Question

我正在创建具有指定半径的半圆图像移动动画。我的代码工作正常。但是它在动画结束后移动到它的初始位置。我的代码如下：

内部活动：

    image = (ImageView) findViewById(R.id.image);
    image.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Animation anim = new MyAnimation(image, 150); // radius = 150
            anim.setDuration(3000);
            anim.setFillEnabled(true);
            anim.setFillAfter(true);
            image.startAnimation(anim);
        }
    });

动画类：

public class MyAnimation extends Animation {

private View view;
private float cx, cy;           // center x,y position of circular path
private float prevX, prevY;     // previous x,y position of image during animation
private float r;                // radius of circle
private float prevDx, prevDy;


/**
 * @param view - View that will be animated
 * @param r - radius of circular path
 */
public MyAnimation(View view, float r){
    this.view = view;
    this.r = r;
}

@Override
public boolean willChangeBounds() {
    return true;
}

@Override
public void initialize(int width, int height, int parentWidth, int parentHeight) {
    // calculate position of image center
    int cxImage = width / 2;
    int cyImage = height / 2;
    cx = view.getLeft() + cxImage;
    cy = view.getTop() + cyImage;

    // set previous position to center
    prevX = cx+r;
    prevY = cy;
}

@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
    if(interpolatedTime == 0){
        t.getMatrix().setTranslate(prevDx, prevDy);
        return;
    }

    float angleDeg = (interpolatedTime * 180f ) % 180;
    float angleRad = (float) Math.toRadians(angleDeg);

    // r = radius, cx and cy = center point, a = angle (radians)
    float x = (float) (cx + r * Math.cos(angleRad));
    float y = (float) (cy + r * Math.sin(angleRad));

    float dx = prevX - x;
    float dy = prevY - y;

    prevX = x;
    prevY = y;

    prevDx = dx;
    prevDy = dy;

    t.getMatrix().setTranslate(dx, dy);

}
}

请指导我完成此任务。

Answer 1

像这样开始动画

image.startAnimation(fadeInAnimation);

并添加侦听器以进行查看，并在onAnimationEnd上更改视图位置

fadeInAnimation.setAnimationListener(new Animation.AnimationListener() {
    @Override
    public void onAnimationStart(Animation animation) {

    }

    @Override
    public void onAnimationEnd(Animation animation) {

    }

    @Override
    public void onAnimationRepeat(Animation animation) {

    }
});

Answer 2

你可以设置监听器来解决这个问题。

anim.setAnimationListener(new AnimationListener() {
    @Override
    public void onAnimationEnd(Animation arg0) {
        image.setVisibility(View.GONE);

    }
});
image.startAnimation(mAnimation);

Answer 3

结束动画监听器image.setX(image.getX()+2*radius)。这将改变图像的位置。

Answer 4

@Rathi J

不知道Excat Answer ..但我正在尝试。

我认为你应该替换：

anim.setFillAfter(true);

用这个：

anim.setFillAfter(false);

希望这会有所帮助..（：

动画后避免移动到初始位置

4 个答案: