Android Battery Monitor

package com.hong.monitor.battery;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.BatteryManager;
import android.os.Bundle;
import android.util.Log;
import android.widget.CheckBox;
import android.widget.TextView;
import android.widget.Toast;
public class BatteryMonitorActivity extends Activity {

    private CheckBox ac,usb,charging;
 private TextView battery_level;
   

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
        Intent batteryStatus = getApplicationContext().registerReceiver(null, ifilter);      
       
        // Are we charging / charged?
        int status = batteryStatus.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
        boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING || status == BatteryManager.BATTERY_STATUS_FULL;

        // How are we charging?
        int chargePlug = batteryStatus.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
        boolean usbCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_USB;
        boolean acCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_AC;
       
        ac = (CheckBox) findViewById(R.id.ac);
        usb = (CheckBox) findViewById(R.id.usb);
        charging = (CheckBox) findViewById(R.id.charge);
       
        ac.setChecked(acCharge);
        usb.setChecked(usbCharge);
        charging.setChecked(isCharging);
       
        int level = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
        int scale = batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
        float batteryPct = level / (float)scale;
        int temp = batteryStatus.getIntExtra(BatteryManager.EXTRA_TEMPERATURE, -1);
        int voltage = batteryStatus.getIntExtra(BatteryManager.EXTRA_VOLTAGE, -1);
        char c=186;

        int health = batteryStatus.getIntExtra(BatteryManager.EXTRA_HEALTH, -1);
       
        String shealth;
        switch(health) {
/*       
         case BatteryManager.BATTERY_HEALTH_COLD: // for level 11
          shealth = "Battery Cold";
         break;
*/       
         case BatteryManager.BATTERY_HEALTH_DEAD:
          shealth = "Battery Dead/";
          break;
         case BatteryManager.BATTERY_HEALTH_GOOD:
          shealth = "Battery Good/";
          break;
         case BatteryManager.BATTERY_HEALTH_OVERHEAT:
          shealth = "Battery Overheat/";
          break;
         case BatteryManager.BATTERY_HEALTH_OVER_VOLTAGE:
          shealth = "Battery Over Voltage/";
          break;
         case BatteryManager.BATTERY_HEALTH_UNKNOWN:
          shealth = "Battery Unknown/";
          break;
         case BatteryManager.BATTERY_HEALTH_UNSPECIFIED_FAILURE:
          shealth = "Battery Unspecified failure/";
          break;
         default:
          shealth = "Battery Other/";
        }
       
        battery_level = (TextView) findViewById(R.id.bat_level);
        battery_level.setText(shealth + level + "%/" + temp/10.0 + c + "C/" + voltage + "mV");
    }
    public class PowerConnectionReceiver extends BroadcastReceiver {   
     @Override   
     public void onReceive(Context context, Intent intent) {        
      int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1);       
      boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING || status == BatteryManager.BATTERY_STATUS_FULL;           
      int chargePlug = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);    
     
      boolean usbCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_USB;       
      boolean acCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_AC;
            ac.setChecked(acCharge);
            usb.setChecked(usbCharge);
            charging.setChecked(isCharging);
          
      if(isCharging)
          Log.i("PowerConnectionReceiver", "Charging!");
      else
          Log.i("PowerConnectionReceiver", "Not Charging!");
     
      if(usbCharge)
          Log.i("PowerConnectionReceiver", "USB Charging!");
      if(acCharge)
       Log.i("PowerConnectionReceiver", "AC Charging!");
      Toast.makeText(getApplicationContext(),"ChargePlug: " + chargePlug,Toast.LENGTH_SHORT).show();
     }
    }
    public class BatteryLevelReceiver extends BroadcastReceiver {   
     @Override   
     public void onReceive(Context context, Intent battery) {  
      int level = battery.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
      int scale = battery.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
      float batteryPct = level / (float)scale;     
      Log.i("BatteryLevelReceiver", "Battery Level: " + batteryPct);
      Toast.makeText(getApplicationContext(),"Battery Level:" + batteryPct,Toast.LENGTH_SHORT).show();
     }
    }
   
}