Dee*_*pak 3 android listview listactivity
我正在学习android编程,我能够创建一个自定义ListView:
public class project1 extends ListActivity
{
....
}
使用自定义布局的xml文件.我想知道如何做同样的事情但是
public class project1 extends Activity
{
....
}
我看过的所有教程都使用extends ListActivity,我知道它的目的是为了让事情更简单,但为了学习如何做到这一点很难？
看看这个教程.http://techdroid.kbeanie.com/2009/07/custom-listview-for-android.html
通过这篇文章.它是高级的:ListView中的图像延迟加载
编辑根据你的评论:
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listview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列表项行的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,您需要创建另一个扩展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是您的活动类.这里是 :
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();
}
}
);
}
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