diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index 17a8fb55d5..17e8649509 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -168,6 +168,7 @@
         [#6725](https://github.com/google/ExoPlayer/issues/6725),
         [#7066](https://github.com/google/ExoPlayer/issues/7066)).
 *   Downloads and caching:
+    *   Add builder in `DownloadRequest`.
     *   Support passing an `Executor` to `DefaultDownloaderFactory` on which
         data downloads are performed.
     *   Parallelize and merge downloads in `SegmentDownloader` to improve
diff --git a/library/core/src/main/java/com/google/android/exoplayer2/offline/ActionFile.java b/library/core/src/main/java/com/google/android/exoplayer2/offline/ActionFile.java
index 0807241b1e..2f7db22326 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/offline/ActionFile.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/offline/ActionFile.java
@@ -140,10 +140,13 @@ import java.util.List;
       // Remove actions are not supported anymore.
       throw new UnsupportedRequestException();
     }
-    // keySetId and mimeType were not supported. Set keySetId to null and try to infer the mime
-    // type from the download type.
-    return new DownloadRequest(
-        id, uri, inferMimeType(downloadType), keys, /* keySetId= */ null, customCacheKey, data);
+
+    return new DownloadRequest.Builder(id, uri)
+        .setMimeType(inferMimeType(downloadType))
+        .setStreamKeys(keys)
+        .setCustomCacheKey(customCacheKey)
+        .setData(data)
+        .build();
   }
 
   private static StreamKey readKey(String type, int version, DataInputStream input)
diff --git a/library/core/src/main/java/com/google/android/exoplayer2/offline/DefaultDownloadIndex.java b/library/core/src/main/java/com/google/android/exoplayer2/offline/DefaultDownloadIndex.java
index 65701e5b22..d9a060fe2d 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/offline/DefaultDownloadIndex.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/offline/DefaultDownloadIndex.java
@@ -434,14 +434,15 @@ public final class DefaultDownloadIndex implements WritableDownloadIndex {
   private static Download getDownloadForCurrentRow(Cursor cursor) {
     byte[] keySetId = cursor.getBlob(COLUMN_INDEX_KEY_SET_ID);
     DownloadRequest request =
-        new DownloadRequest(
-            /* id= */ cursor.getString(COLUMN_INDEX_ID),
-            /* uri= */ Uri.parse(cursor.getString(COLUMN_INDEX_URI)),
-            /* mimeType= */ cursor.getString(COLUMN_INDEX_MIME_TYPE),
-            /* streamKeys= */ decodeStreamKeys(cursor.getString(COLUMN_INDEX_STREAM_KEYS)),
-            /* keySetId= */ keySetId.length > 0 ? keySetId : null,
-            /* customCacheKey= */ cursor.getString(COLUMN_INDEX_CUSTOM_CACHE_KEY),
-            /* data= */ cursor.getBlob(COLUMN_INDEX_DATA));
+        new DownloadRequest.Builder(
+                /* id= */ cursor.getString(COLUMN_INDEX_ID),
+                /* uri= */ Uri.parse(cursor.getString(COLUMN_INDEX_URI)))
+            .setMimeType(cursor.getString(COLUMN_INDEX_MIME_TYPE))
+            .setStreamKeys(decodeStreamKeys(cursor.getString(COLUMN_INDEX_STREAM_KEYS)))
+            .setKeySetId(keySetId.length > 0 ? keySetId : null)
+            .setCustomCacheKey(cursor.getString(COLUMN_INDEX_CUSTOM_CACHE_KEY))
+            .setData(cursor.getBlob(COLUMN_INDEX_DATA))
+            .build();
     DownloadProgress downloadProgress = new DownloadProgress();
     downloadProgress.bytesDownloaded = cursor.getLong(COLUMN_INDEX_BYTES_DOWNLOADED);
     downloadProgress.percentDownloaded = cursor.getFloat(COLUMN_INDEX_PERCENT_DOWNLOADED);
@@ -485,14 +486,13 @@ public final class DefaultDownloadIndex implements WritableDownloadIndex {
      * 13     bytes_downloaded    integer
      */
     DownloadRequest request =
-        new DownloadRequest(
-            /* id= */ cursor.getString(0),
-            /* uri= */ Uri.parse(cursor.getString(2)),
-            /* mimeType= */ inferMimeType(cursor.getString(1)),
-            /* streamKeys= */ decodeStreamKeys(cursor.getString(3)),
-            /* keySetId= */ null,
-            /* customCacheKey= */ cursor.getString(4),
-            /* data= */ cursor.getBlob(5));
+        new DownloadRequest.Builder(
+                /* id= */ cursor.getString(0), /* uri= */ Uri.parse(cursor.getString(2)))
+            .setMimeType(inferMimeType(cursor.getString(1)))
+            .setStreamKeys(decodeStreamKeys(cursor.getString(3)))
+            .setCustomCacheKey(cursor.getString(4))
+            .setData(cursor.getBlob(5))
+            .build();
     DownloadProgress downloadProgress = new DownloadProgress();
     downloadProgress.bytesDownloaded = cursor.getLong(13);
     downloadProgress.percentDownloaded = cursor.getFloat(12);
diff --git a/library/core/src/main/java/com/google/android/exoplayer2/offline/DownloadHelper.java b/library/core/src/main/java/com/google/android/exoplayer2/offline/DownloadHelper.java
index 2d373b6fb3..909a56e8f6 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/offline/DownloadHelper.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/offline/DownloadHelper.java
@@ -745,14 +745,11 @@ public final class DownloadHelper {
   public DownloadRequest getDownloadRequest(String id, @Nullable byte[] data) {
     if (mediaSource == null) {
       // TODO: add support for DRM (keySetId) [Internal ref: b/158980798]
-      return new DownloadRequest(
-          id,
-          playbackProperties.uri,
-          playbackProperties.mimeType,
-          /* streamKeys= */ Collections.emptyList(),
-          /* keySetId= */ null,
-          playbackProperties.customCacheKey,
-          data);
+      return new DownloadRequest.Builder(id, playbackProperties.uri)
+          .setMimeType(playbackProperties.mimeType)
+          .setCustomCacheKey(playbackProperties.customCacheKey)
+          .setData(data)
+          .build();
     }
     assertPreparedWithMedia();
     List<StreamKey> streamKeys = new ArrayList<>();
@@ -767,14 +764,12 @@ public final class DownloadHelper {
       streamKeys.addAll(mediaPreparer.mediaPeriods[periodIndex].getStreamKeys(allSelections));
     }
     // TODO: add support for DRM (keySetId) [Internal ref: b/158980798]
-    return new DownloadRequest(
-        id,
-        playbackProperties.uri,
-        playbackProperties.mimeType,
-        streamKeys,
-        /* keySetId= */ null,
-        playbackProperties.customCacheKey,
-        data);
+    return new DownloadRequest.Builder(id, playbackProperties.uri)
+        .setMimeType(playbackProperties.mimeType)
+        .setStreamKeys(streamKeys)
+        .setCustomCacheKey(playbackProperties.customCacheKey)
+        .setData(data)
+        .build();
   }
 
