大约有 45,000 项符合查询结果（耗时：0.1055秒） [XML]
How to check programmatically if an application is installed or not in Android?
...an isAppInstalled = appInstalledOrNot("com.check.application");
if(isAppInstalled) {
//This intent will help you to launch if the package is already installed
Intent LaunchIntent = getPackageManager()
.getLaunchIntentForPackage("com.check.applicatio...
How do I break out of nested loops in Java?
...
Like other answerers, I'd definitely prefer to put the loops in a different method, at which point you can just return to stop iterating completely. This answer just shows how the requirements in the question can be met.
You can use break with a label for the outer loop. For example:
publi...
How to prevent a dialog from closing when a button is clicked
... on dialog, it will validate the input and then close the dialog. However, if the input is wrong, I want to remain in the same dialog. Every time no matter what the input is, the dialog should be automatically closed when I click on the "no" button. How can I disable this? By the way, I have used Po...
Exception.Message vs Exception.ToString()
... on the inner exception, and the result of calling Environment.StackTrace. If any of these members is a null reference (Nothing in Visual Basic), its value is not included in the returned string.
If there is no error message or if it is an empty string (""), then no error message is returned. The na...
Convert a JSON String to a HashMap
...p<String, Object> retMap = new HashMap<String, Object>();
if(json != JSONObject.NULL) {
retMap = toMap(json);
}
return retMap;
}
public static Map<String, Object> toMap(JSONObject object) throws JSONException {
Map<String, Object> map = new HashMap&l...
How do I remove a substring from the end of a string in Python?
...nds of x.
Instead, you could use endswith and slicing:
url = 'abcdc.com'
if url.endswith('.com'):
url = url[:-4]
Or using regular expressions:
import re
url = 'abcdc.com'
url = re.sub('\.com$', '', url)
share
...
Test if string is a guid without throwing exceptions?
...return will contain the Guid</param>
/// <returns>Returns true if successful, otherwise false</returns>
public static Boolean TryStrToGuid(String s, out Guid value)
{
//ClsidFromString returns the empty guid for null strings
if ((s == null) || (s == ""))
{
...
c++提取复数的实部和虚部 - C/C++ - 清泛网 - 专注C/C++及内核技术
.../ 结尾的i的位置
for (int i = len-1; i >-1; i--)
{
if ('i' == strCplx[i])
iPos = i;
else if ('+' == strCplx[i] || '-' == strCplx[i])
{
signPos = i;
break;
}
}
if (0 == iPos) // 纯虚数i
{
...
PHPCMS判断首页列表页内页分类 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...时，经常会遇到否栏目，比如首页，就可以这样来判断 {if !$catid}首页{/if} ，判断很简单，比如首页没有 catid 的值，而其它页面有，哪么就可以通过这样的标签来判断，是个省事的判断方法。
下面是相同的一些标签判断，原理...
Clearing localStorage in javascript?
... I call localStorage.clear() when my app starts up, but even if I close the browser, clear cache, etc., the data are still there. I know this because I have set an "instance" property on my model to a random number on initialize, and, for a given id, the instance property is always th...