My app stopped on setContentView() on <= API 21

I have an app which works on API 24 perfectly, but on API <= 21 some activity crashes on setContentView(...) and some ones do work correcty

any help please?

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layoutDirection="rtl"
android:id="@+id/main"

tools:context="com.......Bounds"
>

<LinearLayout


1 Answer
1

Solved
the problem was using
android:textDirection="firstStrongLtr"
witch not work on <= API 21

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