问题
I would like to add some space between the left display border and an ImageView. Android SDK made me aware of "android:layout_marginStart".
Consider adding android:layout_marginStart="10dp" to better support right-to-left layouts
Why should I use android:layout_marginStart="10dp" instead of android:layout_marginLeft="10dp"? I have never done so and never encountered any problems with so-called "right-to-left layouts".
回答1:
start and end are the same as left and right for left-to-right (LTR) languages. For right-to-left (RTL) languages (Arabic, Hebrew, etc.), start and end reverse and become equivalent to right and left, respectively.
This Android Developers Blog post gets into a bit more detail.
回答2:
Some APIs were introduced to support languages that use a right to left reading direction e.g Arabic and Hebrew.
One of which is android:layout_marginStart
See the link for more info : http://developer.android.com/about/versions/android-4.2.html#RTL
来源：https://stackoverflow.com/questions/25934106/what-is-androidlayout-marginstart