PreferencesActivity.java

package de.fun2code.android.piratebox;

import java.io.File;

import android.app.Activity;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.os.Bundle;
import android.preference.CheckBoxPreference;
import android.preference.Preference;
import android.preference.Preference.OnPreferenceClickListener;
import android.preference.PreferenceActivity;
import android.preference.PreferenceManager;
import android.widget.Toast;
import de.fun2code.android.piratebox.database.DatabaseHandler;
import de.fun2code.android.piratebox.dialog.directory.DirectoryDialog;
import de.fun2code.android.piratebox.dialog.directory.DirectorySelectListener;
import de.fun2code.android.piratebox.handler.ConnectionCountHandler;
import de.fun2code.android.piratebox.util.DialogUtil;
import de.fun2code.android.piratebox.util.NetworkUtil;
import de.fun2code.android.piratebox.util.ShellUtil;

/**
 * Main preference Activity
 * 
 * @author joschi
 *
 */
public class PreferencesActivity extends PreferenceActivity {
	private SharedPreferences preferences;
	private Activity activity;
	
	/**
	 * Shared preference listener that is used to update the SSID on the fly
	 */
	private OnSharedPreferenceChangeListener prefChangeListener = new OnSharedPreferenceChangeListener() {
		
		@Override
		public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,
				String key) {
			// Update SSID by using iwconfig command
			if(key.equals(Constants.PREF_SSID_NAME) && PirateBoxService.isApRunning()) {
				ShellUtil shellUtil = new ShellUtil();
				String[] commands = { "iwconfig " + NetworkUtil.WIFI_INTERFACE + " essid '" +
				sharedPreferences.getString(Constants.PREF_SSID_NAME, activity.getResources().getString(R.string.pref_ssid_name_default)) + 
				"'" };
				shellUtil.execRootShell(commands);
			}
		}
	};
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		activity = this;
		preferences = PreferenceManager.getDefaultSharedPreferences(this);
		addPreferencesFromResource(R.xml.preferences);
		
		updateExternalServerPreference();
		
		CheckBoxPreference extServerCheckBoxPref = (CheckBoxPreference) findPreference(Constants.PREF_USE_EXTERNAL_SERVER);
		extServerCheckBoxPref.setOnPreferenceClickListener(
				new OnPreferenceClickListener() {

					@Override
					public boolean onPreferenceClick(
							Preference preference) {
						updateExternalServerPreference();

						return true;
					}
				});
	}
	
	@Override
	public void onResume() {
		super.onResume();
		preferences.registerOnSharedPreferenceChangeListener(prefChangeListener);
		
		/*
		 * Handle the press of the restore dnsmawq backup preference button
		 */
		findPreference(Constants.PREF_DEV_RESTORE_DNSMASQ).setOnPreferenceClickListener(new OnPreferenceClickListener() {

			@Override
			public boolean onPreferenceClick(Preference preference) {
				NetworkUtil netUtil = new NetworkUtil(activity.getApplicationContext());
				boolean res = netUtil.unwrapDnsmasq();
				
				int resIdMessage = res ? R.string.dialog_msg_dnsmasq_restore_ok : R.string.dialog_msg_dnsmasq_restore_error;
				
				Toast.makeText(activity.getApplicationContext(), resIdMessage, 
						Toast.LENGTH_SHORT).show();
				return true;
			}
			
			
		});
		
		/*
		 * Handle the press of the restore networking preference button
		 */
		findPreference(Constants.PREF_DEV_RESET_NETWORKING).setOnPreferenceClickListener(new OnPreferenceClickListener() {

			@Override
			public boolean onPreferenceClick(Preference preference) {
				NetworkUtil netUtil = new NetworkUtil(activity.getApplicationContext());
				netUtil.flushIpTable(Constants.NAT_TABLE_NAME);
				
				Toast.makeText(activity.getApplicationContext(), R.string.dialog_msg_network_reset, 
						Toast.LENGTH_SHORT).show();
				return true;
			}
				
		});
		
		/*
		 * Handle the press of the clear statistics preference button
		 */
		findPreference(Constants.PREF_CLEAR_STATISTICS).setOnPreferenceClickListener(new OnPreferenceClickListener() {

			@Override
			public boolean onPreferenceClick(Preference preference) {
				OnClickListener posListener = new OnClickListener() {
					
					@Override
					public void onClick(DialogInterface dialog, int which) {
						DatabaseHandler dbHandler = new DatabaseHandler(activity);
						dbHandler.clearTables();
						
						if(PirateBoxService.isRunning()) {
							ConnectionCountHandler.clearConnectionCount();
						}
						
						Toast.makeText(activity.getApplicationContext(), R.string.dialog_msg_clear_statistics, 
								Toast.LENGTH_SHORT).show();
					}
				};
				
				DialogUtil.showDialog(activity, R.string.dialog_title_confirm, R.string.dialog_qst_clear_statistics, 
						android.R.string.yes, android.R.string.no, posListener, null);
				
				return true;
			}
				
		});
		
		/*
		 * Handle the press of the storage directory preference button
		 * Storage directory is now selectable via directory chooser
		 */
		findPreference(Constants.PREF_STORAGE_DIR).setOnPreferenceClickListener(new OnPreferenceClickListener() {

			@Override
			public boolean onPreferenceClick(Preference preference) {
				DirectorySelectListener dirListener = new DirectorySelectListener() {
					
					@Override
					public void onDirectorySelected(String directory) {
						if(directory != null) {
							Editor edit = preferences.edit();
							edit.putString(Constants.PREF_STORAGE_DIR, directory);
							edit.commit();
							
							/*
							 * Check if directory is writable, if not
							 * show warning message.
							 */
							if(!new File(directory).canWrite()) {
								Toast.makeText(activity, R.string.warning_dir_not_writable,
										Toast.LENGTH_LONG).show();
							}
						}
					}
				};
				
				DirectoryDialog dirDialog = new DirectoryDialog(activity, R.style.PirateBoxTheme, true);
				String dir = preferences.getString(Constants.PREF_STORAGE_DIR, activity.getString(R.string.pref_storage_dir_default));
				dir = new File(dir).exists() && new File(dir).isDirectory() ? dir : "/";
				dirDialog.setCurrentDirectory(dir);
				dirDialog.setTitle(R.string.dialog_title_choose_directory);
				dirDialog.setOnDirectorySelectListener(dirListener);
				/*
				 * Don't only show writable directories show them all.
				 * Otherwise /mnt directories will not be displayed.
				 */
				dirDialog.showOnlyWritableDirs(false);
				dirDialog.show();
				
				return true;
			}
			
			
		});
	}
	
	@Override
	public void onPause() {
		super.onPause();
		preferences.unregisterOnSharedPreferenceChangeListener(prefChangeListener);
	}
	
	/**
	 * Enables/disables the external server port preference depending on the
	 * state of the external server preference.
	 */
	private void updateExternalServerPreference() {
		CheckBoxPreference extServerCheckBoxPref = (CheckBoxPreference) findPreference(Constants.PREF_USE_EXTERNAL_SERVER);
		findPreference(Constants.PREF_EXTERNAL_SERVER_PORT).setEnabled(extServerCheckBoxPref.isChecked());
	}
}