moving ball app with acceleration sensor does not look smooth and continuous

moving ball app with acceleration sensor does not look smooth and continuous

Hello I'm new to android and I would like to learn it very much. Now, I'm
trying to learn making games with android using sensors. What I'm trying
to do is to make a ball moving in the screen using acceleration sensor.
Actually, I did some part of it. The ball moves in the screen when
acceleration of x and y changes. But my problem is that it does not look
smooth. It looks like the ball is not drawn on the screen in continuous
paths. I use the SurfaceView class for this app and I made the drawing on
different thread than the main thread. Below part of code is from my
MainActivity class and it is the sensor related part:
@Override
public void onSensorChanged(SensorEvent event) {
// TODO Auto-generated method stub
if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
long actualTime = System.currentTimeMillis();
long delta_t = actualTime - lastUpdate;
lastUpdate = actualTime;
ax = event.values[0];
ay = event.values[1];
if (ax > 0) {
isleft = true;
delta_x = (float) (0.005 * ax * delta_t * delta_t);
}
if (ax < 0) {
isleft = false;
delta_x = (float) (-0.005 * ax * delta_t * delta_t);
}
if (ay > 0) {
isdown = true;
delta_y = (float) (0.005 * ay * delta_t * delta_t);
}
if (ay < 0) {
isdown = false;
delta_y = (float) (-0.005 * ay * delta_t * delta_t);
}
getBallPos();
}
}
private void getBallPos() {
delta_x /= 10000;
delta_y /= 10000;
for (int i = 1; i <= 10000; i++) {
if (isleft)
ballview.setX_loc(ballview.getX_loc() - delta_x);
if (!isleft)
ballview.setX_loc(ballview.getX_loc() + delta_x);
if (isdown)
ballview.setY_loc(ballview.getY_loc() + delta_y);
if (!isdown)
ballview.setY_loc(ballview.getY_loc() - delta_y);
}
}
Below part of code is from my BallGame class that extends SurfaceView and
I do the drawings on a different thread:
@Override
public void run() {
// TODO Auto-generated method stub
while (isItOk) {
if (!holder.getSurface().isValid()) {
continue;
}
canvas = holder.lockCanvas();
canvas.drawARGB(255, 150, 150, 10);
// canvas.drawLine(lineStartX, lineStartY, lineEndX,
lineEndY,
// paint);
checkBoundaries();
canvas.drawBitmap(ball, x_loc, y_loc, null);
holder.unlockCanvasAndPost(canvas);
}
}
private void checkBoundaries() {
if (x_loc > canvas.getWidth() - ballWidth) {
x_loc = canvas.getWidth() - ballWidth;
}
if (y_loc > canvas.getHeight() - ballHeight) {
y_loc = canvas.getHeight() - ballHeight;
}
if (x_loc < 0) {
x_loc = 0;
}
if (y_loc < 0) {
y_loc = 0;
}
}
If you help me in these codes, I will be very pleased. I'm very eager to
learn android but I difficultly find anywhere that I can learn android. So
if anybody suggest somewhere that I can learn android very much, I will be
very pleased.
Thank you