title: TextView is Not Showing any Text
body: <p>I just Installed Android Studio and Created a Project in it but whenever i add a TextView in it is not showing anything Even the <code>TextView</code> Already Created by the Android Studio Is not Showing 
  <code>Activity.xml</code> code is </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="wrap_content"
      tools:context=".MainActivity"
      tools:layout_editor_absoluteY="25dp"&gt;
  
      &lt;TextView
          android:id="@+id/textView2"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="TextView"
          app:layout_constraintBottom_toBottomOf="parent"
          tools:layout_editor_absoluteX="67dp"
          tools:text="Hello World" /&gt;
  
      &lt;TextView
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="Hello World!"
          tools:text="sdfsfsfsfs" /&gt;
  
      &lt;TextView
          android:id="@+id/textView"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
  
          tools:text="Hello World" /&gt;
  
  &lt;/android.support.constraint.ConstraintLayout&gt;
  </code></pre>
  
  <p>Any Help Would Be appreciated.</p>