Android Internalization and localization suggest change

Planning for localization Add RTL support in Layouts

Starting SDK 17 (Android 4.2), RTL support was added in Android layouts and is an essential part of localization. Going forward, the left/right notation in layouts should be replaced by start/end notation. If, however, your project has a minSdk value less than 17, then both left/right and start/end notation should be used in layouts.

For relative layouts, alignParentStart and alignParentEnd should be used, like so:

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"/>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"/>
</RelativeLayout>

For specifying gravity and layout gravity, similar notation should be used, like so :

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="left|start"
    android:gravity="left|start"/>
<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="right|end"
    android:gravity="right|end"/>

Paddings and margins should also be specified accordingly, like so :

<include layout="@layout/notification"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="12dp"
    android:layout_marginStart="12dp"
    android:paddingLeft="128dp"
    android:paddingStart="128dp"
    android:layout_toLeftOf="@id/cancel_action"
    android:layout_toStartOf="@id/cancel_action"/>
<include layout="@layout/notification2"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_marginRight="12dp"
    android:layout_marginEnd="12dp"
    android:paddingRight="128dp"
    android:paddingEnd="128dp"
    android:layout_toRightOf="@id/cancel_action"
    android:layout_toEndOf="@id/cancel_action"/>

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