如何使用ListView

情境

操作內建的ListView
可以透過SimpleAdapter來完成排版
但是對應的參數可以需要理解一下

程式碼說明

首先, xml如下

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">

    <ListView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/list_view"/>
</RelativeLayout>

接下來就直接在 onCreate 裡面初始化
然後宣告好想要塞入的字串
並且設定好按下的處理事件

public class MainActivity extends AppCompatActivity {
    private ListView listView;
    private String[] list = {"鉛筆","原子筆","鋼筆","毛筆","彩色筆"};
    private ArrayAdapter<String> listAdapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView = (ListView)findViewById(R.id.list_view);
        listAdapter = new ArrayAdapter(this,android.R.layout.simple_list_item_1,list);
        listView.setAdapter(listAdapter);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(getApplicationContext(), "你選擇的是" + list[position], Toast.LENGTH_SHORT).show();
            }
        });
    }
}

這樣就完成了內建的ListView

按下按鈕就會跳出訊息顯示你所按的 Item 資訊。