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实时开发、测试和调试工具 · App Inventor 2 中文网
... 你可以从计算机上的终端启动 adb。 转到包含 AppInventor Extras 软件的目录并运行命令 adb logcat
这将显示整个（大）系统日志。 如果你正在调试，则应该打开日志，再次模拟该错误，然后查看日志末尾出现的内容。
adb 的实际目...
How to nicely format floating numbers to String without unnecessary decimal 0?
...ise print the doubles with the minimum necessary precision:
public static String fmt(double d)
{
if(d == (long) d)
return String.format("%d",(long)d);
else
return String.format("%s",d);
}
Produces:
232
0.18
1237875192
4.58
0
1.2345
And does not rely on string manipulati...
Is there a generic constructor with parameter constraint in C#?
...
Agreed...we should have new(float, double), new(string), etc.
– SliverNinja - MSFT
Feb 1 '12 at 17:47
...
Is there shorthand for returning a default value if None in Python? [duplicate]
... I can say x ?? "" , which will give me x if x is not null, and the empty string if x is null. I've found it useful for working with databases.
...
Animate change of view background color on Android
... have its background color defined in a drawable that DOES NOT defines any extra properties like stroke or corner radiuses.
Your view have its background color defined in a drawable and you want to remove any extra properties like stroke or corner radiuses, keep in mind that the removal of the extra...
What is the difference between Integer and int in Java?
...bleValue);
Byte myByteValue = doubleObject.byteValue ();
String myStringValue = doubleObject.toString();
Primitive data types are store the fastest available memory where the Helper class is complex and store in heap memory.
reference from "David Gassner" Java Essential Training...
Which is the first integer that an IEEE 754 float is incapable of representing exactly?
...f... the number it represents is actually 1.abcdef... × 2^e, providing an extra implicit bit of precision.
Therefore, the first integer that cannot be accurately represented and will be rounded is:
For float, 16,777,217 (224 + 1).
For double, 9,007,199,254,740,993 (253 + 1).
>>> 9007199...
How to get the current time as datetime
...ate?
Compared to Nate’s answer, you’ll get numbers with this one, not strings… pick your choice!
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Strange out of memory issue while loading an image to a Bitmap object
...);
int imageHeight = options.outHeight;
int imageWidth = options.outWidth;
String imageType = options.outMimeType;
To avoid java.lang.OutOfMemory exceptions, check the dimensions of a bitmap before decoding it, unless you absolutely trust the source to provide you with predictably sized image data...
Moment JS - check if a date is today or in the future
...
The constructor that takes a date string is deprecated.
– Vahid Amiri
Aug 11 '16 at 1:33
...