Android : Crop Bitmap Without Reading Entire Bitmap / Cannot Read Image Into Memory
Jul 21, 2010
I have a very large image and I only want to display a section the size of the display (no scaling), and the section should just be the center of the image. Because the image is very large I cannot read the entire image into memory and then crop it. This is what I have so far but it will give OutOfMemory for large images. Also I don't think inSampleSize applies because I want to crop the image, not lower the resolution.
Uri data = getIntent().getData();
Input Stream is = getContentResolver().openInputStream(data);
Bitmap bitmap = BitmapFactory.decodeStream(is, null, null);
Any help would be great?
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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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Apr 2, 2009
I am 1) taking a picture and 2) then draw another Bitmap on top of it 3) then I store it
I am doing it as follows and it works on the emulator.
On the device I get a OutOfMemoryError: bitmap size exceeds VM budget android.graphics.Bitmap.nativeCopy(Native Method) android.graphics.Bitmap.copy(Bitmap.java:199) in the line copy the Bitmap to get a mutable Bitmap.
CODE:...........
What I am asking:
a) Is there a better way to do what I am doing? 1) take a picture 2) draw another Bitmap on top of it 3) then I store it
b) What is the best way to create a mutable Bitmap from the picture I just took with the camera?
In my app, resolution is not an issue. If it works better for small photos that would be fine.
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Oct 8, 2009
I have two questions actually:
Is it better to draw an image on a bitmap or create a bitmap as resource and then draw it over a bitmap? Performance wise... which one is better?
If I want to draw something transparent over a bitmap, how would I go about doing it?
If I want to overlay one transparent bitmap over another, how would I do it?
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Mar 22, 2009
My goal is the draw a bitmap onto another bitmap but rotated 90 degress. whats the most efficient way to do that. My current method is as follows which is horribly bad because it creates a new bitmap every time.
CODE:.....................
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Nov 4, 2010
I know how to read a bitmap file into a byte array. How is the byte array then converted to a Java Bitmap?
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Sep 27, 2010
Is there any way to pre allocate the memory required for a bitmap. Android's memory model is making it very difficult for me to cache images I need to cache.
It would seem the problem is because the VM heap rarely shrinks itself, so I would like to just allocate memory for bitmaps ahead of time? but I can not figure out how to do this?
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Feb 26, 2009
Ok I am at the end of my rope. I am doing some image processing. I have a large image file which I open and create a smaller bitmap from. At the end of processing I call recycle on everything. I null everything. I run GC manually.
I then try edit another image and I get an out of VM memory error. Bitmap exceeds etc etc.
I am looking at the heap and the secone edit doesn't seem to cause it to increase at all.
What else can I do. Surely google cannot possibly be suggesting that we can open one large bitmap per session and thats it?
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May 13, 2009
Part of my application allows the user to color-correct images. When i open an image for editing, i'd like to know what, more or less, the available bitmap memory is for the device that the app is running on.
For the G1, the limit is use is about 6MByte (about a full-size image that can be taken by the phone (3MPixels) with 16 bit color ==> 6MByte). If i try to open anything larger, i often get an out-of- memory exception. Limiting it to 6MByte reduces these OOM exceptions by a great deal. However, i can see future devices having more memory available because (as one of the reasons) they can take larger pics (e.g. 5MPixel or something).
Right now, my app just uses a hard-coded limit of 6*1024*1024. Is there a way to make this variable, to future-proof this by examine the device my app is running on. If so, how?
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Dec 2, 2009
Any one know about how to draw a bitmap image?...
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Sep 20, 2010
Can anybody have any idea about how to get a small bitmap image from a big bitmap which is the combination of many bitmaps. Any help will be appreciative.
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Aug 18, 2010
I have an image in .png format in "drawable" folder and need to create Bitmap from it, so can use in public void drawBitmap (Bitmap<http://developer.android.com/reference/android/graphics/Bitmap.html>bitmap, float left, float top, Paint <http://developer.android.com/reference/android/graphics/Paint.html>paint)
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Aug 10, 2010
I have a list view that display about 25 images with size 60x60 pixels. I dowload this images from internet and I store in an arraylist as Bitmap. I need to save it in a arraylist because a listview will recycle views and so I need, wenn the user scroll, to display the image in the new view WITHOUT downloading again from internet
But after some time I got
java.lang.OutOfMemoryError: bitmap size exceeds VM budget
It seams that I got this exception about after loading 20 images ...
Reading in forum I have read about memory heap.
I try to check the memory heap usage with: Debug.getNativeHeapAllocatedSize and Debug.getNativeHeapSize()
When the exception occours both are about 4M.
But android has more than 4M?
When the application start the values are a little less to 4M so it seams is not a big memory usage or memory leak.
To be sure I want to call : ActivityManager.getMemoryClass() but this method is and instance method and I can't find the object to invoke!
But this method say, that al min should an application have 16M!
Any help? I have seen many topics in google ... but all speak about recycle. But if I recycle a bitmat ... then should I download again from internet?
Should I store the image on flash memory or sd card instead an arraylist in memory?
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Jan 15, 2010
My game - Tower Raiders - is continually floating fairly close to running out of bitmap memory. Unfortunately, I haven't found good information on profiling bitmap memory usage so that I can optimize / make informed decisions / add new content if it allows / etc.