   // Initialization of array of Lists.
diff --git a/library/core/src/main/java/com/google/android/exoplayer2/offline/DownloadRequest.java b/library/core/src/main/java/com/google/android/exoplayer2/offline/DownloadRequest.java
index af0f329834..60c2289f2b 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/offline/DownloadRequest.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/offline/DownloadRequest.java
@@ -24,6 +24,7 @@ import androidx.annotation.Nullable;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.util.Assertions;
 import com.google.android.exoplayer2.util.Util;
+import com.google.common.collect.ImmutableList;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -36,6 +37,64 @@ public final class DownloadRequest implements Parcelable {
   /** Thrown when the encoded request data belongs to an unsupported request type. */
   public static class UnsupportedRequestException extends IOException {}
 
+  /** A builder for download requests. */
+  public static class Builder {
+    private final String id;
+    private final Uri uri;
+    @Nullable private String mimeType;
+    @Nullable private List<StreamKey> streamKeys;
+    @Nullable private byte[] keySetId;
+    @Nullable private String customCacheKey;
+    @Nullable private byte[] data;
+
+    /** Creates a new instance with the specified id and uri. */
+    public Builder(String id, Uri uri) {
+      this.id = id;
+      this.uri = uri;
+    }
+
+    /** Sets the {@link DownloadRequest#mimeType}. */
+    public Builder setMimeType(@Nullable String mimeType) {
+      this.mimeType = mimeType;
+      return this;
+    }
+
+    /** Sets the {@link DownloadRequest#streamKeys}. */
+    public Builder setStreamKeys(@Nullable List<StreamKey> streamKeys) {
+      this.streamKeys = streamKeys;
+      return this;
+    }
+
+    /** Sets the {@link DownloadRequest#keySetId}. */
+    public Builder setKeySetId(@Nullable byte[] keySetId) {
+      this.keySetId = keySetId;
+      return this;
+    }
+
+    /** Sets the {@link DownloadRequest#customCacheKey}. */
+    public Builder setCustomCacheKey(@Nullable String customCacheKey) {
+      this.customCacheKey = customCacheKey;
+      return this;
+    }
+
+    /** Sets the {@link DownloadRequest#data}. */
+    public Builder setData(@Nullable byte[] data) {
+      this.data = data;
+      return this;
+    }
+
+    public DownloadRequest build() {
+      return new DownloadRequest(
+          id,
+          uri,
+          mimeType,
+          streamKeys != null ? streamKeys : ImmutableList.of(),
+          keySetId,
+          customCacheKey,
+          data);
+    }
+  }
+
   /** The unique content id. */
   public final String id;
   /** The uri being downloaded. */
@@ -66,7 +125,7 @@ public final class DownloadRequest implements Parcelable {
    * @param customCacheKey See {@link #customCacheKey}.
    * @param data See {@link #data}.
    */
-  public DownloadRequest(
+  private DownloadRequest(
       String id,
       Uri uri,
       @Nullable String mimeType,
diff --git a/library/core/src/test/java/com/google/android/exoplayer2/offline/ActionFileTest.java b/library/core/src/test/java/com/google/android/exoplayer2/offline/ActionFileTest.java
index ffc34cac30..ad2685bad0 100644
--- a/library/core/src/test/java/com/google/android/exoplayer2/offline/ActionFileTest.java
+++ b/library/core/src/test/java/com/google/android/exoplayer2/offline/ActionFileTest.java
@@ -26,7 +26,6 @@ import com.google.android.exoplayer2.util.Util;
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
-import java.util.Collections;
 import org.junit.After;
 import org.junit.Assert;
 import org.junit.Before;
@@ -126,13 +125,9 @@ public class ActionFileTest {
   }
 
