我可以使用_CURRENT_NOW读取瞬时电流的值，并使用_CAPACITY获得剩余电池容量的百分比。问题是我无法使用属性mAh _CHARGE_COUNTER（_ENERGY_COUNTER）访问 TextView current = (TextView) findViewById(R.id.current);
TextView chargeCounter = (TextView) findViewById(R.id.chargeCounter);
TextView batteryLevel = (TextView) findViewById(R.id.batteryLevel);
TextView energyCounter = (TextView) findViewById(R.id.energyCounter);
BatteryManager batteryManager = (BatteryManager) getSystemService(BATTERY_SERVICE);
long cu = batteryManager.getLongProperty(BatteryManager.BATTERY_PROPERTY_CURRENT_NOW);
long q = batteryManager.getLongProperty(BatteryManager.BATTERY_PROPERTY_CHARGE_COUNTER);
long level = batteryManager.getLongProperty(BatteryManager.BATTERY_PROPERTY_CAPACITY);
long energy = batteryManager.getLongProperty(BatteryManager.BATTERY_PROPERTY_ENERGY_COUNTER);
current.setText("Current : " + String.valueOf(cu) + " mA");
chargeCounter.setText("Remaining capacity : " + String.valueOf(q) + " uAh");
batteryLevel.setText("Battery status : " + String.valueOf(level) + " %");
energyCounter.setText("Battery status : " + String.valueOf(energy) + " %");
中的剩余电量。
是由于硬件原因还是在无根电话上无法实现？
我无法理解为什么下面的代码不起作用。
9223372036854775808对于不起作用的每个属性，我都有这么多的数字：DECLARE @ColNames NVARCHAR(MAX) =''
SELECT @ColNames = @ColNames + '['+ColumnName +']'+ ', 'FROM tblColumnNames ORDER BY id
SET @ColNames = LEFT(@ColNames, LEN(@ColNames)-1)
DECLARE @TheQuery NVARCHAR(MAX)
SET @TheQuery = 'SELECT PVT.* FROM
(SELECT V.Value, (V.id - V.ColumnId) RowGroupID, C.ColumnName FROM
tblValues V INNER JOIN tblColumnNames C ON V.ColumnId = C.id ) AS SRC
PIVOT ( MAX(VALUE) FOR ColumnName IN ('+ @ColNames +')) PVT'
EXEC sp_executesql @TheQuery
有关详细信息：https://source.android.com/devices/tech/power/device
谢谢！
答案 0 :(得分：2)
值为Long.MIN_VALUE，因为您的手机不支持，您可以在https://developer.android.google.cn/reference/android/os/BatteryManager.html
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