diff --git a/core/java/android/view/InputDevice.java b/core/java/android/view/InputDevice.java
index 2ea03604315d1..3bb9c01d3c3e7 100755
--- a/core/java/android/view/InputDevice.java
+++ b/core/java/android/view/InputDevice.java
@@ -458,6 +458,18 @@ public final class InputDevice implements Parcelable {
         return mIsExternal;
     }
 
+    /**
+     * Returns true if the device is a full keyboard.
+     *
+     * @return True if the device is a full keyboard.
+     *
+     * @hide
+     */
+    public boolean isFullKeyboard() {
+        return (mSources & SOURCE_KEYBOARD) == SOURCE_KEYBOARD
+                && mKeyboardType == KEYBOARD_TYPE_ALPHABETIC;
+    }
+
     /**
      * Gets the name of this input device.
      * @return The input device name.
diff --git a/services/java/com/android/server/input/InputManagerService.java b/services/java/com/android/server/input/InputManagerService.java
index d85facc619702..bdd0aa463e000 100644
--- a/services/java/com/android/server/input/InputManagerService.java
+++ b/services/java/com/android/server/input/InputManagerService.java
@@ -592,7 +592,7 @@ public class InputManagerService extends IInputManager.Stub implements Watchdog.
                 deviceIdAndGeneration[i * 2] = inputDevice.getId();
                 deviceIdAndGeneration[i * 2 + 1] = inputDevice.getGeneration();
 
-                if (isFullKeyboard(inputDevice)) {
+                if (!inputDevice.isVirtual() && inputDevice.isFullKeyboard()) {
                     if (!containsInputDeviceWithDescriptor(oldInputDevices,
                             inputDevice.getDescriptor())) {
                         mTempFullKeyboards.add(numFullKeyboardsAdded++, inputDevice);
@@ -695,12 +695,6 @@ public class InputManagerService extends IInputManager.Stub implements Watchdog.
         reloadKeyboardLayouts();
     }
 
-    private static boolean isFullKeyboard(InputDevice inputDevice) {
-        return !inputDevice.isVirtual()
-                && (inputDevice.getSources() & InputDevice.SOURCE_KEYBOARD) != 0
-                && inputDevice.getKeyboardType() == InputDevice.KEYBOARD_TYPE_ALPHABETIC;
-    }
-
     private static boolean containsInputDeviceWithDescriptor(InputDevice[] inputDevices,
             String descriptor) {
         final int numDevices = inputDevices.length;
diff --git a/services/java/com/android/server/wm/WindowManagerService.java b/services/java/com/android/server/wm/WindowManagerService.java
index 4ce8c97541d79..10919f2578699 100755
--- a/services/java/com/android/server/wm/WindowManagerService.java
+++ b/services/java/com/android/server/wm/WindowManagerService.java
@@ -6466,17 +6466,18 @@ public class WindowManagerService extends IWindowManager.Stub
                                     WindowManagerPolicy.PRESENCE_INTERNAL;
 
                     if (mIsTouchDevice) {
-                        if ((sources & InputDevice.SOURCE_TOUCHSCREEN) != 0) {
+                        if ((sources & InputDevice.SOURCE_TOUCHSCREEN) ==
+                                InputDevice.SOURCE_TOUCHSCREEN) {
                             config.touchscreen = Configuration.TOUCHSCREEN_FINGER;
                         }
                     } else {
                         config.touchscreen = Configuration.TOUCHSCREEN_NOTOUCH;
                     }
 
-                    if ((sources & InputDevice.SOURCE_TRACKBALL) != 0) {
+                    if ((sources & InputDevice.SOURCE_TRACKBALL) == InputDevice.SOURCE_TRACKBALL) {
                         config.navigation = Configuration.NAVIGATION_TRACKBALL;
                         navigationPresence |= presenceFlag;
-                    } else if ((sources & InputDevice.SOURCE_DPAD) != 0
+                    } else if ((sources & InputDevice.SOURCE_DPAD) == InputDevice.SOURCE_DPAD
                             && config.navigation == Configuration.NAVIGATION_NONAV) {
                         config.navigation = Configuration.NAVIGATION_DPAD;
                         navigationPresence |= presenceFlag;