Todd Kennedy | a5fc6f0 | 2015-04-14 18:22:54 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 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 | */ |
| 16 | |
| 17 | package android.app; |
| 18 | |
Svetoslav | 970b59c | 2015-06-09 16:05:21 -0700 | [diff] [blame] | 19 | import android.annotation.NonNull; |
Todd Kennedy | a5fc6f0 | 2015-04-14 18:22:54 -0700 | [diff] [blame] | 20 | import android.annotation.Nullable; |
Todd Kennedy | a5fc6f0 | 2015-04-14 18:22:54 -0700 | [diff] [blame] | 21 | import android.content.Context; |
| 22 | import android.content.Intent; |
Clara Bayarri | a0c2dc3 | 2016-04-12 12:00:15 +0100 | [diff] [blame] | 23 | import android.content.IntentSender; |
Todd Kennedy | a5fc6f0 | 2015-04-14 18:22:54 -0700 | [diff] [blame] | 24 | import android.os.Bundle; |
| 25 | import android.os.Handler; |
| 26 | import android.util.ArrayMap; |
Todd Kennedy | a5fc6f0 | 2015-04-14 18:22:54 -0700 | [diff] [blame] | 27 | import android.view.LayoutInflater; |
| 28 | import android.view.View; |
| 29 | |
| 30 | import java.io.FileDescriptor; |
| 31 | import java.io.PrintWriter; |
| 32 | |
| 33 | /** |
| 34 | * Integration points with the Fragment host. |
| 35 | * <p> |
| 36 | * Fragments may be hosted by any object; such as an {@link Activity}. In order to |
| 37 | * host fragments, implement {@link FragmentHostCallback}, overriding the methods |
| 38 | * applicable to the host. |
| 39 | */ |
| 40 | public abstract class FragmentHostCallback<E> extends FragmentContainer { |
| 41 | private final Activity mActivity; |
| 42 | final Context mContext; |
| 43 | private final Handler mHandler; |
| 44 | final int mWindowAnimations; |
| 45 | final FragmentManagerImpl mFragmentManager = new FragmentManagerImpl(); |
Todd Kennedy | 2ee19c7f | 2015-10-19 15:31:51 -0700 | [diff] [blame] | 46 | /** The loader managers for individual fragments [i.e. Fragment#getLoaderManager()] */ |
Todd Kennedy | a5fc6f0 | 2015-04-14 18:22:54 -0700 | [diff] [blame] | 47 | private ArrayMap<String, LoaderManager> mAllLoaderManagers; |
Todd Kennedy | 2ee19c7f | 2015-10-19 15:31:51 -0700 | [diff] [blame] | 48 | /** Whether or not fragment loaders should retain their state */ |
| 49 | private boolean mRetainLoaders; |
| 50 | /** The loader manger for the fragment host [i.e. Activity#getLoaderManager()] */ |
Todd Kennedy | a5fc6f0 | 2015-04-14 18:22:54 -0700 | [diff] [blame] | 51 | private LoaderManagerImpl mLoaderManager; |
| 52 | private boolean mCheckedForLoaderManager; |
Todd Kennedy | 2ee19c7f | 2015-10-19 15:31:51 -0700 | [diff] [blame] | 53 | /** Whether or not the fragment host loader manager was started */ |
Todd Kennedy | a5fc6f0 | 2015-04-14 18:22:54 -0700 | [diff] [blame] | 54 | private boolean mLoadersStarted; |
| 55 | |
| 56 | public FragmentHostCallback(Context context, Handler handler, int windowAnimations) { |
| 57 | this(null /*activity*/, context, handler, windowAnimations); |
| 58 | } |
| 59 | |
| 60 | FragmentHostCallback(Activity activity) { |
| 61 | this(activity, activity /*context*/, activity.mHandler, 0 /*windowAnimations*/); |
| 62 | } |
| 63 | |
| 64 | FragmentHostCallback(Activity activity, Context context, Handler handler, |
| 65 | int windowAnimations) { |
| 66 | mActivity = activity; |
| 67 | mContext = context; |
| 68 | mHandler = handler; |
| 69 | mWindowAnimations = windowAnimations; |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * Print internal state into the given stream. |
| 74 | * |
| 75 | * @param prefix Desired prefix to prepend at each line of output. |
| 76 | * @param fd The raw file descriptor that the dump is being sent to. |
| 77 | * @param writer The PrintWriter to which you should dump your state. This will be closed |
| 78 | * for you after you return. |
| 79 | * @param args additional arguments to the dump request. |
| 80 | */ |
| 81 | public void onDump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) { |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * Return {@code true} if the fragment's state needs to be saved. |
| 86 | */ |
| 87 | public boolean onShouldSaveFragmentState(Fragment fragment) { |
| 88 | return true; |
| 89 | } |
| 90 | |
| 91 | /** |
| 92 | * Return a {@link LayoutInflater}. |
| 93 | * See {@link Activity#getLayoutInflater()}. |
| 94 | */ |
| 95 | public LayoutInflater onGetLayoutInflater() { |
| 96 | return (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE); |
| 97 | } |
| 98 | |
| 99 | /** |
| 100 | * Return {@code true} if the FragmentManager's LayoutInflaterFactory should be used. |
| 101 | */ |
| 102 | public boolean onUseFragmentManagerInflaterFactory() { |
| 103 | return false; |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * Return the object that's currently hosting the fragment. If a {@link Fragment} |
| 108 | * is hosted by a {@link Activity}, the object returned here should be the same |
| 109 | * object returned from {@link Fragment#getActivity()}. |
| 110 | */ |
| 111 | @Nullable |
| 112 | public abstract E onGetHost(); |
| 113 | |
| 114 | /** |
| 115 | * Invalidates the activity's options menu. |
| 116 | * See {@link Activity#invalidateOptionsMenu()} |
| 117 | */ |
| 118 | public void onInvalidateOptionsMenu() { |
| 119 | } |
| 120 | |
| 121 | /** |
| 122 | * Starts a new {@link Activity} from the given fragment. |
| 123 | * See {@link Activity#startActivityForResult(Intent, int)}. |
| 124 | */ |
| 125 | public void onStartActivityFromFragment(Fragment fragment, Intent intent, int requestCode, |
| 126 | Bundle options) { |
| 127 | if (requestCode != -1) { |
| 128 | throw new IllegalStateException( |
| 129 | "Starting activity with a requestCode requires a FragmentActivity host"); |
| 130 | } |
| 131 | mContext.startActivity(intent); |
| 132 | } |
| 133 | |
| 134 | /** |
Clara Bayarri | a0c2dc3 | 2016-04-12 12:00:15 +0100 | [diff] [blame] | 135 | * Starts a new {@link IntentSender} from the given fragment. |
| 136 | * See {@link Activity#startIntentSender(IntentSender, Intent, int, int, int, Bundle)}. |
| 137 | */ |
| 138 | public void onStartIntentSenderFromFragment(Fragment fragment, IntentSender intent, |
| 139 | int requestCode, @Nullable Intent fillInIntent, int flagsMask, int flagsValues, |
| 140 | int extraFlags, Bundle options) throws IntentSender.SendIntentException { |
| 141 | if (requestCode != -1) { |
| 142 | throw new IllegalStateException( |
| 143 | "Starting intent sender with a requestCode requires a FragmentActivity host"); |
| 144 | } |
| 145 | mContext.startIntentSender(intent, fillInIntent, flagsMask, flagsValues, extraFlags, |
| 146 | options); |
| 147 | } |
| 148 | |
| 149 | /** |
Svetoslav | 970b59c | 2015-06-09 16:05:21 -0700 | [diff] [blame] | 150 | * Requests permissions from the given fragment. |
| 151 | * See {@link Activity#requestPermissions(String[], int)} |
| 152 | */ |
| 153 | public void onRequestPermissionsFromFragment(@NonNull Fragment fragment, |
| 154 | @NonNull String[] permissions, int requestCode) { |
| 155 | } |
| 156 | |
| 157 | /** |
Todd Kennedy | a5fc6f0 | 2015-04-14 18:22:54 -0700 | [diff] [blame] | 158 | * Return {@code true} if there are window animations. |
| 159 | */ |
| 160 | public boolean onHasWindowAnimations() { |
| 161 | return true; |
| 162 | } |
| 163 | |
| 164 | /** |
