Fix bug when Keyguard gets hidden.

We make sure in Keyguard that we only hide ourselves in
startKeyguardExitAnimation ourselves when we requested a hide.

In addition, this change also fixes a bug in WindowAnimator that
it should only call startKeyguardExitAnimation when Keyguard actually
requested a hide.

Bug: 15676717
Change-Id: I2279cccb9916985b7e9a2f41137878be5782cb9c

packages/SystemUI/src/com/android/systemui/keyguard/KeyguardViewMediator.java

@@ -238,6 +238,12 @@ public class KeyguardViewMediator extends SystemUI {
     // last known state of the cellular connection
     private String mPhoneState = TelephonyManager.EXTRA_STATE_IDLE;
 
+    /**
+     * Whether a hide is pending an we are just waiting for #startKeyguardExitAnimation to be
+     * called.
+     * */
+    private boolean mHiding;
+
     /**
      * we send this intent when the keyguard is dismissed.
      */
@@ -1169,6 +1175,7 @@ public class KeyguardViewMediator extends SystemUI {
             }
 
             mStatusBarKeyguardViewManager.show(options);
+            mHiding = false;
             mShowing = true;
             mKeyguardDonePending = false;
             updateActivityLockScreenState();
@@ -1191,7 +1198,7 @@ public class KeyguardViewMediator extends SystemUI {
         synchronized (KeyguardViewMediator.this) {
             if (DEBUG) Log.d(TAG, "handleHide");
             try {
-
+                mHiding = true;
                 if (mShowing) {
 
                     // Don't actually hide the Keyguard at the moment, wait for window manager until
@@ -1212,6 +1219,11 @@ public class KeyguardViewMediator extends SystemUI {
     private void handleStartKeyguardExitAnimation(long startTime, long fadeoutDuration) {
         synchronized (KeyguardViewMediator.this) {
 
+            if (!mHiding) {
+                return;
+            }
+            mHiding = false;
+
             // only play "unlock" noises if not on a call (since the incall UI
             // disables the keyguard)
             if (TelephonyManager.EXTRA_STATE_IDLE.equals(mPhoneState)) {

services/core/java/com/android/server/wm/WindowAnimator.java

@@ -391,7 +391,7 @@ public class WindowAnimator {
                     final WindowStateAnimator winAnimator = unForceHiding.get(i);
                     winAnimator.setAnimation(a);
                     winAnimator.mAnimationIsEntrance = true;
-                    if (startKeyguardExit) {
+                    if (startKeyguardExit && mKeyguardGoingAway) {
                         // Do one time only.
                         mPolicy.startKeyguardExitAnimation(mCurrentTime + a.getStartOffset(),
                                 a.getDuration());