   private static DownloadRequest buildExpectedRequest(Uri uri, byte[] data) {
-    return new DownloadRequest(
-        /* id= */ uri.toString(),
-        uri,
-        /* mimeType= */ MimeTypes.VIDEO_UNKNOWN,
-        /* streamKeys= */ Collections.emptyList(),
-        /* keySetId= */ null,
-        /* customCacheKey= */ null,
-        data);
+    return new DownloadRequest.Builder(/* id= */ uri.toString(), uri)
+        .setMimeType(MimeTypes.VIDEO_UNKNOWN)
+        .setData(data)
+        .build();
   }
 }
diff --git a/library/core/src/test/java/com/google/android/exoplayer2/offline/ActionFileUpgradeUtilTest.java b/library/core/src/test/java/com/google/android/exoplayer2/offline/ActionFileUpgradeUtilTest.java
index df45f88401..1eea7c0d80 100644
--- a/library/core/src/test/java/com/google/android/exoplayer2/offline/ActionFileUpgradeUtilTest.java
+++ b/library/core/src/test/java/com/google/android/exoplayer2/offline/ActionFileUpgradeUtilTest.java
@@ -66,23 +66,18 @@ public class ActionFileUpgradeUtilTest {
       output.write(actionFileBytes);
     }
     DownloadRequest expectedRequest1 =
-        new DownloadRequest(
-            /* id= */ "http://www.test.com/1/video.mp4",
-            Uri.parse("http://www.test.com/1/video.mp4"),
-            /* mimeType= */ MimeTypes.VIDEO_UNKNOWN,
-            /* streamKeys= */ ImmutableList.of(),
-            /* keySetId= */ null,
-            /* customCacheKey= */ null,
-            /* data= */ null);
+        new DownloadRequest.Builder(
+                /* id= */ "http://www.test.com/1/video.mp4",
+                Uri.parse("http://www.test.com/1/video.mp4"))
+            .setMimeType(MimeTypes.VIDEO_UNKNOWN)
+            .build();
     DownloadRequest expectedRequest2 =
-        new DownloadRequest(
-            /* id= */ "customCacheKey",
-            Uri.parse("http://www.test.com/2/video.mp4"),
-            /* mimeType= */ MimeTypes.VIDEO_UNKNOWN,
-            /* streamKeys= */ ImmutableList.of(),
-            /* keySetId= */ null,
-            /* customCacheKey= */ "customCacheKey",
-            /* data= */ new byte[] {0, 1, 2, 3});
+        new DownloadRequest.Builder(
+                /* id= */ "customCacheKey", Uri.parse("http://www.test.com/2/video.mp4"))
+            .setMimeType(MimeTypes.VIDEO_UNKNOWN)
+            .setCustomCacheKey("customCacheKey")
+            .setData(new byte[] {0, 1, 2, 3})
+            .build();
 
     ActionFileUpgradeUtil.upgradeAndDelete(
         tempFile,
@@ -106,25 +101,22 @@ public class ActionFileUpgradeUtilTest {
       output.write(actionFileBytes);
     }
     DownloadRequest expectedRequest1 =
-        new DownloadRequest(
-            /* id= */ "http://www.test.com/1/manifest.mpd",
-            Uri.parse("http://www.test.com/1/manifest.mpd"),
-            MimeTypes.APPLICATION_MPD,
-            /* streamKeys= */ ImmutableList.of(),
-            /* keySetId= */ null,
-            /* customCacheKey= */ null,
-            /* data= */ null);
+        new DownloadRequest.Builder(
+                /* id= */ "http://www.test.com/1/manifest.mpd",
+                Uri.parse("http://www.test.com/1/manifest.mpd"))
+            .setMimeType(MimeTypes.APPLICATION_MPD)
+            .build();
     DownloadRequest expectedRequest2 =
-        new DownloadRequest(
-            /* id= */ "http://www.test.com/2/manifest.mpd",
-            Uri.parse("http://www.test.com/2/manifest.mpd"),
-            MimeTypes.APPLICATION_MPD,
-            ImmutableList.of(
-                new StreamKey(/* groupIndex= */ 0, /* trackIndex= */ 0),
-                new StreamKey(/* groupIndex= */ 1, /* trackIndex= */ 1)),
-            /* keySetId= */ null,
-            /* customCacheKey= */ null,
-            /* data= */ new byte[] {0, 1, 2, 3});
+        new DownloadRequest.Builder(
+                /* id= */ "http://www.test.com/2/manifest.mpd",
+                Uri.parse("http://www.test.com/2/manifest.mpd"))
+            .setMimeType(MimeTypes.APPLICATION_MPD)
+            .setStreamKeys(
+                ImmutableList.of(
+                    new StreamKey(/* groupIndex= */ 0, /* trackIndex= */ 0),
+                    new StreamKey(/* groupIndex= */ 1, /* trackIndex= */ 1)))
+            .setData(new byte[] {0, 1, 2, 3})
+            .build();
 
