Frey tw-Frey

All InputType for EditText

Constant	Description
none	There is no content type. The text is not editable.

"^(?<!\\d)(?:20\\d{2}(?:(?:0[13578]|1[02])31|(?:0[1,3-9]|1[0-2])(?:29|30))|20(?:0[48]|[2468][048]|[13579][26])0229|20\\d{2}(?:0?[1-9]|1[0-2])(?:0?[1-9]|1\\d|2[0-8]))(?!\\d)$".toRegex()

出處
https://stackoverflow.com/questions/29307768/using-regex-to-match-date-format-in-yyyymmdd https://stackoverflow.com/questions/51224/regular-expression-to-match-valid-dates

試驗
https://regex101.com/r/BYlcwg/1

★ Note: StateFlow support is a preview feature that requires version 7.0.0-alpha04 or higher of the Android Gradle plugin.

😨

https://developer.android.com/topic/libraries/data-binding/observability#stateflow

Why android:fullBackupOnly default value is false?

Cheok Yan Cheng 問道:

In https://developer.android.com/guide/topics/manifest/application-element,

android:fullBackupOnly

>This attribute indicates whether or not to use Auto Backup on devices where it is available. If set to true, then your app performs Auto Backup when installed on a device running Android 6.0 (API level 23) or higher. On older devices, your app ignores this attribute and performs Key/Value Backups. The default value is "false".

If the action is produced further down the UI tree, like in a RecyclerView item or a custom View, the ViewModel should still be the one handling user events.

For example, suppose that all news items from NewsActivity contain a bookmark button. The ViewModel needs to know the ID of the bookmarked news item. When the user bookmarks a news item, the RecyclerView adapter does not call the exposed addBookmark(newsId) function from the ViewModel, which would require a dependency on the ViewModel. Instead, the ViewModel exposes a state object called NewsItemUiState which contains the implementation for handling the event:

data class NewsItemUiState(
    val title: String,
    val body: String,
    val bookmarked: Boolean = false,
    val publicationDate: String,
    val onBookmark: () -> Unit

log4j RCE Exploitation Detection

You can use these commands and rules to search for exploitation attempts against log4j RCE vulnerability CVE-2021-44228

Grep / Zgrep

This command searches for exploitation attempts in uncompressed files in folder /var/log and all sub folders

sudo egrep -I -i -r '\$(\{|%7B)jndi:(ldap[s]?|rmi|dns|nis|iiop|corba|nds|http):/[^\n]+' /var/log

Windows 版

for /f "tokens=*" %i in ('git ls-files') do @(
  for /f %j in ('git log --oneline "%i" ^| find /c /v ""') do @echo "%j", "%i"
) >> git-ls-files-log-count-commits.txt

https://stackoverflow.com/questions/53954114

Fatal Exception: java.lang.SecurityException: Not allowed to bind to service Intent { act=com.google.android.c2dm.intent.REGISTER pkg=com.google.android.gms }
       at android.app.ContextImpl.bindServiceCommon(ContextImpl.java:1741)
       at android.app.ContextImpl.bindService(ContextImpl.java:1651)
       at android.content.ContextWrapper.bindService(ContextWrapper.java:705)
       at com.google.android.gms.common.stats.ConnectionTracker.zza(ConnectionTracker.java:41)
       at com.google.android.gms.common.stats.ConnectionTracker.zza(ConnectionTracker.java:10)
       at com.google.android.gms.common.stats.ConnectionTracker.bindService(ConnectionTracker.java:43)

https://stackoverflow.com/questions/4414171
這問題歷經十年
解決方案也有變化...

比較優雅的做法是使用:

ProcessLifecycleOwner

https://developer.android.com/reference/android/arch/lifecycle/ProcessLifecycleOwner.html

ProcessLifecycleOwner will dispatch ON_START, ON_RESUME events, as a first activity moves through these events. ON_PAUSE, ON_STOP, events will be dispatched with a delay after a last activity passed through them. This delay is long enough to guarantee that ProcessLifecycleOwner won't send any events if activities are destroyed and recreated due to a configuration change.

	# encoding: utf-8

	def company_serial_no_checker(serial)

	# 共八位，全部為數字型態
	at_least_8_digits = /^\d{8}$/
	return false unless at_least_8_digits.match(serial)

	# 各數字分別乘以 1,2,1,2,1,2,4,1
	# 例：統一編號為 53212539