Android 数组适配器(ArrayAdapter)

1，编写xml代码

<?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">
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="智慧校园"
        android:textSize="50dp"
        ></TextView>

        <ListView
            android:id="@+id/list"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            />
</LinearLayout>

2，编写类

package com.example.listviewtest;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
//    这三个东西 显示 数据
    private ListView list;
    private  String[] data ={"企业会话","办公邮件","账务信息查询"};

    private ArrayAdapter<String> adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

//        找id
        list = (ListView)findViewById(R.id.list);

//        实例化
        adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,data);

//        添加数据 ；
        list.setAdapter(adapter);

//        渲染数据 ；

        list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(getApplicationContext(),data[position],Toast.LENGTH_SHORT).show();
//                data[position] ==>((TextView)view).getText()
//                adapter.getItem(position);
            }
        });


    }
}

3，运行结果截图