图库-由新增Selfies自拍文件夾探索数据图片加载
这篇文章是基于图库-数据部分概述上讨论的
确定AlbumSeTabPage对应的AlbumSet实例
AlbumSetTabPage的数据加载要从其initializeData（）开始
private void initializeData() {
String mediaPath = "/local/show_and_pack_system/all";
mMediaSet = mActivity.getDataManager().getMediaSet(mediaPath);
mSelectionManager.setSourceMediaSet(mMediaSet);
mAlbumSetDataLoader = new AlbumSetDataLoader(
mActivity, mMediaSet, DATA_CACHE_SIZE);
mAlbumSetDataLoader.setLoadingListener(new MyLoadingListener());
mAlbumSetRenderer.setModel(mAlbumSetDataLoader);
//Gionee <liuyuankun> <2016-09-29> add for CR01764760 begin
//Gionee hushengsong 2017-05-16 modify for 137083 begin
if(Utils.gnVFflag&&StoryUtils.getAlbumSetFirstLoadFlag(mActivity.getAndroidContext())) {
mAlbumSetDataLoader.resume();
}
//Gionee hushengsong 2017-05-16 modify for 137083 end
//Gionee <liuyuankun> <2016-09-29> add for CR01764760 end
}
其mediaPath是"/local/show_and_pack_system/all"
看DataManager#getMediaObject（）
public MediaObject getMediaObject(Path path) {
//... ...
MediaSource source = mSourceMap.get(path.getPrefix());
//... ...
MediaObject object = source.createMediaObject(path);
}
public synchronized void initializeSourceMap() {
if (!mSourceMap.isEmpty()) return;
// the order matters, the UriSource must come last
addSource(new LocalSource(mApplication));
addSource(new ComboSource(mApplication));
addSource(new FilterSource(mApplication));
addSource(new UriSource(mApplication));
addSource(new StorySource(mApplication));
addSource(new StoryCoverSource(mApplication));
addSource(new PTSource(mApplication));
addSource(new KidsModeSource(mApplication));
addSource(new TrashSource(mApplication));
addSource(new TidySource(mApplication));
addSource(new PrivacySource(mApplication));
addPluginSource();
if (mActiveCount > 0) {
for (MediaSource source : mSourceMap.values()) {
source.resume();
}
}
}
mediaPath匹配到了LocalSource，看LocalSource的构造方法：
public LocalSource(GalleryApp context) {
super("local");
mApplication = context;
mMatcher = new PathMatcher();
mMatcher.add("/local/image", LOCAL_IMAGE_ALBUMSET);
mMatcher.add("/local/video", LOCAL_VIDEO_ALBUMSET);
mMatcher.add("/local/all", LOCAL_ALL_ALBUMSET);
mMatcher.add("/local/image/*", LOCAL_IMAGE_ALBUM);
mMatcher.add("/local/video/*", LOCAL_VIDEO_ALBUM);
mMatcher.add("/local/all/*", LOCAL_ALL_ALBUM);
mMatcher.add("/local/image/item/*", LOCAL_IMAGE_ITEM);
mMatcher.add("/local/video/item/*", LOCAL_VIDEO_ITEM);
mMatcher.add("/local/image/*/*", LOCAL_IMAGE_LIMITED_ALBUM);
mMatcher.add("/local/video/*/*", LOCAL_VIDEO_LIMITED_ALBUM);
mMatcher.add("/local/all/*/*", LOCAL_ALL_LIMITED_ALBUM);
mMatcher.add("/local/other/all", LOCAL_OTHER_ALL_ALBUMSET);
mMatcher.add("/local/show/all", LOCAL_SHOW_ALL_ALBUMSET);
mMatcher.add("/local/pt/other/all", LOCAL_PT_OTHER_ALL_ALBUMSET);
mMatcher.add("/local/show_and_pack_system/all", LOCAL_SHOW_ALL_AND_PACK_SYSTEM);
mMatcher.add("/local/show_and_filter_system/all", LOCAL_SHOW_ALL_AND_FILTER_SYSTEM);
mUriMatcher.addURI(MediaStore.AUTHORITY,
"external/images/media/#", LOCAL_IMAGE_ITEM);
mUriMatcher.addURI(MediaStore.AUTHORITY,
"external/video/media/#", LOCAL_VIDEO_ITEM);
mUriMatcher.addURI(MediaStore.AUTHORITY,
"external/images/media", LOCAL_IMAGE_ALBUM);
mUriMatcher.addURI(MediaStore.AUTHORITY,
"external/video/media", LOCAL_VIDEO_ALBUM);
mUriMatcher.addURI(MediaStore.AUTHORITY,
"external/file", LOCAL_ALL_ALBUM);
}
而LocalSource#createMediaObject(path);返回的是什么子类型呢，看下面代码
@Override
public MediaObject createMediaObject(Path path) {
GalleryApp app = mApplication;
switch (mMatcher.match(path)) {
case LOCAL_ALL_ALBUMSET:
case LOCAL_IMAGE_ALBUMSET:
case LOCAL_VIDEO_ALBUMSET:
return new LocalAlbumSet(path, mApplication);
case LOCAL_IMAGE_ALBUM:
return new LocalAlbum(path, app, mMatcher.getIntVar(0), true);
case LOCAL_VIDEO_ALBUM:
return new LocalAlbum(path, app, mMatcher.getIntVar(0), false);
case LOCAL_ALL_ALBUM: {
int bucketId = mMatcher.getIntVar(0);
DataManager dataManager = app.getDataManager();
MediaSet imageSet = (MediaSet) dataManager.getMediaObject(
LocalAlbumSet.PATH_IMAGE.getChild(bucketId));
MediaSet videoSet = (MediaSet) dataManager.getMediaObject(
LocalAlbumSet.PATH_VIDEO.getChild(bucketId));
Comparator<MediaItem> comp = DataManager.sDateTakenComparator;
