android下支持pdf、ppt等格式的下载

private static void checkCanHandleDownload(Context context, String mimeType, int destination,
            boolean isPublicApi) throws GenerateSaveFileError {
        if (isPublicApi) {
            return;
        }
        Log.d(\"baron\",\"mimeType=\" + mimeType);//add by Hubin 2013/05/07

        if (destination == Downloads.Impl.DESTINATION_EXTERNAL
                || destination == Downloads.Impl.DESTINATION_CACHE_PARTITION_PURGEABLE) {
            if (mimeType == null) {
                throw new GenerateSaveFileError(Downloads.Impl.STATUS_NOT_ACCEPTABLE,
                        \"external download with no mime type not allowed\");
            }


            //to support pdf/doc/docx/xls/xlsx/ppt/pptx format downloading
            if(mimeType.trim().equalsIgnoreCase(\"application/pdf\")
                || mimeType.trim().equalsIgnoreCase(\"application/msword\")
                || mimeType.trim().equalsIgnoreCase(\"application/vnd.openxmlformats-officedocument.wordprocessingml.document\")
                || mimeType.trim().equalsIgnoreCase(\"application/vnd.ms-excel\")
                || mimeType.trim().equalsIgnoreCase(\"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet\")
                || mimeType.trim().equalsIgnoreCase(\"application/vnd.ms-powerpoint\")
                || mimeType.trim().equalsIgnoreCase(\"application/vnd.openxmlformats-officedocument.presentationml.presentation\")) {
                Log.d(\"baron\",\"start to download \" + mimeType +\" file...\");
                return;
            }


            if (!DrmRawContent.DRM_MIMETYPE_MESSAGE_STRING.equalsIgnoreCase(mimeType)) {
                // Check to see if we are allowed to download this file. Only files
                // that can be handled by the platform can be downloaded.
                // special case DRM files, which we should always allow downloading.
                Intent intent = new Intent(Intent.ACTION_VIEW);

                // We can provide data as either content: or file: URIs,
                // so allow both. (I think it would be nice if we just did
                // everything as content: URIs)
                // Actually, right now the download manager\'s UId restrictions
                // prevent use from using content: so it\'s got to be file: or
                // nothing

                PackageManager pm = context.getPackageManager();
                intent.setDataAndType(Uri.fromParts(\"file\", \"\", null), mimeType);
                ResolveInfo ri = pm.resolveActivity(intent, PackageManager.MATCH_DEFAULT_ONLY);
                //Log.i(Constants.TAG, \"*** FILENAME QUERY \" + intent + \": \" + list);

                if (ri == null) {
                    if (Constants.LOGV) {
                        Log.v(Constants.TAG, \"no handler found for type \" + mimeType);
                    }
                    throw new GenerateSaveFileError(Downloads.Impl.STATUS_NOT_ACCEPTABLE,
                            \"no handler found for this download type\");
                }
            }
        }
    }