1 files changed, 15 insertions, 0 deletions
diff --git a/packages/Keyguard/src/com/android/keyguard/KeyguardUpdateMonitorCallback.java b/packages/Keyguard/src/com/android/keyguard/KeyguardUpdateMonitorCallback.java
index 76f9637..c08880d 100644
--- a/packages/Keyguard/src/com/android/keyguard/KeyguardUpdateMonitorCallback.java
+++ b/packages/Keyguard/src/com/android/keyguard/KeyguardUpdateMonitorCallback.java
@@ -19,6 +19,7 @@ import android.app.PendingIntent;
 import android.app.admin.DevicePolicyManager;
 import android.graphics.Bitmap;
 import android.media.AudioManager;
+import android.os.SystemClock;
 import android.view.WindowManagerPolicy;
 
 import com.android.internal.telephony.IccCardConstants;
@@ -27,6 +28,11 @@ import com.android.internal.telephony.IccCardConstants;
  * Callback for general information relevant to lock screen.
  */
 class KeyguardUpdateMonitorCallback {
+
+    private static final long VISIBILITY_CHANGED_COLLAPSE_MS = 1000;
+    private long mVisibilityChangedCalled;
+    private boolean mShowing;
+
     /**
      * Called when the battery status changes, e.g. when plugged in or unplugged, charge
      * level, etc. changes.
@@ -70,6 +76,15 @@ class KeyguardUpdateMonitorCallback {
      */
     void onKeyguardVisibilityChanged(boolean showing) { }
 
+    void onKeyguardVisibilityChangedRaw(boolean showing) {
+        final long now = SystemClock.elapsedRealtime();
+        if (showing == mShowing
+                && (now - mVisibilityChangedCalled) < VISIBILITY_CHANGED_COLLAPSE_MS) return;
+        onKeyguardVisibilityChanged(showing);
+        mVisibilityChangedCalled = now;
+        mShowing = showing;
+    }
+
     /**
      * Called when visibility of lockscreen clock changes, such as when
      * obscured by a widget.