获取 Android 手机的电池电流值
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原文地址: http://stackoverflow.com/questions/2439619/
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Getting the battery current values for the Android Phone
提问by Chintan Parikh
I am trying to collect power usage statistics for the Android G1 Phone. I am interested in knowing the values of Voltage and Current, and then able to collect statistics as reported in this PDF.
我正在尝试收集 Android G1 手机的电源使用统计信息。我有兴趣了解电压和电流的值，然后能够收集此PDF 中报告的统计数据。
I am able to get the value of Battery voltage through registering for an intent receiver to receive the Broadcast for ACTION_BATTERY_CHANGED. But the problem is that Android does not expose the value of current through this SDK interface.
我能够通过注册一个意图接收器来接收 ACTION_BATTERY_CHANGED 的广播来获得电池电压的值。但是问题是Android并没有通过这个SDK接口暴露current的值。
One way I tried is via sysfs interface, where I can view the battery current value from adb shell, using the following command
我尝试的一种方法是通过 sysfs 界面，在那里我可以使用以下命令从 adb shell 查看电池电流值
$cat /sys/class/power_supply/battery/batt_current
449
But that too works only if the phone is connected via USB interface. If I disconnect the phone, I see the value of batt_current as '0'. I am not sure why the value of current reported is zero. It should be more than zero, right?
但这也只有在手机通过 USB 接口连接时才有效。如果我断开电话，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。应该大于零吧？
Any suggestion / pointers for getting battery current value? Also please correct me if I am wrong.
获取电池电流值的任何建议/指针？如果我错了，也请纠正我。
采纳答案by Chintan Parikh
After several experiments and help from various other groups, I found out that there is no way of getting Battery Current value through software only (as its not supported in h/w). Only way I found was to measure current flowing through battery by means of multimeter.
经过多次实验和其他各种团体的帮助，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通过万用表测量流过电池的电流。
回答by Kevin Parker
You could just look at the source code for the Current Widget. It has hard coded path's to where certain platforms store the current values.
您可以查看 Current Widget 的源代码。它具有指向某些平台存储当前值的硬编码路径。
/*
* 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;
}
}
回答by LokiDroid
API 21 onwards we can get the instantaneous battery current in microamperes, as an integer. Developer docs
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");
Using mBatteryManager you can get the instantaneous current reading.
使用 mBatteryManager 您可以获得瞬时电流读数。
Measuring Device Power and reading power consumption and the available properties on NEXUS devices. Android open source docs
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
回答by Sumit
using this function get Voltage Temperature Current in all devices.
使用此函数获取所有设备中的电压温度电流。
in OnCreate to register broadcast reciever
在 OnCreate 中注册广播接收器
this.registerReceiver(this.BatteryInfo, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
and create Broadcast Receiver
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;
}
回答by Avinash
i found this code on Intel android developer site
我在英特尔安卓开发者网站上找到了这段代码
public class BatteryActivity extends Activity {
private final String TAG = "SDP_BATTERY";
private final String DEGREE_UNICODE = "\u00B0";
private StringBuffer textBuffer = new StringBuffer();
// a text view to show the status of the battery
private TextView mStatusTextView;
// a text view to display the battery status icon
private TextView mBatteryStatusIcon;
/** Called when the activity is first created. */
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.battery);
mBatteryStatusIcon = (TextView) this.findViewById(R.id.statusBattIcon);
mStatusTextView = (TextView) this.findViewById(R.id.statusEditText);
}
/**
* Once onResume is called, the activity has become visible (it is now "resumed"). Comes after onCreate
*/
protected void onResume() {
super.onResume();
IntentFilter filter = new IntentFilter();
filter.addAction(Intent.ACTION_BATTERY_CHANGED);
Log.d(TAG, "Register battery status receiver.");
registerReceiver(mBroadcastReceiver, filter);
}
/**
* Another activity takes focus, so this activity goes to "paused" state
*/
protected void onPause() {
super.onPause();
Log.d(TAG, "Unegister battery status receiver.");
unregisterReceiver(mBroadcastReceiver);
}
/**
* BroadcastReceiver is used for receiving intents (broadcasted messages) from the BatteryManager
*/
private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
private boolean isHealth = false;
public void onReceive(Context context, Intent intent) {
DecimalFormat formatter = new DecimalFormat();
String action = intent.getAction();
// store battery information received from BatteryManager
if (action.equals(Intent.ACTION_BATTERY_CHANGED)) {
Log.d(TAG, "Received battery status information.");
int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, 0);
int health = intent.getIntExtra(BatteryManager.EXTRA_HEALTH, 0);
boolean present = intent.getBooleanExtra(
BatteryManager.EXTRA_PRESENT, false);
int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);
int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, 0);
int icon_small = intent.getIntExtra(
BatteryManager.EXTRA_ICON_SMALL, 0);
int plugged = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED,
0);
int voltage = intent.getIntExtra(BatteryManager.EXTRA_VOLTAGE,
0);
int temperature = intent.getIntExtra(
BatteryManager.EXTRA_TEMPERATURE, 0);
String technology = intent
.getStringExtra(BatteryManager.EXTRA_TECHNOLOGY);
// display the battery icon that fits the current battery status (charging/discharging)
mBatteryStatusIcon.setCompoundDrawablesWithIntrinsicBounds(icon_small, 0, 0, 0);
// create TextView of the remaining information , to display to screen.
