src/com/android/gallery3d/app/SlideshowPage.java - LeafOS-Project/android_packages_apps_Gallery2 - Gitiles

 /*
  * Copyright (C) 2010 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 com.android.gallery3d.app;

 import java.util.ArrayList;
 import java.util.Random;

 import android.app.Activity;
 import android.content.Intent;
 //import android.drm.DrmHelper;
 import android.graphics.Bitmap;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Message;
 import android.view.MotionEvent;

 import com.android.gallery3d.R;
 import com.android.gallery3d.common.Utils;
 import com.android.gallery3d.data.ContentListener;
 import com.android.gallery3d.data.MediaItem;
 import com.android.gallery3d.data.MediaObject;
 import com.android.gallery3d.data.MediaSet;
 import com.android.gallery3d.data.Path;
 import com.android.gallery3d.glrenderer.GLCanvas;
 import com.android.gallery3d.ui.GLView;
 import com.android.gallery3d.ui.SlideshowView;
 import com.android.gallery3d.ui.SynchronizedHandler;
 import com.android.gallery3d.util.Future;
 import com.android.gallery3d.util.FutureListener;

 public class SlideshowPage extends ActivityState {
     private static final String TAG = "SlideshowPage";

     public static final String KEY_SET_PATH = "media-set-path";
     public static final String KEY_ITEM_PATH = "media-item-path";
     public static final String KEY_PHOTO_INDEX = "photo-index";
     public static final String KEY_RANDOM_ORDER = "random-order";
     public static final String KEY_REPEAT = "repeat";
     public static final String KEY_DREAM = "dream";

     private static final long SLIDESHOW_DELAY = 3000; // 3 seconds

     private static final int MSG_LOAD_NEXT_BITMAP = 1;
     private static final int MSG_SHOW_PENDING_BITMAP = 2;

     public static interface Model {
         public void pause();

         public void resume();

         public Future<Slide> nextSlide(FutureListener<Slide> listener);
     }

     public static class Slide {
         public Bitmap bitmap;
         public MediaItem item;
         public int index;

         public Slide(MediaItem item, int index, Bitmap bitmap) {
             this.bitmap = bitmap;
             this.item = item;
             this.index = index;
         }
     }

     private Handler mHandler;
     private Model mModel;
     private SlideshowView mSlideshowView;

     private Slide mPendingSlide = null;
     private boolean mIsActive = false;
     private final Intent mResultIntent = new Intent();

     @Override
     protected int getBackgroundColorId() {
         return R.color.slideshow_background;
     }

     private final GLView mRootPane = new GLView() {
         @Override
         protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
             mSlideshowView.layout(0, 0, right - left, bottom - top);
         }

         @Override
         protected boolean onTouch(MotionEvent event) {
             if (event.getAction() == MotionEvent.ACTION_UP) {
                 onBackPressed();
             }
             return true;
         }

         @Override
         protected void renderBackground(GLCanvas canvas) {
             canvas.clearBuffer(getBackgroundColor());
         }
     };

     @Override
     public void onCreate(Bundle data, Bundle restoreState) {
         super.onCreate(data, restoreState);
         ((GalleryActivity) mActivity).toggleNavBar(false);

         mFlags |= (FLAG_HIDE_ACTION_BAR | FLAG_HIDE_STATUS_BAR | FLAG_SCREEN_FULL);
         if (data.getBoolean(KEY_DREAM)) {
             // Dream screensaver only keeps screen on for plugged devices.
             mFlags |= FLAG_SCREEN_ON_WHEN_PLUGGED | FLAG_SHOW_WHEN_LOCKED;
         } else {
             // User-initiated slideshow would always keep screen on.
             mFlags |= FLAG_SCREEN_ON_ALWAYS;
         }

         mHandler = new SynchronizedHandler(mActivity.getGLRoot()) {
             @Override
             public void handleMessage(Message message) {
                 switch (message.what) {
                     case MSG_SHOW_PENDING_BITMAP:
                         showPendingBitmap();
                         break;
                     case MSG_LOAD_NEXT_BITMAP:
                         loadNextBitmap();
                         break;
                     default: throw new AssertionError();
                 }
             }
         };
         initializeViews();
         initializeData(data);
         Log.d(GalleryActivity.QSST, "enter slide show successfully");
     }

