2 * Copyright (C) 2010 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
19 import android.content.Loader;
20 import android.os.Bundle;
21 import android.util.DebugUtils;
22 import android.util.Log;
23 import android.util.SparseArray;
25 import java.io.FileDescriptor;
26 import java.io.PrintWriter;
27 import java.lang.reflect.Modifier;
30 * Interface associated with an {@link Activity} or {@link Fragment} for managing
31 * one or more {@link android.content.Loader} instances associated with it. This
32 * helps an application manage longer-running operations in conjunction with the
33 * Activity or Fragment lifecycle; the most common use of this is with a
34 * {@link android.content.CursorLoader}, however applications are free to write
35 * their own loaders for loading other types of data.
37 * While the LoaderManager API was introduced in
38 * {@link android.os.Build.VERSION_CODES#HONEYCOMB}, a version of the API
39 * at is also available for use on older platforms through
40 * {@link android.support.v4.app.FragmentActivity}. See the blog post
41 * <a href="http://android-developers.blogspot.com/2011/03/fragments-for-all.html">
42 * Fragments For All</a> for more details.
44 * <p>As an example, here is the full implementation of a {@link Fragment}
45 * that displays a {@link android.widget.ListView} containing the results of
46 * a query against the contacts content provider. It uses a
47 * {@link android.content.CursorLoader} to manage the query on the provider.
49 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/LoaderCursor.java
52 * <div class="special reference">
53 * <h3>Developer Guides</h3>
54 * <p>For more information about using loaders, read the
55 * <a href="{@docRoot}guide/topics/fundamentals/loaders.html">Loaders</a> developer guide.</p>
58 public abstract class LoaderManager {
60 * Callback interface for a client to interact with the manager.
62 public interface LoaderCallbacks<D> {
64 * Instantiate and return a new Loader for the given ID.
66 * @param id The ID whose loader is to be created.
67 * @param args Any arguments supplied by the caller.
68 * @return Return a new Loader instance that is ready to start loading.
70 public Loader<D> onCreateLoader(int id, Bundle args);
73 * Called when a previously created loader has finished its load. Note
74 * that normally an application is <em>not</em> allowed to commit fragment
75 * transactions while in this call, since it can happen after an
76 * activity's state is saved. See {@link FragmentManager#beginTransaction()
77 * FragmentManager.openTransaction()} for further discussion on this.
79 * <p>This function is guaranteed to be called prior to the release of
80 * the last data that was supplied for this Loader. At this point
81 * you should remove all use of the old data (since it will be released
82 * soon), but should not do your own release of the data since its Loader
83 * owns it and will take care of that. The Loader will take care of
84 * management of its data so you don't have to. In particular:
87 * <li> <p>The Loader will monitor for changes to the data, and report
88 * them to you through new calls here. You should not monitor the
89 * data yourself. For example, if the data is a {@link android.database.Cursor}
90 * and you place it in a {@link android.widget.CursorAdapter}, use
91 * the {@link android.widget.CursorAdapter#CursorAdapter(android.content.Context,
92 * android.database.Cursor, int)} constructor <em>without</em> passing
93 * in either {@link android.widget.CursorAdapter#FLAG_AUTO_REQUERY}
94 * or {@link android.widget.CursorAdapter#FLAG_REGISTER_CONTENT_OBSERVER}
95 * (that is, use 0 for the flags argument). This prevents the CursorAdapter
96 * from doing its own observing of the Cursor, which is not needed since
97 * when a change happens you will get a new Cursor throw another call
99 * <li> The Loader will release the data once it knows the application
100 * is no longer using it. For example, if the data is
101 * a {@link android.database.Cursor} from a {@link android.content.CursorLoader},
102 * you should not call close() on it yourself. If the Cursor is being placed in a
103 * {@link android.widget.CursorAdapter}, you should use the
104 * {@link android.widget.CursorAdapter#swapCursor(android.database.Cursor)}
105 * method so that the old Cursor is not closed.
108 * @param loader The Loader that has finished.
109 * @param data The data generated by the Loader.
111 public void onLoadFinished(Loader<D> loader, D data);
114 * Called when a previously created loader is being reset, and thus
115 * making its data unavailable. The application should at this point
116 * remove any references it has to the Loader's data.