return new LocalMergeAlbum(
path, comp, new MediaSet[]{imageSet, videoSet}, bucketId);
}
case LOCAL_IMAGE_LIMITED_ALBUM:
return new LocalAlbum(path, app, mMatcher.getIntVar(0), true, mMatcher.getLongVar(1));
case LOCAL_VIDEO_LIMITED_ALBUM:
return new LocalAlbum(path, app, mMatcher.getIntVar(0), false, mMatcher.getLongVar(1));
case LOCAL_ALL_LIMITED_ALBUM: {
int bucketId = mMatcher.getIntVar(0);
long timeSince = mMatcher.getLongVar(1);
DataManager dataManager = app.getDataManager();
MediaSet imageSet = (MediaSet) dataManager.getMediaObject(Path.fromString("/local/image/"
+ bucketId + "/" + timeSince));
MediaSet videoSet = (MediaSet) dataManager.getMediaObject(Path.fromString("/local/video/"
+ bucketId + "/" + timeSince));
Comparator<MediaItem> comp = DataManager.sDateTakenComparator;
return new LocalMergeAlbum(path, comp, new MediaSet[]{imageSet, videoSet}, bucketId);
}
case LOCAL_IMAGE_ITEM:
return new LocalImage(path, mApplication, mMatcher.getIntVar(0));
case LOCAL_VIDEO_ITEM:
return new LocalVideo(path, mApplication, mMatcher.getIntVar(0));
case LOCAL_OTHER_ALL_ALBUMSET:
return new LocalOtherAlbumSet(path, mApplication);
case LOCAL_SHOW_ALL_ALBUMSET:
return new LocalShowAlbumSet(path, mApplication);
case LOCAL_PT_OTHER_ALL_ALBUMSET:
return new LocalPTOtherAlbumSet(path, mApplication);
case LOCAL_SHOW_ALL_AND_PACK_SYSTEM:
return new LocalShowAndPackSystemAlbumSet(path, mApplication);
case LOCAL_SHOW_ALL_AND_FILTER_SYSTEM:
return new LocalShowAndFilterSystemAlbumSet(path, mApplication);
default:
throw new RuntimeException("bad path: " + path);
}
}
mMatcher.add("/local/show_and_pack_system/all", LOCAL_SHOW_ALL_AND_PACK_SYSTEM);看这句就知道其mediaPath对应的是LocalShowAndPackSystemAlbumSet
看LocalShowAndPackSystemAlbumSet
public LocalShowAndPackSystemAlbumSet(Path path, GalleryApp application) {
super(path, nextVersionNumber());
mGalleryApp = application;
DataManager dataManager = application.getDataManager();
mLocalShowAllMediaSet = dataManager.getMediaSet("/local/show/all");
mLocalShowAllMediaSet.addContentListener(this);
}
@Override
public MediaSet getSubMediaSet(int index) {
MediaSet localShowAllMediaSet = mLocalShowAllMediaSet;
int showCount = localShowAllMediaSet.getSubMediaSetCount();
//... ...
}
从上面方法结合LocalSource可以看出，LocalShowAndPackSystemAlbumSet不过是引用 LocalShowAlbumSet，下面看LocalShowAlbumSet的构造方法
public LocalShowAlbumSet(Path path, GalleryApp application) {
super(path, nextVersionNumber());
DataManager dataManager = application.getDataManager();
mLocalAllMediaSet = dataManager.getMediaSet("/local/all");
mLocalAllMediaSet.addContentListener(this);
mLocalOtherAllMediaSet = dataManager.getMediaSet("/local/other/all");
mLocalOtherAllMediaSet.addContentListener(this);
}
@Override
public MediaSet getSubMediaSet(int index) {
int localAllCount = mLocalAllMediaSet.getSubMediaSetCount();
int localOtherAllCount = mLocalOtherAllMediaSet.getSubMediaSetCount();
//没有隐藏和放在trash中的album
if (localOtherAllCount == 0 && index < localAllCount) {
return mLocalAllMediaSet.getSubMediaSet(index);
}
int count = -1;
//有隐藏或者在trash中的album
for (int i = 0; i < localAllCount; i++) {
MediaSet mediaSet = mLocalAllMediaSet.getSubMediaSet(i);
int bucketId = ((LocalMergeAlbum) mediaSet).getBucketId();
if (isShowBucketId(bucketId)) {
count++;
}
if (count == index) {
return mediaSet;
}
}
return null;
}
@Override
public int getSubMediaSetCount() {
int localAllCount = mLocalAllMediaSet.getSubMediaSetCount();
int localOtherAllCount = mLocalOtherAllMediaSet.getSubMediaSetCount();
//数目等于总album数减去other，那么other应该是隐藏的album加上已删除的在trash中但还未彻底删除的album
return Utils.clamp(localAllCount - localOtherAllCount, 0, localAllCount);
}
从上面代码可以看出LocalShowAlbumSet是持有了一个LocalAlbumSet和一个LocalOtherAlbumSet。
而这两个AlbumSet是什么关系呢。从上面getSubMediaSetCount()可以看出，LocalOtherAlbumSet应该是隐藏的album加上已删除的在trash中但还未彻底删除的album，
而LocalAlbumSet是所有的包括隐藏和在trash中的album。
上面确定了albumset后，那么下面就要开始初始化所有album了
初始化albums
首先看MediaSet#getSubMediaSet（）。
分析LocalAlbumSet从初始化album
1.LocalAlbumSet#getSubMediaSet（）
@Override
public MediaSet getSubMediaSet(int index) {
return mAlbums.get(index);
}
@Override
// synchronized on this function for
// 1. Prevent calling reload() concurrently.
