Get Battery Level on App Launch

Question

In My app, I'm using "ACTION_BATTERY_CHANGED" intent to find battery level of the Android device.

** Problem:**

consider If the device is having 1-20 as battery level, I need to show low battery icon in my application.I'm not able to show immediately

I have registered the broadcast receiver for ACTION_BATTERY_CHANGED Intent on app launch itself. Since this is System wide announcement, I am not able to get immediately.

Can I trigger Broadcast for ACTION_BATTERY_CHANGED Intent using SendBroadcast() on App Launch?

Is this a correct behavior?

@VladyslavMatviienko,My question is get battery level on app lauch — kavie, May 07 '18 at 06:52
I know that, I read that in the question. But looks like you didn't check the question I've linked. Please do. — Vladyslav Matviienko, May 07 '18 at 06:53
@kavie So? use the method that gets battery percentage in your starter activity? — Ege Kuzubasioglu, May 07 '18 at 06:55

score 0 · Answer 1 · answered May 07 '18 at 06:57

Best way of get battery level is

           String currentBatteryStatus = "Battery Percentage";
            int deviceStatus = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
            int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
            int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
            int batteryLevel = (int) (((float) level / (float) scale) * 100.0f);

            if (deviceStatus == BatteryManager.BATTERY_STATUS_CHARGING) {
                currentBatteryStatus = currentBatteryStatus + " Charging : " + batteryLevel + " %";
            }

            if (deviceStatus == BatteryManager.BATTERY_STATUS_DISCHARGING) {
                currentBatteryStatus = currentBatteryStatus + " Discharging : " + batteryLevel + " %";
            }

            if (deviceStatus == BatteryManager.BATTERY_STATUS_FULL) {
                currentBatteryStatus = currentBatteryStatus + " Battery Full : " + batteryLevel + " %";
            }

            if (deviceStatus == BatteryManager.BATTERY_STATUS_UNKNOWN) {
                currentBatteryStatus = currentBatteryStatus + " Unknown : " + batteryLevel + " %";
            }

            if (deviceStatus == BatteryManager.BATTERY_STATUS_NOT_CHARGING) {
                currentBatteryStatus = currentBatteryStatus + " Not Charging : " + batteryLevel + " %";
            }

If you have any questions then ask me

and the question is exactly about how to get this info on app start, not when battery status changes. Please make sure that you read and understand the question before answerring — Vladyslav Matviienko, May 07 '18 at 07:04
Yes we can use same code for app start just , trigger this code by Application class — PriyankVadariya, May 07 '18 at 07:06
Yeah I have registered in application class's onCreate() and Unregistering in onTerminate() — kavie, May 07 '18 at 07:30
@kavie Okay then create broadcast receiver Trigger that from application on create and save data if you want, and kill broadcast after recover your data — PriyankVadariya, May 07 '18 at 07:34

Hitesh Sahu · Answer 2 · 2018-05-07T07:04:19.343

ACTION_BATTERY_CHANGED is sticky intent and as soon as you register a receiver for this broadcast you should be getting last modified value of it. It seems like its issue with your broadcast setup. You can do it like this:

    BroadcastReceiver powerReceiver = new BroadcastReceiver() {
                @Override
                public void onReceive(Context context, Intent intent) {
                    int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);
                    Logger.e("Power", "Battrery NOW " + String.valueOf(level) + "%");
                    //Your logic here

                }
            };

            @Override
            public void onResume() {
                super.onResume();
                getBaseActivity().registerReceiver(powerReceiver,
                        new IntentFilter(Intent.ACTION_BATTERY_CHANGED));    
            }

            @Override
            public void onPause() {
                super.onPause();
                getBaseActivity().unregisterReceiver(powerReceiver);
            }

please make sure you read the question before answering – Vladyslav Matviienko May 07 '18 at 06:58 — Vladyslav Matviienko, May 07 '18 at 06:58

Get Battery Level on App Launch

2 Answers2