Android Sample Code: Battery Status

Here I want to share Battery Status Application that output as below:

Before I share my source code for Battery Status Application for Android. Below are the tools that you need to develop an Android Application or Widget:

1. Android Development Environment - eclipse
2. Android SDK
3. Android Virtual Device Manager

*For details on how to do the installation, you may refer to Android Developers page.

For this Battery Status Application, below is the general outline:

• The layout is using ListView as the main and TextView for the individual row.
• Upon starting the application, a thread will be created to pull the battery info in 1-second interval. The battery info is being pulled using the BroadcastReceiver.

Below are the code for layout file "list_item.xml":

 <?xml version="1.0" encoding="utf-8"?>  
 <TextView  
     xmlns:android="http://schemas.android.com/apk/res/android"  
     android:layout_width="fill_parent"  
     android:layout_height="fill_parent"  
     android:padding="10dp"  
             android:textSize="16sp"   
             android:clickable="false" />  

Below are the code for the main class:

 public class BatteryStatusActivity extends ListActivity {  
   /** Called when the activity is first created. */  
      private String[] strText = new String[] {"Battery Level", "Voltage", "Status"};  
      private int voltage = 0;  
      private boolean trun = true;  
      private Handler myHandler = new Handler();  
      private Runnable myRun = new Runnable() {  
           public void run() {  
                updateNow();  
           }  
      };  
      // using Thread to keep the process running  
      private Thread myThread = new Thread() {  
           public void run () {  
                do {  
                  batteryLevelUpdate();  
                  myHandler.post(myRun);  
                  try {  
                          Thread.sleep(1000);  
                     } catch (InterruptedException e) {  
                          // TODO Auto-generated catch block  
                          e.printStackTrace();  
                     }                   
                } while (trun);  
           }  
      };  
   @Override  
   public void onCreate(Bundle savedInstanceState) {  
     super.onCreate(savedInstanceState);  
     Toast.makeText(getApplicationContext(), "email", 2000).show();  
     startMonitor();  
   }  
   @Override  
   public void onDestroy() {  
        trun = false;  
        super.onDestroy();  
   }  

   private void startMonitor() {  
        myThread.start();  
   }  
   private void updateNow() {  
        ListView thisListView = getListView();  
        thisListView.setEnabled(false);  
        ArrayAdapter<String> myList = new ArrayAdapter<String>(this, R.layout.list_item, strText);  
        thisListView.setAdapter(myList);  
   }  
   private void batteryLevelUpdate() {  
     BroadcastReceiver batteryLevelReceiver = new BroadcastReceiver() {  
       public void onReceive(Context context, Intent intent) {  
            context.unregisterReceiver(this);  
         int rawlevel = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);  
         int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);  
         int level = -1;  
         if (rawlevel >= 0 && scale > 0) {  
           level = (rawlevel * 100) / scale;  
         }  
         voltage = intent.getIntExtra(BatteryManager.EXTRA_VOLTAGE, -1);  
         int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1);  
         int onplug = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);  
         boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING || status == BatteryManager.BATTERY_STATUS_FULL;  
         boolean onUSB = onplug == BatteryManager.BATTERY_PLUGGED_USB;  
         boolean onAC = onplug == BatteryManager.BATTERY_PLUGGED_AC;  
         String strStatus = "Charging on ";  
         if (isCharging && onUSB)  
              strStatus += "USB";  
         else if (isCharging && onAC)  
              strStatus += "AC Power";  
         else  
              strStatus = "Battery Discharging";  
         strText[0] = "Battery Level: " + Integer.toString(level) + "%";  
         strText[1] = "Voltage: " + Integer.toString(voltage) + "mV";  
         strText[2] = strStatus;  
       }  
     };  
     IntentFilter batteryLevelFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);  
     registerReceiver(batteryLevelReceiver, batteryLevelFilter);  
   }  
 }  

Take note that:
If you want the ListView is non-clickable & non-scrollable, you need to set the following:

 ListView thisListView = getListView();  
 thisListView.setEnabled(false);  

If you want the ListView is non-clickable but still scrollable, you need to set the following:

 ArrayAdapter<String> myList = new ArrayAdapter<String>(this, R.layout.list_item, strText) {  
       public boolean isEnabled(int position)  
       {  
           return false;  
       }  
     };  

That's all for now.
*How did I place the source code here? visit http://codeformatter.blogspot.com/

:: aerobrainTech ::