android - TransitionDrawable 不考虑填充？

Question

我尝试了已接受的解决方案 here ，但它似乎忽略了填充。当第二个 View (在本例中为按钮)显示时，它比具有填充的原始 View 小得多。有解决方法吗？谢谢

Answer 1

是的，TransitionDrawable 从忽略填充的 LayerDrawable 扩展而来。这是基本 Android 代码中的 getPadding() 方法，它会删除您指定的任何内容:

    @Override
    public boolean getPadding(Rect padding) {
        // Arbitrarily get the padding from the first image.
        // Technically we should maybe do something more intelligent,
        // like take the max padding of all the images.
        padding.left = 0;
        padding.top = 0;
        padding.right = 0;
        padding.bottom = 0;
        final ChildDrawable[] array = mLayerState.mChildren;
        final int N = mLayerState.mNum;
        for (int i=0; i<N; i++) {
            reapplyPadding(i, array[i]);
            padding.left += mPaddingL[i];
            padding.top += mPaddingT[i];
            padding.right += mPaddingR[i];
            padding.bottom += mPaddingB[i];
        }
        return true;
    }

参见 base Android code here .

为了处理它，我必须先保存填充值，然后再在我的 View 上设置错误的可绘制背景:

    int bottom = theView.getPaddingBottom();
    int top = theView.getPaddingTop();
    int right = theView.getPaddingRight();
    int left = theView.getPaddingLeft();
    theView.setBackgroundResource(R.drawable.faulty_drawable);
    theView.setPadding(left, top, right, bottom);