android 獲取視頻，圖片縮略圖

1、獲取視頻縮略圖有兩個方法(1)通過內容提供器來獲取(2)人為創建縮略圖

(1)缺點就是必須更新媒體庫才能看到最新的視頻的縮略圖

[java]
/** 
     * @param context 
     * @param cr
     * @param Videopath
     * @return 
     */ 
    public static Bitmap getVideoThumbnail(Context context, ContentResolver cr, String Videopath) {  
            ContentResolver testcr = context.getContentResolver();  
            String[] projection = { MediaStore.Video.Media.DATA, MediaStore.Video.Media._ID, };  
            String whereClause = MediaStore.Video.Media.DATA + " = '" + Videopath + "'";  
            Cursor cursor = testcr.query(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, projection, whereClause,  
                            null, null);  
            int _id = 0;  
            String videoPath = "";  
            if (cursor == null || cursor.getCount() == 0) {  
                    return null;  
            }  
            if (cursor.moveToFirst()) {  
 
                    int _idColumn = cursor.getColumnIndex(MediaStore.Video.Media._ID);  
                    int _dataColumn = cursor.getColumnIndex(MediaStore.Video.Media.DATA);  
                    do {  
                            _id = cursor.getInt(_idColumn);  
                            videoPath = cursor.getString(_dataColumn);  
                    } while (cursor.moveToNext());  
            }  
            cursor.close(); 
            BitmapFactory.Options options = new BitmapFactory.Options();  
            options.inDither = false;  
            options.inPreferredConfig = Bitmap.Config.RGB_565;  
            Bitmap bitmap = MediaStore.Video.Thumbnails.getThumbnail(cr, _id, Images.Thumbnails.MINI_KIND,  
                            options);  
            return bitmap;  
    } 

/**
     * @param context
     * @param cr
     * @param Videopath
     * @return
     */
    public static Bitmap getVideoThumbnail(Context context, ContentResolver cr, String Videopath) {
            ContentResolver testcr = context.getContentResolver();
            String[] projection = { MediaStore.Video.Media.DATA, MediaStore.Video.Media._ID, };
            String whereClause = MediaStore.Video.Media.DATA + " = '" + Videopath + "'";
            Cursor cursor = testcr.query(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, projection, whereClause,
                            null, null);
            int _id = 0;
            String videoPath = "";
            if (cursor == null || cursor.getCount() == 0) {
                    return null;
            }
            if (cursor.moveToFirst()) {

                    int _idColumn = cursor.getColumnIndex(MediaStore.Video.Media._ID);
                    int _dataColumn = cursor.getColumnIndex(MediaStore.Video.Media.DATA);
                    do {
                            _id = cursor.getInt(_idColumn);
                            videoPath = cursor.getString(_dataColumn);
                    } while (cursor.moveToNext());
            }
            cursor.close();
            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inDither = false;
            options.inPreferredConfig = Bitmap.Config.RGB_565;
            Bitmap bitmap = MediaStore.Video.Thumbnails.getThumbnail(cr, _id, Images.Thumbnails.MINI_KIND,
                            options);
            return bitmap;
    }(2)人為創建縮略圖要耗費一點時間

[java]
/**
    * 獲取視頻縮略圖
    * @param videoPath
    * @param width
    * @param height
    * @param kind
    * @return
    */ 
   private Bitmap getVideoThumbnail(String videoPath, int width , int height, int kind){ 
    Bitmap bitmap = null; 
    bitmap = ThumbnailUtils.createVideoThumbnail(videoPath, kind); 
    bitmap = ThumbnailUtils.extractThumbnail(bitmap, width, height, ThumbnailUtils.OPTIONS_RECYCLE_INPUT); 
    return bitmap; 
   } 

 /**
     * 獲取視頻縮略圖
     * @param videoPath
     * @param width
     * @param height
     * @param kind
     * @return
     */
    private Bitmap getVideoThumbnail(String videoPath, int width , int height, int kind){
  Bitmap bitmap = null;
  bitmap = ThumbnailUtils.createVideoThumbnail(videoPath, kind);
  bitmap = ThumbnailUtils.extractThumbnail(bitmap, width, height, ThumbnailUtils.OPTIONS_RECYCLE_INPUT);
  return bitmap;
    }
2、圖片縮略圖

[java]
/** 
    *  
    * @param context 
    * @param cr
    * @param Imagepath 
    * @return 
    */ 
   public static Bitmap getImageThumbnail(Context context, ContentResolver cr, String Imagepath) {  
           ContentResolver testcr = context.getContentResolver();  
           String[] projection = { MediaStore.Images.Media.DATA, MediaStore.Images.Media._ID, };  
           String whereClause = MediaStore.Images.Media.DATA + " = '" + Imagepath + "'";  
           Cursor cursor = testcr.query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, projection, whereClause,  
                           null, null);  
           int _id = 0;  
           String imagePath = "";  
           if (cursor == null || cursor.getCount() == 0) {  
                   return null;  
           }  
           if (cursor.moveToFirst()) {  
 
                   int _idColumn = cursor.getColumnIndex(MediaStore.Images.Media._ID);  
                   int _dataColumn = cursor.getColumnIndex(MediaStore.Images.Media.DATA);  
 
                   do {  
                           _id = cursor.getInt(_idColumn);  
                           imagePath = cursor.getString(_dataColumn);  
                   } while (cursor.moveToNext());  
           }  
           cursor.close(); 
           BitmapFactory.Options options = new BitmapFactory.Options();  
           options.inDither = false;  
           options.inPreferredConfig = Bitmap.Config.RGB_565;  
           Bitmap bitmap = MediaStore.Images.Thumbnails.getThumbnail(cr, _id, Images.Thumbnails.MINI_KIND,  
                           options);  
           return bitmap;  
   } 

 /**
     * 
     * @param context
     * @param cr
     * @param Imagepath
     * @return
     */
    public static Bitmap getImageThumbnail(Context context, ContentResolver cr, String Imagepath) {
            ContentResolver testcr = context.getContentResolver();
            String[] projection = { MediaStore.Images.Media.DATA, MediaStore.Images.Media._ID, };
            String whereClause = MediaStore.Images.Media.DATA + " = '" + Imagepath + "'";
            Cursor cursor = testcr.query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, projection, whereClause,
                            null, null);
            int _id = 0;
            String imagePath = "";
            if (cursor == null || cursor.getCount() == 0) {
                    return null;
            }
            if (cursor.moveToFirst()) {

                    int _idColumn = cursor.getColumnIndex(MediaStore.Images.Media._ID);
                    int _dataColumn = cursor.getColumnIndex(MediaStore.Images.Media.DATA);

                    do {
                            _id = cursor.getInt(_idColumn);
                            imagePath = cursor.getString(_dataColumn);
                    } while (cursor.moveToNext());
            }
            cursor.close();
            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inDither = false;
            options.inPreferredConfig = Bitmap.Config.RGB_565;
            Bitmap bitmap = MediaStore.Images.Thumbnails.getThumbnail(cr, _id, Images.Thumbnails.MINI_KIND,
                            options);
            return bitmap;
    }