     ActionFileUpgradeUtil.upgradeAndDelete(
         tempFile,
@@ -148,25 +140,22 @@ public class ActionFileUpgradeUtilTest {
       output.write(actionFileBytes);
     }
     DownloadRequest expectedRequest1 =
-        new DownloadRequest(
-            /* id= */ "http://www.test.com/1/manifest.m3u8",
-            Uri.parse("http://www.test.com/1/manifest.m3u8"),
-            MimeTypes.APPLICATION_M3U8,
-            /* streamKeys= */ ImmutableList.of(),
-            /* keySetId= */ null,
-            /* customCacheKey= */ null,
-            /* data= */ null);
+        new DownloadRequest.Builder(
+                /* id= */ "http://www.test.com/1/manifest.m3u8",
+                Uri.parse("http://www.test.com/1/manifest.m3u8"))
+            .setMimeType(MimeTypes.APPLICATION_M3U8)
+            .build();
     DownloadRequest expectedRequest2 =
-        new DownloadRequest(
-            /* id= */ "http://www.test.com/2/manifest.m3u8",
-            Uri.parse("http://www.test.com/2/manifest.m3u8"),
-            MimeTypes.APPLICATION_M3U8,
-            ImmutableList.of(
-                new StreamKey(/* groupIndex= */ 0, /* trackIndex= */ 0),
-                new StreamKey(/* groupIndex= */ 1, /* trackIndex= */ 1)),
-            /* keySetId= */ null,
-            /* customCacheKey= */ null,
-            /* data= */ new byte[] {0, 1, 2, 3});
+        new DownloadRequest.Builder(
+                /* id= */ "http://www.test.com/2/manifest.m3u8",
+                Uri.parse("http://www.test.com/2/manifest.m3u8"))
+            .setMimeType(MimeTypes.APPLICATION_M3U8)
+            .setStreamKeys(
+                ImmutableList.of(
+                    new StreamKey(/* groupIndex= */ 0, /* trackIndex= */ 0),
+                    new StreamKey(/* groupIndex= */ 1, /* trackIndex= */ 1)))
+            .setData(new byte[] {0, 1, 2, 3})
+            .build();
 
     ActionFileUpgradeUtil.upgradeAndDelete(
         tempFile,
@@ -190,25 +179,22 @@ public class ActionFileUpgradeUtilTest {
       output.write(actionFileBytes);
     }
     DownloadRequest expectedRequest1 =
-        new DownloadRequest(
-            /* id= */ "http://www.test.com/1/video.ism/manifest",
-            Uri.parse("http://www.test.com/1/video.ism/manifest"),
-            MimeTypes.APPLICATION_SS,
-            /* streamKeys= */ ImmutableList.of(),
-            /* keySetId= */ null,
-            /* customCacheKey= */ null,
-            /* data= */ null);
+        new DownloadRequest.Builder(
+                /* id= */ "http://www.test.com/1/video.ism/manifest",
+                Uri.parse("http://www.test.com/1/video.ism/manifest"))
+            .setMimeType(MimeTypes.APPLICATION_SS)
+            .build();
     DownloadRequest expectedRequest2 =
-        new DownloadRequest(
-            /* id= */ "http://www.test.com/2/video.ism/manifest",
-            Uri.parse("http://www.test.com/2/video.ism/manifest"),
-            MimeTypes.APPLICATION_SS,
-            ImmutableList.of(
-                new StreamKey(/* groupIndex= */ 0, /* trackIndex= */ 0),
-                new StreamKey(/* groupIndex= */ 1, /* trackIndex= */ 1)),
-            /* keySetId= */ null,
-            /* customCacheKey= */ null,
-            /* data= */ new byte[] {0, 1, 2, 3});
+        new DownloadRequest.Builder(
+                /* id= */ "http://www.test.com/2/video.ism/manifest",
+                Uri.parse("http://www.test.com/2/video.ism/manifest"))
+            .setMimeType(MimeTypes.APPLICATION_SS)
+            .setStreamKeys(
+                ImmutableList.of(
+                    new StreamKey(/* groupIndex= */ 0, /* trackIndex= */ 0),
+                    new StreamKey(/* groupIndex= */ 1, /* trackIndex= */ 1)))
+            .setData(new byte[] {0, 1, 2, 3})
+            .build();
 
     ActionFileUpgradeUtil.upgradeAndDelete(
         tempFile,
@@ -225,16 +211,15 @@ public class ActionFileUpgradeUtilTest {
   @Test
   public void mergeRequest_nonExistingDownload_createsNewDownload() throws IOException {
     DownloadRequest request =
-        new DownloadRequest(
-            /* id= */ "id",
-            Uri.parse("https://www.test.com/download"),
-            /* mimeType= */ null,
-            ImmutableList.of(
-                new StreamKey(/* periodIndex= */ 0, /* groupIndex= */ 1, /* trackIndex= */ 2),
-                new StreamKey(/* periodIndex= */ 3, /* groupIndex= */ 4, /* trackIndex= */ 5)),
-            /* keySetId= */ new byte[] {1, 2, 3, 4},
-            /* customCacheKey= */ "key123",
-            /* data= */ new byte[] {1, 2, 3, 4});
+        new DownloadRequest.Builder(/* id= */ "id", Uri.parse("https://www.test.com/download"))
+            .setStreamKeys(
+                ImmutableList.of(
+                    new StreamKey(/* periodIndex= */ 0, /* groupIndex= */ 1, /* trackIndex= */ 2),
+                    new StreamKey(/* periodIndex= */ 3, /* groupIndex= */ 4, /* trackIndex= */ 5)))
+            .setKeySetId(new byte[] {1, 2, 3, 4})
+            .setCustomCacheKey("key123")
+            .setData(new byte[] {1, 2, 3, 4})
+            .build();
 
