recyclerview实现类似计算器布局

首先上图：

 recycler_item.xml

<?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="69px"
    android:clickable="true"
    android:id="@+id/layout">

    <TextView
        android:layout_width="80px"
        android:layout_height="69px"
        android:background="@drawable/gv_grid_selector"
        android:text="Medium Text"
        android:layout_gravity="center"
        android:gravity="center"
        android:id="@+id/textView" />

</LinearLayout>

recyclerview的设置

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_marginTop="200px"
        android:layout_width="350px"
        android:layout_height="230px"/>

fragment代码：

package com.example.navigation;

import android.content.Context;
import android.graphics.Rect;
import android.net.Uri;
import android.os.Bundle;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.navigation.Navigation;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import androidx.recyclerview.widget.StaggeredGridLayoutManager;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;


public class FragmentOne extends Fragment {
    private View mRootView;
    private RecyclerView recyclerView;
    private PlayListAdapter adapter;
    private List<Playlist_Info> list = new ArrayList<>();
    String[] data = {"1", "2", "3", "0", "4", "5", "6", "7", "8", "9"};
    private DividerItemDecoration itemDecoration;
    private int height_80 = 0;


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        mRootView = inflater.inflate(R.layout.fragment_one, container, false);
        height_80 = getResources().getDimensionPixelOffset(R.dimen.height_80);
        //找到 RecyclerView
        RecyclerView recylcer = mRootView.findViewById(R.id.recyclerView);
        //ListView效果的 LinearLayoutManager
        //LinearLayoutManager mgr = new LinearLayoutManager(this);
        //VERTICAL纵向，类似ListView，HORIZONTAL横向，类似Gallery
        //mgr.setOrientation(LinearLayoutManager.HORIZONTAL);

        //GridLayout 3列
        //GridLayoutManager mgr=new GridLayoutManager(this,3);

        //3列   方向垂直
        StaggeredGridLayoutManager mgr = new StaggeredGridLayoutManager(4, StaggeredGridLayoutManager.VERTICAL);
        SpacesItemDecoration spacesItemDecoration = new SpacesItemDecoration(new Rect(0,13,0,0));
        spacesItemDecoration.setCalculator(1);
        recylcer.addItemDecoration(spacesItemDecoration);
        recylcer.setLayoutManager(mgr);
        //设置适配器
        recylcer.setAdapter(new MyAdapter());
        return mRootView;
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        Button fragment_two = view.findViewById(R.id.btn_go_to_fragment_two);
        fragment_two.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Navigation.findNavController(view).navigate(R.id.action_fragmentOne_to_fragmentTwo);
            }
        });

    }

    //继承自 RecyclerView.Adapter
    class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {

        //RecyclerView显示的子View
        //该方法返回是ViewHolder，当有可复用View时，就不再调用
        @Override
        public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
            View v = getLayoutInflater().inflate(R.layout.recycler_item, null);
            return new ViewHolder(v);
        }

        //将数据绑定到子View
        @Override
        public void onBindViewHolder(ViewHolder viewHolder, int i) {
            viewHolder.textView.setText(data[i]);
            if(data[i].equals("0")){
                LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
                        LinearLayout.LayoutParams.MATCH_PARENT,
                        233);
                viewHolder.textView.setLayoutParams(lp);
            }

        }

        //RecyclerView显示数据条数
        @Override
        public int getItemCount() {
            return data.length;
        }

        //自定义的ViewHolder,减少findViewById调用次数
        class ViewHolder extends RecyclerView.ViewHolder {

            TextView textView;

            public ViewHolder(View itemView) {
                super(itemView);
                textView = (TextView) itemView.findViewById(R.id.textView);
            }
        }
    }

}

SpacesItemDecoration.java

package com.example.navigation;

import android.graphics.Rect;
import android.view.View;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

public class SpacesItemDecoration extends RecyclerView.ItemDecoration {
    private int left;
    private int right;
    private int top;
    private int bottom;
    private int status;

    public SpacesItemDecoration(Rect rect)
    {
        this.left = rect.left;
        this.right = rect.right;
        this.top = rect.top;
        this.bottom = rect.bottom;
    }

    public void setCalculator(int status)
    {
        this.status = status;
    }

    @Override
    public void getItemOffsets(@NonNull Rect outRect, @NonNull View view, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {
        outRect.left = this.left;
        outRect.bottom = this.bottom;
        int childcount = parent.getAdapter().getItemCount();
        //由于每行都只有5个，所以第一个都是5的倍数，把左边距设为0
        if (parent.getChildLayoutPosition(view) %4==0) {
            outRect.left = 0;
        }
        if(this.status == 1)
        {
            if(parent.getChildLayoutPosition(view) >3)
            {
                outRect.top = 13;
            }
        }
    }
}