SettingsActivity.java

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package com.introlab.rtabmap;

import java.io.File;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.Map.Entry;

import android.Manifest;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.preference.CheckBoxPreference;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.text.InputType;
import android.view.WindowManager;
import android.view.inputmethod.EditorInfo;
import android.widget.EditText;
import android.widget.Toast;

public class SettingsActivity extends PreferenceActivity implements OnSharedPreferenceChangeListener {
        
        private SettingsActivity getActivity() {return this;}
        
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.layout.activity_settings);
        
        Preference buttonReset = findPreference(getString(R.string.pref_key_reset_button));
        buttonReset.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
                @Override
                public boolean onPreferenceClick(Preference preference) {   
                        getPreferenceScreen().getSharedPreferences().edit().clear().commit();
                
                recreate();
                        
                        return true;
                }
        });
        
        Preference buttonOpen = findPreference(getString(R.string.pref_key_open_button));
        buttonOpen.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
                @Override
                public boolean onPreferenceClick(Preference preference) {   
                        File prefsdir = new File(getApplicationInfo().dataDir,"shared_prefs");
                        if(prefsdir.exists() && prefsdir.isDirectory()){
                                ArrayList<String> filesArray = new ArrayList<String>(Arrays.asList(prefsdir.list()));
                                ArrayList<String> newList = new ArrayList<String>();
                                filesArray.remove("com.introlab.rtabmap_preferences.xml");
                                filesArray.remove("WebViewChromiumPrefs.xml");
                                for (String s : filesArray) {
                                        newList.add(s.substring(0, s.length()-4)); // rip off the ".xml"
                                }
                                final String[] files = newList.toArray(new String[filesArray.size()]);
                                if(files.length > 0)
                                {
                                        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
                                        builder.setTitle("Choose Presets:");
                                        builder.setItems(files, new DialogInterface.OnClickListener() {
                                                public void onClick(DialogInterface dialog, final int which) {
                                                        //sp1 is the shared pref to copy to
                                                        SharedPreferences.Editor ed = getPreferenceScreen().getSharedPreferences().edit(); 
                                                        SharedPreferences sp = getActivity().getSharedPreferences(files[which], MODE_PRIVATE); //The shared preferences to copy from
                                                        //Cycle through all the entries in the sp
                                                        for(Entry<String,?> entry : sp.getAll().entrySet()){ 
                                                         Object v = entry.getValue(); 
                                                         String key = entry.getKey();
                                                         //Now we just figure out what type it is, so we can copy it.
                                                         // Note that i am using Boolean and Integer instead of boolean and int.
                                                         // That's because the Entry class can only hold objects and int and boolean are primatives.
                                                         if(v instanceof Boolean) 
                                                         // Also note that i have to cast the object to a Boolean 
                                                         // and then use .booleanValue to get the boolean
                                                            ed.putBoolean(key, ((Boolean)v).booleanValue());
                                                         else if(v instanceof Float)
                                                            ed.putFloat(key, ((Float)v).floatValue());
                                                         else if(v instanceof Integer)
                                                            ed.putInt(key, ((Integer)v).intValue());
                                                         else if(v instanceof Long)
                                                            ed.putLong(key, ((Long)v).longValue());
                                                         else if(v instanceof String)
                                                            ed.putString(key, ((String)v));         
                                                        }
                                                        ed.commit(); //save it.
                                                        recreate();
                                                        return;
                                                }
                                        });
                                        builder.show();
                                }   
                        }

                        return true;
                }
        });
        
        Preference buttonSave = findPreference(getString(R.string.pref_key_save_button));
        buttonSave.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
                @Override
                public boolean onPreferenceClick(Preference preference) {   
                        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
                        builder.setTitle("Save Presets:");
                        final EditText input = new EditText(getActivity());
                        input.setInputType(InputType.TYPE_CLASS_TEXT); 
                        input.setImeOptions(EditorInfo.IME_FLAG_NO_EXTRACT_UI);
                        builder.setView(input);
                        builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                                @Override
                                public void onClick(DialogInterface dialog, int which)
                                {
                                        final String fileName = input.getText().toString();  
                                        dialog.dismiss();
                                        if(!fileName.isEmpty())
                                        {
                                                File newFile = new File(getApplicationInfo().dataDir + "/shared_prefs/" + fileName + ".xml");
                                                if(newFile.exists())
                                                {
                                                        new AlertDialog.Builder(getActivity())
                                                        .setTitle("Presets Already Exist")
                                                        .setMessage("Do you want to overwrite the existing file?")
                                                        .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                                                                public void onClick(DialogInterface dialog, int which) {
                                                                        saveConfig(fileName);
                                                                }
                                                        })
                                                        .setNegativeButton("No", new DialogInterface.OnClickListener() {
                                                                public void onClick(DialogInterface dialog, int which) {
                                                                        dialog.dismiss();
                                                                }
                                                        })
                                                        .show();
                                                }
                                                else
                                                {
                                                        saveConfig(fileName);
                                                }
                                        }
                                }
                        });
                        AlertDialog alertToShow = builder.create();
                        alertToShow.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE);
                        alertToShow.show();