I'm aware that bitmap memory is not heap memory, as it's allocated natively. But that it is accounted for somehow in the VM and influences garbage collection. Maybe it's an oversimplification of how bitmap memory works - but I'd like to find a tool etc or some way of determining I as the game is running right now, there are no more than X bytes of usable bitmap memory remaining.
So, if anyone has any advice etc that would help me in these respects I would greatly like to hear about a workflow for this.
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Jun 4, 2010
I've read a lot of previous messages on this topic but couldn't find universal agreement on the whole. I can't reproduce this in house, but a customer got an OutOfMemoryError when using an icon chooser dialog.
This dialog is much like the Grid1 example - only it's in a dialog.
The bitmap memory seems to run out after running the dialog a few times for a customer, resulting in java.lang.OutOfMemoryError: bitmap size exceeds VM budget. Should I try to call recycle on the bitmap from an ImageView when I reuse the view? Or would the ImageView do that anyway?
But even if I do that, that's only a small portion of the bitmaps because most of them are seen without scrolling. The Adapter and the GridView are both local variables and therefore shouldn't be referenced after the dialog is dismissed.
I do believe that it should be possible to use many bitmaps in an app - Google Maps does it, Picture Gallery does it. But maybe I need to learn more rules. Some say you should call bitmap.recycle, some say you shouldn't have to. Many say calling gc.collect will make it worse, etc.
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Oct 12, 2010
Hints to draw a spot(small filled circle) on a bitmap image.
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Jun 10, 2010
For bitmap image..this code is not working
CODE:...............
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Jun 1, 2010
I am using BitmapFactory.decodeFile to load Bitmaps of images into my application. However, the function returns null on large images (such as those from the camera). The filepath is definitely correct, I just can't figure out why it would return null. I tried supersampling, but it didn't seem to help.
Does anyone have any idea why it would do this or how I could more easily load images taken from the camera into a Bitmap?
Here's the code I am using...
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Jun 9, 2010
I have a Bitmap image (bm) and a an ImageView (iv) of 50 by 50 when i do iv.setImageBitmap(bm) ... only a portion of the entire image is seen ..How can i see the whole image in the 50 dip by 50 dip ImageView...
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Feb 9, 2010
I want display image on another bitmap image with text.please send me the code if you are having solution.
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Jul 24, 2010
I have a large bitmap that i would like to keep in memory when the qwerty keyboard is visible. My app is always in landscape, so this is the only configuration change that will cause a reDraw. I heard this is what onRetainNonConfigurationinstance() is for...but cant figure it out. Can someone point me in the right direction?
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May 26, 2009
When I pass a Bitmap using the Binder Remote service mechanism, does the internal implementation of writeToParcel/createFromParcel of the Bitmap class use shared memory?
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Jul 22, 2010
I'm developing an image editor for Android. When I do some operations with small pictures (600x600 - 1024x768), the program work well. But when I do some operations with big pictures, I always obtain an OutOfMemory Error. I read read many post trying to have the image in memory. Also I looked at the Android's Gallery, trying to simulate the effect of loading the image with lower quality and get the complete quality after a while. But I doesn't get to work with large images.
I thought of using the parameter inSampleSize but I raised the problem of having to perform operations on the image and save it with the original size, so it no longer serves me. The only thing I've done is use the parameter inJustDecodeBounds and display an error to the user if the image exceeds the available memory.
Is there any possibility of working with large images with no memory problems? I need urgent help.
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Mar 10, 2010
How can i convert a Bitmap to Drawable.
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Jan 24, 2009
Will anybody guide me, I want to decode image bitmap picked from Picture application(on a android phone), so How should I achieve this. First thing is how to retrieve image from Picture application, after picking it, if I assign it to temp image variable, is there any method in Bitmap.Factory to decode this image into bitmap.
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Oct 4, 2010
With imageview and network-thread,i am making live cam-view ,bitmap size is "360 240", after parsing network-data to bitmap. Code...
All thing is good ,i can see live-cam but, to fit image in screen like " Bitmap.createScaledBitmap(orgBitmap, width, height / 2 , true)" Seeing bitmap is getting slow , the bigger bitmap is , the more speed down finally, shut-downed.
how to fit image in screen without pain?
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Jun 4, 2009
I want to know an image's width before decode it, so that I can set Options.inSampleSize if the image is too large. Any advice to do that?
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Nov 26, 2013
I have a basic application that uses just squares and circles that appear when the screen is toched. I want to be able to save this created image, the design is build on a bitmap image, and displayed on the canvas so I want to be able to save that as an image to the mobile device.
code for saving this?
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Jun 22, 2010
I want to draw a shape(many circles particularly) into a Specific Bitmap. I have never used canvas / 2D graphs etc. As i see it i create a Drawable put the bitmap in it then "canvas-it" to the shapes i want etc.
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Dec 23, 2009
I've been doing a lot of searching and I know a lot of other people are experiencing the same OOM memory problems with BitmapFactory. My app only shows a total memory available of 4MB using Runtime. getRuntime ().totalMemory(). If the limit is 16MB, then why doesn't the total memory grow to make room for the bitmap? Instead it throws an error.............
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