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Perfect as a replacement for Smart Tags and Airtags!

No more forgetting your Bluetooth wireless devices!!!

Warns you if you move away from a paired Bluetooth device.
(Earphones, speakers, smartwatches, smartphones, PCs, mice, smartpens, etc.)

Records your location at the time of the alert so you can return to find it later.
(You can specify locations where you won't be alerted.)

*An alert will be issued if you move more than 10 meters away from a paired device.

[How to Use] (Assumes your Bluetooth device is already paired.)

1. Launch the app.

2. Tap "Distance Measurement." (Not required after purchase.)

3. Hide the app screen (put it in the background) by switching to another app, etc.
(You can leave the app screen open.)

4. If you move more than 10 meters away from a paired Bluetooth device, an alert will be issued, and the location of the initial alert will be recorded on the [Map Screen]. (A pin with the name of the registered Bluetooth device will appear on the Map screen.)

⑤ Return to retrieve the misplaced Bluetooth device.

⑥ Tap the pin with the Bluetooth device name on the Map screen to delete the pin.

Device List Screen

A list of paired devices will be displayed.
The following will be displayed:

Indicator: If a paired device is connected, the indicator on the left will light up.
Name: Displays the device name (device type) of the paired device.
Distance: Displays the distance to the paired device.
When the app launches, if the device cannot be found, or if measurement is not possible,
the status will be "Measuring."
When "Measuring," other screens cannot be used.
The color will change depending on the distance to the paired device, as follows:

Blue: Less than 5m
Orange: Less than 10m
Red: More than 10m

Distance Measurement: Measures the distance to a paired device.
(Tap this when purchasing for the first time, adding a device, or re-measuring.)
It takes 30 seconds to a few minutes for the distance measurement to stabilize.

Calibration: Tap the "Calibration" button in the upper right corner to display the "Calibration" screen.

Paired Devices: Tap each device row to display the "Map" screen.

*You can search for part of the "Device Name (Device Type)" in the search bar.

Calibration Screen

Calibrates the distance to a paired device.
Displays the following:

Name: Displays the device name (device type).
Distance: Displays the distance to the device.
Calibration Slider: Slide left or right to calibrate the distance to a paired device using the following methods.

1. Move 1m away from the paired device.

2. Slide the slider below the paired device's name left or right to adjust it to approximately 1.0.

*You can search for part of the "Device Name (Device Type)" in the search bar.

[Map] Screen

Your current location is displayed.
Tap "Settings" in the upper right corner to display the [Settings] screen.
The following is displayed.

1. The location for which you want to control whether or not an alert will be displayed when you are more than 10m away from the paired device.

2. The location where the alert was displayed on the [Device List] screen.

To specify 1., follow the steps below.

① Tap on the map.

② Enter the name of the location you tapped.

③ A pin will appear at the location you tapped.

To delete 2.

① Tap the pin.

② If the pin displays the same device name as in the [Device List] instead of the name you entered in 1.,
tap the displayed information.

③ When the "Delete" option is displayed, confirm the deletion.

④ The pin you tapped in ① will be deleted.

[Settings] Screen

Set whether or not to issue alerts for locations specified on the [Map] screen.
If no locations are specified, nothing will be displayed.

Tapping the row of a specified location on the [Map] screen will
display or hide the "Alert" message.
If a "Alert" message is displayed, an alert will be displayed.

*You can search for part of the "Device Name (Device Type)" in the search bar.

[How to Stop Alerts]
- When the alert message appears, tap OK and select Stop Alerts.

* Alerts will be displayed periodically.
(When the app is running in the background, a notification will be displayed.)

- From the [Map] screen, tap the device name pin and select Delete to delete the device name pin.

* Multiple device name pins will not be displayed.
If there are no problems with the device,
please delete the device name pin as soon as possible.

*Due to distance measurement, it takes some time to launch the app.
*The more paired devices you have, the longer it takes for the app to launch.
*Distance measurements to paired devices may vary depending on the usage environment and the performance and status of each device, including the device running the app.
*Due to communication required for distance measurement, the app may be slow to respond.
(When asked whether to wait or quit, you can simply select wait.)
*Communication required for distance measurement occurs at regular intervals.
*Due to the above, distance measurements may be unstable for 3-5 minutes after launching the app.
*Depending on the specifications of paired devices, some devices may not be able to measure distance.
(Distance may be measured if you disconnect and reconnect.)
*The app price may be adjusted depending on the number of accesses to map information.
*The app uses foreground service functions.
The following Android-specific issues may occur that cannot be controlled by the app.
(See the bottom of the link.)
During development, the app ran normally for over an hour.

https://stackoverflow.com/questions/44425584/context-startforegroundservice-did-not-then-call-service-startforeground