ListView的实现要有一个数组和一个单行的布局文件,同时还要有一个适配器将数组和ListView关联起来
不同内容的ListView,相应的采用不同的适配器
Item为单行文本的ListView,可以使用ArrayAdapter
代码如下:
ListView lv=new ListView(this); ArrayAdapter adapter=new Adapter(this,android.R.layout.simple_list_item_1,数组); lv.setAdapter(adapter); setContentView(lv);
如果Item有多个控件,那么可以使用SimpleAdapter
package com.example.listview1; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.widget.ListView; import android.widget.SimpleAdapter; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); ListView lv=new ListView(this); SimpleAdapter adapter=new SimpleAdapter(this,getData(),R.layout.simple_layout, new String[]{"name","num","grade"}, new int[]{R.id.name,R.id.num,R.id.grade}); lv.setAdapter(adapter); setContentView(lv); } public List<Map<String,Object>> getData() { List<Map<String,Object>> list=new ArrayList<Map<String,Object>>(); Map map=new HashMap(); map.put("name","student1"); map.put("num", "num1"); map.put("grade","grade1"); list.add(map); map=new HashMap(); map.put("name","student2"); map.put("num", "num2"); map.put("grade","grade2"); list.add(map); map=new HashMap(); map.put("name","student3"); map.put("num", "num3"); map.put("grade","grade3"); list.add(map); return list; } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } }
R.layout.simple_layout文件声明如下:
<?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="horizontal" > <TextView android:id="@+id/name" android:layout_width="wrap_content" android:layout_height="wrap_content" ></TextView> <TextView android:id="@+id/num" android:layout_width="wrap_content" android:layout_height="wrap_content" ></TextView> <TextView android:id="@+id/grade" android:layout_width="wrap_content" android:layout_height="wrap_content" ></TextView> </LinearLayout>
运行结果: