diff --git a/android/guava-tests/test/com/google/common/io/ByteStreamsTest.java b/android/guava-tests/test/com/google/common/io/ByteStreamsTest.java
index 5da435ad11dc..f715303e85a3 100644
--- a/android/guava-tests/test/com/google/common/io/ByteStreamsTest.java
+++ b/android/guava-tests/test/com/google/common/io/ByteStreamsTest.java
@@ -23,7 +23,6 @@
 import java.io.ByteArrayOutputStream;
 import java.io.EOFException;
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.FilterInputStream;
 import java.io.IOException;
@@ -42,7 +41,7 @@
  */
 public class ByteStreamsTest extends IoTestCase {
 
-  public void testCopy_channel() throws IOException {
+  public void testCopyChannel() throws IOException {
     byte[] expected = newPreFilledByteArray(100);
     ByteArrayOutputStream out = new ByteArrayOutputStream();
     WritableByteChannel outChannel = Channels.newChannel(out);
@@ -52,7 +51,7 @@ public void testCopy_channel() throws IOException {
     assertThat(out.toByteArray()).isEqualTo(expected);
   }
 
-  public void testCopy_channel_fromFile() throws IOException {
+  public void testCopyFileChannel() throws IOException {
     final int chunkSize = 14407; // Random prime, unlikely to match any internal chunk size
     ByteArrayOutputStream out = new ByteArrayOutputStream();
     WritableByteChannel outChannel = Channels.newChannel(out);
@@ -73,68 +72,6 @@ public void testCopy_channel_fromFile() throws IOException {
     }
   }
 
-  public void testCopy_stream() throws IOException {
-    byte[] expected = newPreFilledByteArray(100);
-    ByteArrayOutputStream out = new ByteArrayOutputStream();
-
-    ByteStreams.copy(new ByteArrayInputStream(expected), out);
-
-    assertThat(out.toByteArray()).isEqualTo(expected);
-  }
-
-  public void testCopy_stream_files_emptyDestination() throws IOException {
-    byte[] expected = new byte[] {0, 1, 2};
-    File inputFile = createTempFile(expected);
-    File outputFile = createTempFile();
-
-    try (FileInputStream inputStream = new FileInputStream(inputFile);
-        FileOutputStream outputStream = new FileOutputStream(outputFile)) {
-      ByteStreams.copy(inputStream, outputStream);
-    }
-
-    assertThat(Files.asByteSource(outputFile).read()).isEqualTo(expected);
-  }
-
-  public void testCopy_stream_files_appendDestination() throws IOException {
-    File inputFile = createTempFile(new byte[] {3, 4, 5});
-    File outputFile = createTempFile(new byte[] {0, 1, 2});
-
-    try (FileInputStream inputStream = new FileInputStream(inputFile);
-        FileOutputStream outputStream = new FileOutputStream(outputFile, /* append= */ true)) {
-      ByteStreams.copy(inputStream, outputStream);
-    }
-
-    assertThat(Files.asByteSource(outputFile).read()).isEqualTo(new byte[] {0, 1, 2, 3, 4, 5});
-  }
-
-  public void testCopy_stream_files_additionalWrites_emptyDestination() throws IOException {
-    File inputFile = createTempFile(new byte[] {0, 1, 2});
-    File outputFile = createTempFile();
-
-    try (FileInputStream inputStream = new FileInputStream(inputFile);
-        FileOutputStream outputStream = new FileOutputStream(outputFile)) {
-      outputStream.write(new byte[] {0, 0});
-      ByteStreams.copy(inputStream, outputStream);
-      outputStream.write(new byte[] {2, 2});
-    }
-
-    assertThat(Files.asByteSource(outputFile).read()).isEqualTo(new byte[] {0, 0, 0, 1, 2, 2, 2});
-  }
-
-  public void testCopy_stream_files_additionalWrites_appendDestination() throws IOException {
-    File inputFile = createTempFile(new byte[] {0, 1, 2});
-    File outputFile = createTempFile(new byte[] {0});
-
-    try (FileInputStream inputStream = new FileInputStream(inputFile);
-        FileOutputStream outputStream = new FileOutputStream(outputFile, /* append= */ true)) {
-      outputStream.write(new byte[] {0});
-      ByteStreams.copy(inputStream, outputStream);
-      outputStream.write(new byte[] {2, 2});
-    }
-
-    assertThat(Files.asByteSource(outputFile).read()).isEqualTo(new byte[] {0, 0, 0, 1, 2, 2, 2});
-  }
-
   public void testReadFully() throws IOException {
     byte[] b = new byte[10];
 
diff --git a/android/guava-tests/test/com/google/common/io/IoTestCase.java b/android/guava-tests/test/com/google/common/io/IoTestCase.java
index e7530b5edf47..fa8961905931 100644
--- a/android/guava-tests/test/com/google/common/io/IoTestCase.java
+++ b/android/guava-tests/test/com/google/common/io/IoTestCase.java
@@ -139,18 +139,6 @@ protected final File createTempFile() throws IOException {
     return File.createTempFile("test", null, getTempDir());
   }
 
-  /**
-   * Creates a new temp file in the temp directory returned by {@link #getTempDir()}. The file will
-   * be deleted in the tear-down for this test.
-   *
-   * @param content which should be written to the file
-   */
-  protected final File createTempFile(byte[] content) throws IOException {
-    File file = File.createTempFile("test", null, getTempDir());
-    Files.write(content, file);
-    return file;
-  }
-
   /** Returns a byte array of length size that has values 0 .. size - 1. */
   static byte[] newPreFilledByteArray(int size) {
     return newPreFilledByteArray(0, size);
diff --git a/android/guava/src/com/google/common/io/ByteStreams.java b/android/guava/src/com/google/common/io/ByteStreams.java
index f0d108a55f2a..868d200ca6f9 100644
--- a/android/guava/src/com/google/common/io/ByteStreams.java
+++ b/android/guava/src/com/google/common/io/ByteStreams.java
@@ -30,8 +30,6 @@
 import java.io.DataOutput;
 import java.io.DataOutputStream;
 import java.io.EOFException;
-import java.io.FileInputStream;
-import java.io.FileOutputStream;
 import java.io.FilterInputStream;
 import java.io.IOException;
 import java.io.InputStream;
@@ -105,15 +103,6 @@ private ByteStreams() {}
   public static long copy(InputStream from, OutputStream to) throws IOException {
     checkNotNull(from);
     checkNotNull(to);
-
-    // Use java.nio.channels in case we're copying from file to file.
-    // Copying through channels happens ideally in the kernel space and therefore faster.
-    if (from instanceof FileInputStream && to instanceof FileOutputStream) {
-      FileChannel fromChannel = ((FileInputStream) from).getChannel();
-      FileChannel toChannel = ((FileOutputStream) to).getChannel();
-      return copyFileChannel(fromChannel, toChannel);
-    }
-
     byte[] buf = createBuffer();
     long total = 0;
     while (true) {
@@ -141,7 +130,16 @@ public static long copy(ReadableByteChannel from, WritableByteChannel to) throws
     checkNotNull(from);
     checkNotNull(to);
     if (from instanceof FileChannel) {
-      return copyFileChannel((FileChannel) from, to);
+      FileChannel sourceChannel = (FileChannel) from;
+      long oldPosition = sourceChannel.position();
+      long position = oldPosition;
+      long copied;
+      do {
+        copied = sourceChannel.transferTo(position, ZERO_COPY_CHUNK_SIZE, to);
+        position += copied;
+        sourceChannel.position(position);
+      } while (copied > 0 || position < sourceChannel.size());
+      return position - oldPosition;
     }
 
     ByteBuffer buf = ByteBuffer.wrap(createBuffer());
@@ -156,18 +154,6 @@ public static long copy(ReadableByteChannel from, WritableByteChannel to) throws
     return total;
   }
 
