视频缩略图返回null

我从存储在我的SD卡中的视频创建缩略图，在网格视图中显示缩略图及其名称。在网格视图的项目选定事件上弹出一个对话框，并询问x，y，右下角位置，然后将其粘贴到主活动。我获得了视频文件，并尝试使用媒体存储创建缩略图，同时将缩略图作为位图进行检索，但位图为空。在网格视图中显示视频名称，我可以选择相应的缩略图，并且可以给位置设置缩略图到主要活动。问题是位图是空的，位图图像没有显示（显示的文本是视频名称）。有什么问题？我无法弄清楚？ Plz帮助我？我的代码如下。提前致谢。视频缩略图返回null

 if (f.isFile()) { 
     if (fName.endsWith(".mpg") 
    || fName.endsWith(".mov") 
    || fName.endsWith(".wmv") 
    || fName.endsWith(".rm") 
    || fName.endsWith(".mp4")) { 
    tv.setText(fName); 
    path = f.getAbsolutePath(); 
    System.out.println("Video file path=>"+path); 


thumb = ThumbnailUtils.createVideoThumbnail(f.getAbsolutePath(),MediaStore.Video.Thumbnails.MICRO_KIND); 


    if(thumb==null) 
     { 
     /**Every time it printing null**/ 
     System.out.println("Thumb is null"); 

     } 
     iv.setImageBitmap(thumb);

来源

2012-11-09 Sunny

从ThumbnailUtils.createVideoThumbnail文档：May return null if the video is corrupt or the format is not supported.

默认情况下，几乎所有支持的格式是MP4和3GP。请参阅此处：http://developer.android.com/guide/appendix/media-formats.html了解默认支持的媒体格式的完整列表。

来源

2013-07-22 15:17:34 kolobok

有没有办法从.mov文件中获得缩略图？例如说在wowza服务器上的视频？ –

但是在图库中我可以看到缩略图; - （所以视频没有损坏或其他 –

-1

Try this code. It is getting the thumbnail of videos from urls. instead of pass the path of sd card .it will help you . Dont forgot to add internet permission in manifest file. 
public class VideoThumbnailActivity extends Activity { 

    public static final String Downloader = null; 
    static String uri1="http://daily3gp.com/vids/lucky_guy.3gp"; 
    static String uri2="http://daily3gp.com/vids/reporter_hit_by_plane.3gp"; 
    static String uri3="http://daily3gp.com/vids/motorcycle_wipesout_explodes.3gp"; 
    static String uri4="http://commonsware.com/misc/test2.3gp"; 
    public static String uri_array[]={uri1,uri2,uri3,uri4,uri1,uri2,uri3,uri4,uri1,uri2,uri3,uri4}; 


    ImageView imageView; 
    String url; 
    Gallery ga1,ga2; 

    /** Called when the activity is first created. */ 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     imageView = (ImageView)findViewById(R.id.imageView); 
     ga1 = (Gallery)findViewById(R.id.gallery1); 
     ga1.setAdapter(new ImageAdapter(getApplicationContext())); 
     imageView.setImageBitmap(ThumbnailUtils.createVideoThumbnail(uri_array[0], MediaStore.Video.Thumbnails.FULL_SCREEN_KIND)); 

     //on click event on gallery 
     ga1.setOnItemClickListener(new OnItemClickListener() { 

      @Override 
      public void onItemClick(AdapterView<?> arg0, View view, final int position,long arg3) { 
      imageView.setImageBitmap(ThumbnailUtils.createVideoThumbnail(uri_array[position], MediaStore.Video.Thumbnails.FULL_SCREEN_KIND)); 

      //on click event on imageview to play video 
      imageView.setOnClickListener(new OnClickListener() { 

          @Override 
          public void onClick(View view) { 
           // TODO Auto-generated method stub 
           Intent intent = new Intent(getApplicationContext(),PlayActivity.class); 
           intent.putExtra("path",uri_array[position]); 
           startActivity(intent); 
          } 
         }); 

         } 

       }); 

      } 

      public class ImageAdapter extends BaseAdapter { 

       private Context ctx; 
       int imageBackground; 

       public ImageAdapter(Context c) { 
        ctx = c; 
        TypedArray ta = obtainStyledAttributes(R.styleable.Gallery1); 
        imageBackground = ta.getResourceId(R.styleable.Gallery1_android_galleryItemBackground, 1); 
        ta.recycle(); 
       } 

       @Override 
       public int getCount() { 

        return uri_array.length; 

       } 

       @Override 
       public Object getItem(int arg0) { 

        return arg0; 
       } 

       @Override 
       public long getItemId(int arg0) { 

        return arg0; 
       } 

       @Override 
       public View getView(int position, View view, ViewGroup arg2) { 

        ImageView iv = new ImageView(ctx); 
        Bitmap curThumb = null; 
        curThumb = ThumbnailUtils.createVideoThumbnail(uri_array[position],MediaStore.Video.Thumbnails.FULL_SCREEN_KIND); 
        iv.setImageBitmap(curThumb); 
        iv.setScaleType(ImageView.ScaleType.FIT_XY); 
        iv.setLayoutParams(new Gallery.LayoutParams(150,120)); 
        iv.setBackgroundResource(imageBackground); 
        return iv; 
      } 
     }

让我知道你的问题得到解决或没有。

来源

2012-11-09 07:01:31

我想从SD卡缩略图..无论如何让我检查... – Sunny

检查从SD卡thumnails下面的答案链接 –

好吧，让我检查.. – Sunny

如果您从SD卡视频创建缩略图，则会创建ThumbnailUtils.createVideoThumbnail，否则使用光标。

See this example。

来源

2013-10-13 20:34:32 kingfahad

视频缩略图返回null

回答

相关问题