ActivityTransitionState.java revision bdc4d8dc9635064fd67f379c341b69bdc03f8968
1/* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16package android.app; 17 18import android.os.Bundle; 19import android.os.ResultReceiver; 20import android.transition.Transition; 21import android.util.SparseArray; 22import android.view.View; 23import android.view.ViewGroup; 24import android.view.ViewTreeObserver; 25import android.view.Window; 26 27import java.lang.ref.WeakReference; 28import java.util.ArrayList; 29 30/** 31 * This class contains all persistence-related functionality for Activity Transitions. 32 * Activities start exit and enter Activity Transitions through this class. 33 */ 34class ActivityTransitionState { 35 36 private static final String ENTERING_SHARED_ELEMENTS = "android:enteringSharedElements"; 37 38 private static final String EXITING_MAPPED_FROM = "android:exitingMappedFrom"; 39 40 private static final String EXITING_MAPPED_TO = "android:exitingMappedTo"; 41 42 /** 43 * The shared elements that the calling Activity has said that they transferred to this 44 * Activity. 45 */ 46 private ArrayList<String> mEnteringNames; 47 48 /** 49 * The names of shared elements that were shared to the called Activity. 50 */ 51 private ArrayList<String> mExitingFrom; 52 53 /** 54 * The names of local Views that were shared out, mapped to those elements in mExitingFrom. 55 */ 56 private ArrayList<String> mExitingTo; 57 58 /** 59 * The local Views that were shared out, mapped to those elements in mExitingFrom. 60 */ 61 private ArrayList<View> mExitingToView; 62 63 /** 64 * The ExitTransitionCoordinator used to start an Activity. Used to make the elements restore 65 * Visibility of exited Views. 66 */ 67 private ExitTransitionCoordinator mCalledExitCoordinator; 68 69 /** 70 * The ExitTransitionCoordinator used to return to a previous Activity when called with 71 * {@link android.app.Activity#finishAfterTransition()}. 72 */ 73 private ExitTransitionCoordinator mReturnExitCoordinator; 74 75 /** 76 * We must be able to cancel entering transitions to stop changing the Window to 77 * opaque when we exit before making the Window opaque. 78 */ 79 private EnterTransitionCoordinator mEnterTransitionCoordinator; 80 81 /** 82 * ActivityOptions used on entering this Activity. 83 */ 84 private ActivityOptions mEnterActivityOptions; 85 86 /** 87 * Has an exit transition been started? If so, we don't want to double-exit. 88 */ 89 private boolean mHasExited; 90 91 /** 92 * Postpone painting and starting the enter transition until this is false. 93 */ 94 private boolean mIsEnterPostponed; 95 96 /** 97 * Potential exit transition coordinators. 98 */ 99 private SparseArray<WeakReference<ExitTransitionCoordinator>> mExitTransitionCoordinators; 100 101 /** 102 * Next key for mExitTransitionCoordinator. 103 */ 104 private int mExitTransitionCoordinatorsKey = 1; 105 106 private boolean mIsEnterTriggered; 107 108 public ActivityTransitionState() { 109 } 110 111 public int addExitTransitionCoordinator(ExitTransitionCoordinator exitTransitionCoordinator) { 112 if (mExitTransitionCoordinators == null) { 113 mExitTransitionCoordinators = 114 new SparseArray<WeakReference<ExitTransitionCoordinator>>(); 115 } 116 WeakReference<ExitTransitionCoordinator> ref = new WeakReference(exitTransitionCoordinator); 117 // clean up old references: 118 for (int i = mExitTransitionCoordinators.size() - 1; i >= 0; i--) { 119 WeakReference<ExitTransitionCoordinator> oldRef 120 = mExitTransitionCoordinators.valueAt(i); 121 if (oldRef.get() == null) { 122 mExitTransitionCoordinators.removeAt(i); 123 } 124 } 125 int newKey = mExitTransitionCoordinatorsKey++; 126 mExitTransitionCoordinators.append(newKey, ref); 127 return newKey; 