FATAL EXCEPTION: main Caused by: java.lang.NullPointerException at Home.java:35

Question

I'm getting an error stating FATAL EXCEPTION: main Caused by: java.lang.NullPointerException at Home.java:35 when attempting to create a thumbnail from a MP4 using the following example: How to get image from video file

Line 35 is thumb.getWidth(), thumb.getHeight(), matrix, true);

The MP4 URL is valid - so I'm not sure exactly why this is happening.

Source:

public class Home extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.home);


        ImageView videoview;
        videoview = (ImageView) findViewById(R.id.myImageView);
         Bitmap thumb = ThumbnailUtils.createVideoThumbnail("http://techslides.com/demos/sample-videos/small.mp4",   MediaStore.Images.Thumbnails.MINI_KIND);
         Matrix matrix = new Matrix();
         Bitmap bmThumbnail = Bitmap.createBitmap(thumb, 0, 0,
         thumb.getWidth(), thumb.getHeight(), matrix, true);
         videoview.setImageBitmap(bmThumbnail);



    }
}

from your code viewView can only be null, as suggested by eclise and illustrated by the exception. now, you know where the crash is, you know why, and you know which variable is the issue. what is your question ? — njzk2, Jan 31 '14 at 21:51
I don't understand...the edit didn't add anything, it just fixed the formatting and removed relevant information. (Note: I didn't vote to close as a dupe, I voted to close as "insufficient information to diagnose the problem") — Adi Inbar, Feb 01 '14 at 21:47

score 4 · Answer 1 · answered Jan 31 '14 at 21:51

4

You didn't initialize videoview.

You can do that like this:

videoview = (ImageView) findViewById(R.id.myImageView)

answered Jan 31 '14 at 21:51

Ahmad

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Does this look correct? I tried it and it's still force closing: http://pastebin.com/EFUaSD2f – user3254794 Jan 31 '14 at 21:57
Is your `ImageView` 's Id really `myImageView`? – Ahmad Jan 31 '14 at 21:58
Yes: – user3254794 Jan 31 '14 at 21:59
http://pastebin.com/YdbMrHiu – user3254794 Jan 31 '14 at 22:01
You've still got this line `ImageView videoview = null;` in there. – Ahmad Jan 31 '14 at 22:04
I removed it - still crashing on the same line: http://pastebin.com/duNtG0W3 – user3254794 Jan 31 '14 at 22:06
thumb.getWidth(), thumb.getHeight(), matrix, true); – user3254794 Jan 31 '14 at 22:10
Any ideas? I'm stumped... – user3254794 Jan 31 '14 at 22:18
Hmm what are you trying to do with the bitmap? The bitmap creation is throwing an exception. – Ahmad Jan 31 '14 at 22:19
I'm trying to create a thumbnail from a video P.S. when debugging thumb is null for some reason - any idea why? – user3254794 Jan 31 '14 at 22:22
`ThumbnailUtils.createVideoThumbnail()` takes a file path to a video on the device's storage as a parameter. You are passing in a URL to a video. – Ahmad Jan 31 '14 at 22:25
Any idea what I could/should do instead? (I need them stored online) – user3254794 Jan 31 '14 at 22:27
I would create a thumbnail on the server side and fetch the image on the client side(in your android app) – Ahmad Jan 31 '14 at 22:28
Sadly - that is not an option for this project. – user3254794 Jan 31 '14 at 22:31
Hmm sorry I don't think that's possible then (afaik), you would have to download the video and then create create a thumbnail. There might be another way to do that, but I'm not sure. – Ahmad Jan 31 '14 at 22:35

FATAL EXCEPTION: main Caused by: java.lang.NullPointerException at Home.java:35

Source:

1 Answers1