RecyclerView仿应用列表实现网格布局

简介

使用RecyclerView实现网格布局，实现手机界面应用列表

效果

效果如下图：

详细代码

XML布局文件

在布局中使用RecyclerView控件

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"
  android:orientation="vertical"
  tools:context=".MainActivity"
  android:background="#9709F7">

  <androidx.recyclerview.widget.RecyclerView
    android:id="@+id/recyclerview"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

</LinearLayout>

RecyclerView子项列表布局

recyclerview_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="220dp"
  android:layout_height="220dp"
  android:background="#20FDFDFD"
  android:gravity="center_horizontal"
  android:orientation="vertical"
  android:layout_margin="20dp">

  <ImageView
    android:id="@+id/iv_apply_image"
    android:layout_width="112dp"
    android:layout_height="112dp"
    android:layout_marginTop="32dp"
    android:src="@mipmap/ic_launcher" />

  <TextView
    android:id="@+id/tv_apply_name"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="19dp"
    android:text="闹钟"
    android:textColor="#fff"
    android:textSize="28sp" />
</LinearLayout>

JAVA代码

MainActivity

package com.matt.recyclerview;

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.os.Bundle;

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

public class MainActivity extends AppCompatActivity {

  private RecyclerView mRecyclerView;
  private GridAdapter mGridAdapter;
  private List<ApplyBean> mApplyList;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mRecyclerView = findViewById(R.id.recyclerview);
    mApplyList = new ArrayList<>();
    mApplyList.add(new ApplyBean("SETTINGS","设置", R.mipmap.ic_launcher));
    mApplyList.add(new ApplyBean("CALCULATOR","计算器", R.mipmap.ic_launcher));
    mApplyList.add(new ApplyBean("WEATHER","天气", R.mipmap.ic_launcher));
    mApplyList.add(new ApplyBean("CALENDAR","日历", R.mipmap.ic_launcher));
    mApplyList.add(new ApplyBean("PHOTO" ,"相册", R.mipmap.ic_launcher));
    mApplyList.add(new ApplyBean("TIME" ,"时钟", R.mipmap.ic_launcher));
    mApplyList.add(new ApplyBean("FM" ,"收音机", R.mipmap.ic_launcher));
    mApplyList.add(new ApplyBean("CAMERA" ,"相机", R.mipmap.ic_launcher));
    mApplyList.add(new ApplyBean("PLAY","播放器", R.mipmap.ic_launcher));
    mGridAdapter = new GridAdapter(mApplyList);

    //这里的第二个参数4代表的是网格的列数
    mRecyclerView.setLayoutManager(new GridLayoutManager(this, 3));
    mRecyclerView.setAdapter(mGridAdapter);
  }
}

RecyclerView适配器GridAdapter

package com.fenda.homepage.Adapter;

import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import com.fenda.homepage.R;
import com.fenda.homepage.bean.ApplyBean;

import java.util.List;

/**
 * @author：Matt.Liao
 * 日期时间: 2019/9/1 17:45
 * 内容描述:
 * 版本：
 * 包名：
 */
public class GridAdapter extends RecyclerView.Adapter<GridAdapter.Holder>{
  private List<ApplyBean> mList;
  private RecyclerView recyclerView;
  public GridAdapter(List<ApplyBean> list){
    this.mList = list;
  }

  @Override
  public Holder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.submenu_item_recyclerview, null);
    final Holder holder = new Holder(view);
    //对加载的子项注册监听事件
    holder.fruitView.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View view) {
        int position = holder.getAdapterPosition();
        String applyId = mList.get(position).getApplyId();
        onItemClickListener.onItemClick(view ,applyId);
      }
    });
    return holder;
  }

  @Override
  public void onBindViewHolder(Holder holder, int position) {
    holder.mApplyNameTv.setText(mList.get(position).getApplyName());
    holder.mApplyImageIv.setImageResource(mList.get(position).getApplyImage());
  }

  @Override
  public int getItemCount() {
    return mList == null ? 0 : mList.size();
  }

  private OnItemClickListener onItemClickListener;
  public void setOnItemClickListener(OnItemClickListener onItemClickListener){
    this.onItemClickListener = onItemClickListener;
  }

