CMPS 4350 - Lab 11

Android sensor identification:

Identify which sensors your application will use.
Make this clear in your prototype sketch.


Below is sensor documentation provided by Google.

Android sensors

Sensors supported:
  TYPE_ACCELEROMETER
  TYPE_AMBIENT_TEMPERATURE
  TYPE_GRAVITY
  TYPE_GYROSCOPE
  TYPE_LIGHT
  TYPE_LINEAR_ACCELERATION
  TYPE_MAGNETIC_FIELD
  TYPE_ORIENTATION
  TYPE_PRESSURE
  TYPE_PROXIMITY
  TYPE_RELATIVE_HUMIDITY
  TYPE_ROTATION_VECTOR
  TYPE_TEMPERATURE

Examples of composit sensor output:
  Game rotation vector
  Geomagnetic rotation vector Low power sensor
  Glance gesture Low power sensor 	
  Gravity
  Gyroscope uncalibrated
  Linear acceleration
  Magnetic field uncalibrated
  Orientation (deprecated)
  Pick up gesture Low power sensor
  Rotation vector
  Significant motion Low power sensor
  Step counter Low power sensor
  Step detector Low power sensor
  Tilt detector Low power sensor
  Wake up gesture Low power sensor

Source code samples:

Below is sample code to draw graphics on a canvas (the screen).

public class MainActivity extends AppCompatActivity {
   ...
   protected void onCreate(Bundle savedInstanceState) {
      ...
      myView v;
      v = new myView(this);
      setContentView(v);
      ...
   }
   class myView extends View {
      private Paint paint;
      public myView(Context context) {
         super(context);
         init();
      }
      private void init() {
         paint = new Paint();
         paint.setStyle(Paint.Style.FILL_AND_STROKE);
         invalidate(); //causes a canvas draw
      }
      protected void onDraw(Canvas canvas) {
         paint.setColor(Color.rgb(255,255,0));
         paint.setStyle(Paint.Style.FILL);
         canvas.drawRect(0, 0, x, y, paint);
         paint.setTextSize(100);
         canvas.drawText("4350 Lab-11", 0, 0, paint);
      }
   }
}

Below is sample code to read a file from a web server.

Sources:

get-text-from-web-page-to-string

how-to-use-separate-thread-to-perform-http-requests

public class Thx implements Runnable {
   @Override
   public void run() {
      try {
         URL url = new URL("https://cs.csub.edu/~you/4350/some-file.txt");
         BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
         StringBuilder total = new StringBuilder();
         String line;
         while ((line = in.readLine()) != null) {
            total.append(line + " ");
         }
         strxx = total.toString();
         in.close();
      } catch (MalformedURLException e) {
      } catch (IOException e) {
      }
      return;
   }
};

Some sample code for sensors is below.
The code implements listeners for an accelerometer and a gyroscope sensor.

public class MainActivity extends AppCompatActivity implements SensorEventListener
{
   private SensorManager mSensorManager;
   private Sensor mAccelerometer;
   private Sensor mGyroscope;
   ...
   @Override
   public void onCreate(Bundle savedInstanceState) {
      ...
      mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
      mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
      mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_GAME);
      ...
   }
   @Override
   protected void onResume() {
      super.onResume();
      mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_NORMAL);
   }
   @Override
   protected void onPause() {
      super.onPause();
      mSensorManager.unregisterListener(this);
   }
   @Override
   public void onSensorChanged(SensorEvent event) {
      if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
         Toast.makeText( getApplicationContext(), "wiggle",
            Toast.LENGTH_SHORT ).show();
      }
   }
   ...
}