Android-android 4.0怎么获取视频的缩略图？

Question

在2.X的系统上我能获取到视频缩略图，但是到了4.0却获取不到；是不是4.0获取的路径改了？
我以前获取的方法如下：

String[] fileds = {
                MediaStore.Video.Media.DATA, 
                MediaStore.Video.Media._ID, 
                MediaStore.Video.Media.DISPLAY_NAME 
            
        };
ContentResolver provider = m_context.getContentResolver();
        Cursor cursor = MediaStore.Video.query(provider, MediaStore.Video.Media.EXTERNAL_CONTENT_URI, fileds);
        cursor.moveToFirst();
        
        while(!cursor.isAfterLast())
        {
            String url = cursor.getString(0);//.substring(4);
            File file = new File(url);
            if((url.endsWith("mp4") || url.endsWith("3gp") || url.endsWith("flv")) && file.exists())
            {
                
            String  img =String.valueOf(cursor.getLong(1));
                
            
            }
            cursor.moveToNext();
        }
    Bitmap bitmap = MediaStore.Video.Thumbnails.getThumbnail(mContentProvider, Long.valueOf(img), MediaStore.Video.Thumbnails.MICRO_KIND, null);
    这个应用是基于2.1系统开发的

Answer 1

哈哈，这个我前几天刚刚弄过，代码，你应该懂得

private String[] mediaColumns = new String[] {
MediaStore.Video.Media.DATA, MediaStore.Video.Media.MIME_TYPE,
};
Cursor cursor = cursor = managedQuery(
MediaStore.Video.Media.EXTERNAL_CONTENT_URI, mediaColumns,
null, null, null);
if (cursor.moveToFirst()) {
do {
VideoInfo info = new VideoInfo();
info.filePath = cursor.getString(cursor
.getColumnIndexOrThrow(MediaStore.Video.Media.DATA));

info.mimeType = cursor.getString(cursor
.getColumnIndexOrThrow(MediaStore.Video.Media.MIME_TYPE));

Bitmap bitmap = ThumbnailUtils.createVideoThumbnail(
info.filePath, Thumbnails.MICRO_KIND);
int width = MainActivity.SCREEN_WIDTH / 4;
int height = width * 3 / 4;
Bitmap bitmap1 = ThumbnailUtils.extractThumbnail(bitmap,
width, height);
info.bitmap = bitmap1;
bitmap.recycle();
videoList.add(info);
} while (cursor.moveToNext());
}
cursor.close();

info.bitmap，就是用来存储视频截图的。
核心就是，利用ThumbnailUtils类，这个方法createVideoThumbnail只要接受路径 and 数据类型，就可以返回视频截图了。

Answer 2

static public Bitmap getVideoThumbnail(ContentResolver cr, String path) {
Bitmap bitmap = null;
BitmapFactory.Options options = new BitmapFactory.Options();
options.inDither = false;
options.inPreferredConfig = Bitmap.Config.RGB_565;
//select condition.
String whereClause = MediaStore.Video.Media.DATA + " = '"
+ path + "'";
Log.v(TAG, "where = " + whereClause);
//colection of results.
Cursor cursor = cr.query(MediaStore.Video.Media.EXTERNAL_CONTENT_URI,
new String[] { MediaStore.Video.Media._ID }, whereClause,
null, null);
Log.v(TAG, "cursor = " + cursor);
if (cursor == null || cursor.getCount() == 0) {
return ThumbnailUtils.createVideoThumbnail(path, MediaStore.Video.Thumbnails.MINI_KIND);
}
cursor.moveToFirst();
//image id in image table.
String videoId = cursor.getString(cursor
.getColumnIndex(MediaStore.Video.Media._ID));
Log.v(TAG, "videoId = " + videoId);
if (videoId == null) {
return ThumbnailUtils.createVideoThumbnail(path, MediaStore.Video.Thumbnails.MINI_KIND);
}
cursor.close();
long videoIdLong = Long.parseLong(videoId);
//via imageid get the bimap type thumbnail in thumbnail table.
bitmap = MediaStore.Video.Thumbnails.getThumbnail(cr, videoIdLong,
Images.Thumbnails.MICRO_KIND, options);
Log.v(TAG, "bitmap = " + bitmap);
return bitmap;
}

你试试，我的4.0.3上面试过可以的。