Android Question How to create an app to occupy a large part of the device memory

[LucaMs]

Given that I'm waiting the O.S. kills my app which is in background, for a test, I would develop an app which can occupy a large part (or all) of the device memory .

Any idea?

A loop that adds ImageViews to an activity (in the Activity_Create) containing big images?

 

[sorex]

it can be done easier.

try something like this

For x=0 To 9999
    Dim y(65535) As Byte
Next

or put the dim in a timer

 

[LucaMs]

Given that I'm waiting the O.S. kills my app which is in background, for a test, I would develop an app which can occupy a large part (or all) of the device memory .

Any idea?

A loop that adds ImageViews to an activity (in the Activity_Create) containing big images?

I fear that this kind of app will fill only the memory dedicated to its process. I need to know if I can reserve a lot of memory to an application

 

[LucaMs]

it can be done easier.

try something like this

For x=0 To 9999
    Dim y(65535) As Byte
Next

or put the dim in a timer

I did as I wrote in the first post and in fact the app crashes ... but then I thought the above.

Thank you, @sorex

 

[sorex]

I need to know if I can reserve a lot of memory to an application

you can tweak that x counter to know how much you can reserve (1 value before it crashes)

 

[sorex]

here it crashes at 903. not sure if it is right but I guess 903*64K=~57Mb

 

[LucaMs]

I mean: there is a limit of memory for each app; then I suppose that, if an app occupy this quantity of memory, the app crashes but my other app in background is safe (and I want the system kills it ) (sorry for my english, sigh).

I'm searching for heap space

 

[sorex]

I guess it depends if you stick to java or use these C based object files. they seems to be able to deal with more memory.

It might kill your background app to free resources for the forground one.

 

[LucaMs]

I'm searching for heap space

Found this only:
https://www.b4x.com/android/forum/threads/how-to-increase-heap-space.40240/#post-240209

I fear it is not enough.

 

[LucaMs]

I guess it depends if you stick to java or use these C based object files. they seems to be able to deal with more memory.

It might kill your background app to free resources for the forground one.

Sorry but this, for me , is Turkish

Thank you

 

[lemonisdead]

Why not loading a large bitmap in several image views ?

 

[Informatix]

Create an app using libGDX and load very big textures. They will be loaded in the native memory, not in the Java VM space. This way you can consume the total memory of the device and see nice crashes.

 

[LucaMs]

Why not loading a large bitmap in several image views ?

Any idea?

A loop that adds ImageViews to an activity (in the Activity_Create) containing big images?

Thank you

 

[LucaMs]

Create an app using libGDX and load very big textures. They will be loaded in the native memory, not in the Java VM space. This way you can consume the total memory of the device and see nice crashes.

Thank you, I'll try

 

[ivan.tellez]

To have reallistic process killing, Create more than one app to run in the background and load a large bitmap in memory.

Also in the apps, add this line to the manifest:

SetApplicationAttribute(android:largeHeap, "true")

 

[Informatix]

To have reallistic process killing, Create more than one app to run in the background and load a large bitmap in memory.

Also in the apps, add this line to the manifest:

SetApplicationAttribute(android:largeHeap, "true")

The largeheap parameter won't consume all the memory (on some devices, it's far from being the case) and you're not sure that you will kill the instance of your test app this way (Android may decide to kill the other instances of your apps created to fill the memory instead). And creating many apps to fill the memory requires to launch them, one by one.
The only convenient and efficient method is in post #12. It simulates what happens with a big game.