title: Background not filling entire screen in scrollview android
body: <p>I'm developing an app and I need to fill the entire screen with a background, this view contains a scrollview. The problem is that the background is not covering the entire screen, it has a white stripe at the bottom, like the image below.</p>
  
  <p><a href="https://i.stack.imgur.com/0E6MF.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0E6MF.png" alt=""></a></p>
  
  <p>I have already tried many options of scaleType, like fitXY, centerInside, etc. none of them worked out.
  My XML is below.</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:fillViewport="true"&gt;
  
      &lt;android.support.constraint.ConstraintLayout
          android:layout_width="match_parent"
          android:layout_height="match_parent"&gt;
  
          &lt;ImageView
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:adjustViewBounds="true"
              android:scaleType="centerCrop"
              android:src="@drawable/signup_background" /&gt;
  
          &lt;LinearLayout
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:orientation="vertical"
              android:padding="40dp"&gt;
  
              &lt;de.hdodenhof.circleimageview.CircleImageView
                  android:id="@+id/image_view_photo"
                  android:layout_width="130dp"
                  android:layout_height="130dp"
                  android:layout_gravity="center"
                  android:layout_marginBottom="25dp"
                  android:src="@drawable/camera_icon" /&gt;
  
              &lt;android.support.v7.widget.AppCompatEditText
                  android:id="@+id/edit_text_name"
                  style="@style/BaseEditText"
                  android:layout_width="match_parent"
                  android:layout_height="wrap_content"
                  android:drawableLeft="@drawable/name_icon"
                  android:hint="@string/field_name"
                  android:inputType="textCapWords" /&gt;
  
              &lt;android.support.v7.widget.AppCompatEditText
                  android:id="@+id/edit_text_email"
                  style="@style/BaseEditText"
                  android:layout_width="match_parent"
                  android:layout_height="wrap_content"
                  android:drawableLeft="@drawable/email_icon"
                  android:hint="@string/field_email"
                  android:inputType="textEmailAddress" /&gt;
  
              &lt;android.support.v7.widget.AppCompatEditText
                  android:id="@+id/edit_text_password"
                  style="@style/BaseEditText"
                  android:layout_width="match_parent"
                  android:layout_height="wrap_content"
                  android:drawableLeft="@drawable/password_icon"
                  android:hint="@string/field_password"
                  android:inputType="textPassword" /&gt;
  
              &lt;android.support.v7.widget.AppCompatEditText
                  android:id="@+id/edit_text_confirm_password"
                  style="@style/BaseEditText"
                  android:layout_width="match_parent"
                  android:layout_height="wrap_content"
                  android:layout_marginBottom="35dp"
                  android:drawableLeft="@drawable/password_icon"
                  android:hint="@string/field_confirm_password"
                  android:inputType="textPassword" /&gt;
  
              &lt;com.jacksonueda.reachalert.Utils.LoadingButton
                  android:id="@+id/btn_signup"
                  android:layout_width="match_parent"
                  android:layout_height="wrap_content"
                  android:layout_marginBottom="10dp"
                  android:text="@string/action_sign_up" /&gt;
          &lt;/LinearLayout&gt;
      &lt;/android.support.constraint.ConstraintLayout&gt;
  &lt;/ScrollView&gt;
  </code></pre>
  
  <p>Can anyone help me? Thanks.</p>