     ActionFileUpgradeUtil.mergeRequest(
         request, downloadIndex, /* addNewDownloadAsCompleted= */ false, NOW_MS);
@@ -249,23 +234,20 @@ public class ActionFileUpgradeUtilTest {
     StreamKey streamKey2 =
         new StreamKey(/* periodIndex= */ 0, /* groupIndex= */ 1, /* trackIndex= */ 2);
     DownloadRequest request1 =
-        new DownloadRequest(
-            /* id= */ "id",
-            Uri.parse("https://www.test.com/download1"),
-            /* mimeType= */ null,
-            ImmutableList.of(streamKey1),
-            /* keySetId= */ new byte[] {1, 2, 3, 4},
-            /* customCacheKey= */ "key123",
-            /* data= */ new byte[] {1, 2, 3, 4});
+        new DownloadRequest.Builder(/* id= */ "id", Uri.parse("https://www.test.com/download1"))
+            .setStreamKeys(ImmutableList.of(streamKey1))
+            .setKeySetId(new byte[] {1, 2, 3, 4})
+            .setCustomCacheKey("key123")
+            .setData(new byte[] {1, 2, 3, 4})
+            .build();
     DownloadRequest request2 =
-        new DownloadRequest(
-            /* id= */ "id",
-            Uri.parse("https://www.test.com/download2"),
-            /* mimeType= */ MimeTypes.APPLICATION_MP4,
-            ImmutableList.of(streamKey2),
-            /* keySetId= */ new byte[] {5, 4, 3, 2, 1},
-            /* customCacheKey= */ "key345",
-            /* data= */ new byte[] {5, 4, 3, 2, 1});
+        new DownloadRequest.Builder(/* id= */ "id", Uri.parse("https://www.test.com/download2"))
+            .setMimeType(MimeTypes.APPLICATION_MP4)
+            .setStreamKeys(ImmutableList.of(streamKey2))
+            .setKeySetId(new byte[] {5, 4, 3, 2, 1})
+            .setCustomCacheKey("key345")
+            .setData(new byte[] {5, 4, 3, 2, 1})
+            .build();
 
     ActionFileUpgradeUtil.mergeRequest(
         request1, downloadIndex, /* addNewDownloadAsCompleted= */ false, NOW_MS);
@@ -290,23 +272,19 @@ public class ActionFileUpgradeUtilTest {
     StreamKey streamKey2 =
         new StreamKey(/* periodIndex= */ 0, /* groupIndex= */ 1, /* trackIndex= */ 2);
     DownloadRequest request1 =
-        new DownloadRequest(
-            /* id= */ "id1",
-            Uri.parse("https://www.test.com/download1"),
-            /* mimeType= */ null,
-            ImmutableList.of(streamKey1),
-            /* keySetId= */ new byte[] {1, 2, 3, 4},
-            /* customCacheKey= */ "key123",
-            /* data= */ new byte[] {1, 2, 3, 4});
+        new DownloadRequest.Builder(/* id= */ "id1", Uri.parse("https://www.test.com/download1"))
+            .setStreamKeys(ImmutableList.of(streamKey1))
+            .setKeySetId(new byte[] {1, 2, 3, 4})
+            .setCustomCacheKey("key123")
+            .setData(new byte[] {1, 2, 3, 4})
+            .build();
     DownloadRequest request2 =
-        new DownloadRequest(
-            /* id= */ "id2",
-            Uri.parse("https://www.test.com/download2"),
-            /* mimeType= */ null,
-            ImmutableList.of(streamKey2),
-            /* keySetId= */ new byte[] {5, 4, 3, 2, 1},
-            /* customCacheKey= */ "key123",
-            /* data= */ new byte[] {5, 4, 3, 2, 1});
+        new DownloadRequest.Builder(/* id= */ "id2", Uri.parse("https://www.test.com/download2"))
+            .setStreamKeys(ImmutableList.of(streamKey2))
+            .setKeySetId(new byte[] {5, 4, 3, 2, 1})
+            .setCustomCacheKey("key456")
+            .setData(new byte[] {5, 4, 3, 2, 1})
+            .build();
     ActionFileUpgradeUtil.mergeRequest(
         request1, downloadIndex, /* addNewDownloadAsCompleted= */ false, NOW_MS);
 
diff --git a/library/core/src/test/java/com/google/android/exoplayer2/offline/DefaultDownloadIndexTest.java b/library/core/src/test/java/com/google/android/exoplayer2/offline/DefaultDownloadIndexTest.java
index 313ee86413..c8b2f24056 100644
--- a/library/core/src/test/java/com/google/android/exoplayer2/offline/DefaultDownloadIndexTest.java
+++ b/library/core/src/test/java/com/google/android/exoplayer2/offline/DefaultDownloadIndexTest.java
@@ -385,15 +385,15 @@ public class DefaultDownloadIndexTest {
 
