Professional Android 4 Application Development

private void updateGUI() { 
  runOnUiThread(new Runnable() { 
    public void run() { 
      if (!Float.isNaN(currentPressure) { 
        pressureTextView.setText(currentPressure + "hPa"); 
        pressureTextView.invalidate(); 
      } 
      if (!Float.isNaN(currentLight) { 
        String lightStr = "Sunny"; 
        if (currentLight <= SensorManager.LIGHT_CLOUDY) 
          lightStr = "Night"; 
        else if (currentLight <= SensorManager.LIGHT_OVERCAST) 
          lightStr = "Cloudy"; 
        else if (currentLight <= SensorManager.LIGHT_SUNLIGHT) 
          lightStr = "Overcast"; 
        lightTextView.setText(lightStr); 
        lightTextView.invalidate(); 
      } 
      if (!Float.isNaN(currentTemperature) { 
        temperatureTextView.setText(currentTemperature + "C"); 
        temperatureTextView.invalidate(); 
      } 
    } 
  }); 
};

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider
  xmlns:android="http://schemas.android.com/apk/res/android"
android:initialLayout="@layout/my_widget_layout"
  android:minWidth="110dp"
  android:minHeight="110dp"
  android:label="@string/widget_label"
  android:resizeMode="horizontal|vertical"
  android:previewImage="@drawable/widget_preview"
  android:updatePeriodMillis="3600000"
/>

public static String QUAKES_REFRESHED =  
  "com.paad.earthquake.QUAKES_REFRESHED"; 

 @Override 
protected void onHandleIntent(Intent intent) { 
  refreshEarthquakes(); 
  sendBroadcast(new Intent(QUAKES_REFRESHED)); 
}

private Cursor c; 

 private Cursor executeQuery() { 
  String[] projection = new String[] { 
      EarthquakeProvider.KEY_ID, 
      EarthquakeProvider.KEY_MAGNITUDE, 
      EarthquakeProvider.KEY_DETAILS 
    }; 

  Context appContext = getApplicationContext(); 
  SharedPreferences prefs =  
    PreferenceManager.getDefaultSharedPreferences(appContext); 

  int minimumMagnitude =  
    Integer.parseInt(prefs.getString(PreferencesActivity.PREF_MIN_MAG, "3")); 

  String where = EarthquakeProvider.KEY_MAGNITUDE + " > " + minimumMagnitude; 

  return context.getContentResolver().query(EarthquakeProvider.CONTENT_URI, 
      projection, where, null, null);  
} 

public void onCreate() { 
  c = executeQuery(); 
} 

@Override
protected void onHandleIntent(Intent intent) {
  refreshEarthquakes();
  sendBroadcast(new Intent(QUAKES_REFRESHED));

  Context context = getApplicationContext();
  AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
  ComponentName earthquakeWidget = 
    new ComponentName(context, EarthquakeListWidget.class);
  int[] appWidgetIds = appWidgetManager.getAppWidgetIds(earthquakeWidget);

  appWidgetManager.notifyAppWidgetViewDataChanged(appWidgetIds,
    R.id.widget_list_view);
}

android:id=?@+id/buttonStop? 
android:layout_width=?wrap_content? 
android:layout_height=?wrap_content? 
android:text=?Stop?

android:id=?@+id/buttonPause? 
android:layout_width=?wrap_content? 
android:layout_height=?wrap_content? 
android:text=?Pause?

private void listenForMessages(BluetoothSocket socket, 
                                   StringBuilder incoming) {
      listening = true;


      int bufferSize = 1024;
      byte[] buffer = new byte[bufferSize];
      try {
        InputStream instream = socket.getInputStream();
        int bytesRead = -1;


        while (listening) {
          bytesRead = instream.read(buffer);
          if (bytesRead != -1) {
            String result = "";
            while ((bytesRead == bufferSize) &&
                   (buffer[bufferSize-1] != 0)){
              result = result + new String(buffer, 0, bytesRead - 1);
              bytesRead = instream.read(buffer);
            }
            result = result + new String(buffer, 0, bytesRead - 1);
            incoming.append(result);
          }
          socket.close();
        }
      } catch (IOException e) {
        Log.e(TAG, "Message received failed.", e);
      }
      finally {
      }
    }

    }
}

    }
  }
}