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App Inventor 2 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎...
...
创建一个测试数据表，sql如下：
CREATE TABLE users (
id INTEGER PRIMARY KEY,
name TEXT,
age INTEGER);
数据表信息
这时，可以查看一下表信息：
插入数据
往 users 表中插入一条测试数据...
Android selector & text color
...xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true"
android:color="#000000" /> <!-- pressed -->
<item android:state_focused="true"
android:colo...
MySQL Query GROUP BY day / month / year
...in some cases such as where records span several years. SELECT COUNT(event_id), DATE_FORMAT(event_start, '%Y/%m')
– Ric
Apr 4 '13 at 10:25
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Align labels in form next to input
...ible solution:
Give the labels display: inline-block;
Give them a fixed width
Align text to the right
That is:
label {
display: inline-block;
width: 140px;
text-align: right;
}
<div class="block">
<label>Simple label</label>
<input type="text" /&...
What is the best way to detect a mobile device?
...ead of using jQuery you can use simple JavaScript to detect it:
if( /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent) ) {
// some code..
}
Or you can combine them both to make it more accessible through jQuery...
$.browser.device = (/android|webos|iphone...
Placeholder in UITextView
...property (nonatomic, retain) IBInspectable UIColor *placeholderColor;
-(void)textChanged:(NSNotification*)notification;
@end
UIPlaceHolderTextView.m:
#import "UIPlaceHolderTextView.h"
@interface UIPlaceHolderTextView ()
@property (nonatomic, retain) UILabel *placeHolderLabel;
@end
@implemen...
How to change the Text color of Menu item in Android?
Can I change the background color of a Menu item in Android?
27 Answers
27
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How to create a readonly textbox in ASP.NET MVC3 Razor
...nders a normal text-box like this:
<input class="text-box single-line" id="field-id" name="field-name" />
And the second will render to;
<input readonly="readonly" disabled="disabled" class="text-box single-line readonly" id="field-id" name="field-name" />
You can use this solution...
Using a custom typeface in Android
I want to use a custom font for my android application which I am creating.
I can individually change the typeface of each object from Code, but I have hundreds of them.
...
What happens if you call erase() on a map element while iterating from begin to end?
...;
while(pm_it != port_map.end())
{
if (pm_it->second == delete_this_id)
{
pm_it = port_map.erase(pm_it);
}
else
{
++pm_it;
}
}
C++03
Erasing elements in a map does not invalidate any iterators.
(apart from iterators on the element that was deleted)
Actu...