android应用开发揭秘例4-4笔记(ListView及Adapter的使用)

package com.yarin.android.Examples_04_04;

import android.app.Activity;
import android.database.Cursor;
import android.graphics.Color;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.provider.ContactsContract.PhoneLookup;
import android.view.View;
import android.widget.AdapterView;
import android.widget.LinearLayout;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.widget.Toast;

public class Activity01 extends Activity
{
LinearLayout m_LinearLayout;
ListView m_ListView;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);

/* 创建LinearLayout布局对象 */
m_LinearLayout = new LinearLayout(this);
/* 设置布局LinearLayout的属性 */
m_LinearLayout.setOrientation(LinearLayout.VERTICAL);
m_LinearLayout.setBackgroundColor(android.graphics.Color.BLACK);

/* 创建ListView对象 */
m_ListView = new ListView(this);
LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
m_ListView.setBackgroundColor(Color.BLACK);

/* 添加m_ListView到m_LinearLayout布局 */
m_LinearLayout.addView(m_ListView, param);

/* 设置显示m_LinearLayout布局 */
setContentView(m_LinearLayout);

// 获取数据库Phones的Cursor
Cursor cur = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null);
startManagingCursor(cur);

// ListAdapter是ListView和后台数据的桥梁
ListAdapter adapter = new SimpleCursorAdapter(this,
// 定义List中每一行的显示模板
// 表示每一行包含两个数据项
android.R.layout.simple_list_item_2,
// 数据库的Cursor对象
cur,
// 从数据库的NAME和NUMBER两列中取数据
new String[] {PhoneLookup.DISPLAY_NAME, ContactsContract.CommonDataKinds.Phone.NUMBER},
// 与NAME和NUMBER对应的Views
new int[] { android.R.id.text1, android.R.id.text2 });

/* 将adapter添加到m_ListView中 */
m_ListView.setAdapter(adapter);

/* 为m_ListView视图添加setOnItemSelectedListener监听 */
m_ListView.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3)
{

DisplayToast("滚动到第"+Long.toString(arg2+1)+"项");
}

@Override
public void onNothingSelected(AdapterView<?> arg0)
{
//没有选中
}
});

/* 为m_ListView视图添加setOnItemClickListener监听 */
m_ListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3)
{
//于对选中的项进行处理
DisplayToast("选中了第"+Integer.toString(arg2+1)+"项");
}

});

}
/* 显示Toast */
public void DisplayToast(String str)
{
Toast.makeText(this, str, Toast.LENGTH_SHORT).show();
}
}