// 2. Prevent calling onFutureDone() and reload() concurrently
public synchronized long reload() {
if (mNotifier.isDirty()) {
if (mLoadTask != null) mLoadTask.cancel();
mIsLoading = true;
mLoadTask = mApplication.getThreadPool().submit(new AlbumsLoader(), this);
}
if (mLoadBuffer != null) {
mAlbums = mLoadBuffer;
mLoadBuffer = null;
for (MediaSet album : mAlbums) {
album.reload();
}
mDataVersion = nextVersionNumber();
}
return mDataVersion;
}
@Override
public synchronized void onFutureDone(Future<ArrayList<MediaSet>> future) {
if (mLoadTask != future) return; // ignore, wait for the latest task
mLoadBuffer = future.get();
/// M: [BUG.MARK] @{
/* mIsLoading = false; */
/// @}
if (mLoadBuffer == null) mLoadBuffer = new ArrayList<MediaSet>();
mHandler.post(new Runnable() {
@Override
public void run() {
notifyContentChanged();
/// M: [BUG.ADD] @{
// To avoid timing issue of isLoading and notifyContentChanged,
// set mIsLoading as false here.
mIsLoading = false;
/// @}
}
});
}
mAlbums : ArrayList<MediaSet> 真正初始化入口是MediaSet#reload（）
reload()中看这句：mLoadTask = mApplication.getThreadPool().submit(new AlbumsLoader(), this);
还有：mAlbums = mLoadBuffer;
AlbumLoader异步加载完成后，会调用onFutureDone，将创建好的ArrayList<MediaSet> 传给mLoadBuffer。
下面看
private class AlbumsLoader implements ThreadPool.Job<ArrayList<MediaSet>> {
@Override
@SuppressWarnings("unchecked")
public ArrayList<MediaSet> run(JobContext jc) {
/// M: [DEBUG.ADD] @{
TraceHelper.traceBegin(">>>>LocalAlbumSet-AlbumsLoader");
/// @}
// Note: it will be faster if we only select media_type and bucket_id.
// need to test the performance if that is worth
BucketEntry[] entries = BucketHelper.loadBucketEntries(
jc, mApplication.getContentResolver(), mType);
/// M: [DEBUG.MODIFY] @{
/*if (jc.isCancelled()) return null;*/
if (jc.isCancelled()) {
TraceHelper.traceEnd();
return null;
}
/// @}
int offset = 0;
// Move camera and download bucket to the front, while keeping the
// order of others.
int index = findBucket(entries, MediaSetUtils.CAMERA_BUCKET_ID);
if (index != -1) {
circularShiftRight(entries, offset++, index);
}
//Gionee chenjs 2017-03-01 add for Selfie album begin
if (com.gionee.gallery3d.util.Utils.isSupportedSelfieFile()) {
index = findBucket(entries, MediaSetUtils.SELFIE_BUCKET_ID);
if (index != -1) {
if (com.gionee.gallery3d.util.Utils.gnGIflag) {
entries[index].bucketName = mApplication.getResources().getString(R.string.selfiestan);
} else {
entries[index].bucketName = mApplication.getResources().getString(R.string.selfies);
}
circularShiftRight(entries, offset++, index);
}
}
//Gionee chenjs 2017-03-01 add for Selfie album end
index = findBucket(entries, MediaSetUtils.DOWNLOAD_BUCKET_ID);
if (index != -1) {
circularShiftRight(entries, offset++, index);
}
ArrayList<MediaSet> albums = new ArrayList<MediaSet>();
DataManager dataManager = mApplication.getDataManager();
for (BucketEntry entry : entries) {
MediaSet album = getLocalAlbum(dataManager,
mType, mPath, entry.bucketId, entry.bucketName);
albums.add(album);
}
/// M: [DEBUG.ADD] @{
TraceHelper.traceEnd();
/// @}
return albums;
}
}
看这句：BucketEntry[] entries = BucketHelper.loadBucketEntries( jc, mApplication.getContentResolver(), mType);
创建Album的构造参数来自BucketEntry，其成员如下：
public static class BucketEntry {
public String bucketName;
public int bucketId;
public int dateTaken;
public BucketEntry(int id, String name) {
bucketId = id;
bucketName = Utils.ensureNotNull(name);
}
@Override
public int hashCode() {
return bucketId;
}
@Override
public boolean equals(Object object) {
if (!(object instanceof BucketEntry)) return false;
BucketEntry entry = (BucketEntry) object;
return bucketId == entry.bucketId;
