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使用App Inventor 2 控制物联网设备/低功耗蓝牙设备(BLE) · App Inventor 2 中文网
...动应用程序。 与传统的Android应用程序开发通常需要使用Java编程不同，App Inventor封装了Android开发模型，并通过图形块隐藏了实现细节，使得Java编程代码对用户来说是不可见的。
因此，在 App Inventor 中构建应用程序只需要通过将...
How do I check if I'm running on Windows in Python? [duplicate]
...d. The
following names have currently been
registered: 'posix', 'nt', 'java'.
In your case, you want to check for 'nt' as os.name output:
import os
if os.name == 'nt':
...
There is also a note on os.name:
See also sys.platform has a finer granularity. os.uname() gives
system-dep...
How to permanently set $PATH on Linux/Unix? [closed]
...ide directories like /usr/local/something/bin to PATH variable or defining JAVA_HOME. Used by PAM and SystemD.
/etc/environment.d/*.conf List of unique assignments, allows references. Perfect for adding system-wide directories like /usr/local/something/bin to PATH variable or defining JAVA_HOME. Th...
使用App Inventor扩展实现多点触控：Scale Detector · App Inventor 2 中文网
...。 你还可以练习实现扩展本身。
规模检测或扩展作为 Java 代码实现，编译和处理以生成 aix 文件，如 App Inventor 扩展中所述。 Java 代码文件 ScaleDetector.java 可在此处获得：
edu.mit.appinventor.ScaleDetector_src.zip
这段扩展代码只不过是...
How do you save/store objects in SharedPreferences on Android?
...
List<Connection> connections = entity.getConnections();
// convert java object to JSON format,
// and returned as JSON formatted string
String connectionsJSONString = new Gson().toJson(connections);
editor.putString(KEY_CONNECTIONS, connectionsJSONString);
editor.commit();
Get List of user...
Trust Store vs Key Store - creating with keytool
...
The terminology is a bit confusing indeed, but both javax.net.ssl.keyStore and javax.net.ssl.trustStore are used to specify which keystores to use, for two different purposes. Keystores come in various formats and are not even necessarily files (see this question), and keytool...
How to parse the AndroidManifest.xml file inside an .apk package
...
This Java method, that runs on an Android, documents (what I've been able to interpret about) the binary format of the AndroidManifest.xml file in the .apk package. The second code box shows how to call decompressXML and how to ...
Difference between solr and lucene
...t something that is ready to use out-of-the-box (even without knowledge of Java) OR
Your infrastructure requirements outweigh search customization requirements.
NOTE:
I don't mean that Solr is hard to customize. Solr is very flexible and provides a lot of pluggable API points, allowing you to th...
Scheduling recurring task in Android
...utor. So it's not the best choice
ScheduledThreadPoolExecutor.
You can use java.util.Timer or ScheduledThreadPoolExecutor (preferred) to schedule an action to occur at regular intervals on a background thread.
Here is a sample using the latter:
ScheduledExecutorService scheduler =
Executors.newS...
Should a retrieval method return 'null' or throw an exception when it can't produce the return value
I am using java language,I have a method that is supposed to return an object if it is found.
36 Answers
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