Hello, Views (List View編)

List View | Android Developers

http://developer.android.com/intl/ja/resources/tutorials/views/hello-listview.html 他の言語にもあるリストビューですね。
早速始めましょう。
HelloListViewというプロジェクトを作成します。
アクティビティ名はHelloListViewActivityとします。

XMLファイル list_item.xml をルート要素 TextView で作成し、をres/layoutに保存します。
res/layout/list_item.xmlを以下のように変更します。

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="10dp"
    android:textSize="16sp" >
</TextView>

HelloListViewActivity.javaを開き、ListActivityを継承させ、以下のように変更します。

package com.blogspot.logroid.helloListView;
 
import android.app.ListActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
 
public class HelloListViewActivity extends ListActivity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
 
        String[] countries = getResources().getStringArray(R.array.countries_array);
        setListAdapter(new ArrayAdapter<String>(this, R.layout.list_item, countries));
 
        ListView lv = getListView();
        lv.setTextFilterEnabled(true);
 
        lv.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                // When clicked, show a toast with the TextView text
                Toast.makeText(getApplicationContext(), ((TextView) view).getText(),
                        Toast.LENGTH_SHORT).show();
            }
        });
    }
}

res/valuesにXMLファイルを作成します。
リソースタイプは、Values、ファイルはarray.xmlとします。

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="countries_array">
        <item>Afghanistan</item>
        <item>Albania</item>
        <item>Algeria</item>
        <item>American Samoa</item>
        <item>Andorra</item>
        <item>Angola</item>
        <item>Anguilla</item>
        <item>Antarctica</item>
        <item>Antigua and Barbuda</item>
        <item>Argentina</item>
        <item>Armenia</item>
        <item>Aruba</item>
        <item>Australia</item>
        <item>Austria</item>
        <item>Azerbaijan</item>
        <item>Bahrain</item>
        <item>Bangladesh</item>
        <item>Barbados</item>
        <item>Belarus</item>
        <item>Belgium</item>
        <item>Belize</item>
        <item>Benin</item>
        <item>Bermuda</item>
        <item>Bhutan</item>
        <item>Bolivia</item>
        <item>Bosnia and Herzegovina</item>
        <item>Botswana</item>
        <item>Bouvet Island</item>
        <item>Brazil</item>
        <item>British Indian Ocean Territory</item>
        <item>British Virgin Islands</item>
        <item>Brunei</item>
        <item>Bulgaria</item>
        <item>Burkina Faso</item>
        <item>Burundi</item>
        <item>Cote d\'Ivoire</item>
        <item>Cambodia</item>
        <item>Cameroon</item>
        <item>Canada</item>
        <item>Cape Verde</item>
        <item>Cayman Islands</item>
        <item>Central African Republic</item>
        <item>Chad</item>
        <item>Chile</item>
        <item>China</item>
        <item>Christmas Island</item>
        <item>Cocos (Keeling) Islands</item>
        <item>Colombia</item>
        <item>Comoros</item>
        <item>Congo</item>
        <item>Cook Islands</item>
        <item>Costa Rica</item>
        <item>Croatia</item>
        <item>Cuba</item>
        <item>Cyprus</item>
        <item>Czech Republic</item>
        <item>Democratic Republic of the Congo</item>
        <item>Denmark</item>
        <item>Djibouti</item>
        <item>Dominica</item>
        <item>Dominican Republic</item>
        <item>East Timor</item>
        <item>Ecuador</item>
        <item>Egypt</item>
        <item>El Salvador</item>
        <item>Equatorial Guinea</item>
        <item>Eritrea</item>
        <item>Estonia</item>
        <item>Ethiopia</item>
        <item>Faeroe Islands</item>
        <item>Falkland Islands</item>
        <item>Fiji</item>
        <item>Finland</item>
        <item>Former Yugoslav Republic of Macedonia</item>
        <item>France</item>
        <item>French Guiana</item>
        <item>French Polynesia</item>
        <item>French Southern Territories</item>
        <item>Gabon</item>
        <item>Georgia</item>
        <item>Germany</item>
        <item>Ghana</item>
        <item>Gibraltar</item>
        <item>Greece</item>
        <item>Greenland</item>
        <item>Grenada</item>
        <item>Guadeloupe</item>
        <item>Guam</item>
        <item>Guatemala</item>
        <item>Guinea</item>
        <item>Guinea-Bissau</item>
        <item>Guyana</item>
        <item>Haiti</item>
        <item>Heard Island and McDonald Islands</item>
        <item>Honduras</item>
        <item>Hong Kong</item>
        <item>Hungary</item>
        <item>Iceland</item>
        <item>India</item>
        <item>Indonesia</item>
        <item>Iran</item>
        <item>Iraq</item>
        <item>Ireland</item>
        <item>Israel</item>
        <item>Italy</item>
