android下支持pdf、ppt等格式的下载_android 链接下载intent-优快云博客

本文探讨了在Android设备上处理特定文件类型的下载流程，包括公共API的限制、外部存储和缓存分区的下载策略、以及通过Intent进行文件查看的条件判断。

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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\");
}
}
}
}