ListView——ArrayAdapter的用法

1.首先在Activity佈局中添加ListView標籤

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/lnlayout_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
<ListView
    android:id="@+id/lv_main"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"></ListView>
</LinearLayout>

2.代碼實現

package com.example.learning;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class MainActivity extends AppCompatActivity {
   //1.獲取ListView對象
    ListView listView = findViewById(R.id.lv_main);
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //2.準備數據源（Array）
        String[] data = {"Android","ListView","ArrayAdapter"};
        //3.準備適配器ArrayAdapter
        ArrayAdapter<String> adapter =new ArrayAdapter<String>(this,//context,上下文
                android.R.layout.simple_list_item_1,//int resourece,Android自帶的行佈局
                data);//obj 數據源
        //4.將適配器關聯到listView
        listView.setAdapter(adapter);
        
    }
}