如何从 Android Mediastore 加载 .gif 图像

Question

我需要将几张 gif 图片加载到自定义画廊视图中。使用 mediastore 只能为我提供 png/jpg 图像类型。经过几个小时的谷歌搜索，我仍然找不到答案..

我用来从媒体存储加载图像的代码是：

    final String sortOrder = mPreferences.getSortMode();

    final Uri uri = android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI;

    String[] projection = { MediaStore.MediaColumns.DATA,
            MediaStore.Images.Media.BUCKET_ID, MediaStore.Images.Media.DISPLAY_NAME };

    final Cursor cursor = mContext.getContentResolver().query(uri, projection, null,
            null, sortOrder);

感谢！

Answer 1

确保包含 gif 的目录已被媒体商店扫描，以便通过内容提供商检索其内容。

查看此 link 了解更多信息： http://www.grokkingandroid.com/adding-files-to-androids-media-library-using-the-mediascanner/

Answer 2

Try This, It may help you.

使用String mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension("gif");

的实例

String mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension("pdf");

来自这个答案

Answer 3

这给出了完美的结果。

private static final String[] COLUMNS_OF_INTEREST = new String[]
{
        MediaStore.Video.Media._ID,
        MediaStore.Video.Media.DATA,
        MediaStore.Video.Media.DISPLAY_NAME,
        MediaStore.Video.Media.SIZE,
        MediaStore.Video.Media.WIDTH,
        MediaStore.Video.Media.HEIGHT,
        MediaStore.Video.Media.DATE_ADDED
};

public void printGifUri(Context context)
{
    ContentResolver cr = context.getContentResolver();

    String selection = MediaStore.Images.Media.MIME_TYPE + "=?";
    String mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension("gif");
    String[] selectionArgsPdf = new String[]{ mimeType };

    Cursor gifCursor = cr.query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, COLUMNS_OF_INTEREST, selection,selectionArgsPdf,
            MediaStore.Images.Media.DATE_ADDED + " DESC");

    gifCursor.moveToFirst();
    int columnIndexUri = gifCursor.getColumnIndexOrThrow(MediaStore.Video.Media.DATA);
    for (int i = 0; i < gifCursor.getCount(); i++)
        Log.d("gif file uri -> ", gifCursor.getString(columnIndexUri));
}

我更喜欢使用 Android LoaderManager.LoaderCallbacks，因为这会在后台加载光标，完成后我们会得到结果。

public class GifListManagerImpl implements LoaderManager.LoaderCallbacks<Cursor> {

Context mContext;

private static final String[] COLUMNS_OF_INTEREST = new String[]
{
        MediaStore.Video.Media._ID,
        MediaStore.Video.Media.DATA,
        MediaStore.Video.Media.DISPLAY_NAME,
        MediaStore.Video.Media.SIZE,
        MediaStore.Video.Media.WIDTH,
        MediaStore.Video.Media.HEIGHT,
        MediaStore.Video.Media.DATE_ADDED
};

public  GifListManagerImpl(Context context)
{
    mContext = context;
}

@Override
public Loader<Cursor> onCreateLoader(int i, Bundle bundle) {

    String selection = MediaStore.Images.Media.MIME_TYPE + "=?";
    String mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension("gif");
    String[] selectionArgsPdf = new String[]{ mimeType };
    return new CursorLoader(mContext, MediaStore.Images.Media.EXTERNAL_CONTENT_URI, COLUMNS_OF_INTEREST, selection,selectionArgsPdf,
            MediaStore.Images.Media.DATE_ADDED + " DESC");
}

@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) {
    cursor.moveToFirst();
    int columnIndexUri = cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DATA);
    for (int i = 0; i < cursor.getCount(); i++)
        Log.d("gif file uri -> ", cursor.getString(columnIndexUri));

}

@Override
public void onLoaderReset(Loader<Cursor> loader) {

}

如何从 Android Mediastore 加载 .gif 图像

How does one load .gif images from the Android Mediastore

android

image

gif

mediastore