String statusString = "";
switch (status) {
case BatteryManager.BATTERY_STATUS_UNKNOWN:
statusString = "unknown";
break;
case BatteryManager.BATTERY_STATUS_CHARGING:
statusString = "charging";
break;
case BatteryManager.BATTERY_STATUS_DISCHARGING:
statusString = "discharging";
break;
case BatteryManager.BATTERY_STATUS_NOT_CHARGING:
statusString = "not charging";
break;
case BatteryManager.BATTERY_STATUS_FULL:
statusString = "full";
break;
}
String healthString = "";
switch (health) {
case BatteryManager.BATTERY_HEALTH_UNKNOWN:
healthString = "unknown";
break;
case BatteryManager.BATTERY_HEALTH_GOOD:
healthString = "good";
isHealth = true;
break;
case BatteryManager.BATTERY_HEALTH_OVERHEAT:
healthString = "overheat";
break;
case BatteryManager.BATTERY_HEALTH_DEAD:
healthString = "dead";
break;
case BatteryManager.BATTERY_HEALTH_OVER_VOLTAGE:
healthString = "over voltage";
break;
case BatteryManager.BATTERY_HEALTH_UNSPECIFIED_FAILURE:
healthString = "unspecified failure";
break;
}
String acString = "";
switch (plugged) {
case BatteryManager.BATTERY_PLUGGED_AC:
acString = "plugged AC";
break;
case BatteryManager.BATTERY_PLUGGED_USB:
acString = "plugged USB";
break;
default:
acString = "not plugged";
}
textBuffer = new StringBuffer();
textBuffer.append("status:" + statusString + "\n");
formatter.applyPattern("#");
String levelStr = formatter.format( (float)level/scale * 100 );
textBuffer.append("level:" + levelStr + "% (out of 100)\n");
textBuffer.append("health:" + healthString + "\n");
textBuffer.append("present?:" + String.valueOf(present) + "\n");
textBuffer.append("plugged?:" + acString + "\n");
// voltage is reported in millivolts
formatter.applyPattern(".##");
String voltageStr = formatter.format( (float)voltage/1000 );
textBuffer.append("voltage:" + voltageStr + "V\n");
// temperature is reported in tenths of a degree Centigrade (from BatteryService.java)
formatter.applyPattern(".#");
String temperatureStr = formatter.format( (float)temperature/10 );
textBuffer.append("temperature:" + temperatureStr
+ "C" + DEGREE_UNICODE + "\n");
textBuffer.append("technology:" + String.valueOf(technology)
+ "\n");
mStatusTextView.setText(textBuffer.toString());
if (isHealth) {
Log.d(TAG, "Battery health: " + healthString);
Log.d(TAG, "UMSE_BATTERY_SUCCESSFULLY");
} else {
Log.d(TAG, "UMSE_BATTERY_FAILED");
}
Log.d(TAG, textBuffer.toString());
//finish();
}
}
};
回答by Hamad
try this code,may be it would be help full for you:
试试这个代码，可能对你有帮助：
private BroadcastReceiver mBatInfoReceiver = new BroadcastReceiver(){
@Override
public void onReceive(Context arg0, Intent intent) {
// TODO Auto-generated method stub
//this will give you battery current status
int level = intent.getIntExtra("level", 0);
contentTxt.setText(String.valueOf(level) + "%");
int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
textView2.setText("status:"+status);
boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING ||
status == BatteryManager.BATTERY_STATUS_FULL;
textView3.setText("is Charging:"+isCharging);
int chargePlug = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
textView4.setText("is Charge plug:"+chargePlug);
boolean usbCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_USB;
boolean acCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_AC;
textView5.setText("USB Charging:"+usbCharge+" AC charging:"+acCharge);
}
};
in main class register this using:
在主类中使用以下方法注册：
this.registerReceiver(this.mBatInfoReceiver,
new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
回答by AnilKumar Bedide
For Battery Current % charge, you could use the following
对于电池电流％电量，您可以使用以下内容
IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
Intent batteryStatus = this.registerReceiver(null, ifilter);
int level = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
int scale = batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
float batteryPct = level / (float)scale;
TextView tView = (TextView) findViewById(R.id.textView2);
tView.setText("Battery Status " + batteryPct);
回答by 3c71
Most batteries use the current flowing out of the battery to determine the %, though it's rarely available to developpers!
大多数电池使用流出电池的电流来确定百分比，尽管开发人员很少使用它！
Would require a modified kernel on those devices.
需要在这些设备上修改内核。
This is true of the Galaxy S2 which have the chips measuring such current flow! But it's "deactivated" in the stock kernel. Meaning it's removed from the sysfs interface and used only internally by the battery.
Galaxy S2 就是如此，它的芯片可以测量这种电流！但它在股票内核中被“停用”。这意味着它已从 sysfs 接口中删除，仅在电池内部使用。
Nevertheless you can try the app Battery Monitor Widget from Market, it supports many phones and will estimate the mA current when not available. Support for new phones and methods are added on regular basis to improve the readings.
不过，您可以尝试 Market 中的 Battery Monitor Widget 应用程序，它支持许多手机，并且会在不可用时估计 mA 电流。定期添加对新手机和方法的支持以改进读数。
On the Galaxy Nexus, the current chip was completely removed as the battery now uses advanced calculation to determine %, which do not need current data. The results is that that phone doesn't have a learning curve (
在 Galaxy Nexus 上，当前芯片被完全移除，因为电池现在使用高级计算来确定 %，不需要当前数据。结果是那部手机没有学习曲线（