     private void loadNextBitmap() {
         mModel.nextSlide(new FutureListener<Slide>() {
             @Override
             public void onFutureDone(Future<Slide> future) {
                 mPendingSlide = future.get();
                 mHandler.sendEmptyMessage(MSG_SHOW_PENDING_BITMAP);
             }
         });
     }

     private void showPendingBitmap() {
         // mPendingBitmap could be null, if
         // 1.) there is no more items
         // 2.) mModel is paused
         Slide slide = mPendingSlide;
         if (slide == null) {
             if (mIsActive) {
                 mActivity.getStateManager().finishState(SlideshowPage.this);
             }
             return;
         }

         mSlideshowView.next(slide.bitmap, slide.item.getRotation());

         setStateResult(Activity.RESULT_OK, mResultIntent
                 .putExtra(KEY_ITEM_PATH, slide.item.getPath().toString())
                 .putExtra(KEY_PHOTO_INDEX, slide.index));
         mHandler.sendEmptyMessageDelayed(MSG_LOAD_NEXT_BITMAP, SLIDESHOW_DELAY);
     }

     @Override
     public void onPause() {
         super.onPause();
         if (mActivity.getStateManager().getStateCount() <= 1) {
             ((GalleryActivity) mActivity).toggleNavBar(true);
         }
         mIsActive = false;
         mModel.pause();
         mSlideshowView.release();

         mHandler.removeMessages(MSG_LOAD_NEXT_BITMAP);
         mHandler.removeMessages(MSG_SHOW_PENDING_BITMAP);
     }

     @Override
     public void onResume() {
         super.onResume();
         ((GalleryActivity) mActivity).toggleNavBar(false);
         mIsActive = true;
         mModel.resume();

         if (mPendingSlide != null) {
             showPendingBitmap();
         } else {
             loadNextBitmap();
         }
     }

     private void initializeData(Bundle data) {
         boolean random = data.getBoolean(KEY_RANDOM_ORDER, false);

         // We only want to show slideshow for images only, not videos.
         String mediaPath = data.getString(KEY_SET_PATH);
         mediaPath = FilterUtils.newFilterPath(mediaPath, FilterUtils.FILTER_IMAGE_ONLY);
         MediaSet mediaSet = mActivity.getDataManager().getMediaSet(mediaPath);

         if (random) {
             boolean repeat = data.getBoolean(KEY_REPEAT);
             mModel = new SlideshowDataAdapter(mActivity,
                     new ShuffleSource(mediaSet, repeat), 0, null);
             setStateResult(Activity.RESULT_OK, mResultIntent.putExtra(KEY_PHOTO_INDEX, 0));
         } else {
             int index = data.getInt(KEY_PHOTO_INDEX);
             String itemPath = data.getString(KEY_ITEM_PATH);
             Path path = itemPath != null ? Path.fromString(itemPath) : null;
             boolean repeat = data.getBoolean(KEY_REPEAT);
             mModel = new SlideshowDataAdapter(mActivity, new SequentialSource(mediaSet, repeat),
                     index, path);
             setStateResult(Activity.RESULT_OK, mResultIntent.putExtra(KEY_PHOTO_INDEX, index));
         }
     }

     private void initializeViews() {
         mSlideshowView = new SlideshowView();
         mRootPane.addComponent(mSlideshowView);
         setContentPane(mRootPane);
     }

     private static MediaItem findMediaItem(MediaSet mediaSet, int index) {
         for (int i = 0, n = mediaSet.getSubMediaSetCount(); i < n; ++i) {
             MediaSet subset = mediaSet.getSubMediaSet(i);
             int count = subset.getTotalMediaItemCount();
             if (index < count) {
                 return findMediaItem(subset, index);
             }
             index -= count;
         }
         ArrayList<MediaItem> list = mediaSet.getMediaItem(index, 1);
         return list.isEmpty() ? null : list.get(0);
     }

     private static class ShuffleSource implements SlideshowDataAdapter.SlideshowSource {
         private static final int RETRY_COUNT = 5;
         private final MediaSet mMediaSet;
         private final Random mRandom = new Random();
         private int mOrder[] = new int[0];
         private final boolean mRepeat;
         private long mSourceVersion = MediaSet.INVALID_DATA_VERSION;
         private int mLastIndex = -1;

         public ShuffleSource(MediaSet mediaSet, boolean repeat) {
             mMediaSet = Utils.checkNotNull(mediaSet);
             mRepeat = repeat;
         }

