Hello Views Auto Complete (yaozq translation, for reference only)

To implement a text input box with an automatic completion prompt, you can use the AutoCompleteTextView component (widget ). The string set used for prompting in the component is implemented through ArrayAdapter.

In this tutorial, you will create an AutoCompleteTextView that provides prompts for country names. The procedure is as follows:

1. Create a new project named HelloAutoComplete.

2. Create an XML file named list_item.xml, save it in the res/layout directory, and edit it as follows:

<?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:padding="10dp"    android:textSize="16sp"    android:textColor="#000"></TextView>

This file defines a simple TextView for each item in the suggestions list.

3. open the file res/layout/main. xml and insert the following content:

<?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="wrap_content"    android:padding="5dp">    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Country" />    <AutoCompleteTextView android:id="@+id/autocomplete_country"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:layout_marginLeft="5dp"/></LinearLayout>

The TextVIew in the file is the label of the AutoCompleteTextView component.

4. Open the HelloAutoComplete. java file and insert the following code in onCreate:

@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.main);    AutoCompleteTextView textView = (AutoCompleteTextView) findViewById(R.id.autocomplete_country);    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.list_item, COUNTRIES);    textView.setAdapter(adapter);}

In the Code, set main. xml to content view, and use the findViewById (int) method to obtain the AutoCompleteTextView component. Then a new ArrayAdapter is initialized to bind the list_item.xml layout file to each item in the COUNTRIES character array. Finally, call setAdapter () to associate ArrayAdapter with the AutoCompleteTextView component, so that the characters in the string array will exist in the suggestions list.

5. Add a character array to the HelloAutoComplete class:

static final String[] COUNTRIES = 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"};

When you type AutoCompleteTextView, the content in the drop-down suggestions list is provided by the preceding string array.

6. Run this program and the following results will appear:

More information

Note that using a hard-coded string array is not a recommended encoding method, because your program code should focus on behavior instead of content. Application content such as strings should not be embodied in the Code. The advantage of doing so is that it is easier to modify and locate content. Hard-coded in the tutorial focuses on the autocompletetextview widget for convenience and convenience. Your program should declare such a strings array in the XML file. In the Res/vlues/strings. xml file of your project, you can use <string-array>. For example:

<?xml version="1.0" encoding="utf-8"?><resources>    <string-array name="countries_array">        <item>Bahrain</item>        <item>Bangladesh</item>        <item>Barbados</item>        <item>Belarus</item>        <item>Belgium</item>        <item>Belize</item>        <item>Benin</item>    </string-array></resources>

To use these string resources in arrayadapter, you can use the following method to replace the original arrayadapter constructor:

String[] countries = getResources().getStringArray(R.array.countries_array);ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.list_item, countries);