Android 什么'；s设置子视图的标准方式'；大小和位置？

我有一个扩展relativelayout的自定义视图组，它旁边有几个组件。由于嵌套权重布局的性能很差，我决定以编程方式设置子视图的大小和位置。现在，我使用xml创建视图和子视图，然后以编程方式设置其中一些视图的位置和大小，如下所示

private void assignProperSizeToChildren(int x, int y) {
    int cardWidth = x / 3;
    int cardHeight = y / 3;
    LayoutParams layoutParams = (LayoutParams) bgView1.getLayoutParams();
    layoutParams.topMargin = (int)(y / 4 * (1 - val));
    layoutParams.height = cardHeight;
    layoutParams.width = cardWidth;
    LayoutParams layoutParams2 = (LayoutParams) bgView2.getLayoutParams();
    layoutParams2.topMargin = (int)(y / 4 * (1 - val));
    layoutParams2.height = cardHeight;
    layoutParams2.width = cardWidth;
    LayoutParams layoutParams3 = (LayoutParams) bgView3.getLayoutParams();
    layoutParams3.topMargin = (int)(y * 3 / 8 * (1 - val));
    layoutParams3.height = cardHeight;
    layoutParams3.width = cardWidth;
    bgView1.setLayoutParams(layoutParams);
    bgView2.setLayoutParams(layoutParams2);
    bgView3.setLayoutParams(layoutParams3);
    bgView1.setPivotY(y / 2);
    bgView2.setPivotY(y / 2);
    bgView3.setPivotY(y / 2);
    View view = findViewById(R.id.bg);
    RelativeLayout.LayoutParams layoutParams1 = (RelativeLayout.LayoutParams) view.getLayoutParams();
    layoutParams1.topMargin = y / 6;
    layoutParams1.bottomMargin = y / 6;
    layoutParams1.leftMargin = x / 6;
    layoutParams1.rightMargin = x / 6;
    view.setLayoutParams(layoutParams1);
    LinearLayout.LayoutParams layoutParams4 = (LinearLayout.LayoutParams) receiveProgress.getLayoutParams();
    layoutParams4.width = cardWidth;
    receiveProgress.setLayoutParams(layoutParams4);
    layoutParams4 = (LinearLayout.LayoutParams) sendProgress.getLayoutParams();
    layoutParams4.width = cardWidth;
    sendProgress.setLayoutParams(layoutParams4);
    name.setTextSize(TypedValue.COMPLEX_UNIT_PX, y / 7);
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    int x = MeasureSpec.getSize(widthMeasureSpec);
    int y = MeasureSpec.getSize(heightMeasureSpec);
    setMeasuredDimension(widthMeasureSpec,heightMeasureSpec);
    assignProperSizeToChildren(x,y);
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}

它似乎可以工作，但当我想要制作动画时，视图的行为异常

anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
        @Override
        public void onAnimationUpdate(ValueAnimator valueAnimator) {
            float val = (Float) valueAnimator.getAnimatedValue();
            LayoutParams layoutParams = (LayoutParams) bgView1.getLayoutParams();
            layoutParams.topMargin = (int) (getMeasuredHeight() / 4 * (1 - val));
            bgView1.setLayoutParams(layoutParams);
            LayoutParams layoutParams2 = (LayoutParams) bgView2.getLayoutParams();
            layoutParams2.topMargin = (int) (getMeasuredHeight()  / 4 * (1 - val));
            bgView2.setLayoutParams(layoutParams2);
            LayoutParams layoutParams3 = (LayoutParams) bgView3.getLayoutParams();
            layoutParams3.topMargin = (int) (getMeasuredHeight()  / 4 * (1.5 - val));
            bgView3.setLayoutParams(layoutParams3);
            invalidate();
        }
    });

我发现每次我更改子视图的layoutparams时，

onMeasure（）

都会被调用，并且值也会更改。此外，动画根本不起作用。因此，我想知道这是否是创建自定义视图组的标准（正确）方法。

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多谢各位

在viewgroup的

onMeasure

中，您应该调用每个孩子的

measure

，让他们自己测量自己。您可以覆盖viewgroup的

OnlyLayout

，您可以在其中调用每个孩子的

布局