閱讀Android上的最大電池電量（mah）？

Question

無論如何讀取Android SDK中的電池容量（以mah爲單位）？

感謝

Answer 1

對不起，先生。您可以獲得剩餘電量（EXTRA_LEVEL，值從0到EXTRA_SCALE），但不是原始mAH值。

Answer 2

是的，儘管沒有標準的API可以這樣做。 基於Current Widget源代碼，它爲不同設備讀取特定文件。從下面

代碼：https://code.google.com/p/currentwidget/source/browse/trunk/CurrentWidgetLibrary/src/com/manor/currentwidget/library/CurrentReaderFactory.java

package com.manor.currentwidget.library; 

import java.io.File; 
import java.util.Locale; 

import android.annotation.TargetApi; 
import android.os.Build; 

public class CurrentReaderFactory { 

    static final String BUILD_MODEL = Build.MODEL.toLowerCase(Locale.ENGLISH); 

    @TargetApi(4) 
    static public Long getValue() { 

      File f = null; 

      if (CurrentReaderFactory.BUILD_MODEL.contains("nexus 7")) { 
        f = new File("/sys/class/power_supply/battery/current_now"); 
        if (f.exists()) { 
          return OneLineReader.getValue(f, false); 
        }      
      } 

      if (CurrentReaderFactory.BUILD_MODEL.contains("sl930")) { 
        f = new File("/sys/class/power_supply/da9052-bat/current_avg"); 
        if (f.exists()) { 
          return OneLineReader.getValue(f, false); 
        }      
      } 

      // Galaxy S4 
      if (CurrentReaderFactory.BUILD_MODEL.contains("sgh-i337") 
          || CurrentReaderFactory.BUILD_MODEL.contains("gt-i9505") 
          || CurrentReaderFactory.BUILD_MODEL.contains("gt-i9500") 
          || CurrentReaderFactory.BUILD_MODEL.contains("sch-i545") 
          || CurrentReaderFactory.BUILD_MODEL.contains("find 5") 
          || CurrentReaderFactory.BUILD_MODEL.contains("sgh-m919") 
          || CurrentReaderFactory.BUILD_MODEL.contains("sgh-i537")) { 
        f = new File("/sys/class/power_supply/battery/current_now"); 
        if (f.exists()) { 
          return OneLineReader.getValue(f, false); 
        } 
      } 

      if (CurrentReaderFactory.BUILD_MODEL.contains("cynus")) { 
        f = new File(
            "/sys/devices/platform/mt6329-battery/FG_Battery_CurrentConsumption"); 
        if (f.exists()) { 
          return OneLineReader.getValue(f, false); 
        } 
      } 
      // Zopo Zp900, etc. 
      if (CurrentReaderFactory.BUILD_MODEL.contains("zp900") 
          || CurrentReaderFactory.BUILD_MODEL.contains("jy-g3") 
          || CurrentReaderFactory.BUILD_MODEL.contains("zp800") 
          || CurrentReaderFactory.BUILD_MODEL.contains("zp800h") 
          || CurrentReaderFactory.BUILD_MODEL.contains("zp810") 
          || CurrentReaderFactory.BUILD_MODEL.contains("w100") 
          || CurrentReaderFactory.BUILD_MODEL.contains("zte v987")) { 
        f = new File(
            "/sys/class/power_supply/battery/BatteryAverageCurrent"); 
        if (f.exists()) { 
          return OneLineReader.getValue(f, false); 
        } 
      } 

      // Samsung Galaxy Tab 2 
      if (CurrentReaderFactory.BUILD_MODEL.contains("gt-p31") 
          || CurrentReaderFactory.BUILD_MODEL.contains("gt-p51")) { 
        f = new File("/sys/class/power_supply/battery/current_avg"); 
        if (f.exists()) { 
          return OneLineReader.getValue(f, false); 
        } 
      } 

      // HTC One X 
      if (CurrentReaderFactory.BUILD_MODEL.contains("htc one x")) { 
        f = new File("/sys/class/power_supply/battery/batt_attr_text"); 
        if (f.exists()) { 
          Long value = BattAttrTextReader.getValue(f, "I_MBAT", "I_MBAT"); 
          if (value != null) 
            return value; 
        } 
      } 

      // wildfire S 
      if (CurrentReaderFactory.BUILD_MODEL.contains("wildfire s")) { 
        f = new File("/sys/class/power_supply/battery/smem_text"); 
        if (f.exists()) { 
          Long value = BattAttrTextReader.getValue(f, "eval_current", 
              "batt_current"); 
          if (value != null) 
            return value; 
        } 
      } 

      // trimuph with cm7, lg ls670, galaxy s3, galaxy note 2 
      if (CurrentReaderFactory.BUILD_MODEL.contains("triumph") 
          || CurrentReaderFactory.BUILD_MODEL.contains("ls670") 
          || CurrentReaderFactory.BUILD_MODEL.contains("gt-i9300") 
          || CurrentReaderFactory.BUILD_MODEL.contains("gt-n7100") 
          || CurrentReaderFactory.BUILD_MODEL.contains("sgh-i317")) { 
        f = new File("/sys/class/power_supply/battery/current_now"); 
        if (f.exists()) { 
          return OneLineReader.getValue(f, false); 
        } 
      } 

      // htc desire hd/desire z/inspire? 
      // htc evo view tablet 
      if (CurrentReaderFactory.BUILD_MODEL.contains("desire hd") 
          || CurrentReaderFactory.BUILD_MODEL.contains("desire z") 
          || CurrentReaderFactory.BUILD_MODEL.contains("inspire") 
          || CurrentReaderFactory.BUILD_MODEL.contains("pg41200")) { 
        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(f, 
            "batt_discharge_current", "batt_current"); 
        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); 

      // Xperia Arc 
      f = new File("/sys/class/power_supply/bq27520/current_now"); 
      if (f.exists()) 
        return OneLineReader.getValue(f, true); 

      // Motorola Atrix 
      f = new File(
          "/sys/devices/platform/cpcap_battery/power_supply/usb/current_now"); 
      if (f.exists()) 
        return OneLineReader.getValue(f, false); 

      // Acer Iconia Tab A500 
      f = new File("/sys/EcControl/BatCurrent"); 
      if (f.exists()) 
        return OneLineReader.getValue(f, false); 

      // charge current only, Samsung Note 
      f = new File("/sys/class/power_supply/battery/batt_current_now"); 
      if (f.exists()) 
        return OneLineReader.getValue(f, false); 

      // galaxy note, galaxy s2 
      f = new File("/sys/class/power_supply/battery/batt_current_adc"); 
      if (f.exists()) 
        return OneLineReader.getValue(f, false); 

      // intel 
      f = new File("/sys/class/power_supply/max170xx_battery/current_now"); 
      if (f.exists()) 
        return OneLineReader.getValue(f, true); 

      // Sony Xperia U 
      f = new File("/sys/class/power_supply/ab8500_fg/current_now"); 
      if (f.exists()) 
        return OneLineReader.getValue(f, true); 

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

      // Nexus 10, 4.4. 
      f = new File("/sys/class/power_supply/ds2784-fuelgauge/current_now"); 
      if (f.exists()) { 
        return OneLineReader.getValue(f, true); 
      } 

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

      return null; 
    } 
}