-  private static long copyFileChannel(FileChannel from, WritableByteChannel to) throws IOException {
-    long oldPosition = from.position();
-    long position = oldPosition;
-    long copied;
-    do {
-      copied = from.transferTo(position, ZERO_COPY_CHUNK_SIZE, to);
-      position += copied;
-      from.position(position);
-    } while (copied > 0 || position < from.size());
-    return position - oldPosition;
-  }
-
   /** Max array length on JVM. */
   private static final int MAX_ARRAY_LEN = Integer.MAX_VALUE - 8;
 
diff --git a/guava-tests/test/com/google/common/io/ByteStreamsTest.java b/guava-tests/test/com/google/common/io/ByteStreamsTest.java
index 5da435ad11dc..f715303e85a3 100644
--- a/guava-tests/test/com/google/common/io/ByteStreamsTest.java
+++ b/guava-tests/test/com/google/common/io/ByteStreamsTest.java
@@ -23,7 +23,6 @@
 import java.io.ByteArrayOutputStream;
 import java.io.EOFException;
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.FilterInputStream;
 import java.io.IOException;
@@ -42,7 +41,7 @@
  */
 public class ByteStreamsTest extends IoTestCase {
 
-  public void testCopy_channel() throws IOException {
+  public void testCopyChannel() throws IOException {
     byte[] expected = newPreFilledByteArray(100);
     ByteArrayOutputStream out = new ByteArrayOutputStream();
     WritableByteChannel outChannel = Channels.newChannel(out);
@@ -52,7 +51,7 @@ public void testCopy_channel() throws IOException {
     assertThat(out.toByteArray()).isEqualTo(expected);
   }
 
-  public void testCopy_channel_fromFile() throws IOException {
+  public void testCopyFileChannel() throws IOException {
     final int chunkSize = 14407; // Random prime, unlikely to match any internal chunk size
     ByteArrayOutputStream out = new ByteArrayOutputStream();
     WritableByteChannel outChannel = Channels.newChannel(out);
@@ -73,68 +72,6 @@ public void testCopy_channel_fromFile() throws IOException {
     }
   }
 
-  public void testCopy_stream() throws IOException {
-    byte[] expected = newPreFilledByteArray(100);
-    ByteArrayOutputStream out = new ByteArrayOutputStream();
-
-    ByteStreams.copy(new ByteArrayInputStream(expected), out);
-
-    assertThat(out.toByteArray()).isEqualTo(expected);
-  }
-
-  public void testCopy_stream_files_emptyDestination() throws IOException {
-    byte[] expected = new byte[] {0, 1, 2};
-    File inputFile = createTempFile(expected);
-    File outputFile = createTempFile();
-
-    try (FileInputStream inputStream = new FileInputStream(inputFile);
-        FileOutputStream outputStream = new FileOutputStream(outputFile)) {
-      ByteStreams.copy(inputStream, outputStream);
-    }
-
-    assertThat(Files.asByteSource(outputFile).read()).isEqualTo(expected);
-  }
-
-  public void testCopy_stream_files_appendDestination() throws IOException {
-    File inputFile = createTempFile(new byte[] {3, 4, 5});
-    File outputFile = createTempFile(new byte[] {0, 1, 2});
-
-    try (FileInputStream inputStream = new FileInputStream(inputFile);
-        FileOutputStream outputStream = new FileOutputStream(outputFile, /* append= */ true)) {
-      ByteStreams.copy(inputStream, outputStream);
-    }
-
-    assertThat(Files.asByteSource(outputFile).read()).isEqualTo(new byte[] {0, 1, 2, 3, 4, 5});
-  }
-
-  public void testCopy_stream_files_additionalWrites_emptyDestination() throws IOException {
-    File inputFile = createTempFile(new byte[] {0, 1, 2});
-    File outputFile = createTempFile();
-
-    try (FileInputStream inputStream = new FileInputStream(inputFile);
-        FileOutputStream outputStream = new FileOutputStream(outputFile)) {
-      outputStream.write(new byte[] {0, 0});
-      ByteStreams.copy(inputStream, outputStream);
-      outputStream.write(new byte[] {2, 2});
-    }
-
-    assertThat(Files.asByteSource(outputFile).read()).isEqualTo(new byte[] {0, 0, 0, 1, 2, 2, 2});
-  }
-
-  public void testCopy_stream_files_additionalWrites_appendDestination() throws IOException {
-    File inputFile = createTempFile(new byte[] {0, 1, 2});
-    File outputFile = createTempFile(new byte[] {0});
-
-    try (FileInputStream inputStream = new FileInputStream(inputFile);
-        FileOutputStream outputStream = new FileOutputStream(outputFile, /* append= */ true)) {
-      outputStream.write(new byte[] {0});
-      ByteStreams.copy(inputStream, outputStream);
-      outputStream.write(new byte[] {2, 2});
-    }
-
-    assertThat(Files.asByteSource(outputFile).read()).isEqualTo(new byte[] {0, 0, 0, 1, 2, 2, 2});
-  }
-
   public void testReadFully() throws IOException {
     byte[] b = new byte[10];
 