}
}
看获取BucketEntry[] entries的过程：
public static BucketEntry[] loadBucketEntries(
JobContext jc, ContentResolver resolver, int type) {
if (ApiHelper.HAS_MEDIA_PROVIDER_FILES_TABLE) {
//主要分析该方法
return loadBucketEntriesFromFilesTable(jc, resolver, type);
} else {
return loadBucketEntriesFromImagesAndVideoTable(jc, resolver, type);
}
}
private static BucketEntry[] loadBucketEntriesFromFilesTable(
JobContext jc, ContentResolver resolver, int type) {
Uri uri = getFilesContentUri();
/// M: [FEATURE.MARK] @{
/*Cursor cursor = resolver.query(uri,
PROJECTION_BUCKET, BUCKET_GROUP_BY,
null, BUCKET_ORDER_BY);*/
String whereGroup = MediaFilterSetting.getExtWhereClause(null);
if (null == whereGroup || whereGroup.equals("")) {
whereGroup = VIDEO_IMAGE_CLAUSE + PURE_BUCKET_GROUP_BY;
} else {
whereGroup = "(" + VIDEO_IMAGE_CLAUSE + ") AND (" + whereGroup + ")" +
PURE_BUCKET_GROUP_BY;
}
//查询数据库，从上面看，projection是ImageColumns.BUCKET_ID， FileColumns.MEDIA_TYPE，
//ImageColumns.BUCKET_DISPLAY_NAME； BUCKET_ORDER_BY = "MAX(datetaken) DESC";
//VIDEO_IMAGE_CLAUSE = "media_type=1 OR media_type=3" , PURE_BUCKET_GROUP_BY = ") GROUP BY 1,(2"
//uri = Files.getContentUri("external"); 这是一个外部存储卡查询Android外部存储器的多媒体数据库的uri
Cursor cursor = resolver.query(uri,
PROJECTION_BUCKET, whereGroup,
null, BUCKET_ORDER_BY);
/// @}
if (cursor == null) {
Log.w(TAG, "cannot open local database: " + uri);
return new BucketEntry[0];
}
ArrayList<BucketEntry> buffer = new ArrayList<BucketEntry>();
int typeBits = 0;
if ((type & MediaObject.MEDIA_TYPE_IMAGE) != 0) {
typeBits |= (1 << FileColumns.MEDIA_TYPE_IMAGE);
}
if ((type & MediaObject.MEDIA_TYPE_VIDEO) != 0) {
typeBits |= (1 << FileColumns.MEDIA_TYPE_VIDEO);
}
try {
//根据查询到的列数据初始化entries
while (cursor.moveToNext()) {
if ((typeBits & (1 << cursor.getInt(INDEX_MEDIA_TYPE))) != 0) {
BucketEntry entry = new BucketEntry(
cursor.getInt(INDEX_BUCKET_ID),
cursor.getString(INDEX_BUCKET_NAME));
if (!buffer.contains(entry)) {
buffer.add(entry);
}
}
if (jc.isCancelled()) return null;
}
//因为自拍文件夹selfies是虚拟的，并没有真正的存在一个文件夹。只是根据前置摄像标志位camera_id==1在all页面中单独显示成一个集合。
//所以查询Android多媒体数据库是查不到的，需要自己建一个BucketEntry，下面加上的就是初始化selfies的过程
//Gionee chenjs 2017-03-01 add for Selfie album begin
if (com.gionee.gallery3d.util.Utils.isSupportedSelfieFile()) {
//是DCIM/Camera文件夹隐藏标志，一个是内置内存卡DCIM/Camera文件夹隐藏标志，一个是可移除的内存卡DCIM/Camera文件夹隐藏标志。隐藏了的话对应的自拍图片就不会显示出来。
boolean[] hasHide = {false, false};
//查询content://com.gionee.gallery3d.data.StoryProvider/other_folders。这是图库自带的数据库，可以查询到
cursor = resolver.query(StoryContract.OtherFolder.OTHER_FOLDER_URI,
new String[]{StoryContract.OtherFolder.COLUMN_BUCKET_ID}, null, null, null);
if (cursor != null) {
while (cursor.moveToNext()) {
if (cursor.getInt(0) == MediaSetUtils.CAMERA_BUCKET_ID) {
hasHide[0] = true;
//continue;
}
if (cursor.getInt(0) == com.gionee.gallery3d.util.MediaSetUtils.getExternalBucketID(GalleryAppImpl.getGalleryApp().getAndroidContext())) {
hasHide[1] = true;
}
/*if (cursor.getInt(0) == MediaSetUtils.getExternalBucketID(GalleryAppImpl.getGalleryApp().getAndroidContext())) {
hasHide[1] = true;
}*/
}
}
for (BucketEntry entry : buffer) {
//查看可移除的内存卡DCIM/Camera文件夹的自拍照片数目
if (entry.bucketId == MediaSetUtils.CAMERA_BUCKET_ID
|| entry.bucketId == com.gionee.gallery3d.util.MediaSetUtils.getExternalBucketID(GalleryAppImpl.getGalleryApp().getAndroidContext())) {
cursor = resolver.query(uri,
LocalImage.PROJECTION,
ImageColumns.DATA + " like? and camera_id=? and " +
ImageColumns.MIME_TYPE + " =?",
new String[]{"%"+Environment.getExternalStorageDirectory().toString()
+ "/DCIM/Camera" + "%", String.valueOf(1), "image/jpeg"},
ImageColumns.DATE_TAKEN + " DESC, "
