Me gustaria tirar por lo del constructor, pero lo he intentado y no lo consigo.
El problema que tengo es como crear la instancia desde la Activity principal, para que desde ella pueda acceder a sus metodos.
Si en la activity principal lanzo la animacion con:
Código:
startActivity (new Intent (this, SurfaceViewAnimation.class));
y la clase SufaceViewAnimation.java es la siguiente
Código:
class BouncingBallView extends SurfaceView implements SurfaceHolder.Callback {
private BouncingBallAnimationThread bbThread = null;
private int xPosition = getWidth()/2;
private int yPosition = getHeight()/2;
private int xDirection = 20;
private int yDirection = 40;
private static int radius = 20;
private static int ballColor = Color.RED;
public BouncingBallView(Context ctx, AttributeSet attrs, int defStyle) {
super(ctx, attrs, defStyle);
getHolder().addCallback(this);
}
public void onDraw(Canvas canvas) {
super.onDraw(canvas);
Paint paint = new Paint();
paint.setColor(Color.BLACK);
canvas.drawRect(0,0,getWidth(),getHeight(), paint);
paint.setColor(ballColor);
canvas.drawCircle(xPosition, yPosition, radius, paint);
}
public void surfaceCreated(SurfaceHolder holder) {
if (bbThread!=null) return;
bbThread = new BouncingBallAnimationThread(getHolder());
bbThread.start();
}
public void surfaceChanged(SurfaceHolder holder,int format, int width, int height) { }
public void surfaceDestroyed(SurfaceHolder holder) {
bbThread.stop = true;
}
private class BouncingBallAnimationThread extends Thread {
public boolean stop = false;
private SurfaceHolder surfaceHolder;
public BouncingBallAnimationThread(SurfaceHolder surfaceHolder) {
this.surfaceHolder = surfaceHolder;
}
public void run() {
while (!stop) {
xPosition += xDirection;
yPosition += yDirection;
if (xPosition<0) {
xDirection = -xDirection;
xPosition = radius; }
if (xPosition>getWidth()-radius) {
xDirection = -xDirection;
xPosition = getWidth()-radius; }
if (yPosition<0) {
yDirection = -yDirection;
yPosition = radius; }
if (yPosition>getHeight()-radius) {
yDirection = -yDirection;
yPosition = getHeight()-radius-1; }
Canvas c = null;
try {
c = surfaceHolder.lockCanvas(null);
synchronized (surfaceHolder) {
onDraw(c);
}
} finally {
if (c != null) surfaceHolder.unlockCanvasAndPost(c);
}
}
}
}
public boolean onTouchEvent(MotionEvent event) {
if (event.getAction() != MotionEvent.ACTION_DOWN) return false;
if (xDirection!=0 || yDirection!=0)
xDirection = yDirection = 0;
else {
xDirection = (int) event.getX() - xPosition;
yDirection = (int) event.getY() - yPosition;
}
return true;
}
public void setxDirection(int xDirection) {
this.xDirection = xDirection;
}
public void setyDirection(int yDirection) {
this.yDirection = yDirection;
}
public void setballColor(int ballColor) {
this.ballColor = ballColor;
}
public void setradius(int radius) {
this.radius = radius;
}
}
public class SurfaceViewAnimation extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new BouncingBallView(this,null,0));
}
}
¿Como puedo crear la instancia de SufaceViewAnimation antes de hacer el startActivity(new Intent) para poder acceder a sus metodos y poder cambiar el color de ballColor, por ej.??
Citar
Iniciado por swapd0
Hay bastante sobre el tema en la web de developer de android.
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