RecyclerView简单示例

Posted 2021-01-03 buyishi

MainActivity.java

package com.example.buish.myapp;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.Button;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    private RecyclerView recyclerView;
    private Button showButton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        recyclerView = findViewById(R.id.recyclerView);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        showButton = findViewById(R.id.showButton);
        showButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ArrayList<Person> persons = new ArrayList<>();
                persons.add(new Person("成龙", "男", "成龙大哥", R.mipmap.jackie_chan));
                persons.add(new Person("Bruce Lee", "男", "I know that Bruce Lee is the best!", R.mipmap.bruce_lee));
                persons.add(new Person("吴京", "男", "战狼", R.mipmap.wu_jing));
                persons.add(new Person("赵文卓", "男", "生死拳速", R.mipmap.zhao_wenzhuo));
                persons.add(new Person("Android", "Male", "I‘m a robot!", R.mipmap.ic_launcher_round));
                PersonRecyclerViewAdapter adapter = new PersonRecyclerViewAdapter(MainActivity.this, persons);
                recyclerView.setAdapter(adapter);
            }
        });
    }
}

Person.java

package com.example.buish.myapp;

public class Person {
    public String name;
    public String gender;
    public String whatsup;
    public int imageId;

    public Person(String name, String gender, String whatsup, int imageId) {
        this.name = name;
        this.gender = gender;
        this.whatsup = whatsup;
        this.imageId = imageId;
    }
}

PersonRecyclerViewAdapter.java

package com.example.buish.myapp;

import android.content.Context;
import android.support.annotation.NonNull;
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.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;

public class PersonRecyclerViewAdapter extends RecyclerView.Adapter<PersonRecyclerViewAdapter.PersonRecyclerViewHolder> {
    private Context context;
    private ArrayList<Person> persons;

    public PersonRecyclerViewAdapter(Context context, ArrayList<Person> persons) {
        this.context = context;
        this.persons = persons;
    }

    @NonNull
    @Override
    public PersonRecyclerViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item_person, viewGroup, false);
        return new PersonRecyclerViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull PersonRecyclerViewHolder holder, int i) {
        final Person person = persons.get(i);
        holder.personImageView.setImageResource(person.imageId);
        holder.personNameTextView.setText(person.name);
        holder.personGenderTextView.setText(person.gender);
        holder.personWhatsupTextView.setText(person.whatsup);
        holder.personLinearLayout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(context, person.whatsup, Toast.LENGTH_SHORT).show();
            }
        });
    }

    @Override
    public int getItemCount() {
        return persons.size();
    }

    class PersonRecyclerViewHolder extends RecyclerView.ViewHolder {
        LinearLayout personLinearLayout;
        ImageView personImageView;
        TextView personNameTextView, personGenderTextView, personWhatsupTextView;

        public PersonRecyclerViewHolder(@NonNull View itemView) {
            super(itemView);
            personLinearLayout = itemView.findViewById(R.id.personLinearLayout);
            personImageView = itemView.findViewById(R.id.personImageView);
            personNameTextView = itemView.findViewById(R.id.personNameTextView);
            personGenderTextView = itemView.findViewById(R.id.personGenderTextView);
            personWhatsupTextView = itemView.findViewById(R.id.whatsupTextView);
        }
    }
}

activity_main.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="match_parent"
    android:orientation="vertical">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

    <Button
        android:id="@+id/showButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="显示" />
</LinearLayout>

item_person.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/personLinearLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginBottom="10dp"
    android:background="@android:color/white"
    android:orientation="horizontal">

    <ImageView
        android:id="@+id/personImageView"
        android:layout_width="50dp"
        android:layout_height="50dp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="5dp">

            <LinearLayout
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1">

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="名称：" />

                <TextView
                    android:id="@+id/personNameTextView"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content" />
            </LinearLayout>

            <LinearLayout
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1">

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="性别：" />

                <TextView
                    android:id="@+id/personGenderTextView"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content" />
            </LinearLayout>
        </LinearLayout>

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="个性签名：" />

            <TextView
                android:id="@+id/whatsupTextView"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />
        </LinearLayout>
    </LinearLayout>
</LinearLayout>