        <item>Jamaica</item>
        <item>Japan</item>
        <item>Jordan</item>
        <item>Kazakhstan</item>
        <item>Kenya</item>
        <item>Kiribati</item>
        <item>Kuwait</item>
        <item>Kyrgyzstan</item>
        <item>Laos</item>
        <item>Latvia</item>
        <item>Lebanon</item>
        <item>Lesotho</item>
        <item>Liberia</item>
        <item>Libya</item>
        <item>Liechtenstein</item>
        <item>Lithuania</item>
        <item>Luxembourg</item>
        <item>Macau</item>
        <item>Madagascar</item>
        <item>Malawi</item>
        <item>Malaysia</item>
        <item>Maldives</item>
        <item>Mali</item>
        <item>Malta</item>
        <item>Marshall Islands</item>
        <item>Martinique</item>
        <item>Mauritania</item>
        <item>Mauritius</item>
        <item>Mayotte</item>
        <item>Mexico</item>
        <item>Micronesia</item>
        <item>Moldova</item>
        <item>Monaco</item>
        <item>Mongolia</item>
        <item>Montserrat</item>
        <item>Morocco</item>
        <item>Mozambique</item>
        <item>Myanmar</item>
        <item>Namibia</item>
        <item>Nauru</item>
        <item>Nepal</item>
        <item>Netherlands</item>
        <item>Netherlands Antilles</item>
        <item>New Caledonia</item>
        <item>New Zealand</item>
        <item>Nicaragua</item>
        <item>Niger</item>
        <item>Nigeria</item>
        <item>Niue</item>
        <item>Norfolk Island</item>
        <item>North Korea</item>
        <item>Northern Marianas</item>
        <item>Norway</item>
        <item>Oman</item>
        <item>Pakistan</item>
        <item>Palau</item>
        <item>Panama</item>
        <item>Papua New Guinea</item>
        <item>Paraguay</item>
        <item>Peru</item>
        <item>Philippines</item>
        <item>Pitcairn Islands</item>
        <item>Poland</item>
        <item>Portugal</item>
        <item>Puerto Rico</item>
        <item>Qatar</item>
        <item>Reunion</item>
        <item>Romania</item>
        <item>Russia</item>
        <item>Rwanda</item>
        <item>Sqo Tome and Principe</item>
        <item>Saint Helena</item>
        <item>Saint Kitts and Nevis</item>
        <item>Saint Lucia</item>
        <item>Saint Pierre and Miquelon</item>
        <item>Saint Vincent and the Grenadines</item>
        <item>Samoa</item>
        <item>San Marino</item>
        <item>Saudi Arabia</item>
        <item>Senegal</item>
        <item>Seychelles</item>
        <item>Sierra Leone</item>
        <item>Singapore</item>
        <item>Slovakia</item>
        <item>Slovenia</item>
        <item>Solomon Islands</item>
        <item>Somalia</item>
        <item>South Africa</item>
        <item>South Georgia and the South Sandwich Islands</item>
        <item>South Korea</item>
        <item>Spain</item>
        <item>Sri Lanka</item>
        <item>Sudan</item>
        <item>Suriname</item>
        <item>Svalbard and Jan Mayen</item>
        <item>Swaziland</item>
        <item>Sweden</item>
        <item>Switzerland</item>
        <item>Syria</item>
        <item>Taiwan</item>
        <item>Tajikistan</item>
        <item>Tanzania</item>
        <item>Thailand</item>
        <item>The Bahamas</item>
        <item>The Gambia</item>
        <item>Togo</item>
        <item>Tokelau</item>
        <item>Tonga</item>
        <item>Trinidad and Tobago</item>
        <item>Tunisia</item>
        <item>Turkey</item>
        <item>Turkmenistan</item>
        <item>Turks and Caicos Islands</item>
        <item>Tuvalu</item>
        <item>Virgin Islands</item>
        <item>Uganda</item>
        <item>Ukraine</item>
        <item>United Arab Emirates</item>
        <item>United Kingdom</item>
        <item>United States</item>
        <item>United States Minor Outlying Islands</item>
        <item>Uruguay</item>
        <item>Uzbekistan</item>
        <item>Vanuatu</item>
        <item>Vatican City</item>
        <item>Venezuela</item>
        <item>Vietnam</item>
        <item>Wallis and Futuna</item>
        <item>Western Sahara</item>
        <item>Yemen</item>
        <item>Yugoslavia</item>
        <item>Zambia</item>
        <item>Zimbabwe</item>
    </string-array>
</resources>

実行します。

今回出てきたキーワードについて解説。

getResources

リソースを取得

getStringArray

リソースを文字列の配列で取得

setListAdapter

オブジェクトをListViewにアイテムを追加するための橋渡し

ArrayAdapter

配列をAdapterに渡すためのクラス

setOnItemClickListener

項目をクリック(タップ)した際のイベントリスナ登録

OnItemClickListener

項目をクリック(タップ)した際のイベントリスナ

onItemClick

リストの中の1つがクリック(タップ)されたときのイベント
引数 1:クリック(タップ)された要素を含むView(今回の場合はListView)
引数 2:クリック(タップ)された要素(今回の場合はTextView)
引数 3:クリック(タップ)されたID(0始まり)

Toast

画面にメッセージを表示する

ログろいど

2012年3月19日月曜日

Hello, Views (List View編)

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