Android ListView列表视图的使用方法

前言

当你要将某个从数据库或者文件中获得相当大的数据,在界面中向用户展示的时候,由于定义一个个视图比较麻烦,Android中提供了类似于数组的控件–ListView。

使用方法:

假设我们要转的数据是一个Person对象数组

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 "点击的联系人为" + this.getName() +"\n电话号码为" + this.getTel();

}

}

Person[] DB = {

new Person("张三","18555555555"),

new Person("李四","18555555556"),

new Person("王五","18555555557"),

new Person("赵六","18555555558"),

new Person("邓七","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中加入一个listview控件:

<ListView

android:id="@+id/data_view"

android:layout_width="match_parent"

android:layout_height="wrap_content" >

</ListView>

2、接着你需要创建一个适配器MyAdapter类,这个适配器的作用时将你要展示的数据转成可见格式也就时View。

class MyAdapter extends BaseAdapter {

@Override

public int getCount() { //返回表的长度

// TODO Auto-generated method stub

return friend_List.size();

}

@Override

public Object getItem(int position) { //返回表的index位置的元组

// 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) { //就像等到一个对象数组的某一个元素

// 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;

//初始化这个listview会调用到这个方法,因为要把传进去的对象数组的每个元素转成view加入到listview中

}

}

3、然后要在xml中写下你要转成的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的适配器设置一下。调用setAdapter这个方法

data_view.setAdapter(myAdapter);

Android代码:

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="联系电话"

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("张三","18555555555"),

new Person("李四","18555555556"),

new Person("王五","18555555557"),

new Person("赵六","18555555558"),

new Person("邓七","18555555559")

};

friend_List = new ArrayList<Person>();

for(int i=0;i<DB.length;i++) {

friend_List.add(DB[i]);

}

//自定义适配器

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() { //返回表的长度

// TODO Auto-generated method stub

return friend_List.size();

}

@Override

public Object getItem(int position) { //返回表的index位置的元组

// 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) { //就像等到一个对象数组的某一个元素

// 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;

//初始化这个listview会调用到这个方法,因为要把传进去的对象数组的每个元素转成view加入到listview中

}

}

}

效果:

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。

以上是 Android ListView列表视图的使用方法 的全部内容, 来源链接: utcz.com/p/241567.html

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