安卓Recycleview简单的网格布局-初学者的关键点

导包

def supportVersion = '28.0.0' 定义常量我的sdk版本为28  

implementation "com.android.support:recyclerview-v7:$supportVersion"
implementation "com.android.support:cardview-v7:$supportVersion"
implementation 'com.github.CymChad:BaseRecyclerViewAdapterHelper:2.9.42'
implementation 'com.yqritc:recyclerview-flexibledivider:1.4.0'
依赖代码为

def supportVersion = '28.0.0'

dependencies {

    implementation fileTree(dir: 'libs', include: ['*.jar'])

    implementation 'androidx.appcompat:appcompat:1.0.0-beta01'

    implementation 'android.arch.navigation:navigation-fragment:1.0.0-alpha09'

    implementation 'androidx.constraintlayout:constraintlayout:1.1.2'

    testImplementation 'junit:junit:4.12'

    androidTestImplementation 'androidx.test:runner:1.1.0-alpha4'

    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0-alpha4'

    implementation "com.android.support:recyclerview-v7:$supportVersion"

    implementation "com.android.support:cardview-v7:$supportVersion"

    implementation 'com.github.CymChad:BaseRecyclerViewAdapterHelper:2.9.42'

    implementation 'com.yqritc:recyclerview-flexibledivider:1.4.0'

}

依赖

Adapter代码（解释都在上面）

package com.example.imageload.adapter;

import com.chad.library.adapter.base.BaseQuickAdapter;

import com.chad.library.adapter.base.BaseViewHolder;

import com.example.imageload.R;

import com.example.imageload.bean.GridBean;

import java.util.List;

//记得这里添加泛型

public class MyGridAdapter extends BaseQuickAdapter<GridBean, BaseViewHolder> {

  //  private List data=null;

    public MyGridAdapter(int layoutResId, List data) {

        super(layoutResId, data);//这里设置你的布局 Main窗口传入你的数据这里转换了封装了一下传到了convert 下的GridBean item（怎么转换你不用guan）

        //layoutResId 为你单个属性布局的ID 假如你要再屏幕上显示5张图片这个就传入你一张图片的布局文件 剩下那四张也用这个布局  要跟androidx.recyclerview.widget.RecyclerView分开

    }

    @Override

    protected void convert(BaseViewHolder helper, GridBean item) {

   helper.setText(R.id.textView_list,item.getTitle());//设置值

    helper.setImageResource(R.id.img_list,item.getImageResourse());

   helper.addOnClickListener(R.id.my_button);//添加事件

   helper.addOnClickListener(R.id.my_button2);

    }

}

bean

package com.example.imageload.bean;

public class GridBean {

    private String title;

    private  int imageResourse;

    public GridBean(String title, int imageResourse) {

        this.title = title;

        this.imageResourse = imageResourse;

    }

    public String getTitle() {

        return title;

    }

    public void setTitle(String title) {

        this.title = title;

    }

    public int getImageResourse() {

        return imageResourse;

    }

    public void setImageResourse(int imageResourse) {

        this.imageResourse = imageResourse;

    }

}

Main窗口

package com.example.imageload;

import androidx.appcompat.app.AppCompatActivity;

import androidx.recyclerview.widget.GridLayoutManager;

import androidx.recyclerview.widget.RecyclerView;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.widget.Toast;

import com.chad.library.adapter.base.BaseQuickAdapter;

import com.example.imageload.adapter.MyGridAdapter;

import com.example.imageload.bean.GridBean;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    private ArrayList<GridBean> mDataList = new ArrayList<>();    //主窗口list集合

    private RecyclerView recyclerView;

    MyGridAdapter myAdapter;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);//设置主布局

        recyclerView = findViewById(R.id.my_list);

        recyclerView.setLayoutManager(new GridLayoutManager(this, ));

        initData();

        initAdapter();

    }

    private void initAdapter() {

        //这里问什么不用viewholder？viewhodler除了缓存？有什么用

        myAdapter = new MyGridAdapter(R.layout.my_item, mDataList);

        myAdapter.setOnItemChildClickListener(new BaseQuickAdapter.OnItemChildClickListener() {

            @Override

            public void onItemChildClick(BaseQuickAdapter adapter, View view, int position) {

                switch (view.getId())

                { case R.id.my_button:

                    Toast.makeText(MainActivity.this,"child按钮一被单机"+position,Toast.LENGTH_SHORT).show();

                    break;

                    case  R.id.my_button2:

                        Toast.makeText(MainActivity.this,"按钮2被单机"+position,Toast.LENGTH_SHORT).show();

                        break;

                }

            }

        });

        myAdapter.setOnItemClickListener(new BaseQuickAdapter.OnItemClickListener() {

            @Override

            public void onItemClick(BaseQuickAdapter adapter, View view, int position) {

                switch (position)

                { case :

//                    Intent intent= new Intent();

//                    intent.setClass(MainActivity.this,SectionActivity.class);

//                    startActivity(intent);

                    break;

                }

                Toast.makeText(MainActivity.this,"你点击了"+position,Toast.LENGTH_SHORT).show();

            }

        });

        recyclerView.setAdapter(myAdapter);//记得add

        Log.i("Mainact","初始化adapter");

    }

    private  void initData()

    {

        for (int i=;i<;i++)

        {

            GridBean b=new GridBean("第"+i+"个例子",R.mipmap.ic_launcher);

            mDataList.add(b);

        }

    }

}

主布局文件 activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context=".MainActivity">

    <androidx.recyclerview.widget.RecyclerView

        android:id="@+id/my_list"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        />

</LinearLayout>

单个布局文件my_item.xml

<?xml version="1.0" encoding="utf-8"?>

<androidx.cardview.widget.CardView android:id="@+id/card_view"

    android:layout_width="match_parent"

    android:layout_height="wrap_content"

    android:layout_gravity="center"

    android:foreground="?android:attr/selectableItemBackground"

    xmlns:android="http://schemas.android.com/apk/res/android"

    >

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content">

    </LinearLayout>

    <LinearLayout

        android:layout_gravity="center"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:orientation="vertical">

        <TextView

            android:id="@+id/dialog"

            android:layout_width="80dp"

            android:layout_height="80dp"

            android:layout_centerInParent="true"

            android:background="#9DDE76"

            android:gravity="center"

            android:textColor="#ffffffff"

            android:textSize="30dp"

            android:visibility="invisible" />

        <ImageView

            android:id="@+id/img_list"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_gravity="center"

            android:src="@android:mipmap/sym_def_app_icon" />

        <TextView

            android:id="@+id/textView_list"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="TextView"

            android:layout_gravity="center"

            android:textAlignment="center" />

        <Button

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_gravity="center"

            android:id="@+id/my_button"

            android:text="点我测试"

            />

        <Button

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_gravity="center"

            android:id="@+id/my_button2"

            android:text="点我测试2"

            />

    </LinearLayout>

</androidx.cardview.widget.CardView>

理解就很好理解了 不贴代码了贴图（添加装饰什么的百度，上面也有点我注释了）