我正在学习android编程，我能够创建自定义ListView 用：
public class project1 extends ListActivity
{
....
}
使用自定义布局的xml文件。 我想知道如何用
做同样的事情public class project1 extends Activity
{
....
}
我查看的所有教程都使用extends ListActivity，我知道它的用途
让事情变得简单，但为了学习如何做到这一点很难？
答案 0 :(得分：5)
看一下本教程。 http://techdroid.kbeanie.com/2009/07/custom-listview-for-android.html
通过这篇文章。它提升了一些：Lazy load of images in ListView
根据您的评论编辑：
考虑显示国家/地区列表及其缩写名称的示例
首先，对于Custom ListView，您必须创建一个表示列表视图的xml文件：
<?xml version="1.0" encoding="utf-8"?>
<!--main.xml-->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#ffccd0"
>
<TextView
android:text="Countries List"
android:textColor="#b3000d"
android:gravity="center_vertical|center_horizontal"
android:textSize="26dip"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textStyle="bold"
android:background="#ffb0b6"
android:layout_marginBottom="5dip"
android:typeface="sans"/>
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#570000">
<TextView android:id="@+id/tv_1"
android:textColor="#FFFFFF"
android:gravity="center_vertical|left"
android:textSize="16dip"
android:layout_height="wrap_content"
android:textStyle="bold"
android:typeface="serif"
android:layout_width="70dip"
android:paddingLeft="20dip"
android:text="Abbr">
</TextView>
<TextView android:id="@+id/tv_2"
android:textColor="#FFFFFF"
android:gravity="center_vertical|left"
android:textSize="16dip"
android:layout_height="wrap_content"
android:textStyle="bold"
android:typeface="serif"
android:layout_width="200dip"
android:layout_toRightOf="@+id/tv_1"
android:text="Countries">
</TextView>
</RelativeLayout>
<ListView
android:id="@+id/lv_country"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:cacheColorHint="#00000000">
</ListView>
</LinearLayout>
现在您必须创建一个表示一行列表项的xml文件。 这是我的row.xml文件：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="wrap_content"
android:gravity="left|center"
android:layout_width="wrap_content"
android:paddingBottom="10px"
android:paddingTop="10px"
android:paddingLeft="3px">
<TextView
android:id="@+id/TextView01"
android:layout_width="70dip"
android:scrollHorizontally="true"
android:layout_height="wrap_content"
android:gravity="left"
android:layout_weight="1"
android:singleLine="true"
android:textSize="15dip"
android:textStyle="bold"
android:textColor="#d08021"
android:paddingLeft="20dip">
</TextView>
<TextView
android:id="@+id/TextView02"
android:layout_weight="2"
android:layout_width="200dip"
android:scrollHorizontally="true"
android:layout_height="wrap_content"
android:gravity="left"
android:singleLine="true"
android:layout_marginLeft="10dip"
android:textSize="15dip"
android:textStyle="bold"
android:textColor="#7f0000">
</TextView>
</LinearLayout>
由于你想在ListView中显示字符串数组，我使用了静态字符串数组并存储在CountriesList.java文件中。
这是我的CountriesList.java文件：
public class CountriesList {
public static String[] countries = { "Afghanistan", "Albania Albania Albania AlbaniaAlbaniaAlbaniaAlbania Albania ", "Algeria",
"American Samoa", "Andorra", "Angola", "Anguilla", "Antarctica",
"Antigua and Barbuda", "Argentina", "Armenia", "Aruba",
"Australia", "Austria", "Azerbaijan", "Bahamas", "Bahrain",
"Bangladesh", "Barbados", "Belarus", "Belgium", "Belize", "Benin",
"Bermuda", "Bhutan", "Bolivia", "Bosnia and Herzegovina",
"Botswana", "Bouvet Island", "Brazil",
"British Indian Ocean Territory", "Brunei Darussalam", "Bulgaria",
"Burkina Faso", "Burundi", "Cambodia", "Cameroon", "Canada",
"Cape Verde", "Cayman Islands", "Central African Republic", "Chad",
"Chile", "China", "Christmas Island", "Cocos (Keeling) Islands",
"Colombia", "Comoros", "Congo",
"Congo, the Democratic Republic of the", "Cook Islands",
"Costa Rica", "Cote D'Ivoire", "Croatia", "Cuba", "Cyprus",
"Czech Republic", "Denmark", "Djibouti", "Dominica",
"Dominican Republic", "Ecuador", "Egypt", "El Salvador",
"Equatorial Guinea", "Eritrea", "Estonia", "Ethiopia",
"Falkland Islands (Malvinas)", "Faroe Islands", "Fiji", "Finland",
"France", "French Guiana", "French Polynesia",
"French Southern Territories", "Gabon", "Gambia", "Georgia",
"Germany", "Ghana", "Gibraltar", "Greece", "Greenland", "Grenada",
