使用RecyclerView的用处

对于RecyclerView来说，网上都有需要做法，但是对于这个RecyclerView来说，其实我们都会发现，其实他并没有一个友好的解决点击的问题，那么今天这边是根据自己的一个例子的记录一下自己对应RecyclerView的一部分理解与使用

这部分是Fragment的代码

public class MyFragment extends BaseFragment {

    private View mView;
    private RecyclerView mRecyclerView;
    private LinearLayoutManager mLinearLayoutManager;
    private MyListAdapter mMyListAdapter;
    private List<MyModel> mDatas = new ArrayList<>();
    private boolean isIMLogout = false;
    private boolean isMainLogout = false;
    private TextView mLogoutTv;
    private TextView mCarManager;


    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mDatas.add(new MyModel(R.drawable.bottom_tab_my, MyListAdapter.ITEM_TEXT_MORE_TYPE,  "个人信息"));
        mDatas.add(new MyModel(R.drawable.icon_collection, MyListAdapter.ITEM_TEXT_MORE_TYPE,  "车辆管理"));
        mDatas.add(new MyModel(R.drawable.icon_business, MyListAdapter.ITEM_TEXT_MORE_TYPE, "交接事务"));
        mDatas.add(new MyModel(R.drawable.icon_log, MyListAdapter.ITEM_TEXT_MORE_TYPE,  "当班日志"));
        mDatas.add(new MyModel(R.drawable.icon_manage, MyListAdapter.ITEM_TEXT_MORE_TYPE,  "人员管理"));

@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    if (mView == null) {
        mView = LayoutInflater.from(getContext()).inflate(R.layout.fragment_my, container, false);
        mRecyclerView = mView.findViewById(R.id.my_list);
        mMyListAdapter = new MyListAdapter();
        mRecyclerView.setAdapter(mMyListAdapter);
        mLinearLayoutManager = new LinearLayoutManager(getContext());
        mRecyclerView.setLayoutManager(mLinearLayoutManager);
        mRecyclerView.setAdapter(mMyListAdapter);
        mMyListAdapter.setItemClickListener(new OnRecyclerViewClickListener() {

            @Override
            public void onItemClickListener(View view) {
                int position = mRecyclerView.getChildAdapterPosition(view);
                switch (position){
                    case 0:
                        Toast.makeText(getContext(),"暂时无功能，等待开发",Toast.LENGTH_SHORT).show();
                        break;
                    case 1:
                        Intent intent = new Intent(getContext(),CarManagerActivity.class);
                        startActivity(intent);
                        break;
                    case 2:
                        Toast.makeText(getContext(),"暂时无功能，等待开发",Toast.LENGTH_SHORT).show();
                        break;
                    case 3:
                        Toast.makeText(getContext(),"暂时无功能，等待开发",Toast.LENGTH_SHORT).show();
                        break;
                    case 4:
                        Toast.makeText(getContext(),"暂时无功能，等待开发",Toast.LENGTH_SHORT).show();
                        break;
                }

            }

            @Override
            public void onItemLongClickListener(View view) {

            }
        });
        mRecyclerView.addItemDecoration(new DividerItemDecoration());
        mMyListAdapter.setmDatas(mDatas);
        mLogoutTv = mView.findViewById(R.id.my_logout);

也就是说我们需要这边设置一个Model,这个model也就是我们自己所用的那个item的信息，这边用一个List<Model>来存放，Model代码可以看下面的代码

public class MyModel {
    private int type;
    private String title;
    private int icon;

    public int getType() {
        return type;
    }

    public MyModel(int icon, int type, String title) {
        this.type = type;
        this.title = title;
        this.icon = icon;
    }

    public void setType(int type) {
        this.type = type;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public int getIcon() {
        return icon;
    }

    public void setIcon(int icon) {
        this.icon = icon;
    }
}

MyListAdapter也就是我们自己建立的一个适配器，具体代码可以看下面

public class MyListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    public final static int ITEM_TEXT_TYPE = 0;
    public final static int ITEM_TEXT_MORE_TYPE = 1;

    private List<MyModel> mDatas;
    private OnRecyclerViewClickListener listener;
    public void setItemClickListener(OnRecyclerViewClickListener itemClickListener) {
        listener = itemClickListener;
    }

    public MyListAdapter() {
        this.mDatas = new ArrayList<>();
    }

    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view;

//        if (getItemViewType(i) == ITEM_TEXT_TYPE) {
//            view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.layout_my_text_item, viewGroup, false);//
//            return new TextViewViewHolder(view);
//        } else {
            view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.layout_my_text_more_item, viewGroup, false);//这边就是绑定了布局，布局下面有
        if(listener != null){
            view.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    listener.onItemClickListener(v);
                }
            });

            view.setOnLongClickListener(new View.OnLongClickListener() {
                @Override
                public boolean onLongClick(View v) {
                    listener.onItemLongClickListener(v);
                    return true;
                }
            });
        }
            return new TextMoreViewHolder(view);


    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder viewHolder, int i) {
        if (viewHolder instanceof TextViewViewHolder) {
            final TextView textView = ((TextViewViewHolder) viewHolder).mTitle;
            textView.setText(mDatas.get(i).getTitle());
            textView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    textView.setClickable(true);
                }
            });

