diff --git a/app/src/main/java/com/hippo/ehviewer/spider/SpiderDen.kt b/app/src/main/java/com/hippo/ehviewer/spider/SpiderDen.kt
index e399cb6f3..d1b3af679 100644
--- a/app/src/main/java/com/hippo/ehviewer/spider/SpiderDen.kt
+++ b/app/src/main/java/com/hippo/ehviewer/spider/SpiderDen.kt
@@ -13,12 +13,9 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-@file:OptIn(ExperimentalCoilApi::class)
-
 package com.hippo.ehviewer.spider
 
 import android.webkit.MimeTypeMap
-import coil.annotation.ExperimentalCoilApi
 import coil.disk.DiskCache
 import com.hippo.Native.mapFd
 import com.hippo.Native.unmapDirectByteBuffer
diff --git a/app/src/main/java/com/hippo/io/UniFileOutputStreamPipe.java b/app/src/main/java/com/hippo/io/UniFileOutputStreamPipe.java
deleted file mode 100644
index 3dc2b27f1..000000000
--- a/app/src/main/java/com/hippo/io/UniFileOutputStreamPipe.java
+++ /dev/null
@@ -1,58 +0,0 @@
-/*
- * Copyright 2015 Hippo Seven
- *
- * 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.
- */
-
-package com.hippo.io;
-
-import androidx.annotation.NonNull;
-
-import com.hippo.streampipe.OutputStreamPipe;
-import com.hippo.unifile.UniFile;
-import com.hippo.yorozuya.IOUtils;
-
-import java.io.IOException;
-import java.io.OutputStream;
-
-public class UniFileOutputStreamPipe implements OutputStreamPipe {
-
-    private final UniFile mUniFile;
-    private OutputStream mOs;
-
-    public UniFileOutputStreamPipe(UniFile uniFile) {
-        mUniFile = uniFile;
-    }
-
-    @Override
-    public void release() {
-        // Empty
-    }
-
-    @NonNull
-    @Override
-    public OutputStream open() throws IOException {
-        if (mOs != null) {
-            throw new IllegalStateException("Please close it first");
-        }
-
-        mOs = mUniFile.openOutputStream();
-        return mOs;
-    }
-
-    @Override
-    public void close() {
-        IOUtils.closeQuietly(mOs);
-        mOs = null;
-    }
-}
diff --git a/app/src/main/java/com/hippo/streampipe/OutputStreamPipe.java b/app/src/main/java/com/hippo/streampipe/OutputStreamPipe.java
deleted file mode 100644
index 5dbbb6bac..000000000
--- a/app/src/main/java/com/hippo/streampipe/OutputStreamPipe.java
+++ /dev/null
@@ -1,32 +0,0 @@
-/*
- * Copyright 2015-2016 Hippo Seven
- *
- * 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.
- */
-
-package com.hippo.streampipe;
-
-import androidx.annotation.NonNull;
-
-import java.io.IOException;
-import java.io.OutputStream;
-
-public interface OutputStreamPipe {
-
-    void release();
-
-    @NonNull
-    OutputStream open() throws IOException;
-
-    void close();
-}