Activity starting window and how to speed up activity starting (Android 7.0)

A starting preview window is shown during activity starting. The feature is implemented in ActivityStack.startActivityLocked method.

Inframeworks/base/services/core/java/com/android/server/am/ActivityStack.java

2690    final void startActivityLocked(ActivityRecord r, boolean newTask, boolean keepCurTransition,2691            ActivityOptions options) {...............................2756        if (!isHomeStack() || numActivities() > 0) {2757            // We want to show the starting preview window if we are2758            // switching to a new task, or the next activity's process is2759            // not currently running....................................2797            if (r.mLaunchTaskBehind) {2798                // Don't do a starting window for mLaunchTaskBehind. More importantly make sure we2799                // tell WindowManager that r is visible even though it is at the back of the stack.2800                mWindowManager.setAppVisibility(r.appToken, true);2801                ensureActivitiesVisibleLocked(null, 0, !PRESERVE_WINDOWS);2802            } else if (SHOW_APP_STARTING_PREVIEW && doShow) {     //  SHOW_APP_STARTING_PREVIEW is true by default2803                // Figure out if we are transitioning from another activity that is2804                // "has the same starting icon" as the next one.  This allows the2805                // window manager to keep the previous window it had previously2806                // created, if it still had one.2807                ActivityRecord prev = r.task.topRunningActivityWithStartingWindowLocked();2808                if (prev != null) {2809                    // We don't want to reuse the previous starting preview if:2810                    // (1) The current activity is in a different task.2811                    if (prev.task != r.task) {2812                        prev = null;2813                    }2814                    // (2) The current activity is already displayed.2815                    else if (prev.nowVisible) {2816                        prev = null;2817                    }2818                }2819                r.showStartingWindow(prev, showStartingIcon);2820                VendorActivityStackCallback.callOnAppStartingPreview(mVendorCallbacks, r.intent, mService.mContext);2821            }.........................2832    }

Inframeworks/base/services/core/java/com/android/server/am/ActivityRecord.java

1418    void showStartingWindow(ActivityRecord prev, boolean createIfNeeded) {1419        final CompatibilityInfo compatInfo =1420                service.compatibilityInfoForPackageLocked(info.applicationInfo);1421        final boolean shown = service.mWindowManager.setAppStartingWindow(1422                appToken, packageName, theme, compatInfo, nonLocalizedLabel, labelRes, icon,1423                logo, windowFlags, prev != null ? prev.appToken : null, createIfNeeded);1424        if (shown) {1425            mStartingWindowState = STARTING_WINDOW_SHOWN;1426        }1427    }

Inframeworks/base/services/core/java/com/android/server/wm/WindowManagerService.java

4201    public boolean setAppStartingWindow(IBinder token, String pkg,4202            int theme, CompatibilityInfo compatInfo,4203            CharSequence nonLocalizedLabel, int labelRes, int icon, int logo,4204            int windowFlags, IBinder transferFrom, boolean createIfNeeded) {42094210        synchronized(mWindowMap) {.................................42314232            // If this is a translucent window, then don't4233            // show a starting window -- the current effect (a full-screen4234            // opaque starting window that fades away to the real contents4235            // when it is ready) does not work for this.4238            if (theme != 0) {4239                AttributeCache.Entry ent = AttributeCache.instance().get(pkg, theme,4240                        com.android.internal.R.styleable.Window, mCurrentUserId);4241                if (ent == null) {4242                    // Whoops!  App doesn't exist.  Um.  Okay.  We'll just4243                    // pretend like we didn't see that.4244                    return false;4245                }4246                final boolean windowIsTranslucent = ent.array.getBoolean(4247                        com.android.internal.R.styleable.Window_windowIsTranslucent, false);4248                final boolean windowIsFloating = ent.array.getBoolean(4249                        com.android.internal.R.styleable.Window_windowIsFloating, false);4250                final boolean windowShowWallpaper = ent.array.getBoolean(4251                        com.android.internal.R.styleable.Window_windowShowWallpaper, false);4252                final boolean windowDisableStarting = ent.array.getBoolean(4253                        com.android.internal.R.styleable.Window_windowDisablePreview, false);4254                if (DEBUG_STARTING_WINDOW) Slog.v(TAG_WM, "Translucent=" + windowIsTranslucent4255                        + " Floating=" + windowIsFloating4256                        + " ShowWallpaper=" + windowShowWallpaper);4257                if (windowIsTranslucent) {4258                    return false;4259                }4260                if (windowIsFloating || windowDisableStarting) {4261                    return false;4262                }4263                if (windowShowWallpaper) {4264                    if (mWallpaperControllerLocked.getWallpaperTarget() == null) {4265                        // If this theme is requesting a wallpaper, and the wallpaper4266                        // is not currently visible, then this effectively serves as4267                        // an opaque window and our starting window transition animation4268                        // can still work.  We just need to make sure the starting window4269                        // is also showing the wallpaper.4270                        windowFlags |= FLAG_SHOW_WALLPAPER;4271                    } else {4272                        return false;4273                    }4274                }4275            }...........................4287            if (DEBUG_STARTING_WINDOW) Slog.v(TAG_WM, "Creating StartingData");4288            wtoken.startingData = new StartingData(pkg, theme, compatInfo, nonLocalizedLabel,4289                    labelRes, icon, logo, windowFlags);4290            Message m = mH.obtainMessage(H.ADD_STARTING, wtoken);4291            // Note: we really want to do sendMessageAtFrontOfQueue() because we4292            // want to process the message ASAP, before any other queued4293            // messages.4295            mH.sendMessageAtFrontOfQueue(m);4296        }4297        return true;4298    }

