas
Render the root view of the Activity to the Canvas
Blur the Canvas's Bitmap using ScriptIntrinsicBlur
Draw the Bitmap as the background of a View, scaled back up e.g. 4 times
Why the scaling? For performance reasons. It's much faster to draw everything 4 times smaller, and also the blur effect becomes "stronger" due to the upscaling - there's a limit how much ScriptIntrinsicBlur can blur with one pass, and multiple passes slow things down again.
For API < 14, you could use the flag WindowManager.LayoutParams.FLAG_BLUR_BEHIND.
For higher APIS this is no longer supported.
However, you could do this with a view.
Create a Bitmap from your activity's overall layout and Blur that bitmap with whatever method you want. Add(or unhide) a View in your layout that covers everything and you have your problem solved.
I need to know how my game can handle all these screen sizes i have seen a few options including:
Re sizing the elements to fit the screen
Making assets in lots of different sizes
I'd like to know which is more efficient ?
What are my other options ?
How would i go about making it work ?
So far i am just making my screen fit to the android device i'm testing on and this could lead to failure in the future if i do not set this handler up
Thanks
well if you are using libgdx then you dont have to worry about screen sizes. just use its camera class and set its viewports accordingly . refer this link for camera
Also you dont need to make android handlers for it.
This website talks about how to handle this problem http://developer.android.com/guide/practices/screens_support.html.
It claims the best practices are:
Use wrap_content, fill_parent, or dp units when specifying dimensions in an XML layout file
Do not use hard coded pixel values in your application code
Do not use AbsoluteLayout (it's deprecated)
Supply alternative bitmap drawables for different screen densities
The problem is not with the dimensions of the screen, rather the density of the screens. Using dp to set the size for elements is the most common way.
I am working on a photobooth type app for iPhone and Android. On iPhone, I know the exact resolution of the front camera, and am able to always output 4 mini pics predictably and make a photostrip from them. But for Android, I need a way to resize 4 images I have taken to a width of 48px and height of 320px per image. This way, I can build the same size photostrip I built for the iPhone version, and easily display the photostrips in a consistent manner on a website (I don't want the size of them to vary depending on platform). On Android, how can I resize to that resolution (48x320), even if the Android camera doesn't output that aspect ratio? Basically, I'd like to resize on Android, and have it automatically zoom as necessary until 48x320 is reached and it doesn't look stretched/distorted...I'm ok with part of the image (like the outside border) being lost in favor of getting a 48x320 image. Maybe this is just a straight Java question...
Thanks so much!
I'm currently developing my first Android app and am having some issues rendering images. The image itself is great quality to begin with, but upon rendering it the quality drastically lowers. Edges become jagged and it just looks poorly done. Everyone I've showed it to thus far has almost immediately noticed it, without any prompting about it. [start on left, end on right:]
I'm trying everything I am aware of and every tip I've been able to find by looking around online, but nothing seems to fix it.
Currently, I get the image as a Bitmap and scale it:
Bitmap holeImage = BitmapFactory.decodeResource(res, R.drawable.hole_image);
Bitmap holeImageBMP = Bitmap.createScaledBitmap(holeImage, width, height, true);
Once I have the image, I create a Paint, set a few smoothing attributes to true, and then draw it on the canvas:
Paint smoothingPaint = new Paint();
smoothingPaint.setAntiAlias(true);
smoothingPaint.setFilterBitmap(true);
smoothingPaint.setDither(true);
canvas.drawBitmap(holeImageBMP, 0, 0, smoothingPaint);
Yet, as you can obviously see above, the image quality drastically decreases. I've seen plenty of images being rendered beautifully and I'm honestly just not sure what's going on so any advice would be great!
Other notes: I'm using a SurfaceView method to handle the drawing, similar in nature to the LunarLander example given in the SDK.
Thanks again!
If you aren't restricted to much less colors than the original picture has (Does Android have 256 color modes?), I'd suggest to disable dithering, if you zoom into your picture, it does have a visible effect that perhaps destroys a smooth look.
I think in your case, dithering infers with anti-aliasing by destroying the additional colors that anti-aliasing needs for a smooth look. A quick color count on your pictures (left one about 850, right one about 140) confirms this.
That is probably related to converting images from one format to another. Also, android screens vary from device to device. Try to use another device and it might look better... Almost for sure it will have a different tone.
Try to read this great article on this problem (and banding and dithering) and consider adapting the image you created for it to work better in android devices: http://www.curious-creature.org/2010/12/08/bitmap-quality-banding-and-dithering/