         @Override
         public int findItemIndex(Path path, int hint) {
             return hint;
         }

         @Override
         public MediaItem getMediaItem(int index) {
             if (!mRepeat && index >= mOrder.length) return null;
             if (mOrder.length == 0) return null;
             mLastIndex = mOrder[index % mOrder.length];
             MediaItem item = findMediaItem(mMediaSet, mLastIndex);
             for (int i = 0; i < RETRY_COUNT && item == null; ++i) {
                 Log.w(TAG, "fail to find image: " + mLastIndex);
                 mLastIndex = mRandom.nextInt(mOrder.length);
                 item = findMediaItem(mMediaSet, mLastIndex);
             }
             return item;
         }

         @Override
         public long reload() {
             long version = mMediaSet.reload();
             if (version != mSourceVersion) {
                 mSourceVersion = version;
                 int count = mMediaSet.getTotalMediaItemCount();
                 if (count != mOrder.length) generateOrderArray(count);
             }
             return version;
         }

         private void generateOrderArray(int totalCount) {
             if (mOrder.length != totalCount) {
                 mOrder = new int[totalCount];
                 for (int i = 0; i < totalCount; ++i) {
                     mOrder[i] = i;
                 }
             }
             for (int i = totalCount - 1; i > 0; --i) {
                 Utils.swap(mOrder, i, mRandom.nextInt(i + 1));
             }
             if (mOrder[0] == mLastIndex && totalCount > 1) {
                 Utils.swap(mOrder, 0, mRandom.nextInt(totalCount - 1) + 1);
             }
         }

         @Override
         public void addContentListener(ContentListener listener) {
             mMediaSet.addContentListener(listener);
         }

         @Override
         public void removeContentListener(ContentListener listener) {
             mMediaSet.removeContentListener(listener);
         }
     }

     private static class SequentialSource implements SlideshowDataAdapter.SlideshowSource {
         private static final int DATA_SIZE = 32;

         private ArrayList<MediaItem> mData = new ArrayList<MediaItem>();
         private int mDataStart = 0;
         private long mDataVersion = MediaObject.INVALID_DATA_VERSION;
         private final MediaSet mMediaSet;
         private final boolean mRepeat;

         public SequentialSource(MediaSet mediaSet, boolean repeat) {
             mMediaSet = mediaSet;
             mRepeat = repeat;
         }

         @Override
         public int findItemIndex(Path path, int hint) {
             return mMediaSet.getIndexOfItem(path, hint);
         }

         @Override
         public MediaItem getMediaItem(int index) {
             int dataEnd = mDataStart + mData.size();

             if (mRepeat) {
                 int count = mMediaSet.getMediaItemCount();
                 if (count == 0) return null;
                 index = index % count;
             }
             if (index < mDataStart || index >= dataEnd) {
                 mData = mMediaSet.getMediaItem(index, DATA_SIZE);
                 mDataStart = index;
                 dataEnd = index + mData.size();

                 // Consume license once in each element of the slide-show
                 // This is a non-blocking loop operation
 //                for (int i = 0; i < mData.size(); i++) {
 //                    String path = mData.get(i).getFilePath();
 //                    if (DrmHelper.isDrmFile(path)) {
 //                        DrmHelper.consumeDrmRights(path, "image/*");
 //                    }
 //                }
             }

             return (index < mDataStart || index >= dataEnd) ? null : mData.get(index - mDataStart);
         }

         @Override
         public long reload() {
             long version = mMediaSet.reload();
             if (version != mDataVersion) {
                 mDataVersion = version;
                 mData.clear();
             }
             return mDataVersion;
         }

         @Override
         public void addContentListener(ContentListener listener) {
             mMediaSet.addContentListener(listener);
         }

