Android App Freeze At Second Launch about librealsense

[MartyG-RealSense]

Hi @ffreality My research of the RealSense Android wrapper's Java source code indicates that when a Close void is used, the instruction nRelease (mHandle); is usually used. For example:

@Override
public void close() {
nRelease (mHandle);
}

Here is an example of using this mechanism in the Android wrapper's source code.

https://github.com/IntelRealSense/librealsense/blob/master/wrappers/android/librealsense/src/main/java/com/intel/realsense/librealsense/Frame.java#L62-L66

[ffreality]

librealsense/wrappers/android/librealsense/src/main/java/com/intel/realsense/librealsense/RsContext.java

Line 51 in ff8a9fb

public void close() {

But shouldn't this close RsContext ?

[MartyG-RealSense]

If an app is closed down then RsContext should be able to be initialized again on the next launch with RsContext.init like in the official RealSense Java example program.

https://github.com/IntelRealSense/librealsense/blob/master/wrappers/android/examples/java_example/readme.md#on-create

[ffreality]

Yes but it somehow affect whole engine's activity. I can't even start my app for second time after I use RealSense

[ffreality]

Okay something weird happened. Samsung Galaxy S23 Android 14 has this problem but on Oculus/Meta Quest Pro (Android 12) I can start app as much as I want. There is no freeze after first usages.

I think there is problem with Android 14. What do you think ?

[MartyG-RealSense]

There is precedent from 2021 for incompatibility between the RealSense Android wrapper and the chipset in some Samsung models, as described at #8442 (comment)

In the current latest 2.55.1 SDK, support for Android 12 was added. Official Android 13 and 14 support has not yet been implemented in the SDK. Please see #10965 for notes about the Android 12 support addition.

There have been a couple of past reports of unofficial Android 13 use. For one user it worked on their Android 13 device and for the other it did not work.

[ffreality]

I packaged for SDK API Level 30 and tried to run on Samsung Android 14.
I got second startup stuck problem. It's good to know that it can be Samsung or Android 14 related.

Btw. if I package project with API level 32, I got crash at when I try to run Rs_Context init function. But it can be related with Samsung, too.

When Meta release 5.4.1 version of their specialized branch, I will try to package a mixed reality project with API level 32 and look logs.

[MartyG-RealSense]

Thanks very much for the information!

[ffreality]

Okay, problem was about Samsung.
I packaged project with SDK API Level 32 and deployed to the Quest Pro. Works like a charm with multiple usage.

[MartyG-RealSense]

It's great to hear that you were successful. Thanks so much for your ongoing work on the UE5 plugin!