Google 源码中电池百分比获取方法和格式转换

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Google 源码的电池百分比获取和转换

package com.android.settingslib;

public class Utils {

    /** Formats a double from 0.0..100.0 with an option to round **/
    public static String formatPercentage(double percentage, boolean round) {
        final int localPercentage = round ? Math.round((float) percentage) : (int) percentage;
        return formatPercentage(localPercentage);
    }

    /** Formats the ratio of amount/total as a percentage. */
    public static String formatPercentage(long amount, long total) {
        return formatPercentage(((double) amount) / total);
    }

    /** Formats an integer from 0..100 as a percentage. */
    public static String formatPercentage(int percentage) {
        return formatPercentage(((double) percentage) / 100.0);
    }

    /** Formats a double from 0.0..1.0 as a percentage. */
    public static String formatPercentage(double percentage) {
        return NumberFormat.getPercentInstance().format(percentage);
    }

    public static int getBatteryLevel(Intent batteryChangedIntent) {
        int level = batteryChangedIntent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);
        int scale = batteryChangedIntent.getIntExtra(BatteryManager.EXTRA_SCALE, 100);
        return (level * 100) / scale;
    }