diff --git a/demos/transformer/src/main/java/androidx/media3/demo/transformer/ConfigurationActivity.java b/demos/transformer/src/main/java/androidx/media3/demo/transformer/ConfigurationActivity.java
index 3f21bcdcfb..b6fd239d2c 100644
--- a/demos/transformer/src/main/java/androidx/media3/demo/transformer/ConfigurationActivity.java
+++ b/demos/transformer/src/main/java/androidx/media3/demo/transformer/ConfigurationActivity.java
@@ -67,6 +67,7 @@ public final class ConfigurationActivity extends AppCompatActivity {
   public static final String PERIODIC_VIGNETTE_CENTER_Y = "periodic_vignette_center_y";
   public static final String PERIODIC_VIGNETTE_INNER_RADIUS = "periodic_vignette_inner_radius";
   public static final String PERIODIC_VIGNETTE_OUTER_RADIUS = "periodic_vignette_outer_radius";
+  public static final String CONTRAST_VALUE = "contrast_value";
   private static final String[] INPUT_URIS = {
     "https://storage.googleapis.com/exoplayer-test-media-1/mp4/android-screens-10s.mp4",
     "https://storage.googleapis.com/exoplayer-test-media-0/android-block-1080-hevc.mp4",
@@ -100,13 +101,14 @@ public final class ConfigurationActivity extends AppCompatActivity {
   private static final String[] DEMO_EFFECTS = {
     "Dizzy crop",
     "Edge detector (Media Pipe)",
+    "Contrast",
     "Periodic vignette",
     "3D spin",
     "Overlay logo & timer",
     "Zoom in start",
-    "Increase contrast"
   };
-  private static final int PERIODIC_VIGNETTE_INDEX = 2;
+  private static final int CONTRAST_INDEX = 2;
+  private static final int PERIODIC_VIGNETTE_INDEX = 3;
   private static final String SAME_AS_INPUT_OPTION = "same as input";
   private static final float HALF_DIAGONAL = 1f / (float) Math.sqrt(2);
 
@@ -130,6 +132,7 @@ public final class ConfigurationActivity extends AppCompatActivity {
   private int inputUriPosition;
   private long trimStartMs;
   private long trimEndMs;
+  private float contrastValue;
   private float periodicVignetteCenterX;
   private float periodicVignetteCenterY;
   private float periodicVignetteInnerRadius;
@@ -285,6 +288,7 @@ public final class ConfigurationActivity extends AppCompatActivity {
         ENABLE_REQUEST_SDR_TONE_MAPPING, enableRequestSdrToneMappingCheckBox.isChecked());
     bundle.putBoolean(ENABLE_HDR_EDITING, enableHdrEditingCheckBox.isChecked());
     bundle.putBooleanArray(DEMO_EFFECTS_SELECTIONS, demoEffectsSelections);
+    bundle.putFloat(CONTRAST_VALUE, contrastValue);
     bundle.putFloat(PERIODIC_VIGNETTE_CENTER_X, periodicVignetteCenterX);
     bundle.putFloat(PERIODIC_VIGNETTE_CENTER_Y, periodicVignetteCenterY);
     bundle.putFloat(PERIODIC_VIGNETTE_INNER_RADIUS, periodicVignetteInnerRadius);
@@ -347,10 +351,35 @@ public final class ConfigurationActivity extends AppCompatActivity {
   @RequiresNonNull("demoEffectsSelections")
   private void selectDemoEffect(DialogInterface dialog, int which, boolean isChecked) {
     demoEffectsSelections[which] = isChecked;
-    if (!isChecked || which != PERIODIC_VIGNETTE_INDEX) {
+    if (!isChecked) {
       return;
     }
 
+    switch (which) {
+      case CONTRAST_INDEX:
+        controlContrastSettings();
+        break;
+      case PERIODIC_VIGNETTE_INDEX:
+        controlPeriodicVignetteSettings();
+        break;
+    }
+  }
+
+  private void controlContrastSettings() {
+    View dialogView = getLayoutInflater().inflate(R.layout.contrast_options, /* root= */ null);
+    Slider contrastSlider = checkNotNull(dialogView.findViewById(R.id.contrast_slider));
+    new AlertDialog.Builder(/* context= */ this)
+        .setView(dialogView)
+        .setPositiveButton(
+            android.R.string.ok,
+            (DialogInterface dialogInterface, int i) -> {
+              contrastValue = contrastSlider.getValue();
+            })
+        .create()
+        .show();
+  }
+
+  private void controlPeriodicVignetteSettings() {
     View dialogView =
         getLayoutInflater().inflate(R.layout.periodic_vignette_options, /* root= */ null);
     Slider centerXSlider =
diff --git a/demos/transformer/src/main/java/androidx/media3/demo/transformer/TransformerActivity.java b/demos/transformer/src/main/java/androidx/media3/demo/transformer/TransformerActivity.java
