Google Play download pending. 下載卡住的問題

Sometimes we stuck in Google Play with a message "download pending".

Here's an easy to guide you how to solve it.

At first, going to [Setting] - [Apps], then find out "Google Play Store" and get in.
Tap [Storage], then clear data and clear cache might be success.

Good Luck.

Android Studio JAVA_HOME problem 問題

When compile a Android project in Android Studio encounter JAVA_HOME setting problem, you might modify this as following:
當使用 Android Studio 編譯時若遇到 JAVA_HOME 設定錯誤的問題，你可以試著以下操作：

Error message:
錯誤訊息會是像這樣：
Cannot find System Java Compiler. Ensure that you have installed a JDK (not just a JRE) and configured your JAVA_HOME system.

Step 1. [Other Settings] → [Default Project Structure]
一、  其它設定 → 專案預設結構

Step 2. Uncheck [Use embedded JDK] then redirect to your JDK path.
二、 取消勾選 [Use embedded JDK] 並且重新指定你的 JDK 位置

Ref from

參考以下

http://stackoverflow.com/questions/16913397/running-gradle-project-via-eclipse-errors-system-cannot-find-system-java-compil

Can not open Android Studio? bad UseParallelGC

One day, I want to increase my Android Studio performance, I add some parameters in studio64.exe.vmoptions

-Xms2048m

-Xmx4096m

-XX:MaxPermSize=512m

-XX:ReservedCodeCacheSize=768m

-XX:+UseConcMarkSweepGC

-XX:SoftRefLRUPolicyMSPerMB=50

-XX:+UseParallelGC

Then, I can not open Android Studio again!

So! what magic parameter make it wrong?
I google the message for that but all about JAVA_HOME environment issue.

Finally, I found that is ONE bad parameter on that:

-XX:+UseParallelGC

Remove it and restart Android Studio, it work again!

在 Bash Terminal 中要使用 Proxy 連線

在任何 terminal 中(git-bash, cygwin-bash, bash)，需要透過 proxy 連線時，卻出現：

cURL error 60: SSL certificate problem: unable to get local issuer certificate

之類的問題的話，代表 bash 環境裡的 proxy 未設定，透過下面的方法可在 bash 裡走 proxy 出去：

1. 編輯 bashrc 檔

matt@matt-pc ~ vi ~/.bashrc

2. 在文檔中加入
export htttp_proxy="http://<name>:<password>@<proxy_address>":"port"

例如：

export http_proxy="http://matt:1234@matt-proxy":"80"

export https_proxy="http://matt:1234@matt-proxy":"80"

export ftp_proxy="http://matt:1234@matt-proxy":"80"

export ssh_proxy="http://matt:1234@matt-proxy":"80"

在 windows 下 ssh 遇到 diffie-hellman-group1-sha1 問題時

在 windows上裝 cygwin 或是 git-bash 後要 git clone 時發生下面的問題：

$ git clone ssh://123.45.67.89:29418/Code/MyApp.git
Cloning into 'MyApp'...
Unable to negotiate with 123.45.67.89: no matching key exchange method found.
Their offer: diffie-hellman-group1-sha1
fatal: Could not read from remote repository.
Please make sure you have the correct access rights and the repository exists. my_name@my_host

或是在連線時發生：
$ ssh -p 29418 123.45.67.89
Unable to negotiate with 123.45.67.89: no matching key exchange method found. 
Their offer: diffie-hellman-group1-sha1

首先要檢查是否有設定 ~/.ssh/config 這個檔案


檔案內容可能如下：
HOST 123.45.67.89
PORT 29418
USER my_name

但因為是 windows 上使用模擬的 console (cygwin or git-bash ...etc) ，或是 ssh 的版本有問題，出現上述的 error 時，建議在下方加入這行

HOST 123.45.67.89
PORT 29418
USER my_name
KexAlgorithms +diffie-hellman-group1-sha1


再次執行
$ ssh -p 29418 123.45.67.89
==========================================================
  ****    Welcome to Gerrit Code Review    ****

  Hi matt, you have successfully connected over SSH.

