Implement nice transitions for light status bar
- When the flag changes, apply an animation from the current value
- When the flag change is caused by an app transition, synchronize
the status bar animation with the app transition animation.
PhoneWindowManager calculates the timings based on some heuristics
of the app transition animations and supplies these timings to
StatusBarService.
Bug: 19233606
Change-Id: I4f99afba8f1eebb3524699ed4d7fbafee5463a37
diff --git a/services/core/java/com/android/server/policy/StatusBarController.java b/services/core/java/com/android/server/policy/StatusBarController.java
new file mode 100644
index 0000000..4d4ab44
--- /dev/null
+++ b/services/core/java/com/android/server/policy/StatusBarController.java
@@ -0,0 +1,187 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+package com.android.server.policy;
+
+import android.app.StatusBarManager;
+import android.os.IBinder;
+import android.os.RemoteException;
+import android.os.SystemClock;
+import android.util.Slog;
+import android.view.View;
+import android.view.WindowManager;
+import android.view.WindowManagerInternal;
+import android.view.animation.Animation;
+import android.view.animation.AnimationSet;
+import android.view.animation.Interpolator;
+import android.view.animation.TranslateAnimation;
+
+import com.android.internal.statusbar.IStatusBarService;
+
+import static android.view.WindowManagerInternal.*;
+
+/**
+ * Implements status bar specific behavior.
+ */
+public class StatusBarController extends BarController {
+
+ private static final long TRANSITION_DURATION = 120L;
+
+ private final AppTransitionListener mAppTransitionListener
+ = new AppTransitionListener() {
+
+ @Override
+ public void onAppTransitionPendingLocked() {
+ mHandler.post(new Runnable() {
+ @Override
+ public void run() {
+ try {
+ IStatusBarService statusbar = getStatusBarService();
+ if (statusbar != null) {
+ statusbar.appTransitionPending();
+ }
+ } catch (RemoteException e) {
+ Slog.e(mTag, "RemoteException when app transition is pending", e);
+ // re-acquire status bar service next time it is needed.
+ mStatusBarService = null;
+ }
+ }
+ });
+ }
+
+ @Override
+ public void onAppTransitionStartingLocked(IBinder openToken, IBinder closeToken,
+ final Animation openAnimation, final Animation closeAnimation) {
+ mHandler.post(new Runnable() {
+ @Override
+ public void run() {
+ try {
+ IStatusBarService statusbar = getStatusBarService();
+ if (statusbar != null) {
+ long startTime = calculateStatusBarTransitionStartTime(openAnimation,
+ closeAnimation);
+ statusbar.appTransitionStarting(startTime, TRANSITION_DURATION);
+ }
+ } catch (RemoteException e) {
+ Slog.e(mTag, "RemoteException when app transition is starting", e);
+ // re-acquire status bar service next time it is needed.
+ mStatusBarService = null;
+ }
+ }
+ });
+ }
+
+ @Override
+ public void onAppTransitionCancelledLocked() {
+ mHandler.post(new Runnable() {
+ @Override
+ public void run() {
+ try {
+ IStatusBarService statusbar = getStatusBarService();
+ if (statusbar != null) {
+ statusbar.appTransitionCancelled();
+ }
+ } catch (RemoteException e) {
+ Slog.e(mTag, "RemoteException when app transition is cancelled", e);
+ // re-acquire status bar service next time it is needed.
+ mStatusBarService = null;
+ }
+ }
+ });
+ }
+ };
+
+ public StatusBarController() {
+ super("StatusBar",
+ View.STATUS_BAR_TRANSIENT,
+ View.STATUS_BAR_UNHIDE,
+ View.STATUS_BAR_TRANSLUCENT,
+ StatusBarManager.WINDOW_STATUS_BAR,
+ WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
+ }
+
+ public AppTransitionListener getAppTransitionListener() {
+ return mAppTransitionListener;
+ }
+
+ /**
+ * For a given app transition with {@code openAnimation} and {@code closeAnimation}, this
+ * calculates the timings for the corresponding status bar transition.
+ *
+ * @return the desired start time of the status bar transition, in uptime millis
+ */
+ private long calculateStatusBarTransitionStartTime(Animation openAnimation,
+ Animation closeAnimation) {
+ if (openAnimation != null && closeAnimation != null) {
+ TranslateAnimation openTranslateAnimation = findTranslateAnimation(openAnimation);
+ TranslateAnimation closeTranslateAnimation = findTranslateAnimation(closeAnimation);
+ if (openTranslateAnimation != null) {
+
+ // Some interpolators are extremely quickly mostly finished, but not completely. For
+ // our purposes, we need to find the fraction for which ther interpolator is mostly
+ // there, and use that value for the calculation.
+ float t = findAlmostThereFraction(openTranslateAnimation.getInterpolator());
+ return SystemClock.uptimeMillis()
+ + openTranslateAnimation.getStartOffset()
+ + (long)(openTranslateAnimation.getDuration()*t) - TRANSITION_DURATION;
+ } else if (closeTranslateAnimation != null) {
+ return SystemClock.uptimeMillis();
+ } else {
+ return SystemClock.uptimeMillis();
+ }
+ } else {
+ return SystemClock.uptimeMillis();
+ }
+ }
+
+ /**
+ * Tries to find a {@link TranslateAnimation} inside the {@code animation}.
+ *
+ * @return the found animation, {@code null} otherwise
+ */
+ private TranslateAnimation findTranslateAnimation(Animation animation) {
+ if (animation instanceof TranslateAnimation) {
+ return (TranslateAnimation) animation;
+ } else if (animation instanceof AnimationSet) {
+ AnimationSet set = (AnimationSet) animation;
+ for (int i = 0; i < set.getAnimations().size(); i++) {
+ Animation a = set.getAnimations().get(i);
+ if (a instanceof TranslateAnimation) {
+ return (TranslateAnimation) a;
+ }
+ }
+ }
+ return null;
+ }
+
+ /**
+ * Binary searches for a {@code t} such that there exists a {@code -0.01 < eps < 0.01} for which
+ * {@code interpolator(t + eps) > 0.99}.
+ */
+ private float findAlmostThereFraction(Interpolator interpolator) {
+ float val = 0.5f;
+ float adj = 0.25f;
+ while (adj >= 0.01f) {
+ if (interpolator.getInterpolation(val) < 0.99f) {
+ val += adj;
+ } else {
+ val -= adj;
+ }
+ adj /= 2;
+ }
+ return val;
+ }
+}