StackOverflow2013

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POAndroid Accelerometer moving ball
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copied!<p>i have done developed a sample application with the help of tutorials posted on web. my aim is to access the accelerometer and move a ball as per the phone orientation. i was successful to certail extent. But i have two isses</p> <ol> <li>the ball is going out of bound of the screen</li> <li>the ball movement is not smooth ( looks it disappears and re appears on the screen)</li> </ol> <p>here is my code. is there any change i need to do to get the smooth and exact movement of the ball as we see in lot of games.</p> <pre><code>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 Bitmap mBitmap; private Bitmap mWood; 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[0], 2); y = (int) Math.pow(sensorEvent.values[1], 2); }*/ if (sensorEvent.sensor.getType() == Sensor.TYPE_ORIENTATION) { Display display = getWindowManager().getDefaultDisplay(); int xmax = display.getWidth(); int ymax = display.getHeight(); x = (int) Math.pow(sensorEvent.values[1], 2); y = (int) Math.pow(sensorEvent.values[2], 2); if (x > xmax) { x = xmax; } else if (x < -xmax) { x = -xmax; } if (y > ymax) { y = ymax; } else if (y < -ymax) { y = -ymax; } } } } // 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_GAME); // ...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 { public CustomDrawableView(Context context) { super(context); Bitmap ball = BitmapFactory.decodeResource(getResources(), R.drawable.ball); final int dstWidth = 50; final int dstHeight = 50; mBitmap = Bitmap.createScaledBitmap(ball, dstWidth, dstHeight, true); mWood = BitmapFactory.decodeResource(getResources(), R.drawable.wood); } protected void onDraw(Canvas canvas) { final Bitmap bitmap = mBitmap; canvas.drawBitmap(mWood, 0, 0, null); canvas.drawBitmap(bitmap, x, y, null); invalidate(); } } } </code></pre>

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