System.getProperties() - Retrieving System Properties

This section provides tutorial example on how to use the java.lang.System.getProperties() method to retrieve and display Android system properties.

After practiced the build, install and run Android application process, I want to obtain Android system properties through the java.lang.System class.

1. Enhance my application to print out system properties by editing .\src\com\herongyang\AboutAndroid.java

/* AboutAndroid.java
 * Version 2.0 - Displaying system properties
 * Copyright (c) 2015, HerongYang.com, All Rights Reserved.
 */
package com.herongyang;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class AboutAndroid extends Activity {
   @Override
   public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      String msg = "";
      
      msg += "System properties\n";
      msg += "-------------\n";
      java.util.Properties props = System.getProperties();
      java.util.Enumeration e = props.propertyNames();
      while (e.hasMoreElements()) {
         String k = (String) e.nextElement();
         String v = props.getProperty(k);
         msg += k+": "+v+"\n";
      }

      TextView tv = new TextView(this);
      tv.setText(msg);
      setContentView(tv);
   }
}

2. Uninstall the previous version by running "ant uninstall" command.

3. Build, install and run the application again on the emulator. Some system properties are displayed:

AboutAndroid System Properties
AboutAndroid System Properties

But there is problem with the display, the screen does not have enough space to display all properties, and you can not scroll down screen to see more properties. In the next tutorial, I will try to design a scrollable view.

Last update: 2015.

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

 Android 4.0.3 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

 Outdated Tutorials

 References

 PDF Printing Version