In android studio, with Google Maps API, is there a way to continously change the fill color of a polygon triggered by an iot device?

What i have:

public class MapsActivity extends AppCompatActivity implements ... 

{

...

...

private void stylePolygon(Polygon polygon) { 

...

switch (type) { case "p1": pattern = PATTERN_POLYGON_ALPHA; if (Sensor1 == 1) { //Sensor1 has the data from the cloud fillColor=COLOR_GREEN_ARGB; strokeColor=COLOR_GREEN_ARGB; } else { fillColor=0xFFD32F2F; //red strokeColor=0xFFD32F2F; } break; 

...

}

 polygon.setStrokePattern(pattern); polygon.setStrokeWidth(POLYGON_STROKE_WIDTH_PX); polygon.setStrokeColor(strokeColor); polygon.setFillColor(fillColor); } 

...

//a function to run other functions every second private Handler handler = new Handler(); private Runnable runnable = new Runnable() { @Override public void run() { new FetchIotData().execute(); //class that fetches and updates Sensor1 data handler.postDelayed(this, 1000); } 

}; 

handler.postDelayed(runnable, 1000); ... ... } Using while or do while loop in the switch statement crashes the app