Android Tutorials - Herong's Tutorial Examples

∟AboutAndroid - Application to Retrieve System Information

∟java.lang.System Class - Accessing System Information

This section describes the java.lang.System class on access system-related information and resources including standard input and output.

When writing applications for a new system, I usually want to find out information about that system first. This can be done easily by using the java.lang.System class, which provides access to system-related information and resources including standard input and output.

The java.lang.System class offers the following static methods:

• static Console console() - Returns the Console associated with this VM, or null.
• static long currentTimeMillis() - Returns the current system time in milliseconds since January 1, 1970 00:00:00 UTC.
• static Properties getProperties() - Returns the system properties.
• static Map<String, String> getenv() - Returns an unmodifiable map of all available environment variables.
• static void load(String pathName) - Loads and links the dynamic library that is identified through the specified path.

The java.lang.System class offers the following static fields:

• public static final PrintStream err - Default error output stream.
• public static final InputStream in - Default input stream.
• public static final PrintStream out - Default output stream.

See next tutorials on how to use java.lang.System class to find out Android system information.

Table of Contents

 About This Book

 Installing JDK 1.8 on Windows System

 Installation of Android SDK R24 and Emulator

 Installing Apache Ant 1.9 on Windows System

 Developing First Android Application - HelloAndroid

 Android Application Package (APK) Files

 Android Debug Bridge (adb) Tool

 Android File Systems

►AboutAndroid - Application to Retrieve System Information

►java.lang.System Class - Accessing System Information

 Creating Android Project for Simple Application

 Build, Install and Run Android Application

 System.getProperties() - Retrieving System Properties

 android.widget.ScrollView Class - Scrolling Text View

 System.getenv() Method - System Environment Variables

 android.os.Environment Class - Environment Folders

 android.content.Context - Application Context Information

 android.app.Activity Class and Activity Lifecycle

 View Objects and Layout Resource Files

 Using "adb logcat" Command for Debugging

 Build Process and Package File Content

 Building Your Own Web Browser

 Android Command Line Shell

 Samsung Galaxy Tab 3 Mini Tablet

 USB Debugging Applications on Samsung Tablet

 Android Tablet - LG-V905R

 USB Debugging Applications on LG-V905R Tablet

 Android Phone - LG-P925g

 USB Debugging Applications on LG-P925g Phone

 Archived Tutorials

 References

 Full Version in PDF/EPUB

java.lang.System Class - Accessing System Information - Updated in 2023, by Herong Yang