CODEWITHSUNDEEP
androidbitmap
hpique
hpique

Reputation: 120324

Display bitmap of any size in Android

I want to display a bitmap read from the SD card at actual pixel size in Android.

I can't assume anything about the bitmap, other than Android supports its image format. The bitmap might be huge.

Seems simple enough, but when you factor Android memory limitations it gets much more complicated.

Any ideas?

Edit: Attempting to load a large bitmap gives an out of memory error because Android is not able to allocate enough memory to decode it. You can load a scaled down version of the bitmap, but this is not useful to show the bitmap at actual pixel size. The question is about how to show a large bitmap on Android while staying within the app's memory constraints (most likely by loading it in chunks).

Edit 2: The bitmap might be huge, but within the realm of reasonable. I'm talking about user images, not HD Nasa pictures.

Upvotes: 4

Views: 1584

Answers (2)

Kevin Gaudin
Kevin Gaudin

Reputation: 9945

Since android 2.3 (Gingerbread, API Level 10), you can use the BitmapRegionDecoder. I don't know any solution for older android versions. (and I've been looking for it for my EmailAlbum app)

Upvotes: 1

BitBank
BitBank

Reputation: 8715

The managed code (Java) has memory limits of 16/24/32MB even if your device has a lot more free memory. I'm currently working on an application which needs to do this and the solution is to allocate the bitmap in native code (NDK) and then render views of the image into a Java-allocated bitmap which is the size of the display. In native code you can allocate all available memory of the device, but for some reason the virtual machine limits it.

Upvotes: 3

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