Best way to get most FPS android camera?

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It seems that the only way to get the most of your Android Camera is to use the Java API (The Android API for camera access, not the OpenCV-provided ones).

You should write a Java video capture class, that receives notifications every time a new frame is captured. (Similarly, you can start the camera in picture preview mode, and get new frame notification callbacks).

Then, forward the frame buffers to you native code using JNI calls.

The exact way to do it depends on the Android version, and sometimes, on the phone maker. They do not always use the Android conventions. If you want a portable camera app, you should write different implementations for each Android version, and load the appropriate one at runtime:

class CameraInterface {};
class CameraInterface2_2 : public CameraInterface {};
class CameraInterfaceIceCream : public CameraInterface {};
....

CameraInterface camera;
if(AndroidVersion == IceCream)
{
    camera = new CameraInterfaceIceCream();
}
...

Here is where you can start

Please read carefully the documentation for the camera API. You should guarantee some maximum delay for camera callbacks, and make sure the frame is not altered, and so on.

What is actually happening is your android phone assigning the amount of memory your application could use. It is the same when creating applications on a desktop computer. When you want to benefit from the processing power, you should look for commands to explicitly reserve working memory on your phone.

Haven't worked in android so no idea how this is done, but this tip should help to get you more information from the net.