Get Video Thumbnail from Uri

问题

I want to select a video from my Gallery. It's working fine. But now I want to display a Bitmap, as a thumbnail.I tired this code it's not working, it always says: NullPointerException

Bitmap bitmap2 = ThumbnailUtils.createVideoThumbnail(uri.getPath, MediaStore.Video.Thumbnails.MICRO_KIND);

This is all in an onActivityResult.

How can I get the Bitmap from the video Uri??

Thanks for your help

回答1:

in onActivityResult

String[] filePathColumn = {MediaStore.Images.Media.DATA};
Cursor cursor = context.getContentResolver().query(uri, filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String picturePath = cursor.getString(columnIndex);
cursor.close();

Bitmap bitmap = ThumbnailUtils.createVideoThumbnail(picturePath, MediaStore.Video.Thumbnails.MICRO_KIND);

Edit

Kotlin version

val filePathColumn = arrayOf(MediaStore.Images.Media.DATA)
val cursor = context.contentResolver.query(uri, filePathColumn, null, null, null)
cursor.moveToFirst()

val columnIndex = cursor.getColumnIndex(filePathColumn[0])
val picturePath = cursor.getString(columnIndex)
cursor.close()

val bitmap = ThumbnailUtils.createVideoThumbnail(picturePath, MediaStore.Video.Thumbnails.MICRO_KIND)

回答2:

In the latest API 24, you may face some issues if you stick with an approach in the accepted answer.

for example in this line int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); sometimes I got W/System.err: java.lang.IllegalArgumentException: column '_data' does not exist error message.

also in the latest API, you may get SecurityException if you deal with widgets or shared content. Keep that in mind.

As for the video thumbnail from Uri - I use an approach which utilizes MediaMetadataRetriever, thus you don't need to get String filePath:

            MediaMetadataRetriever mMMR = new MediaMetadataRetriever();
            mMMR.setDataSource(context, videoUri);
            bmp = mMMR.getFrameAtTime();

Hope this helps

回答3:

Try this one:

Bitmap bitmap2 = ThumbnailUtils.createVideoThumbnail( uri.getPath() , MediaStore.Images.Thumbnails.MINI_KIND );

回答4:

createVideoThumbnail() needs the file path, not the content uri.
The file path requires external read permissions.

If you're getting null responses, it may be from using the content uri (though the assumption in ThumbnailsUtils.java is of a corrupt video file). When I fixed that, then I was getting permissions errors.

I was able to get the file path from the content uri using the video's ID like this:

val selection = MediaStore.Video.Media._ID + " = $id"
val cursor = 
this.contentResolver.query(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, null, 
selection, null, null)

And then continue on with the cursor as in the other answers in SO.

Docs for contentResolver.query()

回答5:

Cursor c = MediaStore.Video.query(cr,uri, new String[]{
    MediaStore.Video.VideoColumns._ID,
    MediaStore.Video.VideoColumns.DATA});
if (c!=null){
    c.moveToFirst();
    int id = Integer.valueOf( c.getString(0) );
    c.close();
    BitmapFactory.Options options=new BitmapFactory.Options();
    options.inSampleSize = 1;
    try {
        return MediaStore.Video.Thumbnails.getThumbnail(cr, id, MediaStore.Video.Thumbnails.MINI_KIND, options);
    }catch (java.lang.SecurityException ex){
        ex.printStackTrace();
        //TODO: add create ThumbnailUtils.createVideoThumbnail
        return null;
    }
}

回答6:

This works for me:

Bitmap thumb = ThumbnailUtils.createVideoThumbnail(filePath, Thumbnails.MINI_KIND);

Using ThumbnailUtils, you can create thumbnail of two types.

MediaStore.Images.Thumbnails.MICRO_KIND - type will generate thumbnail of size 96 x 96. MediaStore.Images.Thumbnails.MINI_KIND - type will generate thumbnail of size 512 x 384.

来源：https://stackoverflow.com/questions/44109057/get-video-thumbnail-from-uri

标签

android

video

thumbnails

android-bitmap