         @Override
         public void removeContentListener(ContentListener listener) {
             mMediaSet.removeContentListener(listener);
         }
     }
 }
	/*
	* Copyright (C) 2010 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 com.android.gallery3d.app;

	import java.util.ArrayList;
	import java.util.Random;

	import android.app.Activity;
	import android.content.Intent;
	//import android.drm.DrmHelper;
	import android.graphics.Bitmap;
	import android.os.Bundle;
	import android.os.Handler;
	import android.os.Message;
	import android.view.MotionEvent;

	import com.android.gallery3d.R;
	import com.android.gallery3d.common.Utils;
	import com.android.gallery3d.data.ContentListener;
	import com.android.gallery3d.data.MediaItem;
	import com.android.gallery3d.data.MediaObject;
	import com.android.gallery3d.data.MediaSet;
	import com.android.gallery3d.data.Path;
	import com.android.gallery3d.glrenderer.GLCanvas;
	import com.android.gallery3d.ui.GLView;
	import com.android.gallery3d.ui.SlideshowView;
	import com.android.gallery3d.ui.SynchronizedHandler;
	import com.android.gallery3d.util.Future;
	import com.android.gallery3d.util.FutureListener;

	public class SlideshowPage extends ActivityState {
	private static final String TAG = "SlideshowPage";

	public static final String KEY_SET_PATH = "media-set-path";
	public static final String KEY_ITEM_PATH = "media-item-path";
	public static final String KEY_PHOTO_INDEX = "photo-index";
	public static final String KEY_RANDOM_ORDER = "random-order";
	public static final String KEY_REPEAT = "repeat";
	public static final String KEY_DREAM = "dream";

	private static final long SLIDESHOW_DELAY = 3000; // 3 seconds

	private static final int MSG_LOAD_NEXT_BITMAP = 1;
	private static final int MSG_SHOW_PENDING_BITMAP = 2;

	public static interface Model {
	public void pause();

	public void resume();

	public Future<Slide> nextSlide(FutureListener<Slide> listener);
	}

	public static class Slide {
	public Bitmap bitmap;
	public MediaItem item;
	public int index;

	public Slide(MediaItem item, int index, Bitmap bitmap) {
	this.bitmap = bitmap;
	this.item = item;
	this.index = index;
	}
	}

	private Handler mHandler;
	private Model mModel;
	private SlideshowView mSlideshowView;

	private Slide mPendingSlide = null;
	private boolean mIsActive = false;
	private final Intent mResultIntent = new Intent();

	@Override
	protected int getBackgroundColorId() {
	return R.color.slideshow_background;
	}

	private final GLView mRootPane = new GLView() {
	@Override
	protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
	mSlideshowView.layout(0, 0, right - left, bottom - top);
	}

	@Override
	protected boolean onTouch(MotionEvent event) {
	if (event.getAction() == MotionEvent.ACTION_UP) {
	onBackPressed();
	}
	return true;
	}

	@Override
	protected void renderBackground(GLCanvas canvas) {
	canvas.clearBuffer(getBackgroundColor());
	}
	};

	@Override
	public void onCreate(Bundle data, Bundle restoreState) {
	super.onCreate(data, restoreState);
	((GalleryActivity) mActivity).toggleNavBar(false);

	mFlags \|= (FLAG_HIDE_ACTION_BAR \| FLAG_HIDE_STATUS_BAR \| FLAG_SCREEN_FULL);
	if (data.getBoolean(KEY_DREAM)) {
	// Dream screensaver only keeps screen on for plugged devices.
	mFlags \|= FLAG_SCREEN_ON_WHEN_PLUGGED \| FLAG_SHOW_WHEN_LOCKED;
	} else {
	// User-initiated slideshow would always keep screen on.
	mFlags \|= FLAG_SCREEN_ON_ALWAYS;
	}

	mHandler = new SynchronizedHandler(mActivity.getGLRoot()) {
	@Override
	public void handleMessage(Message message) {
	switch (message.what) {
	case MSG_SHOW_PENDING_BITMAP:
	showPendingBitmap();
	break;
	case MSG_LOAD_NEXT_BITMAP:
	loadNextBitmap();
	break;
	default: throw new AssertionError();
	}
	}
	};
	initializeViews();
	initializeData(data);
	Log.d(GalleryActivity.QSST, "enter slide show successfully");
	}

