自定義ListView

今天碰到ListView的問題，爲了加深記憶，就寫到博客中來。

一。新建一個關於ListView的佈局文件（list.xml）

<?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="vertical" >
   
    <ListView
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </ListView>
</LinearLayout>

二。新建一個關於ListView中Item的佈局文件（list_item.xml）

<?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="vertical" >
   
    <TextView android:id="@+id/name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textColor="#FF0000"

/>

    <TextView android:id="@+id/password"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
         android:textColor="#FF0000"

/>

</LinearLayout>

三。編寫一個實體類（User.java）

package com.youchuang.entity;

public class User {
 private String name;
 private String password;

 public String getName() {
  return name;
 }

 public void setName(String name) {
  this.name = name;
 }

 public String getPassword() {
  return password;
 }

 public void setPassword(String password) {
  this.password = password;
 }
}
 

四。編寫Activity（ListDemoActivity.java）

package com.youchuang.activity;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;

import com.youchuang.adapter.MyAdapter;
import com.youchuang.entity.User;

public class ListDemoActivity extends Activity {
 private ListView lv;
 private List<User> list;
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.list);
  
  lv = (ListView)findViewById(R.id.listView);
  list = getData();
  
  //適配器
  MyAdapter adapter = new MyAdapter(this, list);
  //爲ListView設置適配器
  lv.setAdapter(adapter);
 }
 
 //得到List_item中的數據
 private List<User> getData()
 {
  List<User> ls = new ArrayList<User>();
  
  User user1 = new User();
  user1.setName("jerry");
  user1.setPassword("jerry");
  ls.add(user1);
  
  User user2 = new User();
  user2.setName("tom");
  user2.setPassword("tom");
  ls.add(user2);
  
  User user3 = new User();
  user3.setName("jacker");
  user3.setPassword("jacker");
  ls.add(user3);
  
  return ls;
 }
 
}
五。編寫適配器類（MyAdapter.java）

package com.youchuang.adapter;

import java.util.List;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import com.youchuang.activity.R;
import com.youchuang.entity.User;

public class MyAdapter extends BaseAdapter {
 private LayoutInflater inflater;
 private List<User> list;

 public MyAdapter(Context context, List<User> list) {
  this.inflater = LayoutInflater.from(context);
  this.list = list;
 }

 public int getCount() {
  return list.size();
 }

 public Object getItem(int position) {
  return null;
 }

 public long getItemId(int position) {
  return 0;
 }

 static class ViewHolder {
  private TextView tv1;
  private TextView tv2;
 }

 public View getView(int position, View convertView, ViewGroup parent) {
  ViewHolder holder = null;
  if (convertView == null) {
   holder = new ViewHolder();
   //加載List_item的佈局文件
   convertView = inflater.inflate(R.layout.list_item, null);
   holder.tv1 = (TextView) convertView.findViewById(R.id.name);
   holder.tv2 = (TextView) convertView.findViewById(R.id.password);

   convertView.setTag(holder);
  } else {
   holder = (ViewHolder) convertView.getTag();
  }

   holder.tv1.setText(list.get(position).getName());
   holder.tv2.setText(list.get(position).getPassword());

  return convertView;
 }
}
 

六。