Example usage for android.database Cursor registerContentObserver

Introduction

In this page you can find the example usage for android.database Cursor registerContentObserver.

Prototype

void registerContentObserver(ContentObserver observer);

Source Link

Document

Register an observer that is called when changes happen to the content backing this cursor.

Usage

From source file:com.cattle.util.CursorPagerAdapter.java

/**
 * Swap in a new Cursor, returning the old Cursor. Unlike {@link #changeCursor(android.database.Cursor)}, the
 * returned old Cursor is <em>not</em> closed.
 *
 * @param newCursor The new cursor to be used.
 * @return Returns the previously set Cursor, or null if there was not one. If the given new Cursor
 *         is the same instance is the previously set Cursor, null is also returned.
 *//* w  w  w.j  a v a  2 s.  co  m*/
public Cursor swapCursor(Cursor newCursor) {
    if (newCursor == mCursor) {
        return null;
    }
    Cursor oldCursor = mCursor;
    if (oldCursor != null) {
        if (mChangeObserver != null) {
            oldCursor.unregisterContentObserver(mChangeObserver);
        }
        if (mDataSetObserver != null) {
            oldCursor.unregisterDataSetObserver(mDataSetObserver);
        }
    }
    mCursor = newCursor;
    if (newCursor != null) {
        if (mChangeObserver != null) {
            newCursor.registerContentObserver(mChangeObserver);
        }
        if (mDataSetObserver != null) {
            newCursor.registerDataSetObserver(mDataSetObserver);
        }
        mRowIDColumn = newCursor.getColumnIndexOrThrow("_id");
        mDataValid = true;
        // notify the observers about the new cursor
        notifyDataSetChanged();
    } else {
        mRowIDColumn = -1;
        mDataValid = false;
        // notify the observers about the lack of a data set
        notifyDataSetChanged();
    }
    return oldCursor;
}

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From source file:com.niveales.library.utils.MyCursorAdapter.java

/**
 * Swap in a new Cursor, returning the old Cursor.  Unlike
 * {@link #changeCursor(Cursor)}, the returned old Cursor is <em>not</em>
 * closed./*from  w w w . j  a  va2 s  . com*/
 *
 * @param newCursor The new cursor to be used.
 * @return Returns the previously set Cursor, or null if there wasa not one.
 * If the given new Cursor is the same instance is the previously set
 * Cursor, null is also returned.
 */
public Cursor swapCursor(Cursor newCursor) {
    if (newCursor == mCursor) {
        return null;
    }
    Cursor oldCursor = mCursor;
    if (oldCursor != null) {
        if (mChangeObserver != null)
            oldCursor.unregisterContentObserver(mChangeObserver);
        if (mDataSetObserver != null)
            oldCursor.unregisterDataSetObserver(mDataSetObserver);
    }
    mCursor = newCursor;
    if (newCursor != null) {
        if (mChangeObserver != null)
            newCursor.registerContentObserver(mChangeObserver);
        if (mDataSetObserver != null)
            newCursor.registerDataSetObserver(mDataSetObserver);
        mRowIDColumn = newCursor.getColumnIndexOrThrow(id_field);
        mDataValid = true;
        // notify the observers about the new cursor
        notifyDataSetChanged();
    } else {
        mRowIDColumn = -1;
        mDataValid = false;
        // notify the observers about the lack of a data set
        notifyDataSetInvalidated();
    }
    return oldCursor;
}

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From source file:com.cattle.util.CursorPagerAdapter.java

void init(Context context, Cursor c, int flags) {
    if ((flags & FLAG_AUTO_REQUERY) == FLAG_AUTO_REQUERY) {
        flags |= FLAG_REGISTER_CONTENT_OBSERVER;
        mAutoRequery = true;/*  ww  w. j a  va  2  s  .c o  m*/
    } else {
        mAutoRequery = false;
    }
    boolean cursorPresent = c != null;
    mCursor = c;
    mDataValid = cursorPresent;
    mContext = context;
    mRowIDColumn = cursorPresent ? c.getColumnIndexOrThrow("_id") : -1;
    if ((flags & FLAG_REGISTER_CONTENT_OBSERVER) == FLAG_REGISTER_CONTENT_OBSERVER) {
        mChangeObserver = new ChangeObserver();
        mDataSetObserver = new MyDataSetObserver();
    } else {
        mChangeObserver = null;
        mDataSetObserver = null;
    }

    if (cursorPresent) {
        if (mChangeObserver != null) {
            c.registerContentObserver(mChangeObserver);
        }
        if (mDataSetObserver != null) {
            c.registerDataSetObserver(mDataSetObserver);
        }
    }
}

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From source file:uk.co.senab.photup.util.CursorPagerAdapter.java

void init(Context context, Cursor c, int flags) {
    if ((flags & FLAG_AUTO_REQUERY) == FLAG_AUTO_REQUERY) {
        flags |= FLAG_REGISTER_CONTENT_OBSERVER;
        mAutoRequery = true;//  w w w . ja  va2s.c o m
    } else {
        mAutoRequery = false;
    }
    boolean cursorPresent = c != null;
    mCursor = c;
    mDataValid = cursorPresent;
    mContext = context;
    mRowIDColumn = cursorPresent ? c.getColumnIndexOrThrow("_id") : -1;
    if ((flags & FLAG_REGISTER_CONTENT_OBSERVER) == FLAG_REGISTER_CONTENT_OBSERVER) {
        mChangeObserver = new ChangeObserver();
        mDataSetObserver = new MyDataSetObserver();
    } else {
        mChangeObserver = null;
        mDataSetObserver = null;
    }

    if (cursorPresent) {
        if (mChangeObserver != null)
            c.registerContentObserver(mChangeObserver);
        if (mDataSetObserver != null)
            c.registerDataSetObserver(mDataSetObserver);
    }
}

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From source file:com.niveales.library.utils.MyCursorAdapter.java

void init(Context context, Cursor c, int flags, String id_field) {
    this.id_field = id_field;
    if ((flags & FLAG_AUTO_REQUERY) == FLAG_AUTO_REQUERY) {
        flags |= FLAG_REGISTER_CONTENT_OBSERVER;
        mAutoRequery = true;//from ww w.  j  a v a2s.  c o m
    } else {
        mAutoRequery = false;
    }
    boolean cursorPresent = c != null;
    mCursor = c;
    mDataValid = cursorPresent;
    mContext = context;
    mRowIDColumn = cursorPresent ? c.getColumnIndexOrThrow(id_field) : -1;
    if ((flags & FLAG_REGISTER_CONTENT_OBSERVER) == FLAG_REGISTER_CONTENT_OBSERVER) {
        mChangeObserver = new ChangeObserver();
        mDataSetObserver = new MyDataSetObserver();
    } else {
        mChangeObserver = null;
        mDataSetObserver = null;
    }

    if (cursorPresent) {
        if (mChangeObserver != null)
            c.registerContentObserver(mChangeObserver);
        if (mDataSetObserver != null)
            c.registerDataSetObserver(mDataSetObserver);
    }
}

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

@Override
public final DirectoryResult loadInBackground() {
    synchronized (this) {
        if (isLoadInBackgroundCanceled()) {
            throw new OperationCanceledException();
        }//from w  w w.j  a va 2 s.co  m
        mSignal = new CancellationSignal();
    }

    final ContentResolver resolver = getContext().getContentResolver();
    final String authority = mUri.getAuthority();

    final DirectoryResult result = new DirectoryResult();

    int userMode = State.MODE_UNKNOWN;

    // Use default document when searching
    if (mType == DirectoryFragment.TYPE_SEARCH) {
        final Uri docUri = DocumentsContract.buildDocumentUri(mRoot.authority, mRoot.documentId);
        try {
            mDoc = DocumentInfo.fromUri(resolver, docUri);
        } catch (FileNotFoundException e) {
            Log.w(TAG, "Failed to query", e);
            result.exception = e;
            return result;
        }
    }

    // Pick up any custom modes requested by user
    Cursor cursor = null;
    try {
        final Uri stateUri = RecentsProvider.buildState(mRoot.authority, mRoot.rootId, mDoc.documentId);
        cursor = resolver.query(stateUri, null, null, null, null);
        if (cursor.moveToFirst()) {
            userMode = getCursorInt(cursor, StateColumns.MODE);
        }
    } finally {
        IOUtils.closeQuietly(cursor);
    }

    if (userMode != State.MODE_UNKNOWN) {
        result.mode = userMode;
    } else {
        if ((mDoc.flags & Document.FLAG_DIR_PREFERS_GRID) != 0) {
            result.mode = State.MODE_GRID;
        } else {
            result.mode = State.MODE_LIST;
        }
    }

    if (mUserSortOrder != State.SORT_ORDER_UNKNOWN) {
        result.sortOrder = mUserSortOrder;
    } else {
        if ((mDoc.flags & Document.FLAG_DIR_PREFERS_LAST_MODIFIED) != 0) {
            result.sortOrder = State.SORT_ORDER_LAST_MODIFIED;
        } else {
            result.sortOrder = State.SORT_ORDER_DISPLAY_NAME;
        }
    }

    // Search always uses ranking from provider
    if (mType == DirectoryFragment.TYPE_SEARCH) {
        result.sortOrder = State.SORT_ORDER_UNKNOWN;
    }

    Log.d(TAG, "userMode=" + userMode + ", userSortOrder=" + mUserSortOrder + " --> mode=" + result.mode
            + ", sortOrder=" + result.sortOrder);

    ContentProviderClient client = null;
    try {
        client = DocumentsApplication.acquireUnstableProviderOrThrow(resolver, authority);

        cursor = client.query(mUri, null, null, null, getQuerySortOrder(result.sortOrder), mSignal);
        cursor.registerContentObserver(mObserver);

        cursor = new RootCursorWrapper(mUri.getAuthority(), mRoot.rootId, cursor, -1);

        if (mType == DirectoryFragment.TYPE_SEARCH) {
            // Filter directories out of search results, for now
            cursor = new FilteringCursorWrapper(cursor, null, SEARCH_REJECT_MIMES);
        } else {
            // Normal directories should have sorting applied
            cursor = new SortingCursorWrapper(cursor, result.sortOrder);
        }

        result.client = client;
        result.cursor = cursor;
    } catch (Exception e) {
        Log.w(TAG, "Failed to query", e);
        result.exception = e;
        ContentProviderClient.releaseQuietly(client);
    } finally {
        synchronized (this) {
            mSignal = null;
        }
    }

    return result;
}

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