Total Battery Capacity in mAh of device Programmat

问题:

I have tried powerprofile of Android....I have tried this code...but it gives me 1000 answer every time in all the devices... Is there any other way in android to get battery capacity... Eg.if mobile device capacity is 2000mAh it should return me 2000

public Double getBatteryCapacity() {

        Object mPowerProfile_ = null;
        double batteryCapacity = 0;
        final String POWER_PROFILE_CLASS = "com.android.internal.os.PowerProfile";
        try {
            mPowerProfile_ = Class.forName(POWER_PROFILE_CLASS)
                    .getConstructor(Context.class).newInstance(this);

        } catch (Exception e) {

            // Class not found?
            e.printStackTrace();
        }

        try {

            // Invoke PowerProfile method "getAveragePower" with param
            // "battery.capacity"
            batteryCapacity = (Double) Class.forName(POWER_PROFILE_CLASS)
                    .getMethod("getAveragePower", java.lang.String.class)
                    .invoke(mPowerProfile_, "battery.capacity");

        } catch (Exception e) {

            // Something went wrong
            e.printStackTrace();
        }

        return batteryCapacity;
    }

回答1:

For those users interested in the implementation of the @Yehan suggestions, here is a method that return the total battery capacity: (only for API Level >= 21)

public long getBatteryCapacity(Context context) {
   if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        BatteryManager mBatteryManager = (BatteryManager) context.getSystemService(Context.BATTERY_SERVICE);
        Integer chargeCounter = mBatteryManager.getIntProperty(BatteryManager.BATTERY_PROPERTY_CHARGE_COUNTER);
        Integer capacity = mBatteryManager.getIntProperty(BatteryManager.BATTERY_PROPERTY_CAPACITY);

        if(chargeCounter == Integer.MIN_VALUE || capacity == Integer.MIN_VALUE)
            return 0;

        return (chargeCounter/capacity) *100;
    }
    return 0;
}

Unfortunately, for some reason this approach doesn't always work. In those cases, you can use Java's Reflection APIs to retreive the value returned by getBatteryCapacity method of com.android.internal.os.PowerProfile :

public double getBatteryCapacity(Context context) {
    Object mPowerProfile;
    double batteryCapacity = 0;
    final String POWER_PROFILE_CLASS = "com.android.internal.os.PowerProfile";

    try {
        mPowerProfile = Class.forName(POWER_PROFILE_CLASS)
                .getConstructor(Context.class)
                .newInstance(context);

        batteryCapacity = (double) Class
                .forName(POWER_PROFILE_CLASS)
                .getMethod("getBatteryCapacity")
                .invoke(mPowerProfile);

    } catch (Exception e) {
        e.printStackTrace();
    }

    return batteryCapacity;

}

Source: https://android.googlesource.com/platform/frameworks/base/+/a029ea1/core/java/com/android/internal/os/PowerProfile.java

回答2:

You can use following properties of android.os.BatteryManager. BATTERY_PROPERTY_CHARGE_COUNTER which gives you the remaining battery capacity in microampere-hours. BATTERY_PROPERTY_CAPACITY which gives you the remaining battery capacity as an integer percentage.

So,

BATTERY_PROPERTY_CHARGE_COUNTER / BATTERY_PROPERTY_CAPACITY * 100

would give you the Total Battery Capacity. This would not be the precise calculation but you will be able to close the actual capacity.

References: https://source.android.com/devices/tech/power/index.html#device-power http://developer.android.com/reference/android/os/BatteryManager.html