	private void loadNextBitmap() {
	mModel.nextSlide(new FutureListener<Slide>() {
	@Override
	public void onFutureDone(Future<Slide> future) {
	mPendingSlide = future.get();
	mHandler.sendEmptyMessage(MSG_SHOW_PENDING_BITMAP);
	}
	});
	}

	private void showPendingBitmap() {
	// mPendingBitmap could be null, if
	// 1.) there is no more items
	// 2.) mModel is paused
	Slide slide = mPendingSlide;
	if (slide == null) {
	if (mIsActive) {
	mActivity.getStateManager().finishState(SlideshowPage.this);
	}
	return;
	}

	mSlideshowView.next(slide.bitmap, slide.item.getRotation());

	setStateResult(Activity.RESULT_OK, mResultIntent
	.putExtra(KEY_ITEM_PATH, slide.item.getPath().toString())
	.putExtra(KEY_PHOTO_INDEX, slide.index));
	mHandler.sendEmptyMessageDelayed(MSG_LOAD_NEXT_BITMAP, SLIDESHOW_DELAY);
	}

	@Override
	public void onPause() {
	super.onPause();
	if (mActivity.getStateManager().getStateCount() <= 1) {
	((GalleryActivity) mActivity).toggleNavBar(true);
	}
	mIsActive = false;
	mModel.pause();
	mSlideshowView.release();

	mHandler.removeMessages(MSG_LOAD_NEXT_BITMAP);
	mHandler.removeMessages(MSG_SHOW_PENDING_BITMAP);
	}

	@Override
	public void onResume() {
	super.onResume();
	((GalleryActivity) mActivity).toggleNavBar(false);
	mIsActive = true;
	mModel.resume();

	if (mPendingSlide != null) {
	showPendingBitmap();
	} else {
	loadNextBitmap();
	}
	}

	private void initializeData(Bundle data) {
	boolean random = data.getBoolean(KEY_RANDOM_ORDER, false);

	// We only want to show slideshow for images only, not videos.
	String mediaPath = data.getString(KEY_SET_PATH);
	mediaPath = FilterUtils.newFilterPath(mediaPath, FilterUtils.FILTER_IMAGE_ONLY);
	MediaSet mediaSet = mActivity.getDataManager().getMediaSet(mediaPath);

	if (random) {
	boolean repeat = data.getBoolean(KEY_REPEAT);
	mModel = new SlideshowDataAdapter(mActivity,
	new ShuffleSource(mediaSet, repeat), 0, null);
	setStateResult(Activity.RESULT_OK, mResultIntent.putExtra(KEY_PHOTO_INDEX, 0));
	} else {
	int index = data.getInt(KEY_PHOTO_INDEX);
	String itemPath = data.getString(KEY_ITEM_PATH);
	Path path = itemPath != null ? Path.fromString(itemPath) : null;
	boolean repeat = data.getBoolean(KEY_REPEAT);
	mModel = new SlideshowDataAdapter(mActivity, new SequentialSource(mediaSet, repeat),
	index, path);
	setStateResult(Activity.RESULT_OK, mResultIntent.putExtra(KEY_PHOTO_INDEX, index));
	}
	}

	private void initializeViews() {
	mSlideshowView = new SlideshowView();
	mRootPane.addComponent(mSlideshowView);
	setContentPane(mRootPane);
	}

	private static MediaItem findMediaItem(MediaSet mediaSet, int index) {
	for (int i = 0, n = mediaSet.getSubMediaSetCount(); i < n; ++i) {
	MediaSet subset = mediaSet.getSubMediaSet(i);
	int count = subset.getTotalMediaItemCount();
	if (index < count) {
	return findMediaItem(subset, index);
	}
	index -= count;
	}
	ArrayList<MediaItem> list = mediaSet.getMediaItem(index, 1);
	return list.isEmpty() ? null : list.get(0);
	}

	private static class ShuffleSource implements SlideshowDataAdapter.SlideshowSource {
	private static final int RETRY_COUNT = 5;
	private final MediaSet mMediaSet;
	private final Random mRandom = new Random();
	private int mOrder[] = new int[0];
	private final boolean mRepeat;
	private long mSourceVersion = MediaSet.INVALID_DATA_VERSION;
	private int mLastIndex = -1;

	public ShuffleSource(MediaSet mediaSet, boolean repeat) {
	mMediaSet = Utils.checkNotNull(mediaSet);
	mRepeat = repeat;
	}

