RecyclerView如果在ScrollView中使用wrap_content,那麼有可能會出現高度為0的情況,為了解決這個問題,我們要手動測量高度并且設定高度,RecyclerView測量工作都是交個LayoutManager的,是以我們要從LayoutManager下手。
以LinearLayoutManager為例子,重寫onMeasure方法:
public class AutoSizeLayoutManager extends LinearLayoutManager{
public AutoSizeLayoutManager(Context context) {
super(context);
}
public AutoSizeLayoutManager(Context context, int orientation, boolean reverseLayout) {
super(context, orientation, reverseLayout);
}
public AutoSizeLayoutManager(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
@Override
public void onMeasure(RecyclerView.Recycler recycler, RecyclerView.State state, int widthSpec, int heightSpec) {
int itemCount = getItemCount();
if (itemCount == ) {
super.onMeasure(recycler, state, widthSpec, heightSpec);
return;
}
//測量每個item,高度相加
int measuredWidth = ;
int measuredHeight = ;
for (int i = ; i < itemCount; i++) {
View view = recycler.getViewForPosition(i);
if (view != null) {
measureChild(view, widthSpec, heightSpec);
measuredWidth += view.getMeasuredWidth();
measuredHeight += view.getMeasuredHeight();
}
}
//if (!isAutoWidth){//使用原來的寬度
// measuredWidth = View.MeasureSpec.getSize(widthSpec);
//}
//if (!isAutoHeight){//使用原來的高度
// measuredHeight = View.MeasureSpec.getSize(heightSpec);
//}
setMeasuredDimension(measuredWidth, measuredHeight);
}
}
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