大连市自然资源局/优化网站快速排名软件
最近项目中有一个需求是RecyclerView中的Item中嵌套RecyclerView，在网上没找到什么资料，然后就自己尝试了一下。
首先看一下效果图
录制GIF现在不大方便，就直接上两个图了。
关于RecyclerView，都已经很熟悉了不熟悉的去百度一下，这里就不多介绍了。
先说一下需求，最外层的是一个RecyclerView是竖向的，然后外层RecyclerView里面Item中的RecyclerView是GridManager。
我们先看一下具体的代码：
最外层的布局代码：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><android.support.v7.widget.RecyclerViewandroid:id="@+id/rvMultipleItem"android:layout_width="match_parent"android:layout_height="match_parent"/></LinearLayout>public class MultipleActivity extends AppCompatActivity {
private static final String TAG = "MultipleActivity";
RecyclerView mRecyclerView;
TopCategoryBean mCategoryBean = new TopCategoryBean();
MultipleAdapter mMultipleAdapter;@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_multiple);mRecyclerView = (RecyclerView) findViewById(R.id.rvMultipleItem);mMultipleAdapter = new MultipleAdapter(this, mCategoryBean);mRecyclerView.setLayoutManager(new LinearLayoutManager(this));new Thread(new Runnable() {@Overridepublic void run() {try {URL url = new URL("http://api.zhuishushenqi.com/cats/lv2/statistics");HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();urlConnection.setRequestMethod("GET");urlConnection.setConnectTimeout(60000);urlConnection.setConnectTimeout(10000);int responseCode = urlConnection.getResponseCode();if (responseCode == 200) {InputStream inputStream = urlConnection.getInputStream();BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));StringBuilder sb = new StringBuilder();String line = null;while ((line = reader.readLine()) != null) {sb.append(line);}Gson gson = new Gson();final TopCategoryBean categoryBean = gson.fromJson(sb.toString(), TopCategoryBean.class);Log.i(TAG,"-------->"+categoryBean);runOnUiThread(new Runnable() {@Overridepublic void run() {mMultipleAdapter.setCategoryBean(categoryBean);mRecyclerView.setAdapter(mMultipleAdapter);}});}} catch (MalformedURLException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}}).start();
}
}
最外层的布局文件就是一个RecyclerView控件，然后在Java代码中必须要设置LinearLayoutManager，然后就没什么很难的实现了。
接着是适配器的代码：
public class MultipleAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private static final String TAG = "MultipleAdapter";
private Context mContext;
private LayoutInflater mInflater;
private TopCategoryBean mCategoryBean;public MultipleAdapter(Context context, TopCategoryBean categoryBean) {mContext = context;mInflater = LayoutInflater.from(mContext);mCategoryBean = categoryBean;
}public void setCategoryBean(TopCategoryBean categoryBean) {mCategoryBean = categoryBean;notifyDataSetChanged();
}@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {View view = mInflater.inflate(R.layout.item_multiple_normal, parent, false);return new NormalItemViewHolder(view);
}@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {NormalItemViewHolder viewHolder = (NormalItemViewHolder) holder;RecyclerView rvCategory = viewHolder.mRvCategory;rvCategory.setHasFixedSize(true);rvCategory.setLayoutManager(new GridLayoutManager(mContext, 3));List<TopCategoryBean.MaleBean> male = mCategoryBean.getMale();List<TopCategoryBean.MaleBean> female = mCategoryBean.getFemale();CategoryAdapter adapter = new CategoryAdapter(male);if (position == 0) {viewHolder.mTextView.setText("男生");adapter.setCategoryBeans(male);} else if (position == 1) {viewHolder.mTextView.setText("女生");adapter.setCategoryBeans(female);} else if (position == 2) {viewHolder.mTextView.setText("耽美");adapter.setCategoryBeans(mCategoryBean.getPicture());} else if (position == 3) {viewHolder.mTextView.setText("出版");adapter.setCategoryBeans(mCategoryBean.getPress());}rvCategory.setAdapter(adapter);
}@Override
public int getItemCount() {return 4;
