Android中RecyclerView嵌套RecyclerView或嵌套ListView
效果图:
RecyclerView嵌套RecyclerView
RecyclerView嵌套ListView
原理
RecyclerView嵌套RecyclerView的条目,项目中可能会经常有这样的需求,但是我们将子条目设置为RecyclerView之后,却显示不出来。自己试了很久,终于找到了原因:必须先设置子RecylcerView的高度。你要花精力确定出子RecyclerView里面条目的高度,然后从而确定子RecyclerView的高度,设置给子RecylcerView,这样做RecyclerView就可以正确显示出子ReclyclerView。
代码
首页布局就是一个竖直排列的RecyclerView
-
-
<android.support.v7.widget.RecyclerView
-
xmlns:android="http://schemas.android.com/apk/res/android"
-
android:id="@+id/recylcerview"
-
android:layout_width="match_parent"
-
android:layout_height="match_parent"/>
- 1
- 2
- 3
- 4
- 5
- 6
接下来在MainActivity对该布局进行初始化,然后制造一些假数据
-
protected void onCreate(Bundle savedInstanceState) {
-
super.onCreate(savedInstanceState);
-
setContentView(R.layout.activity_main);
-
basicParamInit();
-
initData();
-
initRecyclerView();
-
}
-
-
-
-
private void basicParamInit() {
-
DisplayMetrics metric = new DisplayMetrics();
-
getWindowManager().getDefaultDisplay().getMetrics(metric);
-
-
screenWidth = metric.widthPixels;
-
-
}
-
private void initData() {
-
data = new DataInfor();
-
ArrayList<Integer> resourceList =new ArrayList<>();
-
-
resourceList.add(R.drawable.aaa);
-
resourceList.add(R.mipmap.ic_launcher);
-
resourceList.add(R.drawable.aaa);
-
resourceList.add(R.mipmap.ic_launcher);
-
resourceList.add(R.drawable.aaa);
-
resourceList.add(R.mipmap.ic_launcher);
-
resourceList.add(R.drawable.aaa);
-
resourceList.add(R.mipmap.ic_launcher);
-
-
data.gridData = data.horizontalData = data.verticalData = resourceList;
-
-
}
-
-
private void initRecyclerView() {
-
recylcerview = (RecyclerView) findViewById(R.id.recylcerview);
-
-
recylcerview.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL,false));
-
-
recylcerview.setBackgroundResource(R.color.c_e0e0e2);
-
-
recylcerview.setAdapter(new RecyclerViewAdapter());
-
}
接下来看看RecyclerView的Adapter:
-
private class RecyclerViewAdapter extends RecyclerView.Adapter<BaseHolder>{
-
private final int HORIZONTAL_VIEW = 1000;
-
private final int VERTICAL_VIEW = 1001;
-
private final int GRID_VIEW = 1002;
-
-
@Override
-
public BaseHolder onCreateViewHolder(ViewGroup parent, int viewType) {
-
switch (viewType){
-
case HORIZONTAL_VIEW:
-
return new HorizontalViewHolder(R.layout.item_recyclerview,parent,viewType);
-
case GRID_VIEW:
-
return new GridViewHolder(R.layout.item_recyclerview,parent,viewType);
-
case VERTICAL_VIEW:
-
return new ItemViewHolder(R.layout.item_x2_imageview,parent,viewType);
-
}
-
return null;
-
}
-
-
@Override
-
public void onBindViewHolder(BaseHolder holder, int position) {
-
if(holder instanceof HorizontalViewHolder){
-
holder.refreshData(data.horizontalData,position);
-
}else if(holder instanceof GridViewHolder){
-
holder.refreshData(data.gridData,position);
-
}else if(holder instanceof ItemViewHolder){
-
holder.refreshData(data.verticalData.get(position - 2),position - 2);
-
}
-
-
}
-
-
@Override
-
public int getItemCount() {
-
return 2 + data.verticalData.size();
-
}
-
-
@Override
-
public int getItemViewType(int position) {
-
if(position == 0) return HORIZONTAL_VIEW;
-
if(position == 1) return GRID_VIEW;
-
return VERTICAL_VIEW;
-
}
-
}
可以看出,我们一共有三种条目类型,第一种是水平滑动的子RecyclerView,第二种是GridView形的子RecyclerView,第三种就是正常的子条目,根据viewType来返回不同的ViewHolder,到这里应该都没什么问题。
接下来就是各个类型的ViewHolder了,在Holder当中,我们要计算条目的高度然后设置给子RecyclerView
-
private class HorizontalViewHolder extends BaseHolder<List<Integer>>{
-
private RecyclerView hor_recyclerview;
-
-
private List<Integer> data;
-
-
public HorizontalViewHolder(int viewId, ViewGroup parent, int viewType) {
-
super(viewId, parent, viewType);
-
hor_recyclerview = (RecyclerView) itemView.findViewById(R.id.item_recyclerview);
-
}
-
-
-
public void refreshData(List<Integer> data, int position) {
-
this.data = data;
-
ViewGroup.LayoutParams layoutParams = hor_recyclerview.getLayoutParams();
-
//高度等于=条目的高度+ 10dp的间距 + 10dp(为了让条目居中)
-
layoutParams.height = screenWidth/3 + dip2px(20);
-
hor_recyclerview.setLayoutParams(layoutParams);
-
hor_recyclerview.setLayoutManager(new LinearLayoutManager(MainActivity.this, LinearLayoutManager.HORIZONTAL,false));
-
hor_recyclerview.setBackgroundResource(R.color.colorAccent);
-
hor_recyclerview.setAdapter(new HorizontalAdapter());
-
}
-
-
private class HorizontalAdapter extends RecyclerView.Adapter<BaseHolder>{
-
-
-
public BaseHolder onCreateViewHolder(ViewGroup parent, int viewType) {
-
return new ItemViewHolder(R.layout.item_x2_imageview,parent,viewType);
-
}
-
-
-
public void onBindViewHolder(BaseHolder holder, int position) {
-
holder.refreshData(data.get(position),position);
-
}
-
-
-
public int getItemCount() {
-
return data.size();
-
}
-
}
-
}
水平的子RecyclerView的高度还是比较容易计算的,毕竟只有一行,高度相对来说是固定的。但是像GridView的高度是动态的,根据条目数量的不同,可能会有多行,所以我们需要先计算行数,然后每行的高度*行数才是子RecyclerView的高度
-
private class GridViewHolder extends BaseHolder<List<Integer>>{
-
-
private RecyclerView item_recyclerview;
-
-
private final int ONE_LINE_SHOW_NUMBER = 3;
-
-
private List<Integer> data;
-
-
public GridViewHolder(int viewId, ViewGroup parent, int viewType) {
-
super(viewId, parent, viewType);
-
item_recyclerview = (RecyclerView) itemView.findViewById(R.id.item_recyclerview);
-
-
}
-
-
-
public void refreshData(List<Integer> data, int position) {
-
super.refreshData(data, position);
-
this.data = data;
-
//每行显示3个,水平显示
-
item_recyclerview.setLayoutManager(new GridLayoutManager(MainActivity.this,ONE_LINE_SHOW_NUMBER,LinearLayoutManager.HORIZONTAL,false));
-
-
ViewGroup.LayoutParams layoutParams = item_recyclerview.getLayoutParams();
-
//计算行数
-
int lineNumber = data.size()%ONE_LINE_SHOW_NUMBER==0? data.size()/ONE_LINE_SHOW_NUMBER:data.size()/ONE_LINE_SHOW_NUMBER +1;
-
//计算高度=行数*每行的高度 +(行数-1)*10dp的margin + 10dp(为了居中)
-
//因为每行显示3个条目,为了保持正方形,那么高度应该是也是宽度/3
-
//高度的计算需要自己好好理解,否则会产生嵌套recyclerView可以滑动的现象
-
layoutParams.height = lineNumber *(screenWidth/3) + (lineNumber-1)*dip2px(10) + dip2px(10);
-
-
item_recyclerview.setLayoutParams(layoutParams);
-
-
item_recyclerview.setBackgroundResource(R.color.colorPrimary);
-
-
item_recyclerview.setAdapter(new GridAdapter());
-
}
-
-
-
private class GridAdapter extends RecyclerView.Adapter<BaseHolder>{
-
-
-
public BaseHolder onCreateViewHolder(ViewGroup parent, int viewType) {
-
return new ItemViewHolder(R.layout.item_x2_imageview,parent,viewType);
-
}
-
-
-
public void onBindViewHolder(BaseHolder holder, int position) {
-
holder.refreshData(data.get(position),position);
-
}
-
-
-
public int getItemCount() {
-
return data.size();
-
}
-
}
-
-
-
}
其他代码我就不贴了,想要看源码的可以直接下载:
https://github.com/z593492734/nesting-recylcerview
总体来说,RecyclerView嵌套RecyclerView是很简单的,而且也相当好用,希望这个demo可以给大家一些灵感。
下面是我修改后的例子:有任何问题都可以联系我:mengyuanzz@126.com
效果图:
源码下载:
http://download.csdn.net/detail/zhaihaohao1/9571152
转载地址: