Detect application heap size in Android

Question

How do you programmatically detect the application heap size available to an Android app?

I heard there\'s a function that does this in later versions of the SDK. In

Answer 1

The official API is:

This was introduced in 2.0 where larger memory devices appeared. You can assume that devices running prior versions of the OS are using the original memory class (16).

Answer 2

Here's how you do it:

Getting the max heap size that the app can use:

Runtime runtime = Runtime.getRuntime();
long maxMemory=runtime.maxMemory();

Getting how much of the heap your app currently uses:

long usedMemory=runtime.totalMemory() - runtime.freeMemory();

Getting how much of the heap your app can now use (available memory) :

long availableMemory=maxMemory-usedMemory;

And, to format each of them nicely, you can use:

String formattedMemorySize=Formatter.formatShortFileSize(context,memorySize); 

Answer 3

Runtime rt = Runtime.getRuntime();
rt.maxMemory()

value is b

ActivityManager am = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
am.getMemoryClass()

value is MB