118 * @param loader The Loader that is being reset.
120 public void onLoaderReset(Loader<D> loader);
124 * Ensures a loader is initialized and active. If the loader doesn't
125 * already exist, one is created and (if the activity/fragment is currently
126 * started) starts the loader. Otherwise the last created
129 * <p>In either case, the given callback is associated with the loader, and
130 * will be called as the loader state changes. If at the point of call
131 * the caller is in its started state, and the requested loader
132 * already exists and has generated its data, then
133 * callback {@link LoaderCallbacks#onLoadFinished} will
134 * be called immediately (inside of this function), so you must be prepared
135 * for this to happen.
137 * @param id A unique identifier for this loader. Can be whatever you want.
138 * Identifiers are scoped to a particular LoaderManager instance.
139 * @param args Optional arguments to supply to the loader at construction.
140 * If a loader already exists (a new one does not need to be created), this
141 * parameter will be ignored and the last arguments continue to be used.
142 * @param callback Interface the LoaderManager will call to report about
143 * changes in the state of the loader. Required.
145 public abstract <D> Loader<D> initLoader(int id, Bundle args,
146 LoaderManager.LoaderCallbacks<D> callback);
149 * Starts a new or restarts an existing {@link android.content.Loader} in
150 * this manager, registers the callbacks to it,
151 * and (if the activity/fragment is currently started) starts loading it.
152 * If a loader with the same id has previously been
153 * started it will automatically be destroyed when the new loader completes
154 * its work. The callback will be delivered before the old loader
157 * @param id A unique identifier for this loader. Can be whatever you want.
158 * Identifiers are scoped to a particular LoaderManager instance.
159 * @param args Optional arguments to supply to the loader at construction.
160 * @param callback Interface the LoaderManager will call to report about
161 * changes in the state of the loader. Required.
163 public abstract <D> Loader<D> restartLoader(int id, Bundle args,
164 LoaderManager.LoaderCallbacks<D> callback);
167 * Stops and removes the loader with the given ID. If this loader
168 * had previously reported data to the client through
169 * {@link LoaderCallbacks#onLoadFinished(Loader, Object)}, a call
170 * will be made to {@link LoaderCallbacks#onLoaderReset(Loader)}.
172 public abstract void destroyLoader(int id);
175 * Return the Loader with the given id or null if no matching Loader
178 public abstract <D> Loader<D> getLoader(int id);
181 * Print the LoaderManager's state into the given stream.
183 * @param prefix Text to print at the front of each line.
184 * @param fd The raw file descriptor that the dump is being sent to.
185 * @param writer A PrintWriter to which the dump is to be set.
186 * @param args Additional arguments to the dump request.
188 public abstract void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args);
191 * Control whether the framework's internal loader manager debugging
192 * logs are turned on. If enabled, you will see output in logcat as
193 * the framework performs loader operations.
195 public static void enableDebugLogging(boolean enabled) {
196 LoaderManagerImpl.DEBUG = enabled;
199 /** @hide for internal testing only */
200 public FragmentHostCallback getFragmentHostCallback() { return null; }
203 class LoaderManagerImpl extends LoaderManager {
204 static final String TAG = "LoaderManager";
205 static boolean DEBUG = false;
207 // These are the currently active loaders. A loader is here
208 // from the time its load is started until it has been explicitly
209 // stopped or restarted by the application.
210 final SparseArray<LoaderInfo> mLoaders = new SparseArray<LoaderInfo>(0);
212 // These are previously run loaders. This list is maintained internally
213 // to avoid destroying a loader while an application is still using it.
214 // It allows an application to restart a loader, but continue using its
215 // previously run loader until the new loader's data is available.
216 final SparseArray<LoaderInfo> mInactiveLoaders = new SparseArray<LoaderInfo>(0);
222 boolean mRetainingStarted;
224 boolean mCreatingLoader;
225 private FragmentHostCallback mHost;
227 final class LoaderInfo implements Loader.OnLoadCompleteListener<Object>,
228 Loader.OnLoadCanceledListener<Object> {
231 LoaderManager.LoaderCallbacks<Object> mCallbacks;
232 Loader<Object> mLoader;
234 boolean mDeliveredData;
238 boolean mRetainingStarted;
239 boolean mReportNextStart;
241 boolean mListenerRegistered;
243 LoaderInfo mPendingLoader;
245 public LoaderInfo(int id, Bundle args, LoaderManager.LoaderCallbacks<Object> callbacks) {
248 mCallbacks = callbacks;
252 if (mRetaining && mRetainingStarted) {
253 // Our owner is started, but we were being retained from a
254 // previous instance in the started state... so there is really
255 // nothing to do here, since the loaders are still started.
261 // If loader already started, don't restart.
267 if (DEBUG) Log.v(TAG, " Starting: " + this);
268 if (mLoader == null && mCallbacks != null) {
269 mLoader = mCallbacks.onCreateLoader(mId, mArgs);
271 if (mLoader != null) {
272 if (mLoader.getClass().isMemberClass()
273 && !Modifier.isStatic(mLoader.getClass().getModifiers())) {
274 throw new IllegalArgumentException(
275 "Object returned from onCreateLoader must not be a non-static inner member class: "
278 if (!mListenerRegistered) {
279 mLoader.registerListener(mId, this);
280 mLoader.registerOnLoadCanceledListener(this);
281 mListenerRegistered = true;
283 mLoader.startLoading();
288 if (DEBUG) Log.v(TAG, " Retaining: " + this);
290 mRetainingStarted = mStarted;
295 void finishRetain() {
297 if (DEBUG) Log.v(TAG, " Finished Retaining: " + this);
299 if (mStarted != mRetainingStarted) {
301 // This loader was retained in a started state, but
302 // at the end of retaining everything our owner is
303 // no longer started... so make it stop.
309 if (mStarted && mHaveData && !mReportNextStart) {
310 // This loader has retained its data, either completely across
311 // a configuration change or just whatever the last data set
312 // was after being restarted from a stop, and now at the point of
313 // finishing the retain we find we remain started, have
314 // our data, and the owner has a new callback... so
315 // let's deliver the data now.
316 callOnLoadFinished(mLoader, mData);
322 if (mReportNextStart) {
323 mReportNextStart = false;
324 if (mHaveData && !mRetaining) {
325 callOnLoadFinished(mLoader, mData);
332 if (DEBUG) Log.v(TAG, " Stopping: " + this);
335 if (mLoader != null && mListenerRegistered) {
336 // Let the loader know we're done with it
337 mListenerRegistered = false;
338 mLoader.unregisterListener(this);
339 mLoader.unregisterOnLoadCanceledListener(this);
340 mLoader.stopLoading();
346 if (DEBUG) Log.v(TAG, " Canceling: " + this);
347 if (mStarted && mLoader != null && mListenerRegistered) {
348 final boolean cancelLoadResult = mLoader.cancelLoad();
349 if (!cancelLoadResult) {
350 onLoadCanceled(mLoader);
352 return cancelLoadResult;
358 if (DEBUG) Log.v(TAG, " Destroying: " + this);
360 boolean needReset = mDeliveredData;
361 mDeliveredData = false;
362 if (mCallbacks != null && mLoader != null && mHaveData && needReset) {
363 if (DEBUG) Log.v(TAG, " Reseting: " + this);
364 String lastBecause = null;
366 lastBecause = mHost.mFragmentManager.mNoTransactionsBecause;
367 mHost.mFragmentManager.mNoTransactionsBecause = "onLoaderReset";
370 mCallbacks.onLoaderReset(mLoader);
373 mHost.mFragmentManager.mNoTransactionsBecause = lastBecause;
380 if (mLoader != null) {
381 if (mListenerRegistered) {
382 mListenerRegistered = false;
383 mLoader.unregisterListener(this);
384 mLoader.unregisterOnLoadCanceledListener(this);
388 if (mPendingLoader != null) {
389 mPendingLoader.destroy();
394 public void onLoadCanceled(Loader<Object> loader) {
395 if (DEBUG) Log.v(TAG, "onLoadCanceled: " + this);
398 if (DEBUG) Log.v(TAG, " Ignoring load canceled -- destroyed");
402 if (mLoaders.get(mId) != this) {
403 // This cancellation message is not coming from the current active loader.
404 // We don't care about it.
405 if (DEBUG) Log.v(TAG, " Ignoring load canceled -- not active");
409 LoaderInfo pending = mPendingLoader;
410 if (pending != null) {
411 // There is a new request pending and we were just
412 // waiting for the old one to cancel or complete before starting
413 // it. So now it is time, switch over to the new loader.
414 if (DEBUG) Log.v(TAG, " Switching to pending loader: " + pending);
415 mPendingLoader = null;
416 mLoaders.put(mId, null);
418 installLoader(pending);
423 public void onLoadComplete(Loader<Object> loader, Object data) {
424 if (DEBUG) Log.v(TAG, "onLoadComplete: " + this);
427 if (DEBUG) Log.v(TAG, " Ignoring load complete -- destroyed");
431 if (mLoaders.get(mId) != this) {
432 // This data is not coming from the current active loader.
433 // We don't care about it.
434 if (DEBUG) Log.v(TAG, " Ignoring load complete -- not active");
438 LoaderInfo pending = mPendingLoader;
439 if (pending != null) {
440 // There is a new request pending and we were just
441 // waiting for the old one to complete before starting
442 // it. So now it is time, switch over to the new loader.
443 if (DEBUG) Log.v(TAG, " Switching to pending loader: " + pending);
444 mPendingLoader = null;
445 mLoaders.put(mId, null);
447 installLoader(pending);
451 // Notify of the new data so the app can switch out the old data before
452 // we try to destroy it.
453 if (mData != data || !mHaveData) {
457 callOnLoadFinished(loader, data);
461 //if (DEBUG) Log.v(TAG, " onLoadFinished returned: " + this);
463 // We have now given the application the new loader with its
464 // loaded data, so it should have stopped using the previous
465 // loader. If there is a previous loader on the inactive list,
467 LoaderInfo info = mInactiveLoaders.get(mId);
468 if (info != null && info != this) {
469 info.mDeliveredData = false;
471 mInactiveLoaders.remove(mId);
474 if (mHost != null && !hasRunningLoaders()) {
475 mHost.mFragmentManager.startPendingDeferredFragments();
479 void callOnLoadFinished(Loader<Object> loader, Object data) {
480 if (mCallbacks != null) {
481 String lastBecause = null;
483 lastBecause = mHost.mFragmentManager.mNoTransactionsBecause;
484 mHost.mFragmentManager.mNoTransactionsBecause = "onLoadFinished";
487 if (DEBUG) Log.v(TAG, " onLoadFinished in " + loader + ": "
488 + loader.dataToString(data));
489 mCallbacks.onLoadFinished(loader, data);
492 mHost.mFragmentManager.mNoTransactionsBecause = lastBecause;
495 mDeliveredData = true;
500 public String toString() {
501 StringBuilder sb = new StringBuilder(64);
502 sb.append("LoaderInfo{");
503 sb.append(Integer.toHexString(System.identityHashCode(this)));
507 DebugUtils.buildShortClassTag(mLoader, sb);
509 return sb.toString();
512 public void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) {
513 writer.print(prefix); writer.print("mId="); writer.print(mId);
514 writer.print(" mArgs="); writer.println(mArgs);
515 writer.print(prefix); writer.print("mCallbacks="); writer.println(mCallbacks);
516 writer.print(prefix); writer.print("mLoader="); writer.println(mLoader);
517 if (mLoader != null) {
518 mLoader.dump(prefix + " ", fd, writer, args);
520 if (mHaveData || mDeliveredData) {
521 writer.print(prefix); writer.print("mHaveData="); writer.print(mHaveData);
522 writer.print(" mDeliveredData="); writer.println(mDeliveredData);
523 writer.print(prefix); writer.print("mData="); writer.println(mData);
525 writer.print(prefix); writer.print("mStarted="); writer.print(mStarted);
526 writer.print(" mReportNextStart="); writer.print(mReportNextStart);
527 writer.print(" mDestroyed="); writer.println(mDestroyed);
528 writer.print(prefix); writer.print("mRetaining="); writer.print(mRetaining);
529 writer.print(" mRetainingStarted="); writer.print(mRetainingStarted);
530 writer.print(" mListenerRegistered="); writer.println(mListenerRegistered);
531 if (mPendingLoader != null) {
532 writer.print(prefix); writer.println("Pending Loader ");
533 writer.print(mPendingLoader); writer.println(":");
534 mPendingLoader.dump(prefix + " ", fd, writer, args);
539 LoaderManagerImpl(String who, FragmentHostCallback host, boolean started) {
545 void updateHostController(FragmentHostCallback host) {
549 public FragmentHostCallback getFragmentHostCallback() {
553 private LoaderInfo createLoader(int id, Bundle args,
554 LoaderManager.LoaderCallbacks<Object> callback) {
555 LoaderInfo info = new LoaderInfo(id, args, (LoaderManager.LoaderCallbacks<Object>)callback);
556 Loader<Object> loader = callback.onCreateLoader(id, args);
557 info.mLoader = (Loader<Object>)loader;
561 private LoaderInfo createAndInstallLoader(int id, Bundle args,
562 LoaderManager.LoaderCallbacks<Object> callback) {
564 mCreatingLoader = true;
565 LoaderInfo info = createLoader(id, args, callback);
569 mCreatingLoader = false;
573 void installLoader(LoaderInfo info) {
574 mLoaders.put(info.mId, info);
576 // The activity will start all existing loaders in it's onStart(),
577 // so only start them here if we're past that point of the activitiy's
584 * Call to initialize a particular ID with a Loader. If this ID already
585 * has a Loader associated with it, it is left unchanged and any previous
586 * callbacks replaced with the newly provided ones. If there is not currently
587 * a Loader for the ID, a new one is created and started.
589 * <p>This function should generally be used when a component is initializing,
590 * to ensure that a Loader it relies on is created. This allows it to re-use
591 * an existing Loader's data if there already is one, so that for example
592 * when an {@link Activity} is re-created after a configuration change it
593 * does not need to re-create its loaders.
595 * <p>Note that in the case where an existing Loader is re-used, the
596 * <var>args</var> given here <em>will be ignored</em> because you will
597 * continue using the previous Loader.
599 * @param id A unique (to this LoaderManager instance) identifier under
600 * which to manage the new Loader.
601 * @param args Optional arguments that will be propagated to
602 * {@link LoaderCallbacks#onCreateLoader(int, Bundle) LoaderCallbacks.onCreateLoader()}.
603 * @param callback Interface implementing management of this Loader. Required.
604 * Its onCreateLoader() method will be called while inside of the function to
605 * instantiate the Loader object.
607 @SuppressWarnings("unchecked")
608 public <D> Loader<D> initLoader(int id, Bundle args, LoaderManager.LoaderCallbacks<D> callback) {
609 if (mCreatingLoader) {
610 throw new IllegalStateException("Called while creating a loader");
613 LoaderInfo info = mLoaders.get(id);
615 if (DEBUG) Log.v(TAG, "initLoader in " + this + ": args=" + args);
618 // Loader doesn't already exist; create.
619 info = createAndInstallLoader(id, args, (LoaderManager.LoaderCallbacks<Object>)callback);
620 if (DEBUG) Log.v(TAG, " Created new loader " + info);
622 if (DEBUG) Log.v(TAG, " Re-using existing loader " + info);
623 info.mCallbacks = (LoaderManager.LoaderCallbacks<Object>)callback;
626 if (info.mHaveData && mStarted) {
627 // If the loader has already generated its data, report it now.
628 info.callOnLoadFinished(info.mLoader, info.mData);
631 return (Loader<D>)info.mLoader;
635 * Call to re-create the Loader associated with a particular ID. If there
636 * is currently a Loader associated with this ID, it will be
637 * canceled/stopped/destroyed as appropriate. A new Loader with the given
638 * arguments will be created and its data delivered to you once available.
640 * <p>This function does some throttling of Loaders. If too many Loaders
641 * have been created for the given ID but not yet generated their data,
642 * new calls to this function will create and return a new Loader but not
643 * actually start it until some previous loaders have completed.
645 * <p>After calling this function, any previous Loaders associated with
646 * this ID will be considered invalid, and you will receive no further
647 * data updates from them.
649 * @param id A unique (to this LoaderManager instance) identifier under
650 * which to manage the new Loader.
651 * @param args Optional arguments that will be propagated to
652 * {@link LoaderCallbacks#onCreateLoader(int, Bundle) LoaderCallbacks.onCreateLoader()}.
653 * @param callback Interface implementing management of this Loader. Required.
654 * Its onCreateLoader() method will be called while inside of the function to
655 * instantiate the Loader object.
657 @SuppressWarnings("unchecked")
658 public <D> Loader<D> restartLoader(int id, Bundle args, LoaderManager.LoaderCallbacks<D> callback) {
659 if (mCreatingLoader) {
660 throw new IllegalStateException("Called while creating a loader");
663 LoaderInfo info = mLoaders.get(id);
664 if (DEBUG) Log.v(TAG, "restartLoader in " + this + ": args=" + args);
666 LoaderInfo inactive = mInactiveLoaders.get(id);
667 if (inactive != null) {
668 if (info.mHaveData) {
669 // This loader now has data... we are probably being
670 // called from within onLoadComplete, where we haven't
671 // yet destroyed the last inactive loader. So just do
673 if (DEBUG) Log.v(TAG, " Removing last inactive loader: " + info);
674 inactive.mDeliveredData = false;
676 info.mLoader.abandon();
677 mInactiveLoaders.put(id, info);
679 // We already have an inactive loader for this ID that we are
680 // waiting for! Try to cancel; if this returns true then the task is still
681 // running and we have more work to do.
682 if (!info.cancel()) {
683 // The current Loader has not been started or was successfully canceled,
684 // we thus have no reason to keep it around. Remove it and a new
685 // LoaderInfo will be created below.
686 if (DEBUG) Log.v(TAG, " Current loader is stopped; replacing");
687 mLoaders.put(id, null);
690 // Now we have three active loaders... we'll queue
691 // up this request to be processed once one of the other loaders
693 if (DEBUG) Log.v(TAG,
694 " Current loader is running; configuring pending loader");
695 if (info.mPendingLoader != null) {
696 if (DEBUG) Log.v(TAG, " Removing pending loader: " + info.mPendingLoader);
697 info.mPendingLoader.destroy();
698 info.mPendingLoader = null;
700 if (DEBUG) Log.v(TAG, " Enqueuing as new pending loader");
701 info.mPendingLoader = createLoader(id, args,
702 (LoaderManager.LoaderCallbacks<Object>)callback);
703 return (Loader<D>)info.mPendingLoader.mLoader;
707 // Keep track of the previous instance of this loader so we can destroy
708 // it when the new one completes.
709 if (DEBUG) Log.v(TAG, " Making last loader inactive: " + info);
710 info.mLoader.abandon();
711 mInactiveLoaders.put(id, info);
715 info = createAndInstallLoader(id, args, (LoaderManager.LoaderCallbacks<Object>)callback);
716 return (Loader<D>)info.mLoader;
720 * Rip down, tear apart, shred to pieces a current Loader ID. After returning
721 * from this function, any Loader objects associated with this ID are
722 * destroyed. Any data associated with them is destroyed. You better not
723 * be using it when you do this.
724 * @param id Identifier of the Loader to be destroyed.
726 public void destroyLoader(int id) {
727 if (mCreatingLoader) {
728 throw new IllegalStateException("Called while creating a loader");
731 if (DEBUG) Log.v(TAG, "destroyLoader in " + this + " of " + id);
732 int idx = mLoaders.indexOfKey(id);
734 LoaderInfo info = mLoaders.valueAt(idx);
735 mLoaders.removeAt(idx);
738 idx = mInactiveLoaders.indexOfKey(id);
740 LoaderInfo info = mInactiveLoaders.valueAt(idx);
741 mInactiveLoaders.removeAt(idx);
744 if (mHost != null && !hasRunningLoaders()) {
745 mHost.mFragmentManager.startPendingDeferredFragments();
750 * Return the most recent Loader object associated with the
753 @SuppressWarnings("unchecked")
754 public <D> Loader<D> getLoader(int id) {
755 if (mCreatingLoader) {
756 throw new IllegalStateException("Called while creating a loader");
759 LoaderInfo loaderInfo = mLoaders.get(id);
760 if (loaderInfo != null) {
761 if (loaderInfo.mPendingLoader != null) {
762 return (Loader<D>)loaderInfo.mPendingLoader.mLoader;
764 return (Loader<D>)loaderInfo.mLoader;
770 if (DEBUG) Log.v(TAG, "Starting in " + this);
772 RuntimeException e = new RuntimeException("here");
773 e.fillInStackTrace();
774 Log.w(TAG, "Called doStart when already started: " + this, e);
780 // Call out to sub classes so they can start their loaders
781 // Let the existing loaders know that we want to be notified when a load is complete
782 for (int i = mLoaders.size()-1; i >= 0; i--) {
783 mLoaders.valueAt(i).start();
788 if (DEBUG) Log.v(TAG, "Stopping in " + this);
790 RuntimeException e = new RuntimeException("here");
791 e.fillInStackTrace();
792 Log.w(TAG, "Called doStop when not started: " + this, e);
796 for (int i = mLoaders.size()-1; i >= 0; i--) {
797 mLoaders.valueAt(i).stop();
803 if (DEBUG) Log.v(TAG, "Retaining in " + this);
805 RuntimeException e = new RuntimeException("here");
806 e.fillInStackTrace();
807 Log.w(TAG, "Called doRetain when not started: " + this, e);
813 for (int i = mLoaders.size()-1; i >= 0; i--) {
814 mLoaders.valueAt(i).retain();
818 void finishRetain() {
820 if (DEBUG) Log.v(TAG, "Finished Retaining in " + this);
823 for (int i = mLoaders.size()-1; i >= 0; i--) {
824 mLoaders.valueAt(i).finishRetain();
829 void doReportNextStart() {
830 for (int i = mLoaders.size()-1; i >= 0; i--) {
831 mLoaders.valueAt(i).mReportNextStart = true;
835 void doReportStart() {
836 for (int i = mLoaders.size()-1; i >= 0; i--) {
837 mLoaders.valueAt(i).reportStart();
843 if (DEBUG) Log.v(TAG, "Destroying Active in " + this);
844 for (int i = mLoaders.size()-1; i >= 0; i--) {
845 mLoaders.valueAt(i).destroy();
850 if (DEBUG) Log.v(TAG, "Destroying Inactive in " + this);
851 for (int i = mInactiveLoaders.size()-1; i >= 0; i--) {
852 mInactiveLoaders.valueAt(i).destroy();
854 mInactiveLoaders.clear();
858 public String toString() {
859 StringBuilder sb = new StringBuilder(128);
860 sb.append("LoaderManager{");
861 sb.append(Integer.toHexString(System.identityHashCode(this)));
863 DebugUtils.buildShortClassTag(mHost, sb);
865 return sb.toString();
869 public void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) {
870 if (mLoaders.size() > 0) {
871 writer.print(prefix); writer.println("Active Loaders:");
872 String innerPrefix = prefix + " ";
873 for (int i=0; i < mLoaders.size(); i++) {
874 LoaderInfo li = mLoaders.valueAt(i);
875 writer.print(prefix); writer.print(" #"); writer.print(mLoaders.keyAt(i));
876 writer.print(": "); writer.println(li.toString());
877 li.dump(innerPrefix, fd, writer, args);
880 if (mInactiveLoaders.size() > 0) {
881 writer.print(prefix); writer.println("Inactive Loaders:");
882 String innerPrefix = prefix + " ";
883 for (int i=0; i < mInactiveLoaders.size(); i++) {
884 LoaderInfo li = mInactiveLoaders.valueAt(i);
885 writer.print(prefix); writer.print(" #"); writer.print(mInactiveLoaders.keyAt(i));
886 writer.print(": "); writer.println(li.toString());
887 li.dump(innerPrefix, fd, writer, args);
892 public boolean hasRunningLoaders() {
893 boolean loadersRunning = false;
894 final int count = mLoaders.size();
895 for (int i = 0; i < count; i++) {
896 final LoaderInfo li = mLoaders.valueAt(i);
897 loadersRunning |= li.mStarted && !li.mDeliveredData;
899 return loadersRunning;