+ ImageColumns._ID + " DESC");
int count = 0;
if (cursor != null) {
count = cursor.getCount();
}
//查看内置的内存卡DCIM/Camera文件夹的自拍照片数目
cursor = resolver.query(uri,
LocalImage.PROJECTION,
ImageColumns.DATA + " like? and camera_id=? and " +
ImageColumns.MIME_TYPE + " =?",
new String[]{"%"+ com.gionee.gallery3d.util.MediaSetUtils.getExternalPath()
+ "/DCIM/Camera" + "%", String.valueOf(1), "image/jpeg"},
ImageColumns.DATE_TAKEN + " DESC, "
+ ImageColumns._ID + " DESC");
int count1 = 0;
if (cursor != null) {
count1 = cursor.getCount();
}
//如果存在一个有自拍照片且没有隐藏的DCIM/Camera文件夹就创建这个对应Selfies的BucketEntry
if (!(hasHide[0] || count == 0) || !(hasHide[1] || count1 == 0)) {
buffer.add(new BucketEntry(MediaSetUtils.SELFIE_BUCKET_ID, "selfie"));
break;
}
}
}
}
//Gionee chenjs 2017-03-01 add for Selfie album end
} finally {
Utils.closeSilently(cursor);
}
return buffer.toArray(new BucketEntry[buffer.size()]);
}
具体代码解析看注释。BucketEntry数组就初始化完成了。那BucketEntry的构造参数是Bucketid和name。那么Bucketid怎么和album对应的呢？
怎么根据Bucketid知道Album中有哪些MediaItem的呢？
看LocalAlbumSet.AlbumsLoader#run()中的这几句，在entries初始化完后开始创建albums（MediaSet）
for (BucketEntry entry : entries) {
MediaSet album = getLocalAlbum(dataManager,
mType, mPath, entry.bucketId, entry.bucketName);
albums.add(album);
}
看LocalAlbumSet#getLocalAlbum（）
private MediaSet getLocalAlbum(
DataManager manager, int type, Path parent, int id, String name) {
synchronized (DataManager.LOCK) {
Path path = parent.getChild(id);
MediaObject object = manager.peekMediaObject(path);
if (object != null) return (MediaSet) object;
switch (type) {
case MEDIA_TYPE_IMAGE:
return new LocalAlbum(path, mApplication, id, true, name);
case MEDIA_TYPE_VIDEO:
return new LocalAlbum(path, mApplication, id, false, name);
case MEDIA_TYPE_ALL:
Comparator<MediaItem> comp = DataManager.sDateTakenComparator;
return new LocalMergeAlbum(path, comp, new MediaSet[] {
getLocalAlbum(manager, MEDIA_TYPE_IMAGE, PATH_IMAGE, id, name),
getLocalAlbum(manager, MEDIA_TYPE_VIDEO, PATH_VIDEO, id, name)}, id);
}
throw new IllegalArgumentException(String.valueOf(type));
}
}
最终初始化的album子类型又创建LocalAlbumSet时传入的Path有关，就是该与具体的bucketid无关。
跟踪代码分别有一下几种,来自MediaObject：
public static final String MEDIA_TYPE_IMAGE_STRING = "image";
public static final String MEDIA_TYPE_VIDEO_STRING = "video";
public static final String MEDIA_TYPE_ALL_STRING = "all";
public static int getTypeFromString(String s) {
//字段分别对应 if (MEDIA_TYPE_ALL_STRING.equals(s)) return MediaObject.MEDIA_TYPE_ALL; if (MEDIA_TYPE_IMAGE_STRING.equals(s)) return MediaObject.MEDIA_TYPE_IMAGE; if (MEDIA_TYPE_VIDEO_STRING.equals(s)) return MediaObject.MEDIA_TYPE_VIDEO; throw new IllegalArgumentException(s); }
而从之前的分析可以知道，LocalAlbumSet对应的是/local/all；LocalOtherAlbumSet对应的是/local/other/all；
所以该流程中，LocalAlbumSet实例化的LocalMergeAlbum。可以看出，LocalMergeAlbum的构造参数包括了
new MediaSet[] { getLocalAlbum(manager, MEDIA_TYPE_IMAGE, PATH_IMAGE, id, name), getLocalAlbum(manager,MEDIA_TYPE_VIDEO, PATH_VIDEO, id, name)}
就是LocalMergeAlbum封装了两个LocalAlbum，一个是所有MediaItem都是image类型的，一个所有MediaItem都是video类型的。
LocalAlbum根据媒体类型和bucketid去初始化MediaItem
album根据bucketId初始化MediaItem
下面看LocalALbum是如何初始化MediaItem的，下面看LocalAlbum的构造方法：
public LocalAlbum(Path path, GalleryApp application, int bucketId,
boolean isImage, String name) {
super(path, nextVersionNumber());
mApplication = application;
mResolver = application.getContentResolver();
mBucketId = bucketId;
/// M: [BUG.MODIFY] While this is no photo in Camera folder. should set the folder name @{
/* mName = name;*/
if (isCameraRoll() && name.equals("")) {
mName = application.getResources().getString(R.string.folder_camera);
Log.d(TAG, "<LocalAlbum> mName = " + mName);
