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我正在计算电池充电或放电率。我使用ACTION_BATTERY_CHANGED来接收事件,并等待至少1%的更改。然后我通过时间差异(毫秒)来划分电池级别的差异。我将结果乘以1000 * 60 * 60以显示“每小时单位百分比”的比率。但我不确定我是对的还是有一些错误。因为,有时显示充电或放电约为6%或15%,这似乎是正确的。但有时它显示大约15000%。Android - 计算电池充电或放电率
所以任何人都可以告诉我这段代码有什么问题。
这里是我的代码:
注册:
IntentFilter batteryLevelFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
registerReceiver(new EnReceiverOnBatteryChange(), batteryLevelFilter)
接收机:
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;
}
}
你是什么意思“有时显示充电或放电15000%”?否则,你的方法是不正确的:你计算失去X电荷所用的时间量,并根据以前的速率来估计剩下多少时间。事实上这从来都不准确。 – shkschneider
https://www.dropbox.com/s/zss2dpns74irrq5/Screenshot_2014-04-10-06-58-26.png如果你看这个图像,它显示155%,很明显,44%的电池电量不会是在17米沥干。所以,电池没有以每小时155%的速率放电。所以,我的疑问是为什么我得到如此波动的数字。 –