Add support for secure views.

Added the MotionEvent.FLAG_WINDOW_IS_OBSCURED flag which is set by the
input manager whenever another visible window is partly or wholly obscured
the target of a touch event so that applications can filter touches
accordingly.

Added a "filterTouchesWhenObscured" attribute to View which can be used to
enable filtering of touches when the view's window is obscured.

Change-Id: I936d9c85013fd2d77fb296a600528d30a29027d2

2 files changed, 23 insertions, 0 deletions

diff --git a/native/android/input.cpp b/native/android/input.cpp
index c79f913..57f0072 100644
--- a/native/android/input.cpp
+++ b/native/android/input.cpp
@@ -84,6 +84,10 @@ int32_t AMotionEvent_getAction(const AInputEvent* motion_event) {
     return static_cast<const MotionEvent*>(motion_event)->getAction();
 }
 
+int32_t AMotionEvent_getFlags(const AInputEvent* motion_event) {
+    return static_cast<const MotionEvent*>(motion_event)->getFlags();
+}
+
 int32_t AMotionEvent_getMetaState(const AInputEvent* motion_event) {
     return static_cast<const MotionEvent*>(motion_event)->getMetaState();
 }
diff --git a/native/include/android/input.h b/native/include/android/input.h
index 5b62da4..9da122b 100644
--- a/native/include/android/input.h
+++ b/native/include/android/input.h
@@ -247,6 +247,22 @@ enum {
 };
 
 /*
+ * Motion event flags.
+ */
+enum {
+    /* This flag indicates that the window that received this motion event is partly
+     * or wholly obscured by another visible window above it.  This flag is set to true
+     * even if the event did not directly pass through the obscured area.
+     * A security sensitive application can check this flag to identify situations in which
+     * a malicious application may have covered up part of its content for the purpose
+     * of misleading the user or hijacking touches.  An appropriate response might be
+     * to drop the suspect touches or to take additional precautions to confirm the user's
+     * actual intent.
+     */
+    AMOTION_EVENT_FLAG_WINDOW_IS_OBSCURED = 0x1,
+};
+
+/*
  * Motion event edge touch flags.
  */
 enum {
@@ -395,6 +411,9 @@ int64_t AKeyEvent_getEventTime(const AInputEvent* key_event);
 /* Get the combined motion event action code and pointer index. */
 int32_t AMotionEvent_getAction(const AInputEvent* motion_event);
 
+/* Get the motion event flags. */
+int32_t AMotionEvent_getFlags(const AInputEvent* motion_event);
+
 /* Get the state of any meta / modifier keys that were in effect when the
  * event was generated. */
 int32_t AMotionEvent_getMetaState(const AInputEvent* motion_event);