                        return true;
                }
        });
        
        Preference buttonRemove = findPreference(getString(R.string.pref_key_remove_button));
        buttonRemove.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
                @Override
                public boolean onPreferenceClick(Preference preference) {   
                        File prefsdir = new File(getApplicationInfo().dataDir,"shared_prefs");
                        if(prefsdir.exists() && prefsdir.isDirectory()){
                                ArrayList<String> filesArray = new ArrayList<String>(Arrays.asList(prefsdir.list()));
                                ArrayList<String> newList = new ArrayList<String>();
                                filesArray.remove("com.introlab.rtabmap_preferences.xml");
                                filesArray.remove("WebViewChromiumPrefs.xml");
                                for (String s : filesArray) {
                                        newList.add(s.substring(0, s.length()-4)); // rip off the ".xml"
                                }
                                final String[] files = newList.toArray(new String[filesArray.size()]);
                                if(files.length > 0)
                                {
                                        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
                                        builder.setTitle("Remove Presets:");
                                        builder.setItems(files, new DialogInterface.OnClickListener() {
                                                public void onClick(DialogInterface dialog, final int which) {
                                                        File file = new File(getApplicationInfo().dataDir + "/shared_prefs/" + files[which] + ".xml");
                                                        if(file.exists())
                                                        {
                                                                file.delete();
                                                        }
                                                        return;
                                                }
                                        });
                                        builder.show();
                                }   
                        }

                        return true;
                }
        });
        
        Preference buttonGPS = findPreference(getString(R.string.pref_key_gps_saved));
        buttonGPS.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
                @Override
                public boolean onPreferenceClick(Preference preference) {  
                        if(((CustomSwitchPreference)preference).isChecked())
                        {
                                if (!PermissionHelper.hasPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION)) {
                                        ((CustomSwitchPreference)preference).setChecked(false);
                                        PermissionHelper.requestPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION);
                                        return false;
                                }
                        }
                        return true;
                }
        });
        if(((CustomSwitchPreference)buttonGPS).isChecked())
                {
                if (!PermissionHelper.hasPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)) {
                        ((CustomSwitchPreference)buttonGPS).setChecked(false);
                        PermissionHelper.requestPermission(this, Manifest.permission.ACCESS_FINE_LOCATION);
                }
                }
        
        
        ((Preference)findPreference(getString(R.string.pref_key_camera_driver))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_camera_driver))).getEntry() + ") "+getString(R.string.pref_summary_camera_driver));
        ((Preference)findPreference(getString(R.string.pref_key_density))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_density))).getEntry() + ") "+getString(R.string.pref_summary_density));
        ((Preference)findPreference(getString(R.string.pref_key_depth))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_depth))).getEntry() + ") "+getString(R.string.pref_summary_depth));
        ((Preference)findPreference(getString(R.string.pref_key_min_depth))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_min_depth))).getEntry() + ") "+getString(R.string.pref_summary_min_depth));
        ((Preference)findPreference(getString(R.string.pref_key_point_size))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_point_size))).getEntry() + ") "+getString(R.string.pref_summary_point_size));
        ((Preference)findPreference(getString(R.string.pref_key_angle))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_angle))).getEntry() + ") "+getString(R.string.pref_summary_angle));
        ((Preference)findPreference(getString(R.string.pref_key_triangle))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_triangle))).getEntry() + ") "+getString(R.string.pref_summary_triangle));
        ((Preference)findPreference(getString(R.string.pref_key_background_color))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_background_color))).getEntry() + ") "+getString(R.string.pref_summary_background_color));
        ((Preference)findPreference(getString(R.string.pref_key_rendering_texture_decimation))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_rendering_texture_decimation))).getEntry() + ") "+getString(R.string.pref_summary_rendering_texture_decimation));
          