128 } 129 130 public void readState(Bundle bundle) { 131 if (bundle != null) { 132 if (mEnterTransitionCoordinator == null || mEnterTransitionCoordinator.isReturning()) { 133 mEnteringNames = bundle.getStringArrayList(ENTERING_SHARED_ELEMENTS); 134 } 135 if (mEnterTransitionCoordinator == null) { 136 mExitingFrom = bundle.getStringArrayList(EXITING_MAPPED_FROM); 137 mExitingTo = bundle.getStringArrayList(EXITING_MAPPED_TO); 138 } 139 } 140 } 141 142 public void saveState(Bundle bundle) { 143 if (mEnteringNames != null) { 144 bundle.putStringArrayList(ENTERING_SHARED_ELEMENTS, mEnteringNames); 145 } 146 if (mExitingFrom != null) { 147 bundle.putStringArrayList(EXITING_MAPPED_FROM, mExitingFrom); 148 bundle.putStringArrayList(EXITING_MAPPED_TO, mExitingTo); 149 } 150 } 151 152 public void setEnterActivityOptions(Activity activity, ActivityOptions options) { 153 final Window window = activity.getWindow(); 154 if (window == null) { 155 return; 156 } 157 // ensure Decor View has been created so that the window features are activated 158 window.getDecorView(); 159 if (window.hasFeature(Window.FEATURE_ACTIVITY_TRANSITIONS) 160 && options != null && mEnterActivityOptions == null 161 && mEnterTransitionCoordinator == null 162 && options.getAnimationType() == ActivityOptions.ANIM_SCENE_TRANSITION) { 163 mEnterActivityOptions = options; 164 mIsEnterTriggered = false; 165 if (mEnterActivityOptions.isReturning()) { 166 restoreExitedViews(); 167 int result = mEnterActivityOptions.getResultCode(); 168 if (result != 0) { 169 activity.onActivityReenter(result, mEnterActivityOptions.getResultData()); 170 } 171 } 172 } 173 } 174 175 public void enterReady(Activity activity) { 176 if (mEnterActivityOptions == null || mIsEnterTriggered) { 177 return; 178 } 179 mIsEnterTriggered = true; 180 mHasExited = false; 181 ArrayList<String> sharedElementNames = mEnterActivityOptions.getSharedElementNames(); 182 ResultReceiver resultReceiver = mEnterActivityOptions.getResultReceiver(); 183 if (mEnterActivityOptions.isReturning()) { 184 restoreExitedViews(); 185 activity.getWindow().getDecorView().setVisibility(View.VISIBLE); 186 } 187 mEnterTransitionCoordinator = new EnterTransitionCoordinator(activity, 188 resultReceiver, sharedElementNames, mEnterActivityOptions.isReturning()); 189 190 if (!mIsEnterPostponed) { 191 startEnter(); 192 } 193 } 194 195 public void postponeEnterTransition() { 196 mIsEnterPostponed = true; 197 } 198 199 public void startPostponedEnterTransition() { 200 if (mIsEnterPostponed) { 201 mIsEnterPostponed = false; 202 if (mEnterTransitionCoordinator != null) { 203 startEnter(); 204 } 205 } 206 } 207 208 private void startEnter() { 209 if (mEnterTransitionCoordinator.isReturning()) { 210 if (mExitingToView != null) { 211 mEnterTransitionCoordinator.viewInstancesReady(mExitingFrom, mExitingTo, 212 mExitingToView); 213 } else { 214 mEnterTransitionCoordinator.namedViewsReady(mExitingFrom, mExitingTo); 215 } 216 } else { 217 mEnterTransitionCoordinator.namedViewsReady(null, null); 218 mEnteringNames = mEnterTransitionCoordinator.getAllSharedElementNames(); 219 } 220 221 mExitingFrom = null; 222 mExitingTo = null; 223 mExitingToView = null; 224 mEnterActivityOptions = null; 225 } 226 227 public void onStop() { 228 restoreExitedViews(); 229 if (mEnterTransitionCoordinator != null) { 230 mEnterTransitionCoordinator.stop(); 231 mEnterTransitionCoordinator = null; 232 } 233 if (mReturnExitCoordinator != null) { 234 mReturnExitCoordinator.stop(); 235 mReturnExitCoordinator = null; 236 } 237 } 238 239 public void onResume(Activity activity, boolean isTopOfTask) { 240 // After orientation change, the onResume can come in before the top Activity has 241 // left, so if the Activity is not