} else {
mName = name;
}
/// @}
mIsImage = isImage;
//初始化查询参数，可以看到，都是去查询多媒体数据库，mBaseUri = Images.Media.EXTERNAL_CONTENT_URI或者mBaseUri = Video.Media.EXTERNAL_CONTENT_URI;
if (isImage) {
mWhereClause = ImageColumns.BUCKET_ID + " = ?";
mOrderClause = ImageColumns.DATE_TAKEN + " DESC, "
+ ImageColumns._ID + " DESC";
mBaseUri = Images.Media.EXTERNAL_CONTENT_URI;
mProjection = LocalImage.PROJECTION;
mItemPath = LocalImage.ITEM_PATH;
} else {
mWhereClause = VideoColumns.BUCKET_ID + " = ?";
mOrderClause = VideoColumns.DATE_TAKEN + " DESC, "
+ VideoColumns._ID + " DESC";
mBaseUri = Video.Media.EXTERNAL_CONTENT_URI;
mProjection = LocalVideo.PROJECTION;
mItemPath = LocalVideo.ITEM_PATH;
}
/// M: [FEATURE.ADD] @{
exInitializeWhereClause();
/// @}
//这里的uri是用于监听媒体数据库变化的。而不是用于获取数据
//Gionee chenjs 2017-03-01 add for Selfie album begin
Uri[] uris;
if (com.gionee.gallery3d.util.Utils.isSupportedSelfieFile()) {
uris = new Uri[]{mBaseUri, StoryContract.OtherFolder.OTHER_FOLDER_URI};
} else {
uris = new Uri[]{mBaseUri};
}
//Gionee chenjs 2017-03-01 add for Selfie album end
//Gionee <zhangjinbiao> modify for <150516> begin
// mNotifier = new ChangeNotifier(this, mBaseUri, application);
//如果是Selfies文件夹，还需监听多一个uri
mNotifier = new ChangeNotifier(this, uris, application);
//Gionee <zhangjinbiao> modify for <150516> end
}
获取MediaItem的入口函数LocalAlbum#getMediaItem（）
@Override
public ArrayList<MediaItem> getMediaItem(int start, int count) {
DataManager dataManager = mApplication.getDataManager();
//结合构造时初始化的uri和该方法指定的范围构造一个新的uri
Uri uri = mBaseUri.buildUpon()
.appendQueryParameter("limit", start + "," + count).build();
ArrayList<MediaItem> list = new ArrayList<MediaItem>();
GalleryUtils.assertNotInRenderThread();
/// M: [DEBUG.ADD] @{
TraceHelper.traceBegin(">>>>LocalAlbum-query");
/// @}
//从上面的分析可以看到，bucketid是从Android多媒体数据库中查询出来，而selfies文件夹的bucketid在多媒体数据库是没有对应的，是在
//BucketHelper#loadBucketEntriesFromFilesTable()中根据是否有自拍照片和是否隐藏来考虑是否加入这个对应selfies的bucketid的。
//所以在获取构造MediaItem需要的信息使，其他bucketid对应的集合是可以根据bucketid通过数据查到对应的信息，而selfies则需要间接的去获取
//需要通过数据库中查询有自拍照片，而且必须是DCIM/Camera路径的。
//Gionee chenjs 2017-03-01 add for Selfie album begin
Cursor cursor = null;
if (com.gionee.gallery3d.util.Utils.isSupportedSelfieFile()) {
//mark if selfie folder has been hided;
boolean[] hasHide = {false, false};
//查询图库自带的数据库，Camera文件夹的隐藏情况，如果隐藏了，则selfies就不显示了
cursor = mApplication.getContentResolver().query(StoryContract.OtherFolder.OTHER_FOLDER_URI,
new String[]{StoryContract.OtherFolder.COLUMN_BUCKET_ID}, null, null, null);
if (cursor != null) {
while (cursor.moveToNext()) {
if (cursor.getInt(0) == MediaSetUtils.CAMERA_BUCKET_ID) {
hasHide[0] = true;
}
if (cursor.getInt(0) == com.gionee.gallery3d.util.MediaSetUtils.getExternalBucketID(mApplication.getAndroidContext())) {
hasHide[1] = true;
}
}
}
//bucketid为SELFIE_BUCKET_ID时走该if
if (mBucketId == MediaSetUtils.SELFIE_BUCKET_ID && mIsImage) {
//有且只有一个不隐藏的DCIM/Camera文件夹
if (!(hasHide[0] && hasHide[1]) && (hasHide[0] || hasHide[1])) {
try {
if (hasHide[0]) {
cursor = mResolver.query(uri, mProjection,
ImageColumns.DATA + " like? and " + "camera_id=?", new String[]{
"%" + Environment.getExternalStorageDirectory().toString()
+ "/DCIM/Camera" + "%", String.valueOf(1)}, mOrderClause);
} else if (com.gionee.gallery3d.util.MediaSetUtils.getExternalBucketID(mApplication.getAndroidContext()) != 0 && hasHide[1]) {
cursor = mResolver.query(uri, mProjection,
ImageColumns.DATA + " like? and " + "camera_id=?", new String[]{
"%" + com.gionee.gallery3d.util.MediaSetUtils.getExternalPath()
+ "/DCIM/Camera" + "%", String.valueOf(1)}, mOrderClause);
}
} catch (Exception e) {