}private class CategoryAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {List<TopCategoryBean.MaleBean> mCategoryBeans;public CategoryAdapter(List<TopCategoryBean.MaleBean> maleBeans) {mCategoryBeans = maleBeans;}public void setCategoryBeans(List<TopCategoryBean.MaleBean> categoryBeans) {mCategoryBeans = categoryBeans;notifyDataSetChanged();}@Overridepublic RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {View view = mInflater.inflate(R.layout.item_category, parent, false);return new ItemViewHolder(view);}@Overridepublic void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {ItemViewHolder viewHolder = (ItemViewHolder) holder;final TopCategoryBean.MaleBean maleBean = mCategoryBeans.get(position);viewHolder.mTvBookCount.setText(maleBean.getBookCount() + "本");viewHolder.mTvCategoryName.setText(maleBean.getName());viewHolder.itemView.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {}});}@Overridepublic int getItemCount() {return mCategoryBeans.size();}class ItemViewHolder extends RecyclerView.ViewHolder {TextView mTvCategoryName;TextView mTvBookCount;CardView llItem;public ItemViewHolder(View itemView) {super(itemView);mTvCategoryName = itemView.findViewById(R.id.tvCategoryName);mTvBookCount = itemView.findViewById(R.id.tvBookCount);llItem = itemView.findViewById(R.id.llItem);}}
}private class NormalItemViewHolder extends RecyclerView.ViewHolder {TextView mTextView;RecyclerView mRvCategory;public NormalItemViewHolder(View itemView) {super(itemView);mTextView = itemView.findViewById(R.id.tvName);mRvCategory = itemView.findViewById(R.id.rvCategory);}
}}
适配器这里我没做封装，直接用最原始的写法，需要注意的一点是：我这里最外层的Item数只有4个，我就直接写死了4个，具体的项目中而已根据需求来实现。
外层Item的布局代码：
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginEnd="3dp"
android:layout_marginStart="3dp"
android:layout_marginTop="3dp"
android:orientation="vertical"
android:padding="10dp"
app:cardCornerRadius="3dp"
app:cardElevation="3dp"><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="vertical"><TextViewandroid:id="@+id/tvName"android:layout_width="match_parent"android:layout_height="wrap_content"android:padding="10dp"android:text="男生"android:textSize="16sp"/><Viewandroid:layout_width="match_parent"android:layout_height="1dp"android:layout_marginEnd="2dp"android:layout_marginStart="10dp"android:background="#FF0000"/><android.support.v7.widget.RecyclerViewandroid:id="@+id/rvCategory"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_marginStart="5dp"android:padding="10dp"/>
</LinearLayout>
</android.support.v7.widget.CardView>
这个布局里面用了一个recyclerView控件。我们需要在最外层的适配器中给这个RecyclerView添加一个适配器。
private class CategoryAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {List<TopCategoryBean.MaleBean> mCategoryBeans;public CategoryAdapter(List<TopCategoryBean.MaleBean> maleBeans) {mCategoryBeans = maleBeans;}public void setCategoryBeans(List<TopCategoryBean.MaleBean> categoryBeans) {mCategoryBeans = categoryBeans;notifyDataSetChanged();}@Overridepublic RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {View view = mInflater.inflate(R.layout.item_category, parent, false);return new ItemViewHolder(view);}@Overridepublic void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {ItemViewHolder viewHolder = (ItemViewHolder) holder;final TopCategoryBean.MaleBean maleBean = mCategoryBeans.get(position);viewHolder.mTvBookCount.setText(maleBean.getBookCount() + "本");viewHolder.mTvCategoryName.setText(maleBean.getName());viewHolder.itemView.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {}});}@Overridepublic int getItemCount() {return mCategoryBeans.size();}class ItemViewHolder extends RecyclerView.ViewHolder {TextView mTvCategoryName;TextView mTvBookCount;CardView llItem;public ItemViewHolder(View itemView) {super(itemView);mTvCategoryName = itemView.findViewById(R.id.tvCategoryName);mTvBookCount = itemView.findViewById(R.id.tvBookCount);llItem = itemView.findViewById(R.id.llItem);}}
}
这是里面适配器的代码，使用的时候跟别的地方使用一样，需要注意的是布局管理器设置成GridLayoutManager，因为需求里面是GridLayout的，这样就能实现RecyclerView里面嵌套RecyclerView。
这里写的不是很好，具体需要了解的可以去看一下代码：传送门