ID #58980

ListView 控件常规用法

ListView是比较常用的控件,但一直都觉得创建ListView步骤有点繁琐,故在此总结一下,方便查阅。

  程序效果是实现一个ListView,ListView里面有标题,内容和图片,并加入点击和长按响应。

(图)ListView 控件常规用法ListView 控件常规用法

  

 

 

(图)ListView 控件常规用法ListView 控件常规用法

 

 

首先在xml里面定义一个ListView

  < ?xml version="1.0" encoding="utf-8"?>

  < LinearLayout

  Android:id="@+id/LinearLayout01"

  android:layout_width="fill_parent"

  android:layout_height="fill_parent"

  xmlns:android="http://schemas.android.com/apk/res/android">

  < ListView android:layout_width="wrap_content"

  android:layout_height="wrap_content"

  android:id="@+id/ListView01"

  />

  < /LinearLayout>

  定义ListView每个条目的Layout,用RelativeLayout实现:

  < ?xml version="1.0" encoding="utf-8"?>

  < RelativeLayout

  android:id="@+id/RelativeLayout01"

  android:layout_width="fill_parent"

  xmlns:android="http://schemas.android.com/apk/res/android"

  android:layout_height="wrap_content"

  android:paddingBottom="4dip"

  android:paddingLeft="12dip"

  android:paddingRight="12dip">

  < ImageView

  android:paddingTop="12dip"

  android:layout_alignParentRight="true"

  android:layout_width="wrap_content"

  android:layout_height="wrap_content"

  android:id="@+id/ItemImage"

  />

  < TextView

  android:text="TextView01"

  android:layout_height="wrap_content"

  android:textSize="20dip"

  android:layout_width="fill_parent"

  android:id="@+id/ItemTitle"

  />

      < TextView

  android:text="TextView02"

  android:layout_height="wrap_content"

  android:layout_width="fill_parent"

  android:layout_below="@+id/ItemTitle"

  android:id="@+id/ItemText"

  />

  < /RelativeLayout>

  最后在Activity里面调用和加入Listener,具体见注释:

  package com.ray.test;

  import Java.util.ArrayList;

  import java.util.HashMap;

  import android.app.Activity;

  import android.os.Bundle;

  import android.view.ContextMenu;

  import android.view.MenuItem;

  import android.view.View;

  import android.view.ContextMenu.ContextMenuInfo;

  import android.view.View.OnCreateContextMenuListener;

  import android.widget.AdapterView;

  import android.widget.ListView;

  import android.widget.SimpleAdapter;

  import android.widget.AdapterView.OnItemClickListener;

  public class TestListView extends Activity {

  @Override

  public void onCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);

  setContentView(R.layout.main);

  //绑定Layout里面的ListView

  ListView list = (ListView) findViewById(R.id.ListView01);

  //生成动态数组,加入数据

  ArrayList< HashMap< String, Object>> listItem = new ArrayList< HashMap< String, Object>>();

  for(int i=0;i< 10;i++)

  {

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

  map.put("ItemImage", R.drawable.checked);//图像资源的ID

  map.put("ItemTitle", "Level "+i);

  map.put("ItemText", "Finished in 1 Min 54 Secs, 70 Moves! ");

  listItem.add(map);

  }

  //生成适配器的Item和动态数组对应的元素

  SimpleAdapter listItemAdapter = new SimpleAdapter(this,listItem,//数据源

      R.layout.list_items,//ListItem的XML实现

  //动态数组与ImageItem对应的子项

  new String[] {"ItemImage","ItemTitle", "ItemText"},

  //ImageItem的XML文件里面的一个ImageView,两个TextView ID

  new int[] {R.id.ItemImage,R.id.ItemTitle,R.id.ItemText}

  );

  //添加并且显示

  list.setAdapter(listItemAdapter);

  //添加点击

  list.setOnItemClickListener(new OnItemClickListener() {

  @Override

  public void onItemClick(AdapterView< ?> arg0, View arg1, int arg2,

  long arg3) {

  setTitle("点击第"+arg2+"个项目");

  }

  });

  //添加长按点击

  list.setOnCreateContextMenuListener(new OnCreateContextMenuListener() {

  @Override

  public void onCreateContextMenu(ContextMenu menu, View v,ContextMenuInfo menuInfo) {

  menu.setHeaderTitle("长按菜单-ContextMenu");

  menu.add(0, 0, 0, "弹出长按菜单0");

  menu.add(0, 1, 0, "弹出长按菜单1");

  }

  });

  }

  //长按菜单响应函数

  @Override

  public boolean onContextItemSelected(MenuItem item) {

  setTitle("点击了长按菜单里面的第"+item.getItemId()+"个项目");

  return super.onContextItemSelected(item);

  }

  }