如何在Android上动画化视图的背景颜色变化?

例如:

我有一个红色背景色的视图。视图的背景颜色变为蓝色。我怎样才能在颜色之间平滑过渡呢?

如果视图不能做到这一点,那么另一种选择是受欢迎的。


当前回答

这里有一个很好的函数可以做到这一点:

public static void animateBetweenColors(final @NonNull View viewToAnimateItsBackground, final int colorFrom,
                                        final int colorTo, final int durationInMs) {
    final ColorDrawable colorDrawable = new ColorDrawable(durationInMs > 0 ? colorFrom : colorTo);
    ViewCompat.setBackground(viewToAnimateItsBackground, colorDrawable);
    if (durationInMs > 0) {
        final ValueAnimator colorAnimation = ValueAnimator.ofObject(new ArgbEvaluator(), colorFrom, colorTo);
        colorAnimation.addUpdateListener(animator -> {
            colorDrawable.setColor((Integer) animator.getAnimatedValue());
            ViewCompat.setBackground(viewToAnimateItsBackground, colorDrawable);
        });
        colorAnimation.setDuration(durationInMs);
        colorAnimation.start();
    }
}

在Kotlin中:

@JvmStatic
fun animateBetweenColors(viewToAnimateItsBackground: View, colorFrom: Int, colorTo: Int, durationInMs: Int) {
    val colorDrawable = ColorDrawable(if (durationInMs > 0) colorFrom else colorTo)
    ViewCompat.setBackground(viewToAnimateItsBackground, colorDrawable)
    if (durationInMs > 0) {
        val colorAnimation = ValueAnimator.ofObject(ArgbEvaluator(), colorFrom, colorTo)
        colorAnimation.addUpdateListener { animator: ValueAnimator ->
            colorDrawable.color = (animator.animatedValue as Int)
            ViewCompat.setBackground(viewToAnimateItsBackground, colorDrawable)
        }
        colorAnimation.duration = durationInMs.toLong()
        colorAnimation.start()
    }
}

其他回答

如果你想要这样的彩色动画,

这段代码将帮助你:

ValueAnimator anim = ValueAnimator.ofFloat(0, 1);   
anim.setDuration(2000);

float[] hsv;
int runColor;
int hue = 0;
hsv = new float[3]; // Transition color
hsv[1] = 1;
hsv[2] = 1;
anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {

    @Override
    public void onAnimationUpdate(ValueAnimator animation) {

        hsv[0] = 360 * animation.getAnimatedFraction();

        runColor = Color.HSVToColor(hsv);
        yourView.setBackgroundColor(runColor);
    }
});

anim.setRepeatCount(Animation.INFINITE);

anim.start();

在Kotlin中使用以下函数:

private fun animateColorValue(view: View) {
    val colorAnimation =
        ValueAnimator.ofObject(ArgbEvaluator(), Color.GRAY, Color.CYAN)
    colorAnimation.duration = 500L
    colorAnimation.addUpdateListener { animator -> view.setBackgroundColor(animator.animatedValue as Int) }
    colorAnimation.start()
}

传递任何你想改变颜色的视图。

这里有一个很好的函数可以做到这一点:

public static void animateBetweenColors(final @NonNull View viewToAnimateItsBackground, final int colorFrom,
                                        final int colorTo, final int durationInMs) {
    final ColorDrawable colorDrawable = new ColorDrawable(durationInMs > 0 ? colorFrom : colorTo);
    ViewCompat.setBackground(viewToAnimateItsBackground, colorDrawable);
    if (durationInMs > 0) {
        final ValueAnimator colorAnimation = ValueAnimator.ofObject(new ArgbEvaluator(), colorFrom, colorTo);
        colorAnimation.addUpdateListener(animator -> {
            colorDrawable.setColor((Integer) animator.getAnimatedValue());
            ViewCompat.setBackground(viewToAnimateItsBackground, colorDrawable);
        });
        colorAnimation.setDuration(durationInMs);
        colorAnimation.start();
    }
}

在Kotlin中:

@JvmStatic
fun animateBetweenColors(viewToAnimateItsBackground: View, colorFrom: Int, colorTo: Int, durationInMs: Int) {
    val colorDrawable = ColorDrawable(if (durationInMs > 0) colorFrom else colorTo)
    ViewCompat.setBackground(viewToAnimateItsBackground, colorDrawable)
    if (durationInMs > 0) {
        val colorAnimation = ValueAnimator.ofObject(ArgbEvaluator(), colorFrom, colorTo)
        colorAnimation.addUpdateListener { animator: ValueAnimator ->
            colorDrawable.color = (animator.animatedValue as Int)
            ViewCompat.setBackground(viewToAnimateItsBackground, colorDrawable)
        }
        colorAnimation.duration = durationInMs.toLong()
        colorAnimation.start()
    }
}

你可以使用API 11上面的ArgbEvaluatorCompat类。

implementation 'com.google.android.material:material:1.0.0' 


ValueAnimator colorAnim = ValueAnimator.ofObject(new ArgbEvaluatorCompat(), startColor, endColor);
colorAnim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
        @Override
        public void onAnimationUpdate(ValueAnimator animation) {
            mTargetColor = (int) animation.getAnimatedValue();
        }
    });
colorAnim.start();

答案可以从很多方面给出。你也可以使用ValueAnimator的ofArgb(startColor,endColor)。

火灾> 21:

int cyanColorBg = ContextCompat.getColor(this,R.color.cyan_bg);
int purpleColorBg = ContextCompat.getColor(this,R.color.purple_bg);

ValueAnimator valueAnimator = ValueAnimator.ofArgb(cyanColorBg,purpleColorBg);
        valueAnimator.setDuration(500);
        valueAnimator.setInterpolator(new LinearInterpolator());
        valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
              @Override
              public void onAnimationUpdate(ValueAnimator valueAnimator) {
                   relativeLayout.setBackgroundColor((Integer)valueAnimator.getAnimatedValue());
              }
        });
        valueAnimator.start();