How to find out the memory footprint of my Android App?

Well, the title says it.

It would also be handy to know how man开发者_如何学运维y memory is still available. I am writing a memory hungry application that tends to crash randomly (in native Code), and my suspicion is that it gets out-of-memory.

I think you'd struggle to find a more comprehensive answer than this on the subject:
How do I discover memory usage of my application in Android?

i agree with hackbod's reply. As far as my understanding goes, your app wont crash , rather it will be killed. you may find this discussion interesting
Is there a need to check for NULL after allocating memory, when kernel uses overcommit memory.
I guess there is some call back to know lowmemory conditions(onLowMemory()), you can use it to identify low memory conditions, I havent tried it though.

Applications on Android generally don't crash due to low memory. If you are using a lot of memory, you may cause most all other applications to be killed. If you keep on using memory, you may cause the system to kill your app as well (not crashing it, just killing it), though you will probably get to the point of noticeable paging before that happens.

If you are dealing with native code, the more likely explanation is that you are corrupting memory somewhere.

You might want to catch the OutOfMemoryException and then call System.gc() to perform a manual garbage collection, then retry that piece of code that failed. You might be able to use native exceptions with JNI to detect when the C++ code fails due to lack of memory, or anticipate.

Check http://kohlerm.blogspot.com/2010/02/android-memory-usage-analysis-slides.html to find out which java objects use the most memory