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    1. POAndroid: Which thread calls .onSensorChanged?
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    1. COThe one I've been playing with is >>public boolean registerListener (SensorEventListener listener, Sensor sensor, int rate)<<. Its docs say nothing about a Handler. Are you saying that the callback method is put into the queue as a Runnable object? Otherwise I don't see how the UI thread would understand how to call the callback function if a Message appeared on its Handler.
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    2. CO@AndroidNewbie: You are welcome to review the source code [for `SensorManager`](https://android.googlesource.com/platform/frameworks/base/+/refs/heads/master/core/java/android/hardware/SensorManager.java) and [the concrete implementation `SystemSensorManager`](https://android.googlesource.com/platform/frameworks/base/+/refs/heads/master/core/java/android/hardware/SystemSensorManager.java) at your leisure. Under the covers, Android currently creates one `Handler` per listener, using that `Handler` to dispatch events on the desired thread.
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    3. COThanks for the reference, I'll dig into it. When you say "on the DESIRED thread" (emphasis mine), does it compel that to be the UI thread? A Handler can be supported by non-UI threads too. This situation concerns me because it feels like there could be thread safety and synchronization problems if, despite everything being set up by a worker thread, the UI thread is then the one that invokes the callback. If that callback method is a member of some separate class, then you'll basically have two threads working within a common instance.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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