   private static Download createDownload(
       String uri, String mimeType, List<StreamKey> streamKeys, @Nullable String customCacheKey) {
+    DownloadRequest downloadRequest =
+        new DownloadRequest.Builder(uri, Uri.parse(uri))
+            .setMimeType(mimeType)
+            .setStreamKeys(streamKeys)
+            .setCustomCacheKey(customCacheKey)
+            .setData(new byte[] {0, 1, 2, 3})
+            .build();
     return new Download(
-        new DownloadRequest(
-            uri,
-            Uri.parse(uri),
-            mimeType,
-            streamKeys,
-            /* keySetId= */ null,
-            customCacheKey,
-            /* data= */ new byte[] {0, 1, 2, 3}),
+        downloadRequest,
         /* state= */ STATE_STOPPED,
         /* startTimeMs= */ 1,
         /* updateTimeMs= */ 2,
diff --git a/library/core/src/test/java/com/google/android/exoplayer2/offline/DefaultDownloaderFactoryTest.java b/library/core/src/test/java/com/google/android/exoplayer2/offline/DefaultDownloaderFactoryTest.java
index d3789c530e..9cf52ce568 100644
--- a/library/core/src/test/java/com/google/android/exoplayer2/offline/DefaultDownloaderFactoryTest.java
+++ b/library/core/src/test/java/com/google/android/exoplayer2/offline/DefaultDownloaderFactoryTest.java
@@ -22,7 +22,6 @@ import androidx.test.ext.junit.runners.AndroidJUnit4;
 import com.google.android.exoplayer2.upstream.DummyDataSource;
 import com.google.android.exoplayer2.upstream.cache.Cache;
 import com.google.android.exoplayer2.upstream.cache.CacheDataSource;
-import java.util.Collections;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.Mockito;
@@ -42,14 +41,8 @@ public final class DefaultDownloaderFactoryTest {
 
     Downloader downloader =
         factory.createDownloader(
-            new DownloadRequest(
-                /* id= */ "id",
-                Uri.parse("https://www.test.com/download"),
-                /* mimeType= */ null,
-                /* streamKeys= */ Collections.emptyList(),
-                /* keySetId= */ null,
-                /* customCacheKey= */ null,
-                /* data= */ null));
+            new DownloadRequest.Builder(/* id= */ "id", Uri.parse("https://www.test.com/download"))
+                .build());
     assertThat(downloader).isInstanceOf(ProgressiveDownloader.class);
   }
 }
diff --git a/library/core/src/test/java/com/google/android/exoplayer2/offline/DownloadManagerTest.java b/library/core/src/test/java/com/google/android/exoplayer2/offline/DownloadManagerTest.java
index 329b80dfea..d5959584ad 100644
--- a/library/core/src/test/java/com/google/android/exoplayer2/offline/DownloadManagerTest.java
+++ b/library/core/src/test/java/com/google/android/exoplayer2/offline/DownloadManagerTest.java
@@ -16,6 +16,7 @@
 package com.google.android.exoplayer2.offline;
 
 import static com.google.common.truth.Truth.assertThat;
+import static java.util.Arrays.asList;
 
 import android.net.Uri;
 import androidx.annotation.GuardedBy;
@@ -33,7 +34,6 @@ import com.google.android.exoplayer2.util.Assertions;
 import com.google.android.exoplayer2.util.ConditionVariable;
 import java.io.IOException;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.atomic.AtomicReference;
@@ -785,14 +785,9 @@ public class DownloadManagerTest {
   }
 
   private static DownloadRequest createDownloadRequest(String id, StreamKey... keys) {
-    return new DownloadRequest(
-        id,
-        Uri.parse("http://abc.com/ " + id),
-        /* mimeType= */ null,
-        Arrays.asList(keys),
-        /* keySetId= */ null,
-        /* customCacheKey= */ null,
-        /* data= */ null);
+    return new DownloadRequest.Builder(id, Uri.parse("http://abc.com/ " + id))
+        .setStreamKeys(asList(keys))
+        .build();
   }
 
   // Internal methods.
diff --git a/library/core/src/test/java/com/google/android/exoplayer2/offline/DownloadRequestTest.java b/library/core/src/test/java/com/google/android/exoplayer2/offline/DownloadRequestTest.java
index 0256215809..c4a101e946 100644
--- a/library/core/src/test/java/com/google/android/exoplayer2/offline/DownloadRequestTest.java
+++ b/library/core/src/test/java/com/google/android/exoplayer2/offline/DownloadRequestTest.java
@@ -16,14 +16,13 @@
 package com.google.android.exoplayer2.offline;
 
 import static com.google.common.truth.Truth.assertThat;
+import static java.util.Arrays.asList;
 import static org.junit.Assert.fail;
 
 import android.net.Uri;
 import android.os.Parcel;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 import java.util.ArrayList;
-import java.util.Collections;
-import java.util.List;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -43,24 +42,10 @@ public class DownloadRequestTest {
 
   @Test
   public void mergeRequests_withDifferentIds_fails() {
-    DownloadRequest request1 =
-        new DownloadRequest(
-            /* id= */ "id1",
-            uri1,
-            /* mimeType= */ null,
-            /* streamKeys= */ Collections.emptyList(),
-            /* keySetId= */ null,
-            /* customCacheKey= */ null,
-            /* data= */ null);
-    DownloadRequest request2 =
-        new DownloadRequest(
-            /* id= */ "id2",
-            uri2,
-            /* mimeType= */ null,
-            /* streamKeys= */ Collections.emptyList(),
-            /* keySetId= */ null,
-            /* customCacheKey= */ null,
-            /* data= */ null);
+
+    DownloadRequest request1 = new DownloadRequest.Builder(/* id= */ "id1", uri1).build();
+    DownloadRequest request2 = new DownloadRequest.Builder(/* id= */ "id2", uri2).build();
+
     try {
       request1.copyWithMergedRequest(request2);
       fail();
@@ -114,23 +99,17 @@ public class DownloadRequestTest {
     byte[] data2 = new byte[] {9, 10, 11};
 
