Question

我有一个自定义视图组，它扩展了relativelayout，我有几个组件。由于嵌套权重布局的糟糕表现，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);
}

它似乎有效，但当我想做动画时，视图表现得很奇怪。

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();
        }
    });

我发现每次更改子视图的布局框架时，onMeasure()都会被调用并且值会发生变化。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（右）方法。非常感谢你！

设置子视图的大小和位置的标准方法是什么？

0 个答案: