Add a minimum timeout for double-tap in GestureDetector

Prevent noisy falsing. Minimum timeout is currently 40ms and can be
tuned for later. Consider un-hiding the ViewConfiguration query method
later.

Bug 10476944

Change-Id: Ib470735ec929b0b358fca4597e92dc81084e675f

1 files changed, 3 insertions, 2 deletions

diff --git a/core/java/android/view/GestureDetector.java b/core/java/android/view/GestureDetector.java
index 6bbfe0f..2351548 100644
--- a/core/java/android/view/GestureDetector.java
+++ b/core/java/android/view/GestureDetector.java
@@ -17,7 +17,6 @@
 package android.view;
 
 import android.content.Context;
-import android.os.Build;
 import android.os.Handler;
 import android.os.Message;
 
@@ -202,6 +201,7 @@ public class GestureDetector {
     private static final int LONGPRESS_TIMEOUT = ViewConfiguration.getLongPressTimeout();
     private static final int TAP_TIMEOUT = ViewConfiguration.getTapTimeout();
     private static final int DOUBLE_TAP_TIMEOUT = ViewConfiguration.getDoubleTapTimeout();
+    private static final int DOUBLE_TAP_MIN_TIME = ViewConfiguration.getDoubleTapMinTime();
 
     // constants for Message.what used by GestureHandler below
     private static final int SHOW_PRESS = 1;
@@ -673,7 +673,8 @@ public class GestureDetector {
             return false;
         }
 
-        if (secondDown.getEventTime() - firstUp.getEventTime() > DOUBLE_TAP_TIMEOUT) {
+        final long deltaTime = secondDown.getEventTime() - firstUp.getEventTime();
+        if (deltaTime > DOUBLE_TAP_TIMEOUT || deltaTime < DOUBLE_TAP_MIN_TIME) {
             return false;
         }