        ((Preference)findPreference(getString(R.string.pref_key_update_rate))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_update_rate))).getEntry() + ") "+getString(R.string.pref_summary_update_rate));
        ((Preference)findPreference(getString(R.string.pref_key_max_speed))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_max_speed))).getEntry() + ") "+getString(R.string.pref_summary_max_speed));
        ((Preference)findPreference(getString(R.string.pref_key_time_thr))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_time_thr))).getEntry() + ") "+getString(R.string.pref_summary_time_thr));
        ((Preference)findPreference(getString(R.string.pref_key_mem_thr))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_mem_thr))).getEntry() + ") "+getString(R.string.pref_summary_mem_thr));
        ((Preference)findPreference(getString(R.string.pref_key_loop_thr))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_loop_thr))).getEntry() + ") "+getString(R.string.pref_summary_loop_thr));
        ((Preference)findPreference(getString(R.string.pref_key_sim_thr))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_sim_thr))).getEntry() + ") "+getString(R.string.pref_summary_sim_thr));
        ((Preference)findPreference(getString(R.string.pref_key_min_inliers))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_min_inliers))).getEntry() + ") "+getString(R.string.pref_summary_min_inliers));
        ((Preference)findPreference(getString(R.string.pref_key_opt_error))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_opt_error))).getEntry() + ") "+getString(R.string.pref_summary_opt_error));
        ((Preference)findPreference(getString(R.string.pref_key_features_voc))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_features_voc))).getEntry() + ") "+getString(R.string.pref_summary_features_voc));
        ((Preference)findPreference(getString(R.string.pref_key_features))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_features))).getEntry() + ") "+getString(R.string.pref_summary_features));
        ((Preference)findPreference(getString(R.string.pref_key_features_type))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_features_type))).getEntry() + ") "+getString(R.string.pref_summary_features_type));
        ((Preference)findPreference(getString(R.string.pref_key_optimizer))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_optimizer))).getEntry() + ") "+getString(R.string.pref_summary_optimizer));
        ((Preference)findPreference(getString(R.string.pref_key_marker_detection))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_marker_detection))).getEntry() + ") "+getString(R.string.pref_summary_marker_detection));
        ((Preference)findPreference(getString(R.string.pref_key_marker_detection_depth_error))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_marker_detection_depth_error))).getEntry() + ") "+getString(R.string.pref_summary_marker_detection_depth_error));
        
        ((Preference)findPreference(getString(R.string.pref_key_cloud_voxel))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_cloud_voxel))).getEntry() + ") "+getString(R.string.pref_summary_cloud_voxel));
        ((Preference)findPreference(getString(R.string.pref_key_texture_size))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_texture_size))).getEntry() + ") "+getString(R.string.pref_summary_texture_size));
        ((Preference)findPreference(getString(R.string.pref_key_texture_count))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_texture_count))).getEntry() + ") "+getString(R.string.pref_summary_texture_count));
        ((Preference)findPreference(getString(R.string.pref_key_normal_k))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_normal_k))).getEntry() + ") "+getString(R.string.pref_summary_normal_k));
        ((Preference)findPreference(getString(R.string.pref_key_max_texture_distance))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_max_texture_distance))).getEntry() + ") "+getString(R.string.pref_summary_max_texture_distance));
        ((Preference)findPreference(getString(R.string.pref_key_min_texture_cluster_size))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_min_texture_cluster_size))).getEntry() + ") "+getString(R.string.pref_summary_min_texture_cluster_size));

        ((Preference)findPreference(getString(R.string.pref_key_opt_depth))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_opt_depth))).getEntry() + ") "+getString(R.string.pref_summary_opt_depth));
        ((Preference)findPreference(getString(R.string.pref_key_opt_color_radius))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_opt_color_radius))).getEntry() + ") "+getString(R.string.pref_summary_opt_color_radius));
        ((Preference)findPreference(getString(R.string.pref_key_opt_min_cluster_size))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_opt_min_cluster_size))).getEntry() + ") "+getString(R.string.pref_summary_opt_min_cluster_size));

        ((Preference)findPreference(getString(R.string.pref_key_cluster_ratio))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_cluster_ratio))).getEntry() + ") "+getString(R.string.pref_summary_cluster_ratio));
        ((Preference)findPreference(getString(R.string.pref_key_gain_max_radius))).setSummary("("+((ListPreference)findPreference(getString(R.string.pref_key_gain_max_radius))).getEntry() + ") "+getString(R.string.pref_summary_gain_max_radius));
    }
    
