<?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"

 tools:context=".MainActivity">



 <TextView

 android:layout_width="wrap_content"

 android:layout_height="wrap_content"

 android:text="Hello World!"

 app:layout_constraintBottom_toBottomOf="parent"

 app:layout_constraintLeft_toLeftOf="parent"

 app:layout_constraintRight_toRightOf="parent"

 app:layout_constraintTop_toTopOf="parent" />



</android.support.constraint.ConstraintLayout>



<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" < ini yg bermasalah

android:layout_width="match_parent"

android:layout_height="match_parent"

androidaddingLeft="16dp"

androidaddingRight="16dp">

<EditText

 android:id="@+id/name"

 android:layout_width="match_parent"

 android:layout_height="wrap_content"

 android:hint="@string/reminder" />

<Spinner

 android:id="@+id/dates"

 android:layout_width="0dp"

 android:layout_height="wrap_content"

 android:layout_below="@id/name"

 android:layout_alignParentLeft="true"

 android:layout_toLeftOf="@+id/times" />

<Spinner

 android:id="@id/times"

 android:layout_width="96dp"

 android:layout_height="wrap_content"

 android:layout_below="@id/name"

 android:layout_alignParentRight="true" />

<Button

 android:layout_width="96dp"

 android:layout_height="wrap_content"

 android:layout_below="@id/times"

 android:layout_alignParentRight="true"

 android:text="@string/done" />

</RelativeLayout>