  /**
   * 定义RecyclerView选项单击事件的回调接口
   */
  public interface OnItemClickListener{

    /**
     * @param view 当前单击的View
     * @param applyId 单击的View的应用id
     */
    void onItemClick(View view, String applyId);
  }

  class Holder extends RecyclerView.ViewHolder {
    private TextView mApplyNameTv;
    private ImageView mApplyImageIv;
    private View fruitView;  //表示我们自定义的控件的视图
    public Holder(View itemView) {
      super(itemView);
      fruitView = itemView;
      mApplyNameTv = itemView.findViewById(R.id.tv_apply_name);
      mApplyImageIv = itemView.findViewById(R.id.iv_apply_image);
    }
  }
}

应用列表实体类ApplyBean

package com.matt.recyclerview;

import android.os.Parcel;
import android.os.Parcelable;

/**
 * @author matt.liaojianpeng
 * 日期时间: 2019/9/1 16:31
 * 内容描述:
 * 版本：
 * 包名：
 */
public class ApplyBean{
  private String applyId;
  private String applyName;
  private int applyImage;

  public String getApplyId() {
    return applyId;
  }

  public void setApplyId(String applyId) {
    this.applyId = applyId;
  }

  public ApplyBean(String applyName, int applyImage){
    this.applyName = applyName;
    this.applyImage = applyImage;
  }
  public ApplyBean(String applyId , String applyName, int applyImage){
    this.applyId = applyId;
    this.applyName = applyName;
    this.applyImage = applyImage;
  }
  public ApplyBean() {
  }

  public String getApplyName() {
    return applyName;
  }

  public void setApplyName(String applyName) {
    this.applyName = applyName;
  }

  public int getApplyImage() {
    return applyImage;
  }

  public void setApplyImage(int applyImage) {
    this.applyImage = applyImage;
  }
  public ApplyBean(Parcel source) {
    applyId = source.readString();
    applyName = source.readString();

    applyImage = source.readInt();
  }
}

详细讲解 

设置RecyclerView适配器

//这里的第二个参数3代表的是网格的列数
mRecyclerView.setLayoutManager(new GridLayoutManager(this, 3));
mRecyclerView.setAdapter(mGridAdapter);

可以设置的一些参数，说明如下:

setLayoutManager设置RecyclerView布局样式

GridLayoutManager：网格布局

LinearLayoutManager：线性布局

适配器GridAdapter继承RecyclerView.Adapter

初始化

重写构造方法，传入子项数据列表

private List<ApplyBean> mList;
  private RecyclerView recyclerView;
  public GridAdapter(List<ApplyBean> list){
    this.mList = list;
  }

内部类Holder用于绑定数据类型

class Holder extends RecyclerView.ViewHolder {
    private TextView mApplyNameTv;
    private ImageView mApplyImageIv;
    private View fruitView;  //表示我们自定义的控件的视图
    public Holder(View itemView) {
      super(itemView);
      fruitView = itemView;
      mApplyNameTv = itemView.findViewById(R.id.tv_apply_name);
      mApplyImageIv = itemView.findViewById(R.id.iv_apply_image);
    }
  }

onCreateViewHolder()方法，负责承载每个子项的布局。

onBindViewHolder()方法，负责将每个子项holder绑定数据。

getItemCount()方法，返回子项列表数目。

setOnItemClickListener()方法，设置子项列表监听。

OnItemClickListener()接口，定义RecyclerView选项单击事件的回调接口。

子项监听实现的方法，如下

mGridAdapter.setOnItemClickListener(new GridAdapter.OnItemClickListener() {
      @Override
      public void onItemClick(View view, String applyId) {
        if(applyId.equals("SETTINGS")){
          Toast.makeText(getApplicationContext(),"设置",Toast.LENGTH_SHORT).show();
        } else if (applyId.equals("CALCULATOR")){
          Toast.makeText(getApplicationContext(),"计算器",Toast.LENGTH_SHORT).show();
        }
      }
    });

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