diff --git a/demos/main/src/main/java/com/google/android/exoplayer2/demo/DemoApplication.java b/demos/main/src/main/java/com/google/android/exoplayer2/demo/DemoApplication.java
index bc2ca738bc..f54a1a95e0 100644
--- a/demos/main/src/main/java/com/google/android/exoplayer2/demo/DemoApplication.java
+++ b/demos/main/src/main/java/com/google/android/exoplayer2/demo/DemoApplication.java
@@ -19,16 +19,26 @@ import android.app.Application;
 import com.google.android.exoplayer2.upstream.DataSource;
 import com.google.android.exoplayer2.upstream.DefaultDataSourceFactory;
 import com.google.android.exoplayer2.upstream.DefaultHttpDataSourceFactory;
+import com.google.android.exoplayer2.upstream.FileDataSourceFactory;
 import com.google.android.exoplayer2.upstream.HttpDataSource;
 import com.google.android.exoplayer2.upstream.TransferListener;
+import com.google.android.exoplayer2.upstream.cache.Cache;
+import com.google.android.exoplayer2.upstream.cache.CacheDataSource;
+import com.google.android.exoplayer2.upstream.cache.CacheDataSourceFactory;
+import com.google.android.exoplayer2.upstream.cache.NoOpCacheEvictor;
+import com.google.android.exoplayer2.upstream.cache.SimpleCache;
 import com.google.android.exoplayer2.util.Util;
+import java.io.File;
 
 /**
  * Placeholder application to facilitate overriding Application methods for debugging and testing.
  */
 public class DemoApplication extends Application {
 
+  private static final String DOWNLOAD_CACHE_FOLDER = "downloads";
+
   protected String userAgent;
+  private Cache downloadCache;
 
   @Override
   public void onCreate() {
@@ -38,7 +48,9 @@ public class DemoApplication extends Application {
 
   /** Returns a {@link DataSource.Factory}. */
   public DataSource.Factory buildDataSourceFactory(TransferListener<? super DataSource> listener) {
-    return new DefaultDataSourceFactory(this, listener, buildHttpDataSourceFactory(listener));
+    DefaultDataSourceFactory upstreamFactory =
+        new DefaultDataSourceFactory(this, listener, buildHttpDataSourceFactory(listener));
+    return createReadOnlyCacheDataSource(upstreamFactory, getDownloadCache());
   }
 
   /** Returns a {@link HttpDataSource.Factory}. */
@@ -47,8 +59,31 @@ public class DemoApplication extends Application {
     return new DefaultHttpDataSourceFactory(userAgent, listener);
   }
 
+  /** Returns the download {@link Cache}. */
+  public Cache getDownloadCache() {
+    if (downloadCache == null) {
+      File dir = getExternalFilesDir(null);
+      if (dir == null) {
+        dir = getFilesDir();
+      }
+      File downloadCacheFolder = new File(dir, DOWNLOAD_CACHE_FOLDER);
+      downloadCache = new SimpleCache(downloadCacheFolder, new NoOpCacheEvictor());
+    }
+    return downloadCache;
+  }
+
   public boolean useExtensionRenderers() {
     return "withExtensions".equals(BuildConfig.FLAVOR);
   }
 
+  private static CacheDataSourceFactory createReadOnlyCacheDataSource(
+      DefaultDataSourceFactory upstreamFactory, Cache cache) {
+    return new CacheDataSourceFactory(
+        cache,
+        upstreamFactory,
+        new FileDataSourceFactory(),
+        /*cacheWriteDataSinkFactory=*/ null,
+        CacheDataSource.FLAG_IGNORE_CACHE_ON_ERROR,
+        /*eventListener=*/ null);
+  }
 }