title: Image view doesn't appear on Activity (it's OK on AppCompatActivity)
body: <p>I have simple application which has one ImageView and text box</p>
  
  <p>At First I started with AppCompactActivity, it works.</p>
  
  <p>However when I changed AppCompatActivity to Activity.
  (I would like to delete the title bar)</p>
  
  <p>ImageView is disappeared(Droid).</p>
  
  <p>I think I have constraint of ImageView.</p>
  
  <p>How can I show the ImageView??</p>
  
  <p><a href="https://i.stack.imgur.com/8J6Ij.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8J6Ij.png" alt="enter image description here"></a></p>
  
  <pre><code>package jp.virararara.antbuid.bb;
  
  //import android.support.v7.app.AppCompatActivity
  import android.os.Bundle
  import android.app.Activity
  
  //class TopActivity : AppCompatActivity() {
  class TopActivity : Activity() {
  
      override fun onCreate(savedInstanceState: Bundle?) {
          super.onCreate(savedInstanceState)
          setContentView(R.layout.activity_top)
      }
  }
  </code></pre>
  
  <p>activity_top.xml</p>
  
  <p>
  </p>
  
  <pre><code>&lt;ImageView
      android:id="@+id/imageView3"
      android:layout_width="105dp"
      android:layout_height="208dp"
      android:layout_marginLeft="8dp"
      android:layout_marginRight="8dp"
      app:layout_constraintLeft_toLeftOf="parent"
      app:layout_constraintRight_toLeftOf="@+id/editText2"
      app:srcCompat="@mipmap/ic_launcher"
      app:layout_constraintTop_toTopOf="parent"
      android:layout_marginTop="16dp"
      app:layout_constraintHorizontal_bias="0.0" /&gt;
  
  &lt;EditText
      android:id="@+id/editText2"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_marginLeft="153dp"
      android:layout_marginTop="132dp"
      android:ems="10"
      android:inputType="textPersonName"
      android:text="Name"
      app:layout_constraintLeft_toLeftOf="parent"
      app:layout_constraintTop_toTopOf="parent" /&gt;
  </code></pre>
  
  <p></p>