What is "android.R.layout.simple_list_item_1"?


Question

I've started learning Android development and am following a todolist example from a book:

// Create the array list of to do items
final ArrayList<String> todoItems = new ArrayList<String>();

// Create the array adapter to bind the array to the listView
final ArrayAdapter<String> aa;
aa = new ArrayAdapter<String>(  this, 
                                android.R.layout.simple_list_item_1,
                                todoItems
                            );
myListView.setAdapter(aa);

I can't understand exactly this code especially this line:

android.R.layout.simple_list_item_1
1
226
6/22/2015 8:40:50 AM

Accepted Answer

Zakaria, that is a reference to an built-in XML layout document that is part of the Android OS, rather than one of your own XML layouts.

Here is a further list of layouts that you can use: http://developer.android.com/reference/android/R.layout.html
(Updated link thanks @Estel: https://github.com/android/platform_frameworks_base/tree/master/core/res/res/layout )

You can actually view the code for the layouts.

257
7/3/2013 3:21:55 AM

This is a part of the android OS. Here is the actual version of the defined XML file.

simple_list_item_1:

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/text1"
    style="?android:attr/listItemFirstLineStyle"
    android:paddingTop="2dip"
    android:paddingBottom="3dip"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" />

simple_list_item_2:

<TwoLineListItem xmlns:android="http://schemas.android.com/apk/res/android"
    android:paddingTop="2dip"
    android:paddingBottom="2dip"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content">

    <TextView android:id="@android:id/text1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        style="?android:attr/listItemFirstLineStyle"/>

    <TextView android:id="@android:id/text2"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@android:id/text1"
        style="?android:attr/listItemSecondLineStyle" />

</TwoLineListItem> 

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