     DownloadRequest request1 =
-        new DownloadRequest(
-            /* id= */ "id1",
-            uri1,
-            /* mimeType= */ null,
-            /* streamKeys= */ Collections.emptyList(),
-            keySetId1,
-            /* customCacheKey= */ "key1",
-            data1);
+        new DownloadRequest.Builder(/* id= */ "id1", uri1)
+            .setKeySetId(keySetId1)
+            .setCustomCacheKey("key1")
+            .setData(data1)
+            .build();
     DownloadRequest request2 =
-        new DownloadRequest(
-            /* id= */ "id1",
-            uri2,
-            /* mimeType= */ null,
-            /* streamKeys= */ Collections.emptyList(),
-            keySetId2,
-            /* customCacheKey= */ "key2",
-            data2);
+        new DownloadRequest.Builder(/* id= */ "id1", uri2)
+            .setKeySetId(keySetId2)
+            .setCustomCacheKey("key2")
+            .setData(data2)
+            .build();
 
     // uri, keySetId, customCacheKey and data should be from the request being merged.
     DownloadRequest mergedRequest = request1.copyWithMergedRequest(request2);
@@ -152,14 +131,12 @@ public class DownloadRequestTest {
     streamKeys.add(new StreamKey(1, 2, 3));
     streamKeys.add(new StreamKey(4, 5, 6));
     DownloadRequest requestToParcel =
-        new DownloadRequest(
-            /* id= */ "id",
-            Uri.parse("https://abc.def/ghi"),
-            /* mimeType= */ null,
-            streamKeys,
-            /* keySetId= */ new byte[] {1, 2, 3, 4, 5},
-            /* customCacheKey= */ "key",
-            /* data= */ new byte[] {1, 2, 3, 4, 5});
+        new DownloadRequest.Builder("id", Uri.parse("https://abc.def/ghi"))
+            .setStreamKeys(streamKeys)
+            .setKeySetId(new byte[] {1, 2, 3, 4, 5})
+            .setCustomCacheKey("key")
+            .setData(new byte[] {1, 2, 3, 4, 5})
+            .build();
     Parcel parcel = Parcel.obtain();
     requestToParcel.writeToParcel(parcel, 0);
     parcel.setDataPosition(0);
@@ -217,19 +194,6 @@ public class DownloadRequestTest {
   }
 
   private static DownloadRequest createRequest(Uri uri, StreamKey... keys) {
-    return new DownloadRequest(
-        uri.toString(),
-        uri,
-        /* mimeType= */ null,
-        toList(keys),
-        /* keySetId= */ null,
-        /* customCacheKey= */ null,
-        /* data= */ null);
-  }
-
-  private static List<StreamKey> toList(StreamKey... keys) {
-    ArrayList<StreamKey> keysList = new ArrayList<>();
-    Collections.addAll(keysList, keys);
-    return keysList;
+    return new DownloadRequest.Builder(uri.toString(), uri).setStreamKeys(asList(keys)).build();
   }
 }
diff --git a/library/dash/src/test/java/com/google/android/exoplayer2/source/dash/offline/DashDownloaderTest.java b/library/dash/src/test/java/com/google/android/exoplayer2/source/dash/offline/DashDownloaderTest.java
index b5a2bf3057..d835b85725 100644
--- a/library/dash/src/test/java/com/google/android/exoplayer2/source/dash/offline/DashDownloaderTest.java
+++ b/library/dash/src/test/java/com/google/android/exoplayer2/source/dash/offline/DashDownloaderTest.java
@@ -92,14 +92,12 @@ public class DashDownloaderTest {
 
     Downloader downloader =
         factory.createDownloader(
-            new DownloadRequest(
-                "id",
-                Uri.parse("https://www.test.com/download"),
-                MimeTypes.APPLICATION_MPD,
-                Collections.singletonList(new StreamKey(/* groupIndex= */ 0, /* trackIndex= */ 0)),
-                /* keySetId= */ null,
-                /* customCacheKey= */ null,
-                /* data= */ null));
+            new DownloadRequest.Builder(/* id= */ "id", Uri.parse("https://www.test.com/download"))
+                .setMimeType(MimeTypes.APPLICATION_MPD)
+                .setStreamKeys(
+                    Collections.singletonList(
+                        new StreamKey(/* groupIndex= */ 0, /* trackIndex= */ 0)))
+                .build());
     assertThat(downloader).isInstanceOf(DashDownloader.class);
   }
 
diff --git a/library/dash/src/test/java/com/google/android/exoplayer2/source/dash/offline/DownloadManagerDashTest.java b/library/dash/src/test/java/com/google/android/exoplayer2/source/dash/offline/DownloadManagerDashTest.java
index 14319c5755..2993bb4442 100644
--- a/library/dash/src/test/java/com/google/android/exoplayer2/source/dash/offline/DownloadManagerDashTest.java
+++ b/library/dash/src/test/java/com/google/android/exoplayer2/source/dash/offline/DownloadManagerDashTest.java
@@ -220,14 +220,10 @@ public class DownloadManagerDashTest {
   private DownloadRequest getDownloadRequest(StreamKey... keys) {
     ArrayList<StreamKey> keysList = new ArrayList<>();
     Collections.addAll(keysList, keys);
-    return new DownloadRequest(
-        TEST_ID,
-        TEST_MPD_URI,
-        MimeTypes.APPLICATION_MPD,
-        keysList,
-        /* keySetId= */ null,
-        /* customCacheKey= */ null,
-        null);
+    return new DownloadRequest.Builder(TEST_ID, TEST_MPD_URI)
+        .setMimeType(MimeTypes.APPLICATION_MPD)
+        .setStreamKeys(keysList)
+        .build();
   }
 
