Open activity_main.xml file in res/layout and copy the following content.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:paddingLeft="5dp"
tools:context=".MainActivity"
android:baselineAligned="false" >
<ListView
android:id="@+id/list_fruits"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:paddingRight="5dp" >
</ListView>
<LinearLayout
android:id="@+id/side_index"
android:layout_width="50dp"
android:layout_height="fill_parent"
android:background="#c3c3c3"
android:gravity="center_horizontal"
android:orientation="vertical" >
</LinearLayout>
Create a new side_index_item.xml file in res/layout and copy the following content.
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/side_list_item"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:gravity="center"
android:padding="3dp"
android:textSize="14sp" />
Open res/values/strings.xml and edit to have the content as shown below. A string array is defined to have list of fruits.
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">AndroidListViewIndex</string>
<string name="action_settings">Settings</string>
<string name="hello_world">Hello world!</string>
<string-array name="fruits_array">
<item>Apples</item>
<item>Apricots</item>
<item>Avocado</item>
<item>Annona</item>
<item>Banana</item>
<item>Blueberry</item>
<item>Blackberry</item>
<item>Blackapple</item>
<item>Custard Apple</item>
<item>Clementine</item>
<item>Cantalope</item>
<item>Date</item>
<item>Elderberry</item>
<item>Fig</item>
<item>Grapefruit</item>
<item>Grape</item>
<item>Gooseberry</item>
<item>Guava</item>
<item>Honeydew melon</item>
<item>Jackfruit</item>
<item>Juniper Berry</item>
<item>Kiwi</item>
<item>Kumquat</item>
<item>Lemons</item>
<item>Limes</item>
<item>Lychee</item>
<item>Mango</item>
<item>Mandarin</item>
<item>Nectaraine</item>
<item>Orange</item>
<item>Olive</item>
<item>Prunes</item>
<item>Pears</item>
<item>Plum</item>
<item>Pineapple</item>
<item>Peach</item>
<item>Papaya</item>
<item>Pomelo</item>
<item>Raspberries</item>
<item>Rambutan</item>
<item>Strawberries</item>
<item>Sweety</item>
<item>Salmonberry</item>
<item>Tangerines</item>
<item>Tomato</item>
<item>Ugli</item>
<item>Watermelon</item>
<item>Woodapple</item>
</string-array>
</resources>
This is the main activity class.
private void getIndexList(String[] fruits) {
mapIndex = new LinkedHashMap<String, Integer>();
for (int i = 0; i < fruits.length; i++) {
String fruit = fruits[i];
String index = fruit.substring(0, 1);
if (mapIndex.get(index) == null)
mapIndex.put(index, i);
}
}
displayIndex() displays alphabetic indexer at the right and sets
OnClickListener for TextView.
When a letter from alphabet indexer is selected, it displays
corresponding list item.
For more understaing, i will suggest to do google for while, you will get a lot of tutorial. Here is the one I can recommend: http://www.brightec.co.uk/ideas/android-listview-alphabet-scroller
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