title: Constraints Layout of Android Studio doesn't work correctly
body: <p>I'm new in Android, i just create my first simple app on android studio, but constraints layout doesn't work correctly on real phone or virtual phone. I intent to put a button on the center of layout, and an edit text at top of layout, but when i run, both of it located same position at right-top layout, so i can't type a text and press the button.<br> I try to use RelativeLayout and it worked, so i guess the problem come from ConstraintLayout. Please help me fix it!<br><br>
  I have already install"ConstraintsLayout For Android 1.0.1 or lower", and "Solver For ConstraintsLayout 1.0.1 or lower". In build.gradle have added compile 'com.android.support.constraint:constraint-layout:1.0.1'
  I use Android Studio version 2.3.
  And here is my xml code:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;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="my.android.myfirstapp.MainActivity"&gt;
  
  
  &lt;Button
      android:id="@+id/btn_jump"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Jump Activity"
      tools:layout_editor_absoluteX="128dp"
      tools:layout_editor_absoluteY="269dp" /&gt;
  
  &lt;EditText
      android:id="@+id/edt_Name"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:ems="10"
      android:inputType="textPersonName"
      android:text=""
      tools:layout_editor_absoluteX="85dp"
      tools:layout_editor_absoluteY="62dp" /&gt;
  &lt;/android.support.constraint.ConstraintLayout&gt;
  </code></pre>
  
  <p>And here is my simple app when run:<br>
  <a href="https://i.stack.imgur.com/31NQt.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/31NQt.png" alt="enter image description here"></a></p>