Android ListView列表視圖的使用方法
前言
當(dāng)你要將某個(gè)從數(shù)據(jù)庫或者文件中獲得相當(dāng)大的數(shù)據(jù),在界面中向用戶展示的時(shí)候,由于定義一個(gè)個(gè)視圖比較麻煩,Android中提供了類似于數(shù)組的控件–ListView。
使用方法:
假設(shè)我們要轉(zhuǎn)的數(shù)據(jù)是一個(gè)Person對象數(shù)組
package cn.zhuangzhihuang.mylist; public class Person { private String name; private String tel; public Person(String name, String tel) { super(); this.name = name; this.tel = tel; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getTel() { return tel; } public void setTel(String tel) { this.tel = tel; } public String toString() { return "點(diǎn)擊的聯(lián)系人為" + this.getName() +"\n電話號碼為" + this.getTel(); } }
Person[] DB = { new Person("張三","18555555555"), new Person("李四","18555555556"), new Person("王五","18555555557"), new Person("趙六","18555555558"), new Person("鄧七","18555555559") }; List<Person> friend_List; friend_List = new ArrayList<Person>(); for(int i=0;i<DB.length;i++) { friend_List.add(DB[i]); }
1、首先,你需要在xml中加入一個(gè)listview控件:
<ListView android:id="@+id/data_view" android:layout_width="match_parent" android:layout_height="wrap_content" > </ListView>
2、接著你需要?jiǎng)?chuàng)建一個(gè)適配器MyAdapter類,這個(gè)適配器的作用時(shí)將你要展示的數(shù)據(jù)轉(zhuǎn)成可見格式也就時(shí)View。
class MyAdapter extends BaseAdapter { @Override public int getCount() { //返回表的長度 // TODO Auto-generated method stub return friend_List.size(); } @Override public Object getItem(int position) { //返回表的index位置的元組 // TODO Auto-generated method stub return friend_List.get(position); } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { //就像等到一個(gè)對象數(shù)組的某一個(gè)元素 // TODO Auto-generated method stub View view = View.inflate(MainActivity.this, R.layout.item, null); TextView tv_item_name = (TextView) view.findViewById(R.id.tv_item_name); TextView tv_item_tel = (TextView) view.findViewById(R.id.tv_item_tel); tv_item_name.setText(friend_List.get(position).getName()); tv_item_tel.setText(friend_List.get(position).getTel()); return view; //初始化這個(gè)listview會調(diào)用到這個(gè)方法,因?yàn)橐褌鬟M(jìn)去的對象數(shù)組的每個(gè)元素轉(zhuǎn)成view加入到listview中 } }
3、然后要在xml中寫下你要轉(zhuǎn)成的view的模板
<?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/tv_item_name" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:textSize="20sp" /> <TextView android:id="@+id/tv_item_tel" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:textSize="20sp" /> </LinearLayout>
4、最后在MainActivity中把listview的適配器設(shè)置一下。調(diào)用setAdapter這個(gè)方法
data_view.setAdapter(myAdapter);
Android代碼:
xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" > <TextView android:id="@+id/tv1" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="姓名" android:textSize="20sp" /> <TextView android:id="@+id/tv2" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="聯(lián)系電話" android:textSize="20sp" /> </LinearLayout> <ListView android:id="@+id/data_view" android:layout_width="match_parent" android:layout_height="wrap_content" > </ListView> </LinearLayout>
MainActivity:
package cn.zhuangzhihuang.mylist; import java.util.ArrayList; import java.util.List; import android.app.Activity; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.BaseAdapter; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends Activity { List<Person> friend_List; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ListView data_view = (ListView) findViewById(R.id.data_view); Person[] DB = { new Person("張三","18555555555"), new Person("李四","18555555556"), new Person("王五","18555555557"), new Person("趙六","18555555558"), new Person("鄧七","18555555559") }; friend_List = new ArrayList<Person>(); for(int i=0;i<DB.length;i++) { friend_List.add(DB[i]); } //自定義適配器 MyAdapter myAdapter = new MyAdapter(); data_view.setAdapter(myAdapter); data_view.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { // TODO Auto-generated method stub String temp = friend_List.get((int)id).toString(); Toast.makeText(MainActivity.this, temp, 0).show(); } }); } class MyAdapter extends BaseAdapter { @Override public int getCount() { //返回表的長度 // TODO Auto-generated method stub return friend_List.size(); } @Override public Object getItem(int position) { //返回表的index位置的元組 // TODO Auto-generated method stub return friend_List.get(position); } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { //就像等到一個(gè)對象數(shù)組的某一個(gè)元素 // TODO Auto-generated method stub View view = View.inflate(MainActivity.this, R.layout.item, null); TextView tv_item_name = (TextView) view.findViewById(R.id.tv_item_name); TextView tv_item_tel = (TextView) view.findViewById(R.id.tv_item_tel); tv_item_name.setText(friend_List.get(position).getName()); tv_item_tel.setText(friend_List.get(position).getTel()); return view; //初始化這個(gè)listview會調(diào)用到這個(gè)方法,因?yàn)橐褌鬟M(jìn)去的對象數(shù)組的每個(gè)元素轉(zhuǎn)成view加入到listview中 } } }
效果:
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