Android学习之AutoCompleteTextView控件的学习

使用AutoCompleteTextView控件最关键的地方还是用ArrayAdapter适配器给他提供内容。

本例有两个xml布局文件：一个是main.xml文件，里面有TextView和AutoCompleteTextView控件

main.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:Android="http://schemas.android.com/apk/res/android"
 android:orientation="horizontal"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent">
 <TextView
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:text="请输入"
  />

 <AutoCompleteTextView
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:id="@+id/actv"
  android:layout_marginLeft="5dp"
  />
</LinearLayout>

还有一个list_item.xml文件，里面是用来约束ArrayAdapter数据输入的格式，里面就一个TextView：

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:id="@+id/textView"
    >
</TextView>

java代码：

import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.TextView;

public class AutoCompleteTextViewActivity extends Activity {
 private AutoCompleteTextView actv = null;
 private TextView textView = null;

 static final String[] str = new String[] {
 "Afghanistan", "Albania", "Algeria", "American Samoa", "Andorra", "Angola",
   "Anguilla", "Antarctica", "Antigua and Barbuda", "Argentina",
   "Armenia", "Aruba", "Australia", "Austria", "Azerbaijan",
   "Bahrain", "Bangladesh", "Barbados", "Belarus", "Belgium",
   "Belize", "Benin", "Bermuda", "Bhutan", "Bolivia",
   "Bosnia and Herzegovina", "Botswana", "Bouvet Island", "Brazil",
   "British Indian Ocean Territory", "British Virgin Islands",
   "Brunei", "Bulgaria", "Burkina Faso", "Burundi", "Cote d'Ivoire",
   "Cambodia", "Cameroon", "Canada", "Cape Verde", "Cayman Islands",
   "Central African Republic", "Chad", "Chile", "China",
   "Christmas Island", "Cocos (Keeling) Islands", "Colombia",
   "Comoros", "Congo", "Cook Islands", "Costa Rica", "Croatia",
   "Cuba", "Cyprus", "Czech Republic",
   "Democratic Republic of the Congo", "Denmark", "Djibouti",
   "Dominica", "Dominican Republic", "East Timor", "Ecuador", "Egypt",
   "El Salvador", "Equatorial Guinea", "Eritrea", "Estonia",
   "Ethiopia", "Faeroe Islands", "Falkland Islands", "Fiji",
   "Finland", "Former Yugoslav Republic of Macedonia", "France",
   "French Guiana", "French Polynesia", "French Southern Territories",
   "Gabon", "Georgia", "Germany", "Ghana", "Gibraltar", "Greece",
   "Greenland", "Grenada", "Guadeloupe", "Guam", "Guatemala",
   "Guinea", "Guinea-Bissau", "Guyana", "Haiti",
   "Heard Island and McDonald Islands", "Honduras", "Hong Kong",
   "Hungary", "Iceland", "India", "Indonesia", "Iran", "Iraq",
   "Ireland", "Israel", "Italy", "Jamaica", "Japan", "Jordan",
   "Kazakhstan", "Kenya", "Kiribati", "Kuwait", "Kyrgyzstan", "Laos",
   "Latvia", "Lebanon", "Lesotho", "Liberia", "Libya",
   "Liechtenstein", "Lithuania", "Luxembourg", "Macau", "Madagascar",
   "Malawi", "Malaysia", "Maldives", "Mali", "Malta",
   "Marshall Islands", "Martinique", "Mauritania", "Mauritius",
   "Mayotte", "Mexico", "Micronesia", "Moldova", "Monaco", "Mongolia",
   "Montserrat", "Morocco", "Mozambique", "Myanmar", "Namibia",
   "Nauru", "Nepal", "Netherlands", "Netherlands Antilles",
   "New Caledonia", "New Zealand", "Nicaragua", "Niger", "Nigeria",
   "Niue", "Norfolk Island", "North Korea", "Northern Marianas",
   "Norway", "Oman", "Pakistan", "Palau", "Panama",
   "Papua New Guinea", "Paraguay", "Peru", "Philippines",
   "Pitcairn Islands", "Poland", "Portugal", "Puerto Rico", "Qatar",
   "Reunion", "Romania", "Russia", "Rwanda", "Sqo Tome and Principe",
   "Saint Helena", "Saint Kitts and Nevis", "Saint Lucia",
   "Saint Pierre and Miquelon", "Saint Vincent and the Grenadines",
   "Samoa", "San Marino", "Saudi Arabia", "Senegal", "Seychelles",
   "Sierra Leone", "Singapore", "Slovakia", "Slovenia",
   "Solomon Islands", "Somalia", "South Africa",
   "South Georgia and the South Sandwich Islands", "South Korea",
   "Spain", "Sri Lanka", "Sudan", "Suriname",
   "Svalbard and Jan Mayen", "Swaziland", "Sweden", "Switzerland",
   "Syria", "Taiwan", "Tajikistan", "Tanzania", "Thailand",
   "The Bahamas", "The Gambia", "Togo", "Tokelau", "Tonga",
   "Trinidad and Tobago", "Tunisia", "Turkey", "Turkmenistan",
   "Turks and Caicos Islands", "Tuvalu", "Virgin Islands", "Uganda",
   "Ukraine", "United Arab Emirates", "United Kingdom",
   "United States", "United States Minor Outlying Islands", "Uruguay",
   "Uzbekistan", "Vanuatu", "Vatican City", "Venezuela", "Vietnam",
   "Wallis and Futuna", "Western Sahara", "Yemen", "Yugoslavia",
   "Zambia", "Zimbabwe"
 };

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  actv = (AutoCompleteTextView) findViewById(R.id.actv);
  textView = (TextView) findViewById(R.id.textView);

  /**
   * 调用ArrayAdapter的构造函数创建一个ArrayAdapter对象
   * 第一个参数指上下文
   * 第二个参数指定了下拉菜单中每一个条目的样式
   * 第三个参数指定了TextView控件的id
   * 第四个参数要添加数据的集合，为整个列表提供数据
   */
  ArrayAdapter<String> aa = new ArrayAdapter<String>(this, R.layout.list_item, R.id.textView, str);
  actv.setAdapter(aa);
 }
}