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Android開發之列表控件

一、基礎知識:

ListView是一個經常用到的控件,ListView裡面的每個子項Item可以使一個字符串,也可以是一個組合控件。先說說ListView的實現:

1.准備ListView要顯示的數據;

2.使用一維或多維動態數組保存數據;

3.構建適配器,簡單地來說,適配器就是Item數組,動態數組有多少元素就生成多少個Item;

4.把適配器添加到ListView,並顯示出來。

  

二、代碼展示:

1."Activity_10srcyanactivity_10MainActivity.java"

[java]

package yan.activity_10; 

 

import java.util.ArrayList; 

import java.util.HashMap; 

 

import android.os.Bundle; 

import android.view.View; 

import android.widget.ListView; 

import android.widget.SimpleAdapter; 

import android.app.ListActivity; 

 

public class MainActivity extends ListActivity { 

    private final String raw_user_name = "user_name"; 

    private final String raw_user_id = "user_id"; 

    private final String raw_user_ip = "user_ip"; 

     

    private String user_name_array[]={"zhangsan","lisi","wangwu"}; 

    private String user_ip_array[]={ 

            "192.168.1.115", 

            "192.168.1.116", 

            "192.168.1.117"}; 

     

    @Override 

    protected void onCreate(Bundle savedInstanceState) { 

        super.onCreate(savedInstanceState); 

        setContentView(R.layout.main); 

         

        // 生成動態數組,並且傳入數據  

        ArrayList <HashMap<String,String>> mylistArray = new ArrayList <HashMap<String,String>>(); 

         

        for(int i=0; i<30; ++i) 

        { 

            HashMap<String,String> map = new HashMap<String,String>(); 

            System.out.println("HAH : " + i%3); 

            map.put(raw_user_name, user_name_array[i%3]); 

            map.put(raw_user_id, i+1+""); 

            map.put(raw_user_ip, user_ip_array[i%3]); 

            mylistArray.add(map); 

        } 

         

        //生成適配器,數組-->>ListItem  

        SimpleAdapter mSchedule = new SimpleAdapter( 

                this, 

                mylistArray,    //  數據來源  

                R.layout.my_listview,   // ListItem的XML實現  

                new String[] {raw_user_name,raw_user_id,raw_user_ip},   // 動態數組與ListItem對應的子項  

                new int[] {R.id.user_name,R.id.user_id,R.id.user_ip}    // ListItem的XML文件裡面的兩個TextView ID  

                ); 

        setListAdapter(mSchedule); 

    } 

 

    @Override 

    protected void onListItemClick(ListView l, View v, int position, long id) { 

        // TODO Auto-generated method stub  

        super.onListItemClick(l, v, position, id); 

        System.out.println("id ---------------- " + id); 

        System.out.println("position ---------------- " + position); 

    } 

       

package yan.activity_10;

import java.util.ArrayList;

import java.util.HashMap;

import android.os.Bundle;

import android.view.View;

import android.widget.ListView;

import android.widget.SimpleAdapter;

import android.app.ListActivity;

public class MainActivity extends ListActivity {

 private final String raw_user_name = "user_name";

 private final String raw_user_id = "user_id";

 private final String raw_user_ip = "user_ip";

 

 private String user_name_array[]={"zhangsan","lisi","wangwu"};

 private String user_ip_array[]={

   "192.168.1.115",

   "192.168.1.116",

   "192.168.1.117"};

 

 @Override

 protected void onCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);

  setContentView(R.layout.main);

  

  // 生成動態數組,並且傳入數據

  ArrayList <HashMap<String,String>> mylistArray = new ArrayList <HashMap<String,String>>();

  

  for(int i=0; i<30; ++i)

  {

   HashMap<String,String> map = new HashMap<String,String>();

   System.out.println("HAH : " + i%3);

   map.put(raw_user_name, user_name_array[i%3]);

   map.put(raw_user_id, i+1+"");

   map.put(raw_user_ip, user_ip_array[i%3]);

   mylistArray.add(map);

  }

  

  //生成適配器,數組-->>ListItem

  SimpleAdapter mSchedule = new SimpleAdapter(

    this,

    mylistArray, // 數據來源

    R.layout.my_listview, // ListItem的XML實現

    new String[] {raw_user_name,raw_user_id,raw_user_ip}, // 動態數組與ListItem對應的子項

    new int[] {R.id.user_name,R.id.user_id,R.id.user_ip} // ListItem的XML文件裡面的兩個TextView ID

    

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