我正在创建一个自定义ViewGroup。我确实需要2个FrameLayout一个在另一个之上;停留在底部的那个必须是20dp,而另一个必须覆盖视图的其余部分。
onMeasure
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
int heightSize = MeasureSpec.getSize(heightMeasureSpec);
setMeasuredDimension(widthSize, heightSize);
final View content = getChildAt(CONTENT_INDEX);
final View bar = getChildAt(BAR_INDEX);
content.measure(
MeasureSpec.makeMeasureSpec(widthSize, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(heightSize - getPixels(BAR_HEIGHT), MeasureSpec.EXACTLY)
);
bar.measure(
MeasureSpec.makeMeasureSpec(widthSize, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(getPixels(BAR_HEIGHT), MeasureSpec.EXACTLY)
);
onLayout
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
mInLayout = true;
final View content = getChildAt(CONTENT_INDEX);
final View bar = getChildAt(BAR_INDEX);
if (content.getVisibility() != GONE) {
content.layout(0, 0, content.getMeasuredWidth(), content.getMeasuredHeight());
}
if (bar.getVisibility() != GONE) {
bar.layout(0, content.getMeasuredHeight(), bar.getMeasuredWidth(), 0);
}
mInLayout = false;
mFirstLayout = false;
}
}
我要添加到此自定义ViewGroup的视图
LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
mContentContainer = new FrameLayout(getContext());
mContentContainer.setLayoutParams(lp);
mBarContainer = new FrameLayout(getContext());
mBarContainer.setLayoutParams(lp);
// ... adding stuff to both containers ....
addView(mContentContainer, 0);
addView(mBarContainer, 1);
问题
mContentContainer
被正确渲染(从顶部= 0到底部=(totalHeight - 条形高度)并匹配宽度的父级),而条形图未渲染。
答案 0 :(得分:1)
View#layout()
方法中的最后一个参数是View
的底部。对于bar
,您传递的是0
,但它应该是自定义View
的高度,您可以从t
和b
中找到该高度值传递到onLayout()
。
bar.layout(0, content.getMeasuredHeight(), bar.getMeasuredWidth(), b - t);