Question

我在Android上玩过一些动画片，和往常一样，它一团糟。首先，代码：

public class ResizeWidthAnimation extends Animation {
    private float mStartWeight;
    private float mWeight;
    private float mStartWeight2;
    private float mWeight2;
    private int mCurrentWidth;
    private int mCurrentWidth2;
    private View mView;
    private int mFinalWidth2;
    private View mSecondFrame;

    public ResizeWidthAnimation(View view, View secondFrame, float weight, int finalWidth2) {
        mView = view;
        mSecondFrame = secondFrame;
        mFinalWidth2 = finalWidth2;

        mWeight = weight;
        mStartWeight = ((LinearLayout.LayoutParams)view.getLayoutParams()).weight;
        mWeight2 = weight;
        mStartWeight2 = ((LinearLayout.LayoutParams)secondFrame.getLayoutParams()).weight;

        mCurrentWidth = view.getMeasuredWidth();
        mCurrentWidth2 = secondFrame.getMeasuredWidth();
    }

    @Override
    protected void applyTransformation(float interpolatedTime, Transformation t) {
        LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) mView.getLayoutParams();
        lp.weight = (float) (mStartWeight + ((mWeight - mStartWeight) * interpolatedTime));
        mView.requestLayout();
        mCurrentWidth = mView.getMeasuredWidth();

        if (mCurrentWidth2 >= mFinalWidth2) {
            return;
        }
        LinearLayout.LayoutParams lp2 = (LinearLayout.LayoutParams) mSecondFrame.getLayoutParams();
        lp2.weight = (float) (mStartWeight2 + ((mWeight2 - mStartWeight2) * interpolatedTime));
        mSecondFrame.requestLayout();
        mCurrentWidth2 = mSecondFrame.getMeasuredWidth();

    }

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

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

这是基于TWO布局权重的动画（并排放置。一个最初加权0f，另一个是8f，第三个是2f。这应该做的是：

假设提供的地方是weightsum = 10f，布局线性地放置为首先|第二|第三
将左侧布局从8f权重设置为5f。
同时做两件事：

a）动画第二个布局（放置在右边）从0f到＆＃34;围绕＆＃34;图5f

b）向右滑动第三个布局，当到达a）的末尾时，检查是否有足够的位置绘制第三个布局的32dp宽部分，向右滑动。如果是这样，请停止动画并有效地为第三个布局留下一些位置。

我确实理解requestLayout（）调用是昂贵的，并且上面的解决方案并不完美，所以我想知道是否有人能提供更好的解决方案。最糟糕的是，我需要与api v8兼容。

在android中动画3窗格视图的推荐方法？

0 个答案: