System.getProperties() - Retrieving System Properties

Android Tutorials - Herong's Tutorial Examples

∟AboutAndroid - Application to Retrieve System Information

∟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:

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.