"Guadeloupe", "Guam", "Guatemala", "Guinea", "Guinea-Bissau",
"Guyana", "Haiti", "Heard Island and Mcdonald Islands",
"Holy See (Vatican City State)", "Honduras", "Hong Kong",
"Hungary", "Iceland", "India", "Indonesia",
"Iran, Islamic Republic of", "Iraq", "Ireland", "Israel", "Italy",
"Jamaica", "Japan", "Jordan", "Kazakhstan", "Kenya", "Kiribati",
"Korea, Democratic People's Republic of", "Korea, Republic of",
"Kuwait", "Kyrgyzstan", "Lao People's Democratic Republic",
"Latvia", "Lebanon", "Lesotho", "Liberia",
"Libyan Arab Jamahiriya", "Liechtenstein", "Lithuania",
"Luxembourg", "Macao",
"Macedonia, the Former Yugoslav Republic of", "Madagascar",
"Malawi", "Malaysia", "Maldives", "Mali", "Malta",
"Marshall Islands", "Martinique", "Mauritania", "Mauritius",
"Mayotte", "Mexico", "Micronesia, Federated States of",
"Moldova, Republic of", "Monaco", "Mongolia", "Montserrat",
"Morocco", "Mozambique", "Myanmar", "Namibia", "Nauru", "Nepal",
"Netherlands", "Netherlands Antilles", "New Caledonia",
"New Zealand", "Nicaragua", "Niger", "Nigeria", "Niue",
"Norfolk Island", "Northern Mariana Islands", "Norway", "Oman",
"Pakistan", "Palau", "Palestinian Territory, Occupied", "Panama",
"Papua New Guinea", "Paraguay", "Peru", "Philippines", "Pitcairn",
"Poland", "Portugal", "Puerto Rico", "Qatar", "Reunion", "Romania",
"Russian Federation", "Rwanda", "Saint Helena",
"Saint Kitts and Nevis", "Saint Lucia",
"Saint Pierre and Miquelon", "Saint Vincent and the Grenadines",
"Samoa", "San Marino", "Sao Tome and Principe", "Saudi Arabia",
"Senegal", "Serbia and Montenegro", "Seychelles", "Sierra Leone",
"Singapore", "Slovakia", "Slovenia", "Solomon Islands", "Somalia",
"South Africa", "South Georgia and the South Sandwich Islands",
"Spain", "Sri Lanka", "Sudan", "Suriname",
"Svalbard and Jan Mayen", "Swaziland", "Sweden", "Switzerland",
"Syrian Arab Republic", "Taiwan, Province of China", "Tajikistan",
"Tanzania, United Republic of", "Thailand", "Timor-Leste", "Togo",
"Tokelau", "Tonga", "Trinidad and Tobago", "Tunisia", "Turkey",
"Turkmenistan", "Turks and Caicos Islands", "Tuvalu", "Uganda",
"Ukraine", "United Arab Emirates", "United Kingdom",
"United States", "United States Minor Outlying Islands", "Uruguay",
"Uzbekistan", "Vanuatu", "Venezuela", "Viet Nam",
"Virgin Islands, British", "Virgin Islands, U.s.",
"Wallis and Futuna", "Western Sahara", "Yemen", "Zambia",
"Zimbabwe" };
public static String[] abbreviations = { "AF Western Sahara Western SaharaWestern Sahara Western SaharaWestern Sahara", "AL", "DZ", "AS", "AD", "AO", "AI", "AQ",
"AG", "AR", "AM", "AW", "AU", "AT", "AZ", "BS", "BH", "BD", "BB",
"BY", "BE", "BZ", "BJ", "BM", "BT", "BO", "BA", "BW", "BV", "BR",
"IO", "BN", "BG", "BF", "BI", "KH", "CM", "CA", "CV", "KY", "CF",
"TD", "CL", "CN", "CX", "CC", "CO", "KM", "CG", "CD", "CK", "CR",
"CI", "HR", "CU", "CY", "CZ", "DK", "DJ", "DM", "DO", "EC", "EG",
"SV", "GQ", "ER", "EE", "ET", "FK", "FO", "FJ", "FI", "FR", "GF",
"PF", "TF", "GA", "GM", "GE", "DE", "GH", "GI", "GR", "GL", "GD",
"GP", "GU", "GT", "GN", "GW", "GY", "HT", "HM", "VA", "HN", "HK",
"HU", "IS", "IN", "ID", "IR", "IQ", "IE", "IL", "IT", "JM", "JP",
"JO", "KZ", "KE", "KI", "KP", "KR", "KW", "KG", "LA", "LV", "LB",
"LS", "LR", "LY", "LI", "LT", "LU", "MO", "MK", "MG", "MW", "MY",
"MV", "ML", "MT", "MH", "MQ", "MR", "MU", "YT", "MX", "FM", "MD",
"MC", "MN", "MS", "MA", "MZ", "MM", "NA", "NR", "NP", "NL", "AN",
"NC", "NZ", "NI", "NE", "NG", "NU", "NF", "MP", "NO", "OM", "PK",
"PW", "PS", "PA", "PG", "PY", "PE", "PH", "PN", "PL", "PT", "PR",
"QA", "RE", "RO", "RU", "RW", "SH", "KN", "LC", "PM", "VC", "WS",
"SM", "ST", "SA", "SN", "CS", "SC", "SL", "SG", "SK", "SI", "SB",
"SO", "ZA", "GS", "ES", "LK", "SD", "SR", "SJ", "SZ", "SE", "CH",
"SY", "TW", "TJ", "TZ", "TH", "TL", "TG", "TK", "TO", "TT", "TN",
"TR", "TM", "TC", "TV", "UG", "UA", "AE", "GB", "US", "UM", "UY",
"UZ", "VU", "VE", "VN", "VG", "VI", "WF", "EH", "YE", "ZM", "ZW" };
}
在自定义ListView时，您创建了另一个扩展BaseAdapter的类，作为ListView的控制器。
所以这是我的EfficientAdapter.java文件：
private static class EfficientAdapter extends BaseAdapter {