  Unfortunately, interactive shells are disabled.
  To clone a hosted Git repository, use:

  git clone ssh://my_name@123.45.67.89:29418/REPOSITORY_NAME.git

Connection to 123.45.67.89 closed.
==========================================================

這樣就代表你連成功了！


如果是使用 TortoiseGit + ssh 又不想打帳密，還可以參考這篇 PuTTYgen
http://floatfrog.blogspot.tw/2015/06/tortoisegitssh-keygitlab.html

一個不錯的網頁 介紹 Android / ADB / Commands

Android / ADB / Commands ::
http://imsardine.simplbug.com/note/android/adb/commands/commands.html#shell

寫的很不錯

What does notations mean in Android xml resource document? @android:type、@*、？、@+

這篇是我看過寫的最好的一篇
Android xml资源文件中@、@android:type、@*、？、@+含义和区别

http://www.programgo.com/article/3549141171/

================================================================

以下為引用的內文

1、@[<package_name>:][<resource_type>/]<resource_name>和 @+[<package_name>:][<resource_type>/]<resource_name>, @android:id

简单的概括就是：

＠[<resource_type/],resource_name>表示引用本应用中类型为reource_type的叫resource_name的资源。

＠[<package_name>:][<resource_type/],resource_name>表示引用packgage_name这个包中类型为reource_type的叫resource_name的资源。这里的包一般就是framework中的android。

＠+[<resource_type/],resource_name>表示新增加到本应用中类型为reource_type的叫resource_name的资源，通过aapt会自动生成一个整型的ID和它对应。

＠+[<package_name>:][<resource_type/],resource_name>表示新增加到package_name的包中类型为reource_type的叫resource_name的资源，通过aapt会自动生成一个整型的ID和它对应。

如何更新 D-Link 無線分享器 AP 的韌體 How to upgrade D'Link Wireless AP firmware

如何刷 D-Link 無線分享器的韌體？ 不論是刷回原廠或是刷成蕃茄都適用。

1. 將 AP 電源關閉並拔掉電源線。

(Turn off WiFi AP, then unplug the power.)

2. 用筆尖按壓 Reset 鍵不放，插入電源線，等待電源燈持續閃爍。

(Use a sharp pen to press and hold the RESET button, then plug in power wired, until the power indicated light blinking.)

3. 先將電腦的區網 IP (LAN IP) 設為 192.168.0.2 ，然後插上 AP 的 LAN 端。

( Set the Intranet IP as 192.168.0.2, then plug the RJ45 network wired to LAN port.)

 

4. 這時候開啟瀏覽器，連至 AP 的 IP 192.168.0.1，此時就能看到 D-LINK 的畫面，選擇你要上傳的韌體。

(Now open your browser, connect to 192.168.0.1 that is your WiFi AP. You can see D-Link portal, to select the firmware you want to upload.)

5. 上傳後看到成功的畫面後重開機就成功囉！

(After uploaded, reboot the device will success.)

很~簡~單~吧

( So~ Ea~ Sy~)

Modify git alias (修改alias)

How do I alias commands in git?
http://stackoverflow.com/questions/2553786/how-do-i-alias-commands-in-git


我的 Git 偏好設定
https://ihower.tw/blog/archives/5436

lg = log --color --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' --abbrev-commit

[Ubuntu] 修改 bash ，讓 Terminal 不顯示主機名稱

總是覺得 Terminal 的畫面不夠寬嗎？ 除了調整字體大小與視窗大小外，還可以透過修改 Bash 來節省空間。

以上圖為例，假使我不希望顯示長長的主機名稱，做法很簡單，只要修改 ~/.bashrc 來達成：

vi ~/.bashrc

找到變數 PS1 後，將 \h 刪除即可，記得重新開 terminal 或執行 bash 才生效。

其它可用的參數：

a : an ASCII bell character (07)

\d : the date in "Weekday Month Date" format (e.g., "Tue May 26")

\D{format} : the format is passed to strftime(3) and the result is inserted into the prompt string; an empty format results in a locale-specific time representation. The braces are required

\e : an ASCII escape character (033)

\h : the hostname up to the first '.'

\H : the hostname

\j : the number of jobs currently managed by the shell

\l : the basename of the shell’s terminal device name

\n : newline

\r : carriage return

\s : the name of the shell, the basename of $0 (the portion following the final slash)

\t : the current time in 24-hour HH:MM:SS format

\T : the current time in 12-hour HH:MM:SS format

\@ : the current time in 12-hour am/pm format

\A : the current time in 24-hour HH:MM format

\u : the username of the current user

\v : the version of bash (e.g., 2.00)

\V : the release of bash, version + patch level (e.g., 2.00.0)

\w : the current working directory, with $HOME abbreviated with a tilde

\W : the basename of the current working directory, with $HOME abbreviated with a tilde

\! : the history number of this command

\# : the command number of this command

\$ : if the effective UID is 0, a #, otherwise a $

\nnn : the character corresponding to the octal number nnn

\\ : a backslash

\[ : begin a sequence of non-printing characters, which could be used to embed a terminal control sequence into the prompt

\] : end a sequence of non-printing characters

參考來源

[1] How to: Change / Setup bash custom prompt (PS1) 

http://www.cyberciti.biz/tips/howto-linux-unix-bash-shell-setup-prompt.html