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。

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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); 
    } 
  }; 
}

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