Android App Development ฉบับสมบูรณ์

public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
ball.setSize(width, height);
}
public void surfaceCreated(SurfaceHolder holder) {
thread = new MyThread ();
thread.start();
}
private void draw() {
Canvas c = null;
try {
c = holder.lockCanvas();
if (c != null) {
doDraw(c);
}
} finally {
if (c != null) {
holder.unlockCanvasAndPost(c);
}
}
}
private void doDraw(Canvas c) {
int width = c.getWidth();
int height = c.getHeight();
c.drawRect(0, 0, width, height, backgroundPaint);
float ballX, ballY;
synchronized (ball.LOCK) {
ballX = ball.ballPixelX;
ballY = ball.ballPixelY;
}
}
c.drawCircle(ballX, ballY, BALL_RADIUS, ballPaint);
public void surfaceDestroyed(SurfaceHolder holder) {
try {
ball.setSize(0, 0);
thread .safeStop();
} finally {
thread = null;
}
}
private class MyThread extends Thread {
private volatile boolean running = true;
public void run() {
while (running) {
try {
TimeUnit.MILLISECONDS.sleep(5);
draw();
ball.updatePhysics();// update ตำแหน่งของลูกบอล
บทที ่ 13 การใช้งานเซนเซอร์ (Sensor) ใน Android 279