index bc0e3fdfb9..d9ae5d5a3a 100644
--- a/demos/transformer/src/main/java/androidx/media3/demo/transformer/TransformerActivity.java
+++ b/demos/transformer/src/main/java/androidx/media3/demo/transformer/TransformerActivity.java
@@ -301,6 +301,9 @@ public final class TransformerActivity extends AppCompatActivity {
           }
         }
         if (selectedEffects[2]) {
+          effects.add(new Contrast(bundle.getFloat(ConfigurationActivity.CONTRAST_VALUE)));
+        }
+        if (selectedEffects[3]) {
           effects.add(
               (GlEffect)
                   (Context context, boolean useHdr) ->
@@ -315,18 +318,14 @@ public final class TransformerActivity extends AppCompatActivity {
                               ConfigurationActivity.PERIODIC_VIGNETTE_OUTER_RADIUS),
                           bundle.getFloat(ConfigurationActivity.PERIODIC_VIGNETTE_OUTER_RADIUS)));
         }
-        if (selectedEffects[3]) {
+        if (selectedEffects[4]) {
           effects.add(MatrixTransformationFactory.createSpin3dEffect());
         }
-        if (selectedEffects[4]) {
+        if (selectedEffects[5]) {
           effects.add((GlEffect) BitmapOverlayProcessor::new);
         }
-        if (selectedEffects[5]) {
-          effects.add(MatrixTransformationFactory.createZoomInTransition());
-        }
         if (selectedEffects[6]) {
-          // TODO(b/238630175): Add slider for contrast adjustments.
-          effects.add(new Contrast(0.75f));
+          effects.add(MatrixTransformationFactory.createZoomInTransition());
         }
         transformerBuilder.setVideoEffects(effects.build());
       }
diff --git a/demos/transformer/src/main/res/layout/contrast_options.xml b/demos/transformer/src/main/res/layout/contrast_options.xml
new file mode 100644
index 0000000000..4ccfdc0db5
--- /dev/null
+++ b/demos/transformer/src/main/res/layout/contrast_options.xml
@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright 2022 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~      http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+<androidx.constraintlayout.widget.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="fill_parent"
+  android:layout_height="fill_parent"
+  tools:context=".ConfigurationActivity">
+
+  <TableLayout
+      android:layout_width="fill_parent"
+      android:layout_height="wrap_content"
+      android:stretchColumns="1"
+      android:layout_marginTop="32dp"
+      android:measureWithLargestChild="true"
+      android:paddingLeft="24dp"
+      android:paddingRight="12dp"
+      app:layout_constraintEnd_toEndOf="parent"
+      app:layout_constraintStart_toStartOf="parent"
+      app:layout_constraintTop_toTopOf="parent"
+      app:layout_constraintBottom_toBottomOf="parent">
+    <TableRow
+        android:layout_weight="1"
+        android:gravity="center_vertical" >
+        <TextView
+          android:text="@string/contrast_value" />
+        <com.google.android.material.slider.Slider
+          android:id="@+id/contrast_slider"
+          android:valueFrom="-1.0"
+          android:value="0.0"
+          android:valueTo="1.0"
+          android:layout_gravity="right"/>
+      </TableRow>
+  </TableLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/demos/transformer/src/main/res/values/strings.xml b/demos/transformer/src/main/res/values/strings.xml
index 69b68cded8..a1d40b5c0b 100644
--- a/demos/transformer/src/main/res/values/strings.xml
+++ b/demos/transformer/src/main/res/values/strings.xml
@@ -41,8 +41,9 @@
   <string name="transformation_timer" translatable="false">Transformation started %d seconds ago.</string>
   <string name="transformation_completed" translatable="false">Transformation completed in %d seconds.</string>
   <string name="transformation_error" translatable="false">Transformation error</string>
+  <string name="trim_range">Bounds in seconds</string>
+  <string name="contrast_value" translatable="false">Contrast value</string>
   <string name="center_x">Center X</string>
   <string name="center_y">Center Y</string>
   <string name="radius_range">Radius range</string>
-  <string name="trim_range">Bounds in seconds</string>
 </resources>