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    <p>Use this code. You were never setting the location of the drawable after you intialized that class. You'll have to do some calculations to set the balls location properly. The way you were doing it was getting values over 10000 which was drawing the oval off screen.</p> <pre><code>import android.app.Activity; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.RectF; import android.graphics.drawable.ShapeDrawable; import android.graphics.drawable.shapes.OvalShape; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener; import android.hardware.SensorManager; import android.os.Bundle; import android.view.View; public class Accelerometer extends Activity implements SensorEventListener { /** Called when the activity is first created. */ CustomDrawableView mCustomDrawableView = null; ShapeDrawable mDrawable = new ShapeDrawable(); public static int x; public static int y; private SensorManager sensorManager = null; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Get a reference to a SensorManager sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE); mCustomDrawableView = new CustomDrawableView(this); setContentView(mCustomDrawableView); // setContentView(R.layout.main); } // This method will update the UI on new sensor events public void onSensorChanged(SensorEvent sensorEvent) { { if (sensorEvent.sensor.getType() == Sensor.TYPE_ACCELEROMETER) { // the values you were calculating originally here were over 10000! x = (int) Math.pow(sensorEvent.values[1], 2); y = (int) Math.pow(sensorEvent.values[2], 2); } if (sensorEvent.sensor.getType() == Sensor.TYPE_ORIENTATION) { } } } // I've chosen to not implement this method public void onAccuracyChanged(Sensor arg0, int arg1) { // TODO Auto-generated method stub } @Override protected void onResume() { super.onResume(); // Register this class as a listener for the accelerometer sensor sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL); // ...and the orientation sensor sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION), SensorManager.SENSOR_DELAY_NORMAL); } @Override protected void onStop() { // Unregister the listener sensorManager.unregisterListener(this); super.onStop(); } public class CustomDrawableView extends View { static final int width = 50; static final int height = 50; public CustomDrawableView(Context context) { super(context); mDrawable = new ShapeDrawable(new OvalShape()); mDrawable.getPaint().setColor(0xff74AC23); mDrawable.setBounds(x, y, x + width, y + height); } protected void onDraw(Canvas canvas) { RectF oval = new RectF(Accelerometer.x, Accelerometer.y, Accelerometer.x + width, Accelerometer.y + height); // set bounds of rectangle Paint p = new Paint(); // set some paint options p.setColor(Color.BLUE); canvas.drawOval(oval, p); invalidate(); } } } </code></pre>
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