top, wait a second for the top Activity to exit. 242 if (mCalledExitCoordinator == null) { 243 return; // This is the called activity 244 } 245 if (isTopOfTask || mEnterTransitionCoordinator == null) { 246 restoreExitedViews(); 247 restoreReenteringViews(); 248 } else { 249 activity.mHandler.postDelayed(new Runnable() { 250 @Override 251 public void run() { 252 if (mEnterTransitionCoordinator == null || 253 mEnterTransitionCoordinator.isWaitingForRemoteExit()) { 254 restoreExitedViews(); 255 restoreReenteringViews(); 256 } 257 } 258 }, 1000); 259 } 260 } 261 262 public void clear() { 263 mEnteringNames = null; 264 mExitingFrom = null; 265 mExitingTo = null; 266 mExitingToView = null; 267 mCalledExitCoordinator = null; 268 mEnterTransitionCoordinator = null; 269 mEnterActivityOptions = null; 270 mExitTransitionCoordinators = null; 271 } 272 273 private void restoreExitedViews() { 274 if (mCalledExitCoordinator != null) { 275 mCalledExitCoordinator.resetViews(); 276 mCalledExitCoordinator = null; 277 } 278 } 279 280 private void restoreReenteringViews() { 281 if (mEnterTransitionCoordinator != null && mEnterTransitionCoordinator.isReturning()) { 282 mEnterTransitionCoordinator.forceViewsToAppear(); 283 mExitingFrom = null; 284 mExitingTo = null; 285 mExitingToView = null; 286 } 287 } 288 289 public boolean startExitBackTransition(final Activity activity) { 290 if (mEnteringNames == null) { 291 return false; 292 } else { 293 if (!mHasExited) { 294 mHasExited = true; 295 Transition enterViewsTransition = null; 296 ViewGroup decor = null; 297 boolean delayExitBack = false; 298 if (mEnterTransitionCoordinator != null) { 299 enterViewsTransition = mEnterTransitionCoordinator.getEnterViewsTransition(); 300 decor = mEnterTransitionCoordinator.getDecor(); 301 delayExitBack = mEnterTransitionCoordinator.cancelEnter(); 302 mEnterTransitionCoordinator = null; 303 if (enterViewsTransition != null && decor != null) { 304 enterViewsTransition.pause(decor); 305 } 306 } 307 308 mReturnExitCoordinator = 309 new ExitTransitionCoordinator(activity, mEnteringNames, null, null, true); 310 if (enterViewsTransition != null && decor != null) { 311 enterViewsTransition.resume(decor); 312 } 313 if (delayExitBack && decor != null) { 314 final ViewGroup finalDecor = decor; 315 decor.getViewTreeObserver().addOnPreDrawListener( 316 new ViewTreeObserver.OnPreDrawListener() { 317 @Override 318 public boolean onPreDraw() { 319 finalDecor.getViewTreeObserver().removeOnPreDrawListener(this); 320 if (mReturnExitCoordinator != null) { 321 mReturnExitCoordinator.startExit(activity.mResultCode, 322 activity.mResultData); 323 } 324 return true; 325 } 326 }); 327 } else { 328 mReturnExitCoordinator.startExit(activity.mResultCode, activity.mResultData); 329 } 330 } 331 return true; 332 } 333 } 334 335 public void startExitOutTransition(Activity activity, Bundle options) { 336 if (!activity.getWindow().hasFeature(Window.FEATURE_ACTIVITY_TRANSITIONS)) { 337 return; 338 } 339 ActivityOptions activityOptions = new ActivityOptions(options); 340 mEnterTransitionCoordinator = null; 341 if (activityOptions.getAnimationType() == ActivityOptions.ANIM_SCENE_TRANSITION) { 342 int key = activityOptions.getExitCoordinatorKey(); 343 int index = mExitTransitionCoordinators.indexOfKey(key); 344 if (index >= 0) { 345 mCalledExitCoordinator = mExitTransitionCoordinators.valueAt(index).get(); 346 mExitTransitionCoordinators.removeAt(index); 347 if (mCalledExitCoordinator != null) { 348 mExitingFrom = mCalledExitCoordinator.getAcceptedNames(); 349 mExitingTo = mCalledExitCoordinator.getMappedNames(); 350 mExitingToView = mCalledExitCoordinator.copyMappedViews(); 351 mCalledExitCoordinator.startExit(); 352 } 353 } 354 } 355 } 356} 357