private LayoutInflater mInflater;
public EfficientAdapter(Context context) {
mInflater = LayoutInflater.from(context);
}
public int getCount() {
return CountriesList.abbreviations.length;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.row, null);
holder = new ViewHolder();
holder.text1 = (TextView) convertView
.findViewById(R.id.TextView01);
holder.text2 = (TextView) convertView
.findViewById(R.id.TextView02);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.text1.setText(CountriesList.abbreviations[position]);
holder.text2.setText(CountriesList.countries[position]);
return convertView;
}
static class ViewHolder {
TextView text1;
TextView text2;
}
}
现在剩下的最后一件事就是你的活动类。 这是：
public class MyList extends Activity {
/** Called when the activity is first created. */
ListView listView;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
listView = (ListView) findViewById(R.id.lv_country);
listView.setAdapter(new EfficientAdapter(this));
listView.setOnItemClickListener(
new OnItemClickListener()
{
@Override
public void onItemClick(AdapterView<?> arg0, View view,int position, long arg3) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(),"You Selected Item "+Integer.toString(position), Toast.LENGTH_LONG).show();
}
}
);
}
答案 1 :(得分：2)
扩展Activity时，实际上并不困难。
唯一改变的是您首先必须使用ListView方法获取对XML布局文件中定义的findViewById()的引用。
ListView mListView = (ListView)findViewById(R.id.my_listview);
定义自定义Adapter的工作方式相同。只需创建它并分配ListView该适配器。
mListView.setAdapter(mAdapter);
多数民众赞成。没什么特别的。
答案 2 :(得分：-2)
public class ListViewLoader extends ListActivity
implements LoaderManager.LoaderCallbacks<Cursor> {
// This is the Adapter being used to display the list's data
SimpleCursorAdapter mAdapter;
// These are the Contacts rows that we will retrieve
static final String[] PROJECTION = new String[] {ContactsContract.Data._ID,
ContactsContract.Data.DISPLAY_NAME};
// This is the select criteria
static final String SELECTION = "((" +
ContactsContract.Data.DISPLAY_NAME + " NOTNULL) AND (" +
ContactsContract.Data.DISPLAY_NAME + " != '' ))";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Create a progress bar to display while the list loads
ProgressBar progressBar = new ProgressBar(this);
progressBar.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT, Gravity.CENTER));
progressBar.setIndeterminate(true);
getListView().setEmptyView(progressBar);
// Must add the progress bar to the root of the layout
ViewGroup root = (ViewGroup) findViewById(android.R.id.content);
root.addView(progressBar);
// For the cursor adapter, specify which columns go into which views
String[] fromColumns = {ContactsContract.Data.DISPLAY_NAME};
int[] toViews = {android.R.id.text1}; // The TextView in simple_list_item_1
// Create an empty adapter we will use to display the loaded data.
// We pass null for the cursor, then update it in onLoadFinished()
mAdapter = new SimpleCursorAdapter(this,
android.R.layout.simple_list_item_1, null,
fromColumns, toViews, 0);
setListAdapter(mAdapter);
// Prepare the loader. Either re-connect with an existing one,
// or start a new one.
getLoaderManager().initLoader(0, null, this);
}
// Called when a new Loader needs to be created
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
// Now create and return a CursorLoader that will take care of
// creating a Cursor for the data being displayed.
return new CursorLoader(this, ContactsContract.Data.CONTENT_URI,
PROJECTION, SELECTION, null, null);
}
// Called when a previously created loader has finished loading
public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
// Swap the new cursor in. (The framework will take care of closing the
// old cursor once we return.)
mAdapter.swapCursor(data);
}
// Called when a previously created loader is reset, making the data unavailable
public void onLoaderReset(Loader<Cursor> loader) {
// This is called when the last Cursor provided to onLoadFinished()
// above is about to be closed. We need to make sure we are no
// longer using it.
mAdapter.swapCursor(null);
}
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
// Do something when a list item is clicked
}
}