        } else if (viewHolder instanceof TextMoreViewHolder) {
            ((TextMoreViewHolder) viewHolder).mTitle.setText(mDatas.get(i).getTitle());//这边根据frgment那边传过来的东西来设置好数据
            ((TextMoreViewHolder) viewHolder).mIcon.setImageResource(mDatas.get(i).getIcon());
        }

    }



    public void setmDatas(List<MyModel> mDatas) {
        this.mDatas = mDatas;
        notifyDataSetChanged();
    }

    @Override
    public int getItemCount() {
        return mDatas.size();
    }


    @Override
    public int getItemViewType(int position) {
        LogUtils.DebugLog(MyListAdapter.class, String.valueOf(mDatas.get(position).getType()));
        return mDatas.get(position).getType();
    }

    public class TextViewViewHolder extends RecyclerView.ViewHolder {

        private TextView mTitle;

        public TextViewViewHolder(@NonNull View itemView) {
            super(itemView);
            mTitle = itemView.findViewById(R.id.my_text_item_title);
        }

    }

    public class TextMoreViewHolder extends RecyclerView.ViewHolder {
        private TextView mTitle;
        private ImageView mIcon;


        public TextMoreViewHolder(@NonNull View itemView) {
            super(itemView);
            mTitle = itemView.findViewById(R.id.my_text_more_title);//这边来绑定我们下面设置的那个id
            mIcon = itemView.findViewById(R.id.my_list_item_icon);
        }
    }
}

下面的是那个item的形成的xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    xmlns:tools="http://schemas.android.com/tools"
    android:background="#ffffff">

    <ImageView
        android:id="@+id/my_list_item_icon"
        android:layout_width="24dp"
        android:layout_height="24dp"
        android:src="@drawable/bottom_tab_my"
        android:layout_alignParentStart="true"
        android:layout_centerVertical="true"
        android:layout_marginStart="18dp"/>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:textColor="#303030"
        android:id="@+id/my_text_more_title"
        android:gravity="start|center_vertical"
        tools:text="个人资料"
        android:layout_marginStart="8dp"
        android:layout_toEndOf="@id/my_list_item_icon" />

    <TextView
        android:layout_width="20dp"
        android:layout_height="20dp"
        android:background="@drawable/icon_more_1"
        android:layout_centerVertical="true"
        android:layout_alignParentEnd="true"
        android:layout_marginEnd="18dp"/>

</RelativeLayout>

以后可以直接复用的

对于进行交流的问题，也就是我们需要来来要说的重点，具体的可以看下面的

①、创建接口类OnRecyclerViewClickListener

public interface OnRecyclerViewClickListener {

void onItemClickListener(View view);

void onItemLongClickListener(View view);

}

②、RecyclerView的Adapter中处理接口

Adapter中创建方法setItemClickListener（）
private OnRecyclerViewClickListener listener;

public void setItemClickListener(OnRecyclerViewClickListener itemClickListener) {

listener = itemClickListener;

}

在Adapter中onCreateViewHolder（）方法中将listener注册为Click回调监听

@Override

public FirstViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

View view = LayoutInflater.from(context).inflate(R.layout.item_first,null);

FirstViewHolder viewHolder = new FirstViewHolder(view);

//接口回调

if(listener != null){

view.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

listener.onItemClickListener(v);

}

});

view.setOnLongClickListener(new View.OnLongClickListener() {

@Override

public boolean onLongClick(View v) {

listener.onItemLongClickListener(v);

return true;

}

});

}

return viewHolder;

}

索引可以通过RecyclerView.getChildAdapterPosition获取到当前点击的Item的列表索引

int position = recyclerView.getChildAdapterPosition(view);

③、在Activity或Fragment中使用

FirstViewAdapter adapter = new FirstViewAdapter(context,strings);

recyclerView.setLayoutManager(new GridLayoutManager(context,2));

//添加Android自带的分割线

recyclerView.addItemDecoration(new DividerItemDecoration(this,DividerItemDecoration.VERTICAL));

recyclerView.setAdapter(adapter);

adapter.setItemClickListener(new OnRecyclerViewClickListener() {

@Override

public void onItemClickListener(View view) {

int position = recyclerView.getChildAdapterPosition(view);

switch (position){

case 0:

startActivity(new Intent(context,MainActivity.class));

break;

case 1:

startActivity(new Intent(context,BottomNavigationActivity.class));

break;

case 2:

startActivity(new Intent(context,TopTabActivity.class));

break;

case 3:

startActivity(new Intent(context,ListActivity.class));

break;

case 4:

startActivity(new Intent(context,RecyclerViewActivity.class));

break;

case 5:

startActivity(new Intent(context,RefreshAndLoadMoreActivity.class));

break;

case 6:

startActivity(new Intent(context,TabStopActivity.class));

break;

case 7:

startActivity(new Intent(context,FragmentAndRecyclerActivity.class));

break;

}

@Override

public void onItemLongClickListener(View view) {

}

});

使用RecyclerView的用处

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