Add missing Nullable annotations to UsbDeviceConnection.controlTransfer.

The Javadoc already states that 'buffer' can be null.

Test: N/A, no functional change.
Change-Id: I55634f58a7f2aa4f6c0b8157798e2ade27cf75dc

2 files changed, 4 insertions, 4 deletions

diff --git a/core/api/current.txt b/core/api/current.txt
index b243374878fc..ee571b3b485a 100644
--- a/core/api/current.txt
+++ b/core/api/current.txt
@@ -18727,8 +18727,8 @@ package android.hardware.usb {
     method public int bulkTransfer(android.hardware.usb.UsbEndpoint, byte[], int, int, int);
     method public boolean claimInterface(android.hardware.usb.UsbInterface, boolean);
     method public void close();
-    method public int controlTransfer(int, int, int, int, byte[], int, int);
-    method public int controlTransfer(int, int, int, int, byte[], int, int, int);
+    method public int controlTransfer(int, int, int, int, @Nullable byte[], int, int);
+    method public int controlTransfer(int, int, int, int, @Nullable byte[], int, int, int);
     method public int getFileDescriptor();
     method public byte[] getRawDescriptors();
     method public String getSerial();
diff --git a/core/java/android/hardware/usb/UsbDeviceConnection.java b/core/java/android/hardware/usb/UsbDeviceConnection.java
index 7c2e518b8544..44144d92f56a 100644
--- a/core/java/android/hardware/usb/UsbDeviceConnection.java
+++ b/core/java/android/hardware/usb/UsbDeviceConnection.java
@@ -238,7 +238,7 @@ public class UsbDeviceConnection {
      * or negative value for failure
      */
     public int controlTransfer(int requestType, int request, int value,
-            int index, byte[] buffer, int length, int timeout) {
+            int index, @Nullable byte[] buffer, int length, int timeout) {
         return controlTransfer(requestType, request, value, index, buffer, 0, length, timeout);
     }
 
@@ -263,7 +263,7 @@ public class UsbDeviceConnection {
      * or negative value for failure
      */
     public int controlTransfer(int requestType, int request, int value, int index,
-            byte[] buffer, int offset, int length, int timeout) {
+            @Nullable byte[] buffer, int offset, int length, int timeout) {
         checkBounds(buffer, offset, length);
         return native_control_request(requestType, request, value, index,
                 buffer, offset, length, timeout);