	@Override
	public int findItemIndex(Path path, int hint) {
	return hint;
	}

	@Override
	public MediaItem getMediaItem(int index) {
	if (!mRepeat && index >= mOrder.length) return null;
	if (mOrder.length == 0) return null;
	mLastIndex = mOrder[index % mOrder.length];
	MediaItem item = findMediaItem(mMediaSet, mLastIndex);
	for (int i = 0; i < RETRY_COUNT && item == null; ++i) {
	Log.w(TAG, "fail to find image: " + mLastIndex);
	mLastIndex = mRandom.nextInt(mOrder.length);
	item = findMediaItem(mMediaSet, mLastIndex);
	}
	return item;
	}

	@Override
	public long reload() {
	long version = mMediaSet.reload();
	if (version != mSourceVersion) {
	mSourceVersion = version;
	int count = mMediaSet.getTotalMediaItemCount();
	if (count != mOrder.length) generateOrderArray(count);
	}
	return version;
	}

	private void generateOrderArray(int totalCount) {
	if (mOrder.length != totalCount) {
	mOrder = new int[totalCount];
	for (int i = 0; i < totalCount; ++i) {
	mOrder[i] = i;
	}
	}
	for (int i = totalCount - 1; i > 0; --i) {
	Utils.swap(mOrder, i, mRandom.nextInt(i + 1));
	}
	if (mOrder[0] == mLastIndex && totalCount > 1) {
	Utils.swap(mOrder, 0, mRandom.nextInt(totalCount - 1) + 1);
	}
	}

	@Override
	public void addContentListener(ContentListener listener) {
	mMediaSet.addContentListener(listener);
	}

	@Override
	public void removeContentListener(ContentListener listener) {
	mMediaSet.removeContentListener(listener);
	}
	}

	private static class SequentialSource implements SlideshowDataAdapter.SlideshowSource {
	private static final int DATA_SIZE = 32;

	private ArrayList<MediaItem> mData = new ArrayList<MediaItem>();
	private int mDataStart = 0;
	private long mDataVersion = MediaObject.INVALID_DATA_VERSION;
	private final MediaSet mMediaSet;
	private final boolean mRepeat;

	public SequentialSource(MediaSet mediaSet, boolean repeat) {
	mMediaSet = mediaSet;
	mRepeat = repeat;
	}

	@Override
	public int findItemIndex(Path path, int hint) {
	return mMediaSet.getIndexOfItem(path, hint);
	}

	@Override
	public MediaItem getMediaItem(int index) {
	int dataEnd = mDataStart + mData.size();

	if (mRepeat) {
	int count = mMediaSet.getMediaItemCount();
	if (count == 0) return null;
	index = index % count;
	}
	if (index < mDataStart \|\| index >= dataEnd) {
	mData = mMediaSet.getMediaItem(index, DATA_SIZE);
	mDataStart = index;
	dataEnd = index + mData.size();

	// Consume license once in each element of the slide-show
	// This is a non-blocking loop operation
	// for (int i = 0; i < mData.size(); i++) {
	// String path = mData.get(i).getFilePath();
	// if (DrmHelper.isDrmFile(path)) {
	// DrmHelper.consumeDrmRights(path, "image/*");
	// }
	// }
	}

	return (index < mDataStart \|\| index >= dataEnd) ? null : mData.get(index - mDataStart);
	}

	@Override
	public long reload() {
	long version = mMediaSet.reload();
	if (version != mDataVersion) {
	mDataVersion = version;
	mData.clear();
	}
	return mDataVersion;
	}

	@Override
	public void addContentListener(ContentListener listener) {
	mMediaSet.addContentListener(listener);
	}

	@Override
	public void removeContentListener(ContentListener listener) {
	mMediaSet.removeContentListener(listener);
	}
	}
	}