1 files changed, 29 insertions, 0 deletions
diff --git a/core/java/android/view/InputDevice.java b/core/java/android/view/InputDevice.java
index f39d1f5..cc4598d 100644
--- a/core/java/android/view/InputDevice.java
+++ b/core/java/android/view/InputDevice.java
@@ -201,6 +201,35 @@ public final class InputDevice implements Parcelable {
     public static final int SOURCE_STYLUS = 0x00004000 | SOURCE_CLASS_POINTER;
 
     /**
+     * The input device is a Bluetooth stylus.
+     * <p>
+     * Note that this bit merely indicates that an input device is capable of
+     * obtaining input from a Bluetooth stylus.  To determine whether a given
+     * touch event was produced by a stylus, examine the tool type returned by
+     * {@link MotionEvent#getToolType(int)} for each individual pointer.
+     * </p><p>
+     * A single touch event may multiple pointers with different tool types,
+     * such as an event that has one pointer with tool type
+     * {@link MotionEvent#TOOL_TYPE_FINGER} and another pointer with tool type
+     * {@link MotionEvent#TOOL_TYPE_STYLUS}.  So it is important to examine
+     * the tool type of each pointer, regardless of the source reported
+     * by {@link MotionEvent#getSource()}.
+     * </p><p>
+     * A bluetooth stylus generally receives its pressure and button state
+     * information from the stylus itself, and derives the rest from another
+     * source. For example, a Bluetooth stylus used in conjunction with a
+     * touchscreen would derive its contact position and pointer size from the
+     * touchscreen and may not be any more accurate than other tools such as
+     * fingers.
+     * </p>
+     *
+     * @see #SOURCE_STYLUS
+     * @see #SOURCE_CLASS_POINTER
+     */
+    public static final int SOURCE_BLUETOOTH_STYLUS =
+            0x00008000 | SOURCE_STYLUS;
+
+    /**
      * The input source is a trackball.
      *
      * @see #SOURCE_CLASS_TRACKBALL