   private void handleRemoveAction() {
diff --git a/library/dash/src/test/java/com/google/android/exoplayer2/source/dash/offline/DownloadServiceDashTest.java b/library/dash/src/test/java/com/google/android/exoplayer2/source/dash/offline/DownloadServiceDashTest.java
index 3d0db421cf..6b528cdd82 100644
--- a/library/dash/src/test/java/com/google/android/exoplayer2/source/dash/offline/DownloadServiceDashTest.java
+++ b/library/dash/src/test/java/com/google/android/exoplayer2/source/dash/offline/DownloadServiceDashTest.java
@@ -206,14 +206,11 @@ public class DownloadServiceDashTest {
     ArrayList<StreamKey> keysList = new ArrayList<>();
     Collections.addAll(keysList, keys);
     DownloadRequest action =
-        new DownloadRequest(
-            TEST_ID,
-            TEST_MPD_URI,
-            MimeTypes.APPLICATION_MPD,
-            keysList,
-            /* keySetId= */ null,
-            /* customCacheKey= */ null,
-            null);
+        new DownloadRequest.Builder(TEST_ID, TEST_MPD_URI)
+            .setMimeType(MimeTypes.APPLICATION_MPD)
+            .setStreamKeys(keysList)
+            .build();
+
     testThread.runOnMainThread(
         () -> {
           Intent startIntent =
diff --git a/library/hls/src/test/java/com/google/android/exoplayer2/source/hls/offline/HlsDownloaderTest.java b/library/hls/src/test/java/com/google/android/exoplayer2/source/hls/offline/HlsDownloaderTest.java
index d968af51bc..986ee4deda 100644
--- a/library/hls/src/test/java/com/google/android/exoplayer2/source/hls/offline/HlsDownloaderTest.java
+++ b/library/hls/src/test/java/com/google/android/exoplayer2/source/hls/offline/HlsDownloaderTest.java
@@ -110,14 +110,12 @@ public class HlsDownloaderTest {
 
     Downloader downloader =
         factory.createDownloader(
-            new DownloadRequest(
-                "id",
-                Uri.parse("https://www.test.com/download"),
-                MimeTypes.APPLICATION_M3U8,
-                Collections.singletonList(new StreamKey(/* groupIndex= */ 0, /* trackIndex= */ 0)),
-                /* keySetId= */ null,
-                /* customCacheKey= */ null,
-                /* data= */ null));
+            new DownloadRequest.Builder(/* id= */ "id", Uri.parse("https://www.test.com/download"))
+                .setMimeType(MimeTypes.APPLICATION_M3U8)
+                .setStreamKeys(
+                    Collections.singletonList(
+                        new StreamKey(/* groupIndex= */ 0, /* trackIndex= */ 0)))
+                .build());
     assertThat(downloader).isInstanceOf(HlsDownloader.class);
   }
 
diff --git a/library/smoothstreaming/src/test/java/com/google/android/exoplayer2/source/smoothstreaming/offline/SsDownloaderTest.java b/library/smoothstreaming/src/test/java/com/google/android/exoplayer2/source/smoothstreaming/offline/SsDownloaderTest.java
index 6d1bb28009..38132b55ed 100644
--- a/library/smoothstreaming/src/test/java/com/google/android/exoplayer2/source/smoothstreaming/offline/SsDownloaderTest.java
+++ b/library/smoothstreaming/src/test/java/com/google/android/exoplayer2/source/smoothstreaming/offline/SsDownloaderTest.java
@@ -48,14 +48,12 @@ public final class SsDownloaderTest {
 
     Downloader downloader =
         factory.createDownloader(
-            new DownloadRequest(
-                "id",
-                Uri.parse("https://www.test.com/download"),
-                MimeTypes.APPLICATION_SS,
-                Collections.singletonList(new StreamKey(/* groupIndex= */ 0, /* trackIndex= */ 0)),
-                /* keySetId= */ null,
-                /* customCacheKey= */ null,
-                /* data= */ null));
+            new DownloadRequest.Builder(/* id= */ "id", Uri.parse("https://www.test.com/download"))
+                .setMimeType(MimeTypes.APPLICATION_SS)
+                .setStreamKeys(
+                    Collections.singletonList(
+                        new StreamKey(/* groupIndex= */ 0, /* trackIndex= */ 0)))
+                .build());
     assertThat(downloader).isInstanceOf(SsDownloader.class);
   }
 }
diff --git a/testutils/src/main/java/com/google/android/exoplayer2/testutil/DownloadBuilder.java b/testutils/src/main/java/com/google/android/exoplayer2/testutil/DownloadBuilder.java
index c37d0df13c..184b7a11e4 100644
--- a/testutils/src/main/java/com/google/android/exoplayer2/testutil/DownloadBuilder.java
+++ b/testutils/src/main/java/com/google/android/exoplayer2/testutil/DownloadBuilder.java
@@ -198,7 +198,13 @@ public final class DownloadBuilder {
 
   public Download build() {
     DownloadRequest request =
-        new DownloadRequest(id, uri, mimeType, streamKeys, keySetId, cacheKey, customMetadata);
+        new DownloadRequest.Builder(id, uri)
+            .setMimeType(mimeType)
+            .setStreamKeys(streamKeys)
+            .setKeySetId(keySetId)
+            .setCustomCacheKey(cacheKey)
+            .setData(customMetadata)
+            .build();
     return new Download(
         request,
         state,