电池电量是如何一层层读取的_Android

电池电量是怎么一层层读取的
怎么抓到电池电量的剩余值，又是怎么对应显出来的呢？底层到上层的流程是？

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Java code

BroadcastReceiver batteryReceiver = new BroadcastReceiver() {                        @Override            public void onReceive(Context context, Intent intent) {                //intent里是电池的各种            }        };        IntentFilter filter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);        registerReceiver(batteryReceiver, filter);
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Java code
BroadcastReceiver batteryReceiver = new BroadcastReceiver() {
            
            @Override
            public void onReceive(Context context, Intent intent) {
                //in……