// TODO: handle exception
}
ArrayList<Integer> ids = new ArrayList<>();
if (cursor != null) {//收集隐藏了的DCIM/Camera文件夹中的自拍照片的id。下面会过滤掉这些id，剩下其他存储器中DCIM/Camera文件夹中的自拍照片
while (cursor.moveToNext()) {
ids.add(cursor.getInt(0)); //id must at the first column
}
}
StringBuilder whereClause = new StringBuilder();
int length = ids.size();
if (length > 0) {
//构造过滤隐藏的DCIM/Camera文件夹的自拍照片的查询子句
whereClause.append(ImageColumns._ID + " not in (");
for (int i = 0; i < length; i++) {
whereClause.append(String.valueOf(ids.get(i)));
if (i == (length -1)) {
whereClause.append(")");
} else {
whereClause.append(",");
}
}
whereClause.append(" and ");
}
//路径中含/DCIM/Camera且camera_id=1（前置摄像头拍出来的）
whereClause.append("(");
whereClause.append(ImageColumns.DATA + " like ");
whereClause.append("'%/DCIM/Camera%'");
whereClause.append(" and " + "camera_id=1");
whereClause.append(")");
cursor = mResolver.query(
uri, mProjection,
whereClause.toString(),
null, mOrderClause);
} else {
//不符合有且只有一个不隐藏的DCIM/Camera文件夹的，就来到这里
try {
cursor = mResolver.query(
uri,
mProjection,
ImageColumns.DATA + " like? and " + "camera_id=?",
new String[] { "%"
+ "/DCIM/Camera" + "%", String.valueOf(1) },
mOrderClause);
} catch (Exception e) {
// TODO: handle exception
}
}
} else {
//如果bucketid不是对应selfies的，就走这里。直接用传入的bucketid去查多媒体数据库
//Gionee <GN_Oversea_Bug> <rench> <20170428> <modify> for 126488 beign
try {
cursor = mResolver.query(
uri, mProjection, mWhereClause,
new String[]{String.valueOf(mBucketId)},
mOrderClause);
} catch (Exception e) {
// TODO: handle exception
}
//Gionee <GN_Oversea_Bug> <rench> <20170428> <modify> for 126488 end
}
} else {
//如果不支持selfies文件夹的项目，直接走这里
cursor = mResolver.query(
uri, mProjection, mWhereClause,
new String[]{String.valueOf(mBucketId)},
mOrderClause);
}
//Gionee chenjs 2017-03-01 add for Selfie album end
/// M: [DEBUG.ADD] @{
TraceHelper.traceEnd();
/// @}
if (cursor == null) {
Log.w(TAG, "query fail: " + uri);
return list;
}
try {
//构造MediaItem的最后一步。使用cursor去初始化MediaItem
while (cursor.moveToNext()) {
int id = cursor.getInt(0); // _id must be in the first column
Path childPath = mItemPath.getChild(id);
/// M: [DEBUG.ADD] @{
TraceHelper.traceBegin(">>>>LocalAlbum-loadOrUpdateItem");
/// @}
MediaItem item = loadOrUpdateItem(childPath, cursor,
dataManager, mApplication, mIsImage);
/// M: [DEBUG.ADD] @{
TraceHelper.traceEnd();
/// @}
list.add(item);
}
} finally {
cursor.close();
}
return list;
}
分析LocalOtherAlbumSet从初始化album
看LocalShowAlbumSet构造方法中的这句：mLocalOtherAllMediaSet = dataManager.getMediaSet("/local/other/all");
LocalShowAlbumSet#getSubMediaSet(int index)
@Override
public MediaSet getSubMediaSet(int index) {
int localAllCount = mLocalAllMediaSet.getSubMediaSetCount();
int localOtherAllCount = mLocalOtherAllMediaSet.getSubMediaSetCount();
//如果没有的话，mLocalAllMediaSet中所有album都是可以显示，进入下面的if
if (localOtherAllCount == 0 && index < localAllCount) {
return mLocalAllMediaSet.getSubMediaSet(index);
}
int count = -1;
//如果有些隐藏的则要执行下面的代码
for (int i = 0; i < localAllCount; i++) {
MediaSet mediaSet = mLocalAllMediaSet.getSubMediaSet(i);
int bucketId = ((LocalMergeAlbum) mediaSet).getBucketId();
if (isShowBucketId(bucketId)) {
count++;
}
if (count == index) {
return mediaSet;
}
}
return null;
}
可以看到mLocalOtherAllMediaSet在LocalShowAlbumSet中的价值只是看下是否有隐藏的文件夹
加入selfies，在其他地方加入的代码解析
在StoryAlbumSet加入的代码
private ArrayList<LocalMediaItem> refreshExistingItems(JobContext jc) {
String whereClause = getWhereClause();
final ArrayList<LocalMediaItem> itemsToMakeStory = new ArrayList<>();
DataManager dataManager = mApp.getDataManager();
Cursor imageCursor = mApp.getContentResolver().query(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI, LocalImage.PROJECTION, whereClause, null,
