+++ /dev/null
-/*
- * Copyright (C) 2011 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package android.support.v2.content;
-
-import android.content.Context;
-import android.database.ContentObserver;
-import android.database.Cursor;
-import android.net.Uri;
-
-import java.io.FileDescriptor;
-import java.io.PrintWriter;
-import java.util.Arrays;
-
-/**
- * Static library support version of the framework's {@link android.content.CursorLoader}.
- * Used to write apps that run on platforms prior to Android 3.0. When running
- * on Android 3.0 or above, this implementation is still used; it does not try
- * to switch to the framework's implementation. See the framework SDK
- * documentation for a class overview.
- */
-public class CursorLoader extends AsyncTaskLoader<Cursor> {
- final ForceLoadContentObserver mObserver;
-
- Uri mUri;
- String[] mProjection;
- String mSelection;
- String[] mSelectionArgs;
- String mSortOrder;
-
- Cursor mCursor;
-
- /* Runs on a worker thread */
- @Override
- public Cursor loadInBackground() {
- Cursor cursor = getContext().getContentResolver().query(mUri, mProjection, mSelection,
- mSelectionArgs, mSortOrder);
- if (cursor != null) {
- // Ensure the cursor window is filled
- cursor.getCount();
- registerContentObserver(cursor, mObserver);
- }
- return cursor;
- }
-
- /**
- * Registers an observer to get notifications from the content provider
- * when the cursor needs to be refreshed.
- */
- void registerContentObserver(Cursor cursor, ContentObserver observer) {
- cursor.registerContentObserver(mObserver);
- }
-
- /* Runs on the UI thread */
- @Override
- public void deliverResult(Cursor cursor) {
- if (isReset()) {
- // An async query came in while the loader is stopped
- if (cursor != null) {
- cursor.close();
- }
- return;
- }
- Cursor oldCursor = mCursor;
- mCursor = cursor;
-
- if (isStarted()) {
- super.deliverResult(cursor);
- }
-
- if (oldCursor != null && oldCursor != cursor && !oldCursor.isClosed()) {
- oldCursor.close();
- }
- }
-
- /**
- * Creates an empty unspecified CursorLoader. You must follow this with
- * calls to {@link #setUri(Uri)}, {@link #setSelection(String)}, etc
- * to specify the query to perform.
- */
- public CursorLoader(Context context) {
- super(context);
- mObserver = new ForceLoadContentObserver();
- }
-
- /**
- * Creates a fully-specified CursorLoader. See
- * {@link ContentResolver#query(Uri, String[], String, String[], String)
- * ContentResolver.query()} for documentation on the meaning of the
- * parameters. These will be passed as-is to that call.
- */
- public CursorLoader(Context context, Uri uri, String[] projection, String selection,
- String[] selectionArgs, String sortOrder) {
- super(context);
- mObserver = new ForceLoadContentObserver();
- mUri = uri;
- mProjection = projection;
- mSelection = selection;
- mSelectionArgs = selectionArgs;
- mSortOrder = sortOrder;
- }
-
- /**
- * Starts an asynchronous load of the contacts list data. When the result is ready the callbacks
- * will be called on the UI thread. If a previous load has been completed and is still valid
- * the result may be passed to the callbacks immediately.
- *
- * Must be called from the UI thread
- */
- @Override
- protected void onStartLoading() {
- if (mCursor != null) {
- deliverResult(mCursor);
- }
- if (takeContentChanged() || mCursor == null) {
- forceLoad();
- }
- }
-
- /**
- * Must be called from the UI thread
- */
- @Override
- protected void onStopLoading() {
- // Attempt to cancel the current load task if possible.
- cancelLoad();
- }
-
- @Override
- public void onCanceled(Cursor cursor) {
- if (cursor != null && !cursor.isClosed()) {
- cursor.close();
- }
- }
-
- @Override
- protected void onReset() {
- super.onReset();
-
- // Ensure the loader is stopped
- onStopLoading();
-
- if (mCursor != null && !mCursor.isClosed()) {
- mCursor.close();
- }
- mCursor = null;
- }
-
- public Uri getUri() {
- return mUri;
- }
-
- public void setUri(Uri uri) {
- mUri = uri;
- }
-
- public String[] getProjection() {
- return mProjection;
- }
-
- public void setProjection(String[] projection) {
- mProjection = projection;
- }
-
- public String getSelection() {
- return mSelection;
- }
-
- public void setSelection(String selection) {
- mSelection = selection;
- }
-
- public String[] getSelectionArgs() {
- return mSelectionArgs;
- }
-
- public void setSelectionArgs(String[] selectionArgs) {
- mSelectionArgs = selectionArgs;
- }
-
- public String getSortOrder() {
- return mSortOrder;
- }
-
- public void setSortOrder(String sortOrder) {
- mSortOrder = sortOrder;
- }
-
- @Override
- public void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) {
- super.dump(prefix, fd, writer, args);
- writer.print(prefix); writer.print("mUri="); writer.println(mUri);
- writer.print(prefix); writer.print("mProjection=");
- writer.println(Arrays.toString(mProjection));
- writer.print(prefix); writer.print("mSelection="); writer.println(mSelection);
- writer.print(prefix); writer.print("mSelectionArgs=");
- writer.println(Arrays.toString(mSelectionArgs));
- writer.print(prefix); writer.print("mSortOrder="); writer.println(mSortOrder);
- writer.print(prefix); writer.print("mCursor="); writer.println(mCursor);
- writer.print(prefix); writer.print("mContentChanged="); writer.println(mContentChanged);
- }
-}
notaz.gp2x.de / android_pandora.git / blobdiff