Android Open Source - azilink Reflection

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License

The source code is released under:

GNU General Public License

Java Source Code

/* AziLink: USB tethering for Android
 * Copyright (C) 2009 by James Perry/*from  www  . j  a  va2  s. c om*/
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) version 3 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.lfx.azilink;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.NoSuchMethodException;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.Service;
import android.content.Context;

/**
 * Reflection class to access private APIs and APIs that change 
 * between versions 
 * 
 * @author jperry (10/28/2009)
 */
public class Reflection {
  private static Method mSystemProperties_get;
  private static Method mStartForeground;
  private static Method mStopForeground;
  public static final int NOTIFY_ID = 1;
  
  static {
    try {
      Class sysProp = Class.forName("android.os.SystemProperties");
      mSystemProperties_get = sysProp.getMethod("get",
          new Class[] { String.class } );      
    } catch(ClassNotFoundException c) {
    } catch(NoSuchMethodException e) {
    }
    
    try {
      mStartForeground = android.app.Service.class.getMethod("startForeground",
          new Class[] { int.class, Notification.class } );      
    } catch(NoSuchMethodException e) {
    }
    
    try {
      mStopForeground = android.app.Service.class.getMethod("stopForeground",
          new Class[] { boolean.class } );      
    } catch(NoSuchMethodException e) {
    }
  }
  
  /**
   * Android 2.0 ignores setForeground, so we need both codepaths here.
   * 
   * @param service Service that's going in the foreground
   * @param notify Notification to display while running
   */
  public static void startForeground(Service service, Notification notify) {
    if(mStartForeground != null) {
      try {
        mStartForeground.invoke(service, NOTIFY_ID, notify);
      } catch (IllegalArgumentException e) {
      } catch (IllegalAccessException e) {
      } catch (InvocationTargetException e) {
      }
    } else {
      service.setForeground(true);
      NotificationManager nm = (NotificationManager) service.getSystemService(Context.NOTIFICATION_SERVICE);
      nm.notify(NOTIFY_ID, notify);
    }
  }
  
  /**
   * Reverses whatever startForeground did.
   * 
   * @param service
   * @param notify
   */
  public static void stopForeground(Service service) {
    if(mStopForeground != null) {
      try {
        mStopForeground.invoke(service, true);
      } catch (IllegalArgumentException e) {
      } catch (IllegalAccessException e) {
      } catch (InvocationTargetException e) {
      }
    } else {
      service.setForeground(false);
      NotificationManager nm = (NotificationManager) service.getSystemService(Context.NOTIFICATION_SERVICE);
      nm.cancel(NOTIFY_ID);
    }
  }
  
  /**
   * Returns the current DNS server, or 4.2.2.2 if one couldn't be found.
   */
  public static String getDNS() {
    if(mSystemProperties_get == null) {
      return "4.2.2.2";
    }
    try {
      String dns = (String) mSystemProperties_get.invoke(null, "net.dns1");
      if(dns != "") return dns;
      return "4.2.2.2";
    } catch(Exception mye) {
      return "4.2.2.2";
    }
  }
}

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