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Expose main thread's looper for runOnUiThread compatibility #198

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Posting to the UI thread is only possible via the looper obtained from the main activity thread. android-activity creates the AndroidApp inside a worker thread and there is no way to access the main thread's looper. Even interacting with the UI will send events into the AndroidAppInner looper and execute code in the worker thread.

This PR simply records a pointer to the thread's looper before spawning the worker thread and makes it available in a similar fashion to the existing looper.

Related discussion:
#197

@markkimsal markkimsal force-pushed the expose-main-looper branch from 677aeb7 to 53b965f Compare May 7, 2025 17:24
@markkimsal markkimsal force-pushed the expose-main-looper branch from 53b965f to edf5f87 Compare May 7, 2025 17:25
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