android - ACTION_BATTERY_CHANGED 服务 Intent

Question

我正在使用此代码来跟踪我服务中的电池信息:

    Intent i = new ContextWrapper(applicationContext).registerReceiver(null, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
     // now you can get the level and scale from this intent variable
    int level = i.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
    int scale = i.getIntExtra(BatteryManager.EXTRA_SCALE, -1);

float battPct = level/(float)scale;

1.我想知道是否会自动更换电池？或者我是否需要定期自己触发该 Intent ？2. 另外我想知道是否有一种方法可以计算从剩余电量的 1% 开始使用了多少时间。

Answer 1

Better way to get change value you should use BroadcastReceiver.

当电池更换时获取改变的值。您需要使用 BroadCastReceiver。

IntentFilter batteryLevelFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
registerReceiver(batteryLevelReceiver, batteryLevelFilter);

BroadcastReceiver batteryLevelReceiver = new BroadcastReceiver(){
    @Override
    public void onReceive(Context context, Intent intent){
        int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
        int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
        float battPct = level/(float)scale;       
    }
};