Getting OutOfMemoryException in Xamarin

问题:

java.lang.OutOfMemoryError. Consider increasing the value of $(JavaMaximumHeapSize). Java ran out of memory while executing 'java.exe'

I am getting out of memory exception in my visualstudio Xamarin Project Please help me how can i resolve this issue.

回答1:

I would increase your build heap size.

Right click your Android Project > Properties > Android Options > Advanced > Java Max Heap Size.

回答2:

If you want to increase Heap size of your application (not the build process) you can set this in your AndroidManifest.xml:

<application android:largeHeap="true"></application>

回答3:

The selected answer lead me in the right direction, but for Visual Studio 2017, the screen looks like:

回答4:

For visual studio 2015 right click Project --> Properties --> Android Options --> Advanced and heap size there.

回答5:

As of Xamarin studio version 6.3 and visual studio 7.0.1 the option to increase heap size can be found here

Right click on the android project then choose options and choose, Build/Android Build, then Advanced tab and set 1G (or something) in Java heap size

回答6:

When you run out of 1G heap size, start to optimize resources.

First check if you are not duplicating images instances, keeping same image in memory several times. For that use ffimageloading library (https://github.com/luberda-molinet/FFImageLoading) get it on nuget fast and easy.

Then optimize images you are using. For large images, other than icons, try converting everything to jpeg avoiding png with transparency, that once saved me for constant ooms.

Then try using thumbnails instead of images when you might have large uploaded images on remote. On your server pre-create thumbnails for different sizes, mini, small, medium, normal , large, xlarge etc, and load only images of size you really need. That saves a lot of memory and speed.

Another one is memory leaks. You might have cells or other elements still reside im memory if they didn't unsubscribe from messages, eventhandlers and some other. Imagine you could have several copies of a list full of images still in memory when you are sure that couldn't happen. More info here:

https://forums.xamarin.com/discussion/123876/should-we-unsubscribe-all-events-for-memory-management

https://forums.xamarin.com/discussion/87206/messaging-center-unsubscribe-from-all-messages-when-broadcast-stops

回答7:

Increasing java max heap size works for me