MediaStore.Images.ImageColumns.DATE_TAKEN + " DESC, "
+ MediaStore.Images.ImageColumns._ID + " DESC");
//加入selfies相册隐藏时，过滤掉。因为selfies比较特别，不是一个实际存在的文件夹。
//Gionee chenjs 2017-03-01 add for Selfie album begin
final ArrayList<Integer> hideId = new ArrayList<>();
if (Utils.isSupportedSelfieFile()) {
boolean hasHide = false;
Cursor cursor = mApp.getContentResolver().query(StoryContract.OtherFolder.OTHER_FOLDER_URI,
new String[]{StoryContract.OtherFolder.COLUMN_BUCKET_ID}, null, null, null);
if (cursor != null) {
while (cursor.moveToNext()) {
if (cursor.getInt(0) == MediaSetUtils.SELFIE_BUCKET_ID) {
hasHide = true;
break;
}
}
}
if (hasHide) {
cursor = mApp.getContentResolver().query(Images.Media.EXTERNAL_CONTENT_URI,
LocalImage.PROJECTION,
//Gionee <GN_Oversea_Bug> <rench> <20170316> <modify> for 84148 beign
//ImageColumns.DATA + " like? and " + "camera_id=?", new String[]{"%"+Environment.getExternalStorageDirectory().toString()
ImageColumns.DATA + " like? and " + "camera_id=?", new String[]{"%"
//Gionee <GN_Oversea_Bug> <rench> <20170316> <modify> for 84148 end
+ "/DCIM/Camera" + "%", String.valueOf(1)}, null);
}
if (cursor != null) {
while (cursor.moveToNext()) {
hideId.add(cursor.getInt(0));
}
cursor.close();
}
}
//Gionee chenjs 2017-03-01 add for Selfie album end
int imageCount = 0;
if (imageCursor != null) {
try {
imageCount = imageCursor.getCount();
if (imageCursor.getCount() > 0) {
itemsToMakeStory.ensureCapacity(imageCount);
while (imageCursor.moveToNext()) {
if (jc.isCancelled()) {
return null;
}
int id = imageCursor.getInt(0); // _id must be in the first column
Path childPath = mImageBasePath.getChild(id);
MediaItem item = LocalAlbum.loadOrUpdateItem(childPath, imageCursor,
dataManager, mApp, true);
//Gionee chenjs 2017-03-01 add for Selfie album begin
if (Utils.isSupportedSelfieFile()) {
if (!hideId.contains(item.getId())) {
itemsToMakeStory.add((LocalMediaItem) item);
}
//Gionee chenjs 2017-03-01 add for Selfie album end
} else {
itemsToMakeStory.add((LocalMediaItem) item);
}
}
}
} finally {
Utils.closeSilently(imageCursor);
}
}
if (jc.isCancelled()) {
return null;
}
Cursor videoCursor = mApp.getContentResolver().query(
MediaStore.Video.Media.EXTERNAL_CONTENT_URI, LocalVideo.PROJECTION, whereClause, null,
MediaStore.Video.VideoColumns.DATE_TAKEN + " DESC, "
+ MediaStore.Video.VideoColumns._ID + " DESC");
if (videoCursor != null) {
try {
int videoCount = videoCursor.getCount();
if (videoCount > 0) {
itemsToMakeStory.ensureCapacity(imageCount + videoCount);
while (videoCursor.moveToNext()) {
if (jc.isCancelled()) {
return null;
}
int id = videoCursor.getInt(0); // _id must be in the first column
Path childPath = mVideoBasePath.getChild(id);
MediaItem item = LocalAlbum.loadOrUpdateItem(childPath, videoCursor,
dataManager, mApp, false);
itemsToMakeStory.add((LocalMediaItem) item);
}
}
} finally {
Utils.closeSilently(videoCursor);
}
}
return itemsToMakeStory;
}
还需在TrashMediaItem，TrashMediaInfo，TrashDB中加入camera_id字段相关的代码
在ThemeBitmapLoader，StoryCoverALbum中加入相关代码。
在ActionMdoeHandler#computeMenuOptions（）中加入以下代码，指定selfies文件夹不允许删除，重命名，移到其他专辑操作。
//Gionee chenjs 2017-03-01 add for Selfie album begin
if (Utils.isSupportedSelfieFile()) {
if (setPaths != null) {
for (Path path : setPaths) {
if (path.toString().equals("/local/all/" + MediaSetUtils.SELFIE_BUCKET_ID)) {
operation &= ~MediaObject.SUPPORT_DELETE;
operation &= ~MediaObject.SUPPORT_RENAME_FOLDER;
operation &= ~MediaObject.SUPPORT_MOVE_TO_OTHER;
}
}
}
}
//Gionee chenjs 2017-03-01 add for Selfie album end
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