MainActivity.java import android.app.Activity; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener; import android.hardware.SensorManager; import android.os.Bundle; import android.util.Log; import android.view.SurfaceHolder; import android.view.SurfaceView; public class MainActivity extends Activity implements SensorEventListener { float x, y, sensorX, sensorY; Bitmap ball; SensorManager sm; Sensor s; MyBringBackSurface ourSurfaceView; /** * Canvas Movement */ public class MyBringBackSurface extends SurfaceView implements Runnable { SurfaceHolder ourHolder; Thread ourThread = null; boolean isRunning = false; public MyBringBackSurface(Context context) { super(context)...