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为AppInventor2开发拓展(Extension) · App Inventor 2 中文网
...属性→高级系统设置→高级→环境变量
新建JAVA_HOME:如果是默认安装路径那么就在这个路径下：C:\Program Files\Java\jdk1.8.0_171
新建Classpath： .;%JAVA_HOME%\lib;%JAVA_HOME%\lib\tools.jar
在Path后面新增：%JAVA_HOME%\bin;%JAVA_HOME%\...
How to change MenuItem icon in ActionBar programmatically
...thod
menu.getItem(0).setIcon(ContextCompat.getDrawable(this, R.drawable.ic_launcher));
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Ruby on Rails: How can I revert a migration with rake db:migrate?
...to revert.
eg. if you want to revert a migration with file name 3846656238_create_users.rb
rake db:migrate:down VERSION=3846656238
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How do I merge a list of dicts into a single dict?
... this:
from functools import reduce
reduce(lambda a, b: dict(a, **b), list_of_dicts)
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How to create Drawable from resource
... something like this.
Drawable myDrawable;
if(android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP){
myDrawable = context.getResources().getDrawable(id, context.getTheme());
} else {
myDrawable = context.getResources().getDrawable(id);
}
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scp (secure copy) to ec2 instance without password
...ermission Denied" error! How can I solve this?
– AleX_
Jan 18 '19 at 22:27
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Inconsistent Accessibility: Parameter type is less accessible than method
...s trying to do the following: JsonConvert.DeserializeObject<List<Name_Of_My_Model>>(response.Content.ReadAsStringAsync().Result); The "Name_Of_My_Model" class wasn't set to either Public nor Private. Turned out I NEEDED to set the "Name_Of_My_Model" (class) to public to be used in a "pu...
'setInterval' vs 'setTimeout' [duplicate]
... edited May 19 '14 at 8:48
gion_13
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answered Apr 23 '10 at 6:39
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MySQL: Transactions vs Locking Tables
...is transferred. And the bank's account, into which they'll happily deposit all the service fees charged on the transaction. Given (as everyone knows these days) that banks are extraordinarily stupid, let's say their system works like this:
$balance = "GET BALANCE FROM your ACCOUNT";
if ($balance &l...
Best way to pretty print a hash
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require 'pp'
pp my_hash
Use pp if you need a built-in solution and just want reasonable line breaks.
Use awesome_print if you can install a gem. (Depending on your users, you may wish to use the index:false option to turn off displaying arr...