获取Android手机的电池电流值

Question

我正在尝试收集Android G1手机的用电量统计信息.我有兴趣知道电压和电流的值,然后能够收集本PDF中报告的统计数据.

我可以通过注册意向接收器来接收广播ACTION_BATTERY_CHANGED来获得电池电压值.但问题是Android不会通过这个SDK界面暴露当前的价值.

我试过的一种方法是通过sysfs接口,我可以使用以下命令查看adb shell中的电池电流值

$cat /sys/class/power_supply/battery/batt_current
449 

但这只有在手机通过USB接口连接时才有效.如果我断开手机,我会看到batt_current的值为'0'.我不确定为什么报告的当前值为零.它应该大于零,对吧？

获取电池电流值的任何建议/指示？如果我错了,请纠正我.

Answer 1

您可以查看Current Widget的源代码.它具有硬编码路径到某些平台存储当前值的位置.

/*
 *  Copyright (c) 2010-2011 Ran Manor
 *  
 *  This file is part of CurrentWidget.
 *    
 *  CurrentWidget is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  CurrentWidget is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with CurrentWidget.  If not, see <http://www.gnu.org/licenses/>.
*/

package com.manor.currentwidget.library;

import java.io.File;

import android.os.Build;
import android.util.Log;

public class CurrentReaderFactory {

    static public Long getValue() {

        File f = null;      

        // htc desire hd / desire z / inspire?
        if (Build.MODEL.toLowerCase().contains("desire hd") ||
                Build.MODEL.toLowerCase().contains("desire z") ||
                Build.MODEL.toLowerCase().contains("inspire")) {

            f = new File("/sys/class/power_supply/battery/batt_current");
            if (f.exists()) {
                return OneLineReader.getValue(f, false);
            }
        }

        // nexus one cyangoenmod
        f = new File("/sys/devices/platform/ds2784-battery/getcurrent");
        if (f.exists()) {
            return OneLineReader.getValue(f, true);
        }

        // sony ericsson xperia x1
        f = new File("/sys/devices/platform/i2c-adapter/i2c-0/0-0036/power_supply/ds2746-battery/current_now");
        if (f.exists()) {
            return OneLineReader.getValue(f, false);
        }

        // xdandroid
        /*if (Build.MODEL.equalsIgnoreCase("MSM")) {*/
            f = new File("/sys/devices/platform/i2c-adapter/i2c-0/0-0036/power_supply/battery/current_now");
            if (f.exists()) {
                return OneLineReader.getValue(f, false);
            }
        /*}*/

        // droid eris
        f = new File("/sys/class/power_supply/battery/smem_text");      
        if (f.exists()) {
            Long value = SMemTextReader.getValue();
            if (value != null)
                return value;
        }

        // htc sensation / evo 3d
        f = new File("/sys/class/power_supply/battery/batt_attr_text");
        if (f.exists())
        {
            Long value = BattAttrTextReader.getValue();
            if (value != null)
                return value;
        }

        // some htc devices
        f = new File("/sys/class/power_supply/battery/batt_current");
        if (f.exists())
            return OneLineReader.getValue(f, false);

        // nexus one
        f = new File("/sys/class/power_supply/battery/current_now");
        if (f.exists())
            return OneLineReader.getValue(f, true);

        // samsung galaxy vibrant       
        f = new File("/sys/class/power_supply/battery/batt_chg_current");
        if (f.exists())
            return OneLineReader.getValue(f, false);

        // sony ericsson x10
        f = new File("/sys/class/power_supply/battery/charger_current");
        if (f.exists())
            return OneLineReader.getValue(f, false);

