实现底部导航栏和fragment，recyclerview结合的主页面

实现底部导航栏和fragment，recyclerview结合的主页面

具体是在一个fragment中加入输入框和一个recyclerview，搜索框中的指经过数据库处理方法后传给recyclerview,然后显示出来。

大致效果：

 主要代码：

xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="0dp"
    android:background="@drawable/bg_bg1"
    tools:context=".fragment.frag1.SearchFragment">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="      路  线  查  询"
        android:layout_marginTop="10dp"
        android:layout_marginLeft="80dp"
        android:layout_marginRight="160dp"
        android:textSize="21dp"/>
    <EditText
        android:layout_width="match_parent"
        android:layout_height="45dp"
        android:hint="    起始站"
        android:textSize="20dp"
        android:background="@drawable/bg_edit"
        android:id="@+id/frag_et_start"
        android:layout_marginTop="45sp"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="100dp"
        />
    <EditText
        android:layout_width="match_parent"
        android:layout_height="45dp"
        android:hint="    终点站"
        android:background="@drawable/bg_edit"
        android:textSize="20sp"
        android:id="@+id/frag_et_end"
        android:layout_marginTop="100dp"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="100dp"
        />
    <ImageButton
        android:id="@+id/frag_btn_find"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:layout_marginTop="70dp"
        android:layout_marginLeft="330dp"
        android:background="@mipmap/button_find"
        />

    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:layout_marginTop="165dp"
        android:background="@color/gray"
        />

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/frag_recycle_show"
        android:layout_width="match_parent"
        android:layout_height="453dp"
        android:layout_marginTop="170dp" />


</FrameLayout>

fragment

package com.example.dataapplication.fragment.frag1;
import android.nfc.Tag;
import android.os.Bundle;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.Toast;

import com.example.dataapplication.DataBase.CRUD;
import com.example.dataapplication.Infomation.SubwayBean;
import com.example.dataapplication.MenuActivity;
import com.example.dataapplication.R;
import com.example.dataapplication.adapter.ListViewAdapter;

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

public class SearchFragment extends Fragment {
    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";
    private String mParam1,mParam2;
    private EditText mEt_start,mEt_end;
    private ImageButton mBtn_search;
    private RecyclerView mList;
    private List<SubwayBean> mData;
    private String start,end;

    public SearchFragment() {

    }
    public static SearchFragment newInstance(String param1, String param2) {
        SearchFragment fragment = new SearchFragment();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    }
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        }
    }
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        return inflater.inflate(R.layout.fragment_search, container, false);
    }
    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        mEt_start  = view.findViewById(R.id.frag_et_start);
        mEt_end    = view.findViewById(R.id.frag_et_end);
        mBtn_search= view.findViewById(R.id.frag_btn_find);

        mList = view.findViewById(R.id.frag_recycle_show);



        mBtn_search.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                start=mEt_start.getText().toString();
                end=mEt_end.getText().toString();
                CRUD crud = new CRUD(getContext());
                if (crud.ArrayTransferStation(start,end)==null){
                    Toast.makeText(getContext(), "输入为空或查不到此数据", Toast.LENGTH_SHORT).show();
                }else {
                    initData();
                }

            }
        });



    }

    private void initData() {

            mData = new ArrayList<SubwayBean>();
            CRUD crud = new CRUD(getContext());
            //导入数据
            ArrayList<SubwayBean> subList = crud.ArrayTransferStation(start,end);

            for (int i = 0; i < subList.size(); i++) {

                SubwayBean subway = new SubwayBean();
                SubwayBean subData =subList.get(i);
                subway._StartStation = subData._StartStation;
                subway._EndStation = subData._EndStation;
                subway._Number = subData._Number;
                subway._Path = subData._Path;
                mData.add(subway);
            }
            //设置布局管理器
            LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getContext());
            mList.setLayoutManager(linearLayoutManager);
            //创建适配器
            ListViewAdapter adapter = new ListViewAdapter(mData);
            //设置到listview里
            mList.setAdapter(adapter);
    }

}