diff --git a/guava-tests/test/com/google/common/io/IoTestCase.java b/guava-tests/test/com/google/common/io/IoTestCase.java
index e7530b5edf47..fa8961905931 100644
--- a/guava-tests/test/com/google/common/io/IoTestCase.java
+++ b/guava-tests/test/com/google/common/io/IoTestCase.java
@@ -139,18 +139,6 @@ protected final File createTempFile() throws IOException {
     return File.createTempFile("test", null, getTempDir());
   }
 
-  /**
-   * Creates a new temp file in the temp directory returned by {@link #getTempDir()}. The file will
-   * be deleted in the tear-down for this test.
-   *
-   * @param content which should be written to the file
-   */
-  protected final File createTempFile(byte[] content) throws IOException {
-    File file = File.createTempFile("test", null, getTempDir());
-    Files.write(content, file);
-    return file;
-  }
-
   /** Returns a byte array of length size that has values 0 .. size - 1. */
   static byte[] newPreFilledByteArray(int size) {
     return newPreFilledByteArray(0, size);
diff --git a/guava/src/com/google/common/io/ByteStreams.java b/guava/src/com/google/common/io/ByteStreams.java
index f0d108a55f2a..868d200ca6f9 100644
--- a/guava/src/com/google/common/io/ByteStreams.java
+++ b/guava/src/com/google/common/io/ByteStreams.java
@@ -30,8 +30,6 @@
 import java.io.DataOutput;
 import java.io.DataOutputStream;
 import java.io.EOFException;
-import java.io.FileInputStream;
-import java.io.FileOutputStream;
 import java.io.FilterInputStream;
 import java.io.IOException;
 import java.io.InputStream;
@@ -105,15 +103,6 @@ private ByteStreams() {}
   public static long copy(InputStream from, OutputStream to) throws IOException {
     checkNotNull(from);
     checkNotNull(to);
-
-    // Use java.nio.channels in case we're copying from file to file.
-    // Copying through channels happens ideally in the kernel space and therefore faster.
-    if (from instanceof FileInputStream && to instanceof FileOutputStream) {
-      FileChannel fromChannel = ((FileInputStream) from).getChannel();
-      FileChannel toChannel = ((FileOutputStream) to).getChannel();
-      return copyFileChannel(fromChannel, toChannel);
-    }
-
     byte[] buf = createBuffer();
     long total = 0;
     while (true) {
@@ -141,7 +130,16 @@ public static long copy(ReadableByteChannel from, WritableByteChannel to) throws
     checkNotNull(from);
     checkNotNull(to);
     if (from instanceof FileChannel) {
-      return copyFileChannel((FileChannel) from, to);
+      FileChannel sourceChannel = (FileChannel) from;
+      long oldPosition = sourceChannel.position();
+      long position = oldPosition;
+      long copied;
+      do {
+        copied = sourceChannel.transferTo(position, ZERO_COPY_CHUNK_SIZE, to);
+        position += copied;
+        sourceChannel.position(position);
+      } while (copied > 0 || position < sourceChannel.size());
+      return position - oldPosition;
     }
 
     ByteBuffer buf = ByteBuffer.wrap(createBuffer());
@@ -156,18 +154,6 @@ public static long copy(ReadableByteChannel from, WritableByteChannel to) throws
     return total;
   }
 
-  private static long copyFileChannel(FileChannel from, WritableByteChannel to) throws IOException {
-    long oldPosition = from.position();
-    long position = oldPosition;
-    long copied;
-    do {
-      copied = from.transferTo(position, ZERO_COPY_CHUNK_SIZE, to);
-      position += copied;
-      from.position(position);
-    } while (copied > 0 || position < from.size());
-    return position - oldPosition;
-  }
-
   /** Max array length on JVM. */
   private static final int MAX_ARRAY_LEN = Integer.MAX_VALUE - 8;