Gallery 打开gif图像

packages/apps/SnapdragonGallery/src/com/android/gallery3d/app/

GalleryActivity.java

//打开显示view

//碰到过类似问题，如果从安全角度来看，这本不算gallery的一个bug, 它主要关系到是否允许用户通过滑动来查看其它照片的问题

startViewAction(){

Path itemPath = dm.findPathByUri(uri, contentType);
Path albumPath = dm.getDefaultSetOf(itemPath);

                boolean singleItemOnly = (albumPath == null) || intent.getBooleanExtra("SingleItemOnly", false);
                if (!singleItemOnly) {
                    data.putString(PhotoPage.KEY_MEDIA_SET_PATH, albumPath.toString());
                }

getStateManager().startState(SinglePhotoPage.class, data);

}

DataManager.java

findPathByUri(){

for (MediaSource source : mSourceMap.values()) {//主要有两个LocalSource 和 UriSource

}

getDefaultSetOf(){

MediaSource source = mSourceMap.get(item.getPrefix());//Prefix 为local 和 uri

}

UriSource UriImage

LocalSource LocalAlbumSet LocalAlbum LocalImage LocalVideo

UriImage.java

//DrmHelper DRM：数字版权管理

    @Override
    public Job<Bitmap> requestImage(int type) {
        return new BitmapJob(type);
    }

    @Override
    public Job<BitmapRegionDecoder> requestLargeImage() {
        return new RegionDecoderJob();
    }

startViewAction. uri=content://media/external/images/media/215contentType=image/gif
GalleryActivity: startViewAction. (itemPath )=/local/image/item/215
GalleryActivity: startViewAction. (albumPath )=/local/all/540528482

startViewAction. uri=content://com.android.providers.media.documents/document/image%3A240contentType=image/gif
GalleryActivity: startViewAction. (itemPath )=/uri/content%3A%2F%2Fcom.android.providers.media.documents%2Fdocument%2Fimage%253A240/image%2Fgif
GalleryActivity: startViewAction. (albumPath == null)=true

PhotoPage.java

onCreate(){

           mMenuExecutor = new MenuExecutor(mActivity, mSelectionManager);
        mPhotoView = new PhotoView(mActivity);//显示的view
        mPhotoView.setListener(this);

mSetPathString = data.getString(KEY_MEDIA_SET_PATH);

(mSetPathString != null){ //打开动态（原图） PhotoDataAdapter

             PhotoDataAdapter pda = new PhotoDataAdapter(
                    mActivity, mPhotoView, mMediaSet, itemPath, mCurrentIndex,
                    mAppBridge == null ? -1 : 0,
                    mAppBridge == null ? false : mAppBridge.isPanorama(),
                    mAppBridge == null ? false : mAppBridge.isStaticCamera());
            mModel = pda;
            mPhotoView.setModel(mModel);

          }else {// Get default media set by the URI //否则，就是缩列图 (只有一帧) SinglePhotoDataAdapter
            Log.w(TAG, "Get default media set by the URI ");
            MediaItem mediaItem = (MediaItem)
                    mActivity.getDataManager().getMediaObject(itemPath);
            mModel = new SinglePhotoDataAdapter(mActivity, mPhotoView, mediaItem);
            mPhotoView.setModel(mModel);
            updateCurrentPhoto(mediaItem);

}

SinglePhotoDataAdapter.java

onDecodeLargeComplete();//原图显示

onDecodeThumbComplete();//缩列图显示

Gallery 打开gif图像

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