动画的Andr​​oid RelativeLayout的变化幅度 [英] Animate change width of android RelativeLayout

问题描述

我需要从0改变RelativeLayout的宽度为600px的编程方式，以动画的方式。我用下面的code：

I need to change the width of a RelativeLayout from 0 to 600px programmatically, in an animated way. I'm using the following code:

Animation a = new Animation() {
    @Override
    protected void applyTransformation(float interpolatedTime, Transformation t) {
        RelativeLayout.LayoutParams drawerParams = (LayoutParams) drawer.getLayoutParams();
        drawerParams.width = 600;
        drawer.setLayoutParams(drawerParams);
    }
};

a.setDuration(1000); //Animate for 1s
layout.startAnimation(a);

然而，由于某种原因，这是行不通的。任何人都可以点我朝着正确的方向？

However, for some reason this isn't working. Can anyone point me in the right direction?

推荐答案

我刚刚输入这和完美的作品在这里

I just typed this up and works perfect here

动画

public class ResizeWidthAnimation extends Animation
{
    private int mWidth;
    private int mStartWidth;
    private View mView;

    public ResizeWidthAnimation(View view, int width)
    {
        mView = view;
        mWidth = width;
        mStartWidth = view.getWidth();
    }

    @Override
    protected void applyTransformation(float interpolatedTime, Transformation t)
    {
        int newWidth = mStartWidth + (int) ((mWidth - mStartWidth) * interpolatedTime);

        mView.getLayoutParams().width = newWidth;
        mView.requestLayout();
    }

    @Override
    public void initialize(int width, int height, int parentWidth, int parentHeight)
    {
        super.initialize(width, height, parentWidth, parentHeight);
    }

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

使用

if(animate)
{
    ResizeWidthAnimation anim = new ResizeWidthAnimation(leftFrame, leftFragmentWidthPx);
    anim.setDuration(500);
    leftFrame.startAnimation(anim);
}
else
{
    this.leftFragmentWidthPx = leftFragmentWidthPx;
    LayoutParams lp = (LayoutParams) leftFrame.getLayoutParams();
    lp.width = leftFragmentWidthPx;
    leftFrame.setLayoutParams(lp);
}

这篇关于动画的Andr​​oid RelativeLayout的变化幅度的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！