| 165 | * Return the window animations. |
| 166 | */ |
| 167 | public int onGetWindowAnimations() { |
| 168 | return mWindowAnimations; |
| 169 | } |
| 170 | |
Todd Kennedy | 434bd65 | 2015-05-04 12:29:50 -0700 | [diff] [blame] | 171 | /** |
| 172 | * Called when a {@link Fragment} is being attached to this host, immediately |
| 173 | * after the call to its {@link Fragment#onAttach(Context)} method and before |
| 174 | * {@link Fragment#onCreate(Bundle)}. |
| 175 | */ |
| 176 | public void onAttachFragment(Fragment fragment) { |
| 177 | } |
| 178 | |
Todd Kennedy | a5fc6f0 | 2015-04-14 18:22:54 -0700 | [diff] [blame] | 179 | @Nullable |
| 180 | @Override |
| 181 | public View onFindViewById(int id) { |
| 182 | return null; |
| 183 | } |
| 184 | |
| 185 | @Override |
| 186 | public boolean onHasView() { |
| 187 | return true; |
| 188 | } |
| 189 | |
Todd Kennedy | 2ee19c7f | 2015-10-19 15:31:51 -0700 | [diff] [blame] | 190 | boolean getRetainLoaders() { |
| 191 | return mRetainLoaders; |
| 192 | } |
| 193 | |
Todd Kennedy | a5fc6f0 | 2015-04-14 18:22:54 -0700 | [diff] [blame] | 194 | Activity getActivity() { |
| 195 | return mActivity; |
| 196 | } |
| 197 | |
| 198 | Context getContext() { |
| 199 | return mContext; |
| 200 | } |
| 201 | |
| 202 | Handler getHandler() { |
| 203 | return mHandler; |
| 204 | } |
| 205 | |
| 206 | FragmentManagerImpl getFragmentManagerImpl() { |
| 207 | return mFragmentManager; |
| 208 | } |
| 209 | |
| 210 | LoaderManagerImpl getLoaderManagerImpl() { |
| 211 | if (mLoaderManager != null) { |
| 212 | return mLoaderManager; |
| 213 | } |
| 214 | mCheckedForLoaderManager = true; |
| 215 | mLoaderManager = getLoaderManager("(root)", mLoadersStarted, true /*create*/); |
| 216 | return mLoaderManager; |
| 217 | } |
| 218 | |
| 219 | void inactivateFragment(String who) { |
| 220 | //Log.v(TAG, "invalidateSupportFragment: who=" + who); |
| 221 | if (mAllLoaderManagers != null) { |
| 222 | LoaderManagerImpl lm = (LoaderManagerImpl) mAllLoaderManagers.get(who); |
| 223 | if (lm != null && !lm.mRetaining) { |
| 224 | lm.doDestroy(); |
| 225 | mAllLoaderManagers.remove(who); |
| 226 | } |
| 227 | } |
| 228 | } |
| 229 | |
Todd Kennedy | a5fc6f0 | 2015-04-14 18:22:54 -0700 | [diff] [blame] | 230 | void doLoaderStart() { |
| 231 | if (mLoadersStarted) { |
| 232 | return; |
| 233 | } |
| 234 | mLoadersStarted = true; |
| 235 | |
| 236 | if (mLoaderManager != null) { |
| 237 | mLoaderManager.doStart(); |
| 238 | } else if (!mCheckedForLoaderManager) { |
| 239 | mLoaderManager = getLoaderManager("(root)", mLoadersStarted, false); |
| 240 | } |
| 241 | mCheckedForLoaderManager = true; |
| 242 | } |
| 243 | |
| 244 | void doLoaderStop(boolean retain) { |
Todd Kennedy | 2ee19c7f | 2015-10-19 15:31:51 -0700 | [diff] [blame] | 245 | mRetainLoaders = retain; |
| 246 | |
Todd Kennedy | a5fc6f0 | 2015-04-14 18:22:54 -0700 | [diff] [blame] | 247 | if (mLoaderManager == null) { |
| 248 | return; |
| 249 | } |
| 250 | |
| 251 | if (!mLoadersStarted) { |
| 252 | return; |
| 253 | } |
| 254 | mLoadersStarted = false; |
| 255 | |
| 256 | if (retain) { |
| 257 | mLoaderManager.doRetain(); |
| 258 | } else { |
| 259 | mLoaderManager.doStop(); |
| 260 | } |
| 261 | } |
| 262 | |
| 263 | void doLoaderRetain() { |
| 264 | if (mLoaderManager == null) { |
| 265 | return; |
| 266 | } |
| 267 | mLoaderManager.doRetain(); |
| 268 | } |
| 269 | |
| 270 | void doLoaderDestroy() { |
| 271 | if (mLoaderManager == null) { |
| 272 | return; |
| 273 | } |
| 274 | mLoaderManager.doDestroy(); |
| 275 | } |
| 276 | |
| 277 | void reportLoaderStart() { |
| 278 | if (mAllLoaderManagers != null) { |
| 279 | final int N = mAllLoaderManagers.size(); |
| 280 | LoaderManagerImpl loaders[] = new LoaderManagerImpl[N]; |
| 281 | for (int i=N-1; i>=0; i--) { |
| 282 | loaders[i] = (LoaderManagerImpl) mAllLoaderManagers.valueAt(i); |
| 283 | } |
| 284 | for (int i=0; i<N; i++) { |
| 285 | LoaderManagerImpl lm = loaders[i]; |
| 286 | lm.finishRetain(); |
| 287 | lm.doReportStart(); |
| 288 | } |
| 289 | } |
| 290 | } |
| 291 | |
| 292 | LoaderManagerImpl getLoaderManager(String who, boolean started, boolean create) { |
| 293 | if (mAllLoaderManagers == null) { |
| 294 | mAllLoaderManagers = new ArrayMap<String, LoaderManager>(); |
| 295 | } |
| 296 | LoaderManagerImpl lm = (LoaderManagerImpl) mAllLoaderManagers.get(who); |
| 297 | if (lm == null) { |
| 298 | if (create) { |
| 299 | lm = new LoaderManagerImpl(who, this, started); |
| 300 | mAllLoaderManagers.put(who, lm); |
| 301 | } |
| 302 | } else { |
| 303 | lm.updateHostController(this); |
| 304 | } |
| 305 | return lm; |
| 306 | } |
| 307 | |
| 308 | ArrayMap<String, LoaderManager> retainLoaderNonConfig() { |
| 309 | boolean retainLoaders = false; |
| 310 | if (mAllLoaderManagers != null) { |
Adam Powell | cbade7f | 2016-04-15 11:14:37 -0700 | [diff] [blame] | 311 | // Restart any loader managers that were already stopped so that they |
| 312 | // will be ready to retain |
Todd Kennedy | a5fc6f0 | 2015-04-14 18:22:54 -0700 | [diff] [blame] | 313 | final int N = mAllLoaderManagers.size(); |
| 314 | LoaderManagerImpl loaders[] = new LoaderManagerImpl[N]; |
| 315 | for (int i=N-1; i>=0; i--) { |
| 316 | loaders[i] = (LoaderManagerImpl) mAllLoaderManagers.valueAt(i); |
| 317 | } |
Adam Powell | cbade7f | 2016-04-15 11:14:37 -0700 | [diff] [blame] | 318 | final boolean doRetainLoaders = getRetainLoaders(); |
Todd Kennedy | a5fc6f0 | 2015-04-14 18:22:54 -0700 | [diff] [blame] | 319 | for (int i=0; i<N; i++) { |
| 320 | LoaderManagerImpl lm = loaders[i]; |
Adam Powell | cbade7f | 2016-04-15 11:14:37 -0700 | [diff] [blame] | 321 | if (!lm.mRetaining && doRetainLoaders) { |
| 322 | if (!lm.mStarted) { |
| 323 | lm.doStart(); |
| 324 | } |
| 325 | lm.doRetain(); |
| 326 | } |
Todd Kennedy | a5fc6f0 | 2015-04-14 18:22:54 -0700 | [diff] [blame] | 327 | if (lm.mRetaining) { |
| 328 | retainLoaders = true; |
| 329 | } else { |
| 330 | lm.doDestroy(); |
| 331 | mAllLoaderManagers.remove(lm.mWho); |
| 332 | } |
| 333 | } |
| 334 | } |
| 335 | |
| 336 | if (retainLoaders) { |
| 337 | return mAllLoaderManagers; |
| 338 | } |
| 339 | return null; |
| 340 | } |
| 341 | |
| 342 | void restoreLoaderNonConfig(ArrayMap<String, LoaderManager> loaderManagers) { |
Adam Powell | 100ba76 | 2016-09-22 10:47:40 -0700 | [diff] [blame] | 343 | if (loaderManagers != null) { |
| 344 | for (int i = 0, N = loaderManagers.size(); i < N; i++) { |
| 345 | ((LoaderManagerImpl) loaderManagers.valueAt(i)).updateHostController(this); |
| 346 | } |
Adam Powell | 180202f | 2016-09-21 15:41:47 -0700 | [diff] [blame] | 347 | } |
Todd Kennedy | a5fc6f0 | 2015-04-14 18:22:54 -0700 | [diff] [blame] | 348 | mAllLoaderManagers = loaderManagers; |
| 349 | } |
| 350 | |
| 351 | void dumpLoaders(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) { |
| 352 | writer.print(prefix); writer.print("mLoadersStarted="); |
| 353 | writer.println(mLoadersStarted); |
| 354 | if (mLoaderManager != null) { |
| 355 | writer.print(prefix); writer.print("Loader Manager "); |
| 356 | writer.print(Integer.toHexString(System.identityHashCode(mLoaderManager))); |
| 357 | writer.println(":"); |
| 358 | mLoaderManager.dump(prefix + " ", fd, writer, args); |
| 359 | } |
| 360 | } |
| 361 | } |