Android电池电量监听的示例代码

监听电池状态只需要接收intent.action_battery_changed的广播即可，当电池状态发生变化时会发出广播。

1.运行状态如下图：

1.充电中的状态

 

2.未充电时的状态

 

2.实现代码如下，各个状态通过名字就很容易知道意思，batterymanager类中定义了电池状态。

public class mainactivity extends activity { 
  private static final string tag = "mainactivity"; 
   
  private textview mtvvoltage; 
  private textview mtvtemperature; 
  private textview mtvlevel; 
  private textview mtvstatus; 
  private textview mtvhealth; 
  private textview mtvtechnology; 
 
  @override 
  protected void oncreate(bundle savedinstancestate) { 
    super.oncreate(savedinstancestate); 
    setcontentview(r.layout.activity_main); 
     
    mtvvoltage = (textview)findviewbyid(r.id.tv_voltage); 
    mtvtemperature = (textview)findviewbyid(r.id.tv_temperature); 
    mtvlevel = (textview)findviewbyid(r.id.tv_level); 
    mtvstatus = (textview)findviewbyid(r.id.tv_status); 
    mtvhealth = (textview)findviewbyid(r.id.tv_health); 
    mtvtechnology = (textview)findviewbyid(r.id.tv_technology); 
     
    this.registerreceiver(this.mbatteryreceiver, new intentfilter(  
        intent.action_battery_changed)); 
  } 
 
  @override 
  public boolean oncreateoptionsmenu(menu menu) { 
    // inflate the menu; this adds items to the action bar if it is present. 
    getmenuinflater().inflate(r.menu.main, menu); 
    return true; 
  } 
 
  private broadcastreceiver mbatteryreceiver = new broadcastreceiver() {  
    @override 
    public void onreceive(context arg0, intent arg1) {  
      int voltage=arg1.getintextra(batterymanager.extra_voltage, 0); 
      mtvvoltage.settext("电压：" + voltage / 1000 + "." + voltage % 1000 + "v"); 
        
      int temperature=arg1.getintextra(batterymanager.extra_temperature,0); 
      mtvtemperature.settext("温度：" + temperature / 10 + "." + temperature % 10 + "℃"); 
      if (temperature >= 300) { 
        mtvtemperature.settextcolor(color.red); 
      } else { 
        mtvtemperature.settextcolor(color.blue); 
      } 
       
      int level=arg1.getintextra(batterymanager.extra_level,0); 
      int scale=arg1.getintextra(batterymanager.extra_scale,0); 
      int levelpercent = (int)(((float)level / scale) * 100); 
      mtvlevel.settext("电量：" + levelpercent + "%"); 
      if (level <= 10) { 
        mtvlevel.settextcolor(color.red); 
      } else { 
        mtvlevel.settextcolor(color.blue); 
      } 
        
      int status = arg1.getintextra(batterymanager.extra_status, batterymanager.battery_status_unknown); 
      string strstatus = "未知状态";; 
      switch (status) { 
      case batterymanager.battery_status_charging: 
        strstatus = "充电中……"; 
        break; 
      case batterymanager.battery_status_discharging: 
        strstatus = "放电中……"; 
        break; 
      case batterymanager.battery_status_not_charging: 
        strstatus = "未充电"; 
        break; 
      case batterymanager.battery_status_full: 
        strstatus = "充电完成"; 
        break; 
      } 
      mtvstatus.settext("状态：" + strstatus); 
        
      int health = arg1.getintextra(batterymanager.extra_health, batterymanager.battery_health_unknown); 
      string strhealth = "未知 :(";; 
      switch (status) { 
      case batterymanager.battery_health_good: 
        strhealth = "好 :)"; 
        break; 
      case batterymanager.battery_health_overheat: 
        strhealth = "过热！"; 
        break; 
      case batterymanager.battery_health_dead: // 未充电时就会显示此状态，这是什么鬼？ 
        strhealth = "良好"; 
        break; 
      case batterymanager.battery_health_over_voltage: 
        strhealth = "电压过高！"; 
        break; 
      case batterymanager.battery_health_unspecified_failure: 
        strhealth = "未知 :("; 
        break; 
      case batterymanager.battery_health_cold: 
        strhealth = "过冷！"; 
        break; 
      } 
      mtvhealth.settext("健康状况：" + strhealth); 
       
      string technology = arg1.getstringextra(batterymanager.extra_technology); 
      mtvtechnology.settext("电池技术：" + technology); 
    } 
  }; 
}

3.layout布局如下，很简单只有几个textview：

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" 
        xmlns:tools="http://schemas.android.com/tools" 
        android:layout_width="match_parent" 
        android:layout_height="match_parent" 
        android:paddingbottom="@dimen/activity_vertical_margin" 
        android:paddingleft="@dimen/activity_horizontal_margin" 
        android:paddingright="@dimen/activity_horizontal_margin" 
        android:paddingtop="@dimen/activity_vertical_margin" 
        tools:context=".mainactivity" > 
 
  <textview android:id="@+id/tv_battery_status" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:textcolor="#0000ff" 
       android:textstyle="bold" 
       android:text="@string/battery_status" /> 
 
  <linearlayout android:layout_width="match_parent" 
         android:layout_height="wrap_content" 
         android:orientation="vertical" 
         android:layout_below="@id/tv_battery_status" > 
    <textview android:id="@+id/tv_voltage" 
         android:layout_width="wrap_content" 
         android:layout_height="wrap_content" /> 
    <textview android:id="@+id/tv_temperature" 
         android:layout_width="wrap_content" 
         android:layout_height="wrap_content" /> 
    <textview android:id="@+id/tv_level" 
         android:layout_width="wrap_content" 
         android:layout_height="wrap_content" /> 
    <textview android:id="@+id/tv_status"
         android:layout_width="wrap_content" 
         android:layout_height="wrap_content" /> 
    <textview android:id="@+id/tv_health"
         android:layout_width="wrap_content" 
         android:layout_height="wrap_content" /> 
    <textview android:id="@+id/tv_technology" 
         android:layout_width="wrap_content" 
         android:layout_height="wrap_content" /> 
    </linearlayout> 
</relativelayout>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。