扫描指定目录下所有图片文件

String myparent=newPath.substring(0, newPath.lastIndexOf("/")).substring(newPath.substring(0, newPath.lastIndexOf("/")).lastIndexOf("/")+1);  
             Uri mImageUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;    
             ContentResolver mContentResolver =getContentResolver();    
             String[] projection = { MediaStore.Images.Media._ID, MediaStore.Images.Media.BUCKET_ID, MediaStore.Images.Media.BUCKET_DISPLAY_NAME, MediaStore.Images.Media.DISPLAY_NAME,  
                    MediaStore.Images.Media.DATA };  
             //只查询jpeg的图片    
             Cursor mCursor = mContentResolver.query(mImageUri, projection,    
                     MediaStore.Images.Media.BUCKET_DISPLAY_NAME + "=? and (" + MediaStore.Images.Media.MIME_TYPE + "=? or " + MediaStore.Images.Media.MIME_TYPE + "=?)",  
                     new String[]{myparent, "image/jpeg", "image/png"},null);    
             if (mCursor == null) {  
                Toast.makeText(getBaseContext(), "请装入SD卡， 或者图库没有照片", Toast.LENGTH_SHORT).show();  
            }  
             myimages.clear();  
            while (mCursor.moveToNext()) {  
                // 获取的图片的id  
                int id = mCursor.getInt(mCursor.getColumnIndex(MediaStore.Images.Media._ID));  
                // 图片所在当前目录id  
                int parentiD = mCursor.getInt(mCursor.getColumnIndex(MediaStore.Images.Media.BUCKET_ID));  
                // 图片所在当前目录名称  
                String parentname = mCursor.getString(mCursor.getColumnIndex(MediaStore.Images.Media.BUCKET_DISPLAY_NAME));  
                // 图片名称  
                String imagename = mCursor.getString(mCursor.getColumnIndex(MediaStore.Images.Media.DISPLAY_NAME));  
                // 获取图片的路径  
                String path = mCursor.getString(mCursor.getColumnIndex(MediaStore.Images.Media.DATA));  
                ImageInfo imageInfo=new ImageInfo(id, imagename, path, parentiD, parentname);  
                imageInfo.setId(id);  
                imageInfo.setParentID(parentiD);  
                imageInfo.setParentName(parentname);  
                imageInfo.setImageName(imagename);  
                imageInfo.setPath(path);  
                myimages.add(imageInfo);  
            }  
            mCursor.close();