        // Nook Color
        f = new File("/sys/class/power_supply/max17042-0/current_now");
        if (f.exists())
            return OneLineReader.getValue(f, false);

        return null;
    }
}

Answer 2

从API 21开始,我们可以获得以微安为单位的瞬时电池电流,作为整数.开发人员文档

BatteryManager mBatteryManager = (BatteryManager) getSystemService(Context.BATTERY_SERVICE);
    Long avgCurrent = null, currentNow = null;
    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
        avgCurrent = mBatteryManager.getLongProperty(BatteryManager.BATTERY_PROPERTY_CURRENT_AVERAGE);
        currentNow = mBatteryManager.getLongProperty(BatteryManager.BATTERY_PROPERTY_CURRENT_NOW);
    }
    Log.d(TAG, "BATTERY_PROPERTY_CURRENT_AVERAGE = " + avgCurrent + "mAh");
    Log.d(TAG, "BATTERY_PROPERTY_CURRENT_NOW =  " + currentNow + "mAh");

使用mBatteryManager,您可以获得瞬时当前读数.

测量设备功率和读取功耗以及NEXUS设备上的可用属性.Android开源文档

Answer 3

使用此函数获取所有设备中的电压温度电流。

在OnCreate中注册广播接收器

    this.registerReceiver(this.BatteryInfo, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));

并创建广播接收器

    private BroadcastReceiver BatteryInfo = new BroadcastReceiver() {
    @Override
    public void onReceive(Context ctxt, Intent intent) {
        int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);
        int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, 100);

        boolean isPresent = intent.getBooleanExtra("present", false);

        Bundle bundle = intent.getExtras();
        String str = bundle.toString();
        Log.i("Battery Info", str);

        if (isPresent) {
            int percent = (level * 100) / scale;

            technology.setText("Technology: "+bundle.getString("technology"));
            voltage.setText("Voltage: "+bundle.getInt("voltage")+"mV");
            temp.setText("Temperature: "+bundle.getInt("temperature"));
            curent.setText("Current: "+bundle.getInt("current_avg"));
            health.setText("Health: "+getHealthString(health_));
            charging.setText("Charging: "+getStatusString(status) + "(" +getPlugTypeString(pluggedType)+")");
            battery_percentage.setText("" + percent + "%");


        } else {
            battery_percentage.setText("Battery not present!!!");
        }
    }   
};


 private String getPlugTypeString(int plugged) {
    String plugType = "Unknown";

    switch (plugged) {
    case BatteryManager.BATTERY_PLUGGED_AC:
        plugType = "AC";
        break;
    case BatteryManager.BATTERY_PLUGGED_USB:
        plugType = "USB";
        break;
    }
    return plugType;
}

private String getHealthString(int health) {
    String healthString = "Unknown";
    switch (health) {
    case BatteryManager.BATTERY_HEALTH_DEAD:
        healthString = "Dead";
        break;
    case BatteryManager.BATTERY_HEALTH_GOOD:
        healthString = "Good Condition";
        break;
    case BatteryManager.BATTERY_HEALTH_OVER_VOLTAGE:
        healthString = "Over Voltage";
        break;
    case BatteryManager.BATTERY_HEALTH_OVERHEAT:
        healthString = "Over Heat";
        break;
    case BatteryManager.BATTERY_HEALTH_UNSPECIFIED_FAILURE:
        healthString = "Failure";
        break;
    }
    return healthString;
}
private String getStatusString(int status) {
    String statusString = "Unknown";

    switch (status) {
    case BatteryManager.BATTERY_STATUS_CHARGING:
        statusString = "Charging";
        break;
    case BatteryManager.BATTERY_STATUS_DISCHARGING:
        statusString = "Discharging";
        break;
    case BatteryManager.BATTERY_STATUS_FULL:
        statusString = "Full";
        break;
    case BatteryManager.BATTERY_STATUS_NOT_CHARGING:
        statusString = "Not Charging";
        break;
    }
    return statusString;
}

Answer 4

经过多次实验和其他各个小组的帮助，我发现无法仅通过软件获取电池电流值（因为硬件不支持它）。我发现的唯一方法是用万用表测量流过电池的电流。