Question

我正在尝试计算电池充电或放电率。我使用ACTION_BATTERY_CHANGED来接收事件，我等待至少1％的更改。然后我将电池电量差异除以时间差（毫秒）。我将结果乘以1000 * 60 * 60以“％per hour unit”显示比率。但我不确定我是做得对还是有些错误。因为，有时它显示充电或放电约6％或15％，这似乎是正确的。但有时它显示大约15000％。

所以有人可以告诉我这段代码有什么问题。

这是我的代码：

注册：

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

接收器：

public class EnReceiverOnBatteryChange extends BroadcastReceiver
{
    @Override
    public void onReceive(Context context, Intent intent)
    {
        Utils.recordChargeOrDischargeRate(context);
        ActivityHome.updateBatteryInfo(context);
    }
}

计算：

public static void recordChargeOrDischargeRate(Context context)
{
    long lCurrentTime = System.currentTimeMillis();
    float fCurrentBatteryLevel = 0;

    float fRate = 0;
    if ((mfLastBatteryLevel != -1) && (mlLastTime != -1))
    {
        SharedPreferences preferences = context.getSharedPreferences(Konstant.PREFERENCES_FILE_NAME, Context.MODE_PRIVATE);
        SharedPreferences.Editor prefEditor = preferences.edit();

        IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
        Intent batteryStatus = context.registerReceiver(null, ifilter);

        int level = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
        int scale = batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, -1);

        if (level != -1 && scale != -1)
        {
            fCurrentBatteryLevel = 100 * level / (float) scale;
        }

        float fBatteryLevelDifference = Math.abs(fCurrentBatteryLevel - mfLastBatteryLevel);
        if (fBatteryLevelDifference > 0.99)
        {
            fRate = (fBatteryLevelDifference / (lCurrentTime - mlLastTime)) * 1000 * 60;

            prefEditor.putString(Konstant.KEY_PREF_CHARGING_START_RATE, String.format("%.2f", (fRate * 60)) + "%");
            prefEditor.commit();

            int status = batteryStatus.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
            boolean isCharging = (status == BatteryManager.BATTERY_STATUS_CHARGING || status == BatteryManager.BATTERY_STATUS_FULL);

            if (isCharging)
            {
                int nMinutes = Math.round((100 - fCurrentBatteryLevel) / fRate);
                int nHour = nMinutes / 60;
                nMinutes = nMinutes % 60;
                prefEditor.putString(Konstant.KEY_PREF_FULL_CHARGE_IN, nHour + "h " + nMinutes + "m");
                prefEditor.commit();
            }
            else
            {
                int nMinutes = Math.round(fCurrentBatteryLevel / fRate);
                int nHour = nMinutes / 60;
                nMinutes = nMinutes % 60;
                prefEditor.putString(Konstant.KEY_PREF_FULL_CHARGE_IN, nHour + "h " + nMinutes + "m");
                prefEditor.commit();
            }

            mlLastTime = lCurrentTime;
            mfLastBatteryLevel = fCurrentBatteryLevel;
        }
    }
    else
    {
        mlLastTime = lCurrentTime;
        mfLastBatteryLevel = fCurrentBatteryLevel;
    }
}

Answer 1

看一下android选项中的电池状态图。手机的能源使用率有时会在较小的时间尺度上发生巨大变化 - 尽管在较大的时间范围内它看起来是恒定的。我可能错了，但也许你应该更好地寻找几分钟的时差，而不是1％的电池电量差。

Android - 计算电池充电或放电率

1 个答案: