Example usage for android.provider DocumentsContract EXTRA_LOADING

Introduction

In this page you can find the example usage for android.provider DocumentsContract EXTRA_LOADING.

Prototype

String EXTRA_LOADING

To view the source code for android.provider DocumentsContract EXTRA_LOADING.

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Document

Optional boolean flag included in a directory Cursor#getExtras() indicating that a document provider is still loading data.

Usage

From source file:cn.edu.wyu.documentviewer.RecentLoader.java

@Override
public DirectoryResult loadInBackground() {
    if (mFirstPassLatch == null) {
        // First time through we kick off all the recent tasks, and wait
        // around to see if everyone finishes quickly.

        final Collection<RootInfo> roots = mRoots.getMatchingRootsBlocking(mState);
        for (RootInfo root : roots) {
            if ((root.flags & Root.FLAG_SUPPORTS_RECENTS) != 0) {
                final RecentTask task = new RecentTask(root.authority, root.rootId);
                mTasks.put(root, task);/* w ww . j a va 2s.c  om*/
            }
        }

        mFirstPassLatch = new CountDownLatch(mTasks.size());
        for (RecentTask task : mTasks.values()) {
            ProviderExecutor.forAuthority(task.authority).execute(task);
        }

        try {
            mFirstPassLatch.await(MAX_FIRST_PASS_WAIT_MILLIS, TimeUnit.MILLISECONDS);
            mFirstPassDone = true;
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        }
    }

    final long rejectBefore = System.currentTimeMillis() - REJECT_OLDER_THAN;

    // Collect all finished tasks
    boolean allDone = true;
    List<Cursor> cursors = Lists.newArrayList();
    for (RecentTask task : mTasks.values()) {
        if (task.isDone()) {
            try {
                final Cursor cursor = task.get();
                if (cursor == null)
                    continue;

                final FilteringCursorWrapper filtered = new FilteringCursorWrapper(cursor, mState.acceptMimes,
                        RECENT_REJECT_MIMES, rejectBefore) {
                    @Override
                    public void close() {
                        // Ignored, since we manage cursor lifecycle internally
                    }
                };
                cursors.add(filtered);
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            } catch (ExecutionException e) {
                // We already logged on other side
            }
        } else {
            allDone = false;
        }
    }

    if (LOGD) {
        Log.d(TAG, "Found " + cursors.size() + " of " + mTasks.size() + " recent queries done");
    }

    final DirectoryResult result = new DirectoryResult();
    result.sortOrder = SORT_ORDER_LAST_MODIFIED;

    // Hint to UI if we're still loading
    final Bundle extras = new Bundle();
    if (!allDone) {
        extras.putBoolean(DocumentsContract.EXTRA_LOADING, true);
    }

    final Cursor merged;
    if (cursors.size() > 0) {
        merged = new MergeCursor(cursors.toArray(new Cursor[cursors.size()]));
    } else {
        // Return something when nobody is ready
        merged = new MatrixCursor(new String[0]);
    }

    final SortingCursorWrapper sorted = new SortingCursorWrapper(merged, result.sortOrder) {
        @Override
        public Bundle getExtras() {
            return extras;
        }
    };

    result.cursor = sorted;

    return result;
}

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From source file:com.seafile.seadroid2.provider.SeafileProvider.java

/**
 * Create a MatrixCursor with the option to enable the extraLoading flag.
 *
 * @param netProjection column list//  w w  w . j  a  v a  2 s  .com
 * @param extraLoading if true, the client will expect that more entries will arrive shortly.
 * @return the Cursor object
 */
private static MatrixCursor createCursor(String[] netProjection, final boolean extraLoading,
        final boolean isReachable) {
    return new MatrixCursor(netProjection) {
        @Override
        public Bundle getExtras() {
            Bundle b = new Bundle();
            b.putBoolean(DocumentsContract.EXTRA_LOADING, extraLoading);
            if (!extraLoading && !isReachable) {
                b.putString(DocumentsContract.EXTRA_ERROR, "Could not connect with server");
            }
            return b;
        }
    };
}

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