How do I get FFT size of more than 32768?

[vi]

By default it allows up to 16384 samples. If I edit audioSpectrumAnalyzer/src/main/res/values/arrays.xml, I can also get 32768 samples.

But if I try further values (65536, 131072), it stops working (shows empty 1D or 2D plot) if I select those values.

What else do I need to change to make it work for large windows?

[bewantbe]

There are few possible reasons, I didn't test them yet.

1. The drawing function drawBitmap in Canvas class has a hardware limit (down to the OpenGL/GPU limit), probably around 32768. So if you want to draw a super wide picture, you might try split it or down-sampling it (the log plot already implemented a down-sampling algorithm).
2. May be there is a limit in FFT routine???
3. A bug in my code.
4. memory allocation failure???