Android中的脉动按钮动画 [英] Pulsating button animation in Android
问题描述
我正在使用语音识别应用程序,我想在录制时将播放/停止按钮设置为脉冲".像这样:
I'm working with a Voice recognition application and I want to make my play/stop button "pulse" when it's recording. Something like this:
我试图制作一个ScaleAnimation,使按钮变大,但是,当然,它使所有按钮变大.
I have tried to make a ScaleAnimation, doing the button grow, but of course, it makes grow all the button.
public static ObjectAnimator pulseAnimation(ImageView target){
ObjectAnimator scaleDown = ObjectAnimator.ofPropertyValuesHolder(target,
PropertyValuesHolder.ofFloat("scaleX", 1.1f),
PropertyValuesHolder.ofFloat("scaleY", 1.1f));
scaleDown.setDuration(310);
scaleDown.setRepeatCount(ObjectAnimator.INFINITE);
scaleDown.setRepeatMode(ObjectAnimator.REVERSE);
return scaleDown;
}
所以这个想法是要实现类似的目标,但是要在实际按钮后面加上一个alpha字母.我想知道是否可以使用alpha动画或其他方法来执行此操作,然后再在我的按钮后面添加第二个"Alpha按钮"以使其生长并实现此效果.
So the idea is achieve something like that but just with a alpha behind the actual button. I want to know if it's possible to do this with an alpha animation or something before add a second "Alpha Button" behind my button to make it grow and achieve this effect.
推荐答案
最后,我找到了解决方案!当我的布尔值为true时,我重写了onDraw方法并为按钮绘制了第一个圆.我绘制一个以alpha为背景的第二个圆.产生脉动效果:
Finally I found the solution! I overrided the onDraw method and draw a first circle for my button and, when my boolean is true. I draw a second circle with an alpha as a background. Making a pulsating effect:
@Override
protected void onDraw(Canvas canvas) {
int w = getMeasuredWidth();
int h = getMeasuredHeight();
mCirclePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mCirclePaint.setColor(mColor);
mBackgroundPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mBackgroundPaint.setColor(Util.adjustAlpha(mColor, 0.4f));
//Draw circle
canvas.drawCircle(w/2, h/2, MIN_RADIUS_VALUE , mCirclePaint);
if (mAnimationOn) {
if (mRadius >= MAX_RADIUS_VALUE)
mPaintGoBack = true;
else if(mRadius <= MIN_RADIUS_VALUE)
mPaintGoBack = false;
//Draw pulsating shadow
canvas.drawCircle(w / 2, h / 2, mRadius, mBackgroundPaint);
mRadius = mPaintGoBack ? (mRadius - 0.5f) : (mRadius + 0.5f);
invalidate();
}
super.onDraw(canvas);
}
public void animateButton(boolean animate){
if (!animate)
mRadius = MIN_RADIUS_VALUE;
mAnimationOn = animate;
invalidate();
}
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