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设置ItemView的间隔高宽
重写ItemDecoration的getItemOffsets函数即可:
recycleview.addItemDecoration(new RecyclerView.ItemDecoration() {
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
super.getItemOffsets(outRect, view, parent, state);
outRect.set(4, 4, 4, 4);//设置itemView中内容相对边框左,上,右,下距离
}
});
ItemView适应RecyclerView
RecyclerView大小固定的情况下,根据RecyclerView的宽高设置ItemView的宽高,以达到recyclerview刚好显示N行/列数据的目的:
在原理是先计算出RecyclerView的宽高,然后在Adapter的onCreateViewHolder中设置view的高度:
比如一个垂直列表,希望recyclerview刚好显示三行,这样写:
@Override
public ClubServiceAdapter.ServiceItemViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(布局文件, parent, false);
view.getLayoutParams().height = mRecyclerViewHeight/3;
return new ServiceItemViewHolder(view);
}
RecyclerView适应ItemView
ItemView大小固定的情况下,根据ItemView的宽高调整recyclerview的宽高,以达到recyclerview刚好显示N行/列数据的目的:
原理是重写LayoutManager的onMeasure方法,计算itemview的宽高,进而计算出recyclerview的宽高。
比如,一个垂直列表,希望recyclerview刚好显示三行,这样写:
recyclerView.setLayoutManager(new LinearLayoutManager(this) {
@Override
public void onMeasure(RecyclerView.Recycler recycler, RecyclerView.State state, int widthSpec, int heightSpec) {
if (getChildCount() > 0) {
View firstChildView = recycler.getViewForPosition(0);
measureChild(firstChildView, widthSpec, heightSpec);
setMeasuredDimension(View.MeasureSpec.getSize(widthSpec), firstChildView.getMeasuredHeight()*3);
} else {
super.onMeasure(recycler, state, widthSpec, heightSpec);
}
}
});