iOS Battery Level Issue with `react-native-device-info` (-1 Value) until `BackgroundGeolocation.start()`

[sanduluca]

Your Environment

• Plugin version: 4.12.1
• Platform: iOS
• OS version: 17.2.1
• Device manufacturer / model: iPhone XR
• React Native version (react-native -v): 0.72.4
• Plugin config

Expected Behavior

Actual Behavior

We use react-native-device-info plugin, version 10.8.0. We need to get battery level so we use https://github.com/react-native-device-info/react-native-device-info?tab=readme-ov-file#getbatterylevel api, but it returns -1. In their documentation its says to add this [UIDevice currentDevice].batteryMonitoringEnabled = true; to AppDelegate, but i still get -1 level on a real device. But i found that as soon as i call BackgroundGeolocation.start(), the getBatteryLevel returns the real device battery level and I dont get the Battery monitoring is not enabled. You need to enable monitoring with [UIDevice currentDevice].batteryMonitoringEnabled = TRUE warning

Steps to Reproduce

1. Install react-native-device-info on an real iOS device. Also install react-native-background-geolocation.
2. Try get battery level or power state using react-native-device-info

Context

useEffect(() => {
  BackgroundGeolocation.start()
    .then(() => {
      console.log("Started geolocation");
      isBatteryCharging().then((isCharging) =>
        console.log("isBatteryCharging()", isCharging)
      );
      getPowerState().then((state) => console.log("getPowerState()", state));
      getBatteryLevel()
        .then((level) => {
          console.log("getBatteryLevel1", level);
        })
        .catch((e) => {
          console.log("error on getBatteryLevel", e);
        });
    })
    .catch((e) => console.log("Error starting", e));

  return () => {
    BackgroundGeolocation.stop();
  };
}, []);

[christocracy]

You dont need another plug-in to get the battery level. Background Geolocation provides the battery-level to each recorded location.

[sanduluca]

You dont need another plug-in to get the battery level. Background Geolocation provides the battery-level to each recorded location.

We use this library not only for battery api, but in our case we need user battery level outside of user location context.

[christocracy]

When BackgroundGeolocation.start() is executed, it runs currentDevice].batteryMonitoringEnabled = true.

When BackgroundGeolocation.stop() is executed, (or the plug-in boots in State.enabled == false) it runs currentDevice].batteryMonitoringEnabled = false.

[christocracy]

currentDevice].batteryMonitoringEnabled

This is a global property of the OS.

[sanduluca]

Will this be a good solution for you to implement so you do not reset this global property ?

class Geolocation {
  
  private bool canChangeBatteryMonitoringProperty = false

  public function start(){
    if (! batteryMonitoringEnabled){
      batteryMonitoringEnabled = true
      canChangeBatteryMonitoringProperty = true
    }
  }

  public function stop(){
    ...
    if (canChangeBatteryMonitoringProperty){
      batteryMonitoringEnabled = false
      canChangeBatteryMonitoringProperty = false
    }
    ...
  }

}

[sanduluca]

@christocracy is the above proposal a good solution for you to implement ?

[sanduluca]

@christocracy Hi, did you manage to think about this ? We still need this

[github-actions[bot]]

This issue is stale because it has been open for 30 days with no activity.

[sanduluca]

Up

[github-actions[bot]]

This issue is stale because it has been open for 30 days with no activity.

[sanduluca]

Up

[github-actions[bot]]

This issue is stale because it has been open for 30 days with no activity.

[github-actions[bot]]

This issue was closed because it has been inactive for 14 days since being marked as stale.