Android实现侦听电池状态显示、电量及充电动态显示的方法

本文实例讲述了android实现侦听电池状态显示、电量及充电动态显示的方法，是android应用程序开发中非常常用的重要功能。分享给大家供大家参考之用。具体方法如下：

使用android系统的电池侦听和系统的电池图片如下；

引入源代码中的两个xml文件（这里我在android2.2的jar包中找不到，所以才引入，源代码路径：c:\android-sdk-windows\platforms\android-8\data\res\drawable），之后会发现stat_sys_battery.xml报错，如下图所示：
 

1.这些图引入到我的drawable目录下，然后将stat_sys_battery.xml中的图片引入路径更改，如下：

<level-list xmlns:android="http://schemas.android.com/apk/res/android"> 
 <item android:maxlevel="4" android:drawable="@drawable/stat_sys_battery_0" /> 
 <item android:maxlevel="14" android:drawable="@drawable/stat_sys_battery_10" /> 
 <item android:maxlevel="29" android:drawable="@drawable/stat_sys_battery_20" /> 
 <item android:maxlevel="49" android:drawable="@drawable/stat_sys_battery_40" /> 
 <item android:maxlevel="69" android:drawable="@drawable/stat_sys_battery_60" /> 
 <item android:maxlevel="89" android:drawable="@drawable/stat_sys_battery_80" /> 
 <item android:maxlevel="100" android:drawable="@drawable/stat_sys_battery_100" /> 
</level-list>

2.接下来是在activity中的操作：

创建一个intentfilter

private intentfilter mintentfilter; 

在oncreate的方法中：加入：

//电池相关 
mintentfilter = new intentfilter(); 
mintentfilter.addaction(intent.action_battery_changed); 

3.接收广播

//声明消息处理过程 
private broadcastreceiver mintentreceiver = new broadcastreceiver() { 
  @override 
  public void onreceive(context context, intent intent) { 
   string action = intent.getaction(); 
   int status = intent.getintextra("status", 0); 
   int health = intent.getintextra("health", 0); 
   boolean present = intent.getbooleanextra("present", false); 
   int level = intent.getintextra("level", 0); 
   int scale = intent.getintextra("scale", 0); 
   int icon_small = intent.getintextra("icon-small", 0); 
   int plugged = intent.getintextra("plugged", 0); 
   int voltage = intent.getintextra("voltage", 0); 
   int temperature = intent.getintextra("temperature", 0); 
   string technology = intent.getstringextra("technology"); 
   string statusstring = ""; 
   switch (status) { 
   case batterymanager.battery_status_unknown: 
    statusstring = "unknown"; 
    break; 
   case batterymanager.battery_status_charging: 
    statusstring = "charging"; 
    battery_image.setimageresource(r.drawable.stat_sys_battery_charge); 
    battery_image.getdrawable().setlevel(level); 
    break; 
   case batterymanager.battery_status_discharging: 
    statusstring = "discharging"; 
    battery_image.setimageresource(r.drawable.stat_sys_battery); 
    battery_image.getdrawable().setlevel(level); 
    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"; 
    break; 
   case batterymanager.battery_health_overheat: 
    healthstring = "overheat"; 
    break; 
   case batterymanager.battery_health_dead: 
    healthstring = "dead"; 
    break; 
   case batterymanager.battery_health_over_voltage: 
    healthstring = "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; 
   } 
   log.i("cat", statusstring); 
   log.i("cat", healthstring); 
   log.i("cat", string.valueof(present)); 
   log.i("cat", string.valueof(level)); 
   log.i("cat", string.valueof(scale)); 
   log.i("cat", string.valueof(icon_small)); 
   log.i("cat", acstring); 
   log.i("cat", string.valueof(voltage)); 
   log.i("cat", string.valueof(temperature)); 
   log.i("cat", technology); 
   //要看看是不是我们要处理的消息 
   if (action.equals(intent.action_battery_changed)) {    
    //电池电量，数字 
    log.d("battery", "" + intent.getintextra("level", 0));     
    //电池最大容量 
    log.d("battery", "" + intent.getintextra("scale", 0));     
    //电池伏数 
    log.d("battery", "" + intent.getintextra("voltage", 0));     
    //电池温度 
    log.d("battery", "" + intent.getintextra("temperature", 0)); 
    //电池状态，返回是一个数字 
    // batterymanager.battery_status_charging 表示是充电状态 
    // batterymanager.battery_status_discharging 放电中 
    // batterymanager.battery_status_not_charging 未充电 
    // batterymanager.battery_status_full 电池满 
    log.d("battery", "ss" + intent.getintextra("status", batterymanager.battery_status_charging)); 
    //充电类型 batterymanager.battery_plugged_ac 表示是充电器，不是这个值，表示是 usb 
    log.d("battery", "" + intent.getintextra("plugged", 0)); 
    //电池健康情况，返回也是一个数字 
    //batterymanager.battery_health_good 良好 
    //batterymanager.battery_health_overheat 过热 
    //batterymanager.battery_health_dead 没电 
    //batterymanager.battery_health_over_voltage 过电压 
    //batterymanager.battery_health_unspecified_failure 未知错误 
    log.d("battery", "" + intent.getintextra("health", batterymanager.battery_health_unknown)); 
   } 
  } 
 }; 

这里真正处理图片变换的是以下几句话：

switch (status) { 
case batterymanager.battery_status_unknown: 
 statusstring = "unknown"; 
 break; 
case batterymanager.battery_status_charging: 
 statusstring = "charging"; 
 battery_image.setimageresource(r.drawable.stat_sys_battery_charge); 
 battery_image.getdrawable().setlevel(level); 
 break; 
case batterymanager.battery_status_discharging: 
 statusstring = "discharging"; 
 battery_image.setimageresource(r.drawable.stat_sys_battery); 
 battery_image.getdrawable().setlevel(level); 
 break; 
case batterymanager.battery_status_not_charging: 
 statusstring = "not charging"; 
 break; 
case batterymanager.battery_status_full: 
 statusstring = "full"; 
 break; 
}

4.在onresume方法中注册消息处理器

registerreceiver(mintentreceiver, mintentfilter); 

5.在onpause方法中注销

unregisterreceiver(mintentreceiver);

希望本文所述对大家的android程序设计有所帮助。