android - 在 Android 中如何使用 ObjectAnimator 沿曲线移动到点 x

Question

我有一个 ImageView “石头”，正在将它从当前位置移动到 X、Y 位置。我想让它沿着曲线移动。请让我知道我该怎么做(我已将最小 api 设置为 11)

ObjectAnimator moveX = ObjectAnimator.ofFloat(stone, "x", catPos[0] );
ObjectAnimator moveY = ObjectAnimator.ofFloat(stone, "y", catPos[1] );
AnimatorSet as = new AnimatorSet();
as.playTogether(moveX, moveY);
as.start();

Answer 1

Budius 的回答对我来说似乎非常有用。

这是我使用的动画对象:

用途:沿路径“路径”移动 View “ View ”

Android v21+:

// Animates view changing x, y along path co-ordinates
ValueAnimator pathAnimator = ObjectAnimator.ofFloat(view, "x", "y", path)

Android v11+:

// Animates a float value from 0 to 1 
ValueAnimator pathAnimator = ValueAnimator.ofFloat(0.0f, 1.0f);

// This listener onAnimationUpdate will be called during every step in the animation
// Gets called every millisecond in my observation  
pathAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {

float[] point = new float[2];

@Override
    public void onAnimationUpdate(ValueAnimator animation) {
        // Gets the animated float fraction
        float val = animation.getAnimatedFraction();

        // Gets the point at the fractional path length  
        PathMeasure pathMeasure = new PathMeasure(path, true);
        pathMeasure.getPosTan(pathMeasure.getLength() * val, point, null);

        // Sets view location to the above point
        view.setX(point[0]);
        view.setY(point[1]);
    }
});

类似于:Android, move bitmap along a path?