P1R4T3B0X to mobile connection for file sharing

/**
 * http://code.google.com/p/p1r4t3b0x/
 *
 * This is a file from P1R4T3B0X, a program that lets you share files with
 * everyone.
 * Copyright (C) 2012 by Aylatan
 * 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 3 of the License, or
 * (at your option) any later version.
 * 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.
 * The GNU General Public License can be found at http://www.gnu.org/licenses.
 */

package com.piratebox.wifiap;

import java.lang.reflect.Method;

import android.content.Context;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiManager;

/**
 * This class uses reflection to call hidden methods of {@link WifiManager}.
 * 
 * @author Aylatan
 */
public class WifiApManager
{
  
  /**
   * The lookup key for an int that indicates whether Wi-Fi AP is enabled,
   * disabled, enabling, disabling, or failed. Retrieve it with
   * {@link android.content.Intent#getIntExtra(String,int)}.
   * 
   * @see #WIFI_AP_STATE_DISABLED
   * @see #WIFI_AP_STATE_DISABLING
   * @see #WIFI_AP_STATE_ENABLED
   * @see #WIFI_AP_STATE_ENABLING
   * @see #WIFI_AP_STATE_FAILED
   * @hide
   */
  public static final String EXTRA_WIFI_AP_STATE = "wifi_state";
  
  /**
   * The previous Wi-Fi state.
   * 
   * @see #EXTRA_WIFI_AP_STATE
   */
  public static final String EXTRA_PREVIOUS_WIFI_AP_STATE = "previous_wifi_state";
  
  /**
   * Wi-Fi AP is currently being disabled. The state will change to
   * {@link #WIFI_AP_STATE_DISABLED} if it finishes successfully.
   * 
   * @see #WIFI_AP_STATE_CHANGED_ACTION
   * @see #getWifiApState()
   */
  public static final int WIFI_AP_STATE_DISABLING = 0;
  
  /**
   * Wi-Fi AP is disabled.
   * 
   * @see #WIFI_AP_STATE_CHANGED_ACTION
   * @see #getWifiState()
   */
  public static final int WIFI_AP_STATE_DISABLED = 1;
  
  /**
   * Wi-Fi AP is currently being enabled. The state will change to
   * {@link #WIFI_AP_STATE_ENABLED} if it finishes successfully.
   * 
   * @see #WIFI_AP_STATE_CHANGED_ACTION
   * @see #getWifiApState()
   */
  public static final int WIFI_AP_STATE_ENABLING = 2;
  
  /**
   * Wi-Fi AP is enabled.
   * 
   * @see #WIFI_AP_STATE_CHANGED_ACTION
   * @see #getWifiApState()
   */
  public static final int WIFI_AP_STATE_ENABLED = 3;
  
  /**
   * Wi-Fi AP is in a failed state. This state will occur when an error occurs
   * during
   * enabling or disabling
   * 
   * @see #WIFI_AP_STATE_CHANGED_ACTION
   * @see #getWifiApState()
   */
  public static final int WIFI_AP_STATE_FAILED = 4;
  
  /**
   * The {@link WifiManager} instance.
   */
  private final WifiManager wifiManager;
  
  /**
   * Creates a new {@link WifiApManager}.
   * 
   * @param context
   *          the context of the application
   */
  public WifiApManager( Context context )
  {
    wifiManager = (WifiManager) context.getSystemService( Context.WIFI_SERVICE );
  }
  
  /**
   * Turns on or off the wifi access point with the given configuration.
   * The wifi will be turned off if {@code enabled} is true.
   * 
   * @param config
   *          The configuration to set to the wifi access point
   * @param enabled
   *          the state in which to set the wifi access point
   * @return {@code true} if the operation succeeds, {@code false} otherwise
   * @throws Exception
   *           If the AP method could not be accessed
   */
  public boolean setWifiApEnabled( WifiConfiguration config, boolean enabled )
      throws Exception
  {
    
    if ( enabled )
    {
      wifiManager.setWifiEnabled( false );
    }
    
    Method method = wifiManager.getClass( ).getMethod(
      "setWifiApEnabled",
      WifiConfiguration.class,
      boolean.class );
    return (Boolean) method.invoke( wifiManager, config, enabled );
  }
  
  /**
   * Gets the wifi access point enabled state.
   * 
   * @return One of {@link #WIFI_AP_STATE_DISABLED},
   *         {@link #WIFI_AP_STATE_DISABLING}, {@link #WIFI_AP_STATE_ENABLED},
   *         {@link #WIFI_AP_STATE_ENABLING}, {@link #WIFI_AP_STATE_FAILED}
   * @throws Exception
   *           If the AP method could not be accessed
   * @see #isWifiApEnabled()
   */
  public int getWifiApState( ) throws Exception
  {
    Method method = wifiManager.getClass( ).getMethod( "getWifiApState" );
    return (Integer) method.invoke( wifiManager );
  }
  
  /**
   * Return whether wifi access point is enabled or disabled.
   * 
   * @return {@code true} if wifi access point is enabled
   * @throws Exception
   *           If the AP method could not be accessed
   * @see #getWifiApState()
   */
  public boolean isWifiApEnabled( ) throws Exception
  {
    Method method = wifiManager.getClass( ).getMethod( "isWifiApEnabled" );
    return (Boolean) method.invoke( wifiManager );
  }
  
  /**
   * Updates the current wifi access point configuration without changing its
   * state.
   * 
   * @param config
   *          the new configuration to be applied
   * @throws Exception
   *           If the AP method could not be accessed
   */
  public void setWifiApConfiguration( WifiConfiguration config )
      throws Exception
  {
    setWifiApEnabled(
      config,
      getWifiApState( ) == WifiManager.WIFI_STATE_ENABLED );
  }
}