8382                case ADD_STARTING: {8395                    try {8396                        final Configuration overrideConfig = wtoken != null && wtoken.mTask != null8397                                ? wtoken.mTask.mOverrideConfig : null;8398                        view = mPolicy.addStartingWindow(wtoken.token, sd.pkg, sd.theme,8399                            sd.compatInfo, sd.nonLocalizedLabel, sd.labelRes, sd.icon, sd.logo,8400                            sd.windowFlags, overrideConfig);8401                    } catch (Exception e) {8402                        Slog.w(TAG_WM, "Exception when adding starting window", e);8403                    }84048439                } break;

In frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java

static final boolean SHOW_STARTING_ANIMATIONS = true;  // decide if we need show starting window

2190    public View addStartingWindow(IBinder appToken, String packageName, int theme,2191            CompatibilityInfo compatInfo, CharSequence nonLocalizedLabel, int labelRes,2192            int icon, int logo, int windowFlags) {// we can add a callback function here to skip adding starting window to WM2193        if (!SHOW_STARTING_ANIMATIONS || VendorPhoneWindowManagerCallback.callSkipAddStartingWindow(mVendorCallbacks)) { 2194            return null;2195        }22022203        try {...........................2217            Window win = PolicyManager.makeNewWindow(context);2218            final TypedArray ta = win.getWindowStyle();22192220            // performance_improve begin, skip starting window of some application to optimize performance.2221            if (!packageName.equals(FIRE_LAUNCHER_PACKAGE) && (2222                    ta.getBoolean(2223                            com.android.internal.R.styleable.Window_windowDisablePreview, false)2224                    || ta.getBoolean(2225                            com.android.internal.R.styleable.Window_windowShowWallpaper,false))2226                ) {2227                return null;2228            }2229            // performance_improve end22302231            Resources r = context.getResources();2232            win.setTitle(r.getText(labelRes, nonLocalizedLabel));22332234            win.setType(2235                WindowManager.LayoutParams.TYPE_APPLICATION_STARTING);2236            // Force the window flags: this is a fake window, so it is not really2237            // touchable or focusable by the user.  We also add in the ALT_FOCUSABLE_IM2238            // flag because we do know that the next window will take input2239            // focus, so we want to get the IME window up on top of us right away.2240            win.setFlags(2241                windowFlags|2242                WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE|2243                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE|2244                WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM,2245                windowFlags|2246                WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE|2247                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE|2248                WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM);22492250            win.setDefaultIcon(icon);2251            win.setDefaultLogo(logo);22522253            win.setLayout(WindowManager.LayoutParams.MATCH_PARENT,2254                    WindowManager.LayoutParams.MATCH_PARENT);22552256            final WindowManager.LayoutParams params = win.getAttributes();2257            params.token = appToken;2258            params.packageName = packageName;2259            params.windowAnimations = win.getWindowStyle().getResourceId(2260                    com.android.internal.R.styleable.Window_windowAnimationStyle, 0);2261            params.privateFlags |=2262                    WindowManager.LayoutParams.PRIVATE_FLAG_FAKE_HARDWARE_ACCELERATED;2263            params.privateFlags |= WindowManager.LayoutParams.PRIVATE_FLAG_SHOW_FOR_ALL_USERS;22642265            if (!compatInfo.supportsScreen()) {2266                params.privateFlags |= WindowManager.LayoutParams.PRIVATE_FLAG_COMPATIBLE_WINDOW;2267            }22682269            params.setTitle("Starting " + packageName);22702271            wm = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);2272            view = win.getDecorView();22732274            if (win.isFloating()) {2275                // Whoops, there is no way to display an animation/preview2276                // of such a thing!  After all that work...  let's skip it.2277                // (Note that we must do this here because it is in2278                // getDecorView() where the theme is evaluated...  maybe2279                // we should peek the floating attribute from the theme2280                // earlier.)2281                return null;2282            }228322882289            // fosmod_vendor_callbacks begin2290            Rect contentRect;2291            if ((windowFlags & FLAG_FULLSCREEN) != 0) {2292                contentRect = new Rect(mStableFullscreenLeft, mStableFullscreenTop,2293                    mStableFullscreenRight, mStableFullscreenBottom);2294            } else {2295                contentRect = new Rect(mStableLeft, mStableTop,2296                    mStableRight, mStableBottom);2297            }2298            VendorPhoneWindowManagerCallback.callAddCustomStartingWindow(   // a custom callback to add customized starting window instead of original one.2299                mVendorCallbacks,2300                view,2301                context,2302                packageName,2303                mOrientationListener.getProposedRotation(),2304                contentRect,2305                new Rect(2306                    mRestrictedScreenLeft,2307                    mRestrictedScreenTop,2308                    mRestrictedScreenLeft + mRestrictedScreenWidth,2309                    mRestrictedScreenTop + mRestrictedOverscanScreenHeight2310                )2311            );2312            // fosmod_vendor_callbacks end23132314            wm.addView(view, params);23152316            // Only return the view if it was successfully added to the2317            // window manager... which we can tell by it having a parent.2318            return view.getParent() != null ? view : null;

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