如何使用RecyclerView仿應用列表實現網格布局

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詳細代碼

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子項列表布局

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="鬧鐘"    android:textColor="#fff"    android:textSize="28sp" /></LinearLayout>

JAVA代碼

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","設置", R.mipmap.ic_launcher));    mApplyList.add(new ApplyBean("CALCULATOR","計算器", R.mipmap.ic_launcher));    mApplyList.add(new ApplyBean("WEATHER","天氣", R.mipmap.ic_launcher));    mApplyList.add(new ApplyBean("CALENDAR","日歷", R.mipmap.ic_launcher));    mApplyList.add(new ApplyBean("PHOTO" ,"相冊", R.mipmap.ic_launcher));    mApplyList.add(new ApplyBean("TIME" ,"時鐘", R.mipmap.ic_launcher));    mApplyList.add(new ApplyBean("FM" ,"收音機", R.mipmap.ic_launcher));    mApplyList.add(new ApplyBean("CAMERA" ,"相機", R.mipmap.ic_launcher));    mApplyList.add(new ApplyBean("PLAY","播放器", R.mipmap.ic_launcher));    mGridAdapter = new GridAdapter(mApplyList);     //這里的第二個參數4代表的是網格的列數    mRecyclerView.setLayoutManager(new GridLayoutManager(this, 3));    mRecyclerView.setAdapter(mGridAdapter);  }}

RecyclerView適配器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 * 日期時間: 2019/9/1 17:45 * 內容描述: * 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);    //對加載的子項注冊監聽事件    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;  }   /**   * 定義RecyclerView選項單擊事件的回調接口   */  public interface OnItemClickListener{     /**     * @param view 當前單擊的View     * @param applyId 單擊的View的應用id     */    void onItemClick(View view, String applyId);  }   class Holder extends RecyclerView.ViewHolder {    private TextView mApplyNameTv;    private ImageView mApplyImageIv;    private View fruitView;  //表示我們自定義的控件的視圖    public Holder(View itemView) {      super(itemView);      fruitView = itemView;      mApplyNameTv = itemView.findViewById(R.id.tv_apply_name);      mApplyImageIv = itemView.findViewById(R.id.iv_apply_image);    }  }}

應用列表實體類ApplyBean

package com.matt.recyclerview; import android.os.Parcel;import android.os.Parcelable; /** * @author matt.liaojianpeng * 日期時間: 2019/9/1 16:31 * 內容描述: * 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();  }}

詳細講解

設置RecyclerView適配器

//這里的第二個參數3代表的是網格的列數mRecyclerView.setLayoutManager(new GridLayoutManager(this, 3));mRecyclerView.setAdapter(mGridAdapter);

可以設置的一些參數，說明如下:

setLayoutManager設置RecyclerView布局樣式

GridLayoutManager：網格布局

LinearLayoutManager：線性布局

適配器GridAdapter繼承RecyclerView.Adapter

初始化

重寫構造方法，傳入子項數據列表

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

內部類Holder用于綁定數據類型

class Holder extends RecyclerView.ViewHolder {    private TextView mApplyNameTv;    private ImageView mApplyImageIv;    private View fruitView;  //表示我們自定義的控件的視圖    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，負責承載每個子項的布局。

onBindViewHolder()方法，負責將每個子項holder綁定數據。

getItemCount()方法，返回子項列表數目。

setOnItemClickListener()方法，設置子項列表監聽。

OnItemClickListener()接口，定義RecyclerView選項單擊事件的回調接口。

子項監聽實現的方法，如下

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

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