如果我们需要快速提取图片和视频缩略图可以直接访问 android.provider.MediaStore.Images.Thumbnails 和android.provider.MediaStore.Video.Thumbnails这两个数据库，即可查询出来缩略图 。

如何判断文件呢? 可以通过Cursor遍历数据库，对比INTERNAL_CONTENT_URI字段的值，这是一个Uri，这里保存着Android手机SD卡上的多媒体文件完整路径。

[java]

Uri originalUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;

//若为视频则为MediaStore.Video.Media.EXTERNAL_CONTENT_URI;

ContentResolver cr = this.getContentResolver();

Cursor cursor = cr.query(originalUri, null, null, null, null);

if (cursor == null) {

return;

}

for (cursor.moveToFirst();!cursor.isAfterLast(); cursor.moveToNext()) {

long thumbNailsId = cursor.getLong(cursor .getColumnIndex("_ID"));

Bitmap bitmap = MediaStore.Images.Thumbnails.getThumbnail(cr,

thumbNailsId, Video.Thumbnails.MICRO_KIND, null);

//若为视频则为

// Bitmap bitmap = MediaStore.Video.Thumbnails.getThumbnail(cr,

// thumbNailsId, Video.Thumbnails.MICRO_KIND, null);

return bitmap;

}

Uri originalUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;

//若为视频则为MediaStore.Video.Media.EXTERNAL_CONTENT_URI;

ContentResolver cr = this.getContentResolver();

Cursor cursor = cr.query(originalUri, null, null, null, null);

if (cursor == null) {

return;

}

for (cursor.moveToFirst();!cursor.isAfterLast(); cursor.moveToNext()) {

long thumbNailsId = cursor.getLong(cursor .getColumnIndex("_ID"));

Bitmap bitmap = MediaStore.Images.Thumbnails.getThumbnail(cr,

thumbNailsId, Video.Thumbnails.MICRO_KIND, null);

//若为视频则为

// Bitmap bitmap = MediaStore.Video.Thumbnails.getThumbnail(cr,

// thumbNailsId, Video.Thumbnails.MICRO_KIND, null);

return bitmap;

}

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本文标题：Android获取SD卡上图片和视频的缩略图，责任编辑：宏鹏，来源：武汉北大青鸟鲁广校区栏目，于05-15发布于北大青鸟鲁广校区。Android获取SD卡上图片和视频的缩略图。