    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
        Preference pref = findPreference(key);

        if (pref instanceof ListPreference) {
                if(key.compareTo(getString(R.string.pref_key_camera_driver))==0) pref.setSummary("("+ ((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_camera_driver));
                if(key.compareTo(getString(R.string.pref_key_density))==0) pref.setSummary("("+ ((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_density));
                if(key.compareTo(getString(R.string.pref_key_depth))==0) 
                {
                        pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_depth));
                        float maxDepth = Float.parseFloat(((ListPreference)pref).getValue());
                        float minDepth = Float.parseFloat(((ListPreference)findPreference(getString(R.string.pref_key_min_depth))).getValue());
                        if(maxDepth > 0.0f && maxDepth <= minDepth)
                        {
                                ((ListPreference)findPreference(getString(R.string.pref_key_min_depth))).setValueIndex(0);
                        }
                }
                if(key.compareTo(getString(R.string.pref_key_min_depth))==0) 
                {
                        pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_min_depth));
                        float maxDepth = Float.parseFloat(((ListPreference)findPreference(getString(R.string.pref_key_depth))).getValue());
                        float minDepth = Float.parseFloat(((ListPreference)pref).getValue());
                        if(minDepth >= maxDepth)
                        {
                                ((ListPreference)findPreference(getString(R.string.pref_key_depth))).setValueIndex(0);
                        }
                }
                if(key.compareTo(getString(R.string.pref_key_point_size))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_point_size));
                if(key.compareTo(getString(R.string.pref_key_angle))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_angle));
                if(key.compareTo(getString(R.string.pref_key_triangle))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_triangle));
                if(key.compareTo(getString(R.string.pref_key_background_color))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_background_color));
                if(key.compareTo(getString(R.string.pref_key_rendering_texture_decimation))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_rendering_texture_decimation));
                
                if(key.compareTo(getString(R.string.pref_key_update_rate))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_update_rate));
                if(key.compareTo(getString(R.string.pref_key_max_speed))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_max_speed));
                if(key.compareTo(getString(R.string.pref_key_time_thr))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_time_thr));
                if(key.compareTo(getString(R.string.pref_key_mem_thr))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_mem_thr));
                if(key.compareTo(getString(R.string.pref_key_loop_thr))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_loop_thr));
                if(key.compareTo(getString(R.string.pref_key_sim_thr))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_sim_thr));
                if(key.compareTo(getString(R.string.pref_key_min_inliers))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_min_inliers));
                if(key.compareTo(getString(R.string.pref_key_opt_error))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_opt_error));
                if(key.compareTo(getString(R.string.pref_key_features_voc))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_features_voc));
                if(key.compareTo(getString(R.string.pref_key_features))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_features));
                if(key.compareTo(getString(R.string.pref_key_features_type))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_features_type));
                if(key.compareTo(getString(R.string.pref_key_optimizer))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_optimizer));
                if(key.compareTo(getString(R.string.pref_key_marker_detection))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_marker_detection));
                if(key.compareTo(getString(R.string.pref_key_marker_detection_depth_error))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_marker_detection_depth_error));
                
                if(key.compareTo(getString(R.string.pref_key_cloud_voxel))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_cloud_voxel));
                if(key.compareTo(getString(R.string.pref_key_texture_size))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_texture_size));
                if(key.compareTo(getString(R.string.pref_key_texture_count))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_texture_count));
                if(key.compareTo(getString(R.string.pref_key_normal_k))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_normal_k));
                if(key.compareTo(getString(R.string.pref_key_max_texture_distance))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_max_texture_distance));
                if(key.compareTo(getString(R.string.pref_key_min_texture_cluster_size))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_min_texture_cluster_size));

                if(key.compareTo(getString(R.string.pref_key_opt_depth))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_opt_depth));
                if(key.compareTo(getString(R.string.pref_key_opt_color_radius))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_opt_color_radius));
                if(key.compareTo(getString(R.string.pref_key_opt_min_cluster_size))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_opt_min_cluster_size));
                
                if(key.compareTo(getString(R.string.pref_key_cluster_ratio))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_cluster_ratio));
                if(key.compareTo(getString(R.string.pref_key_gain_max_radius))==0) pref.setSummary("("+((ListPreference)pref).getEntry() + ") "+getString(R.string.pref_summary_gain_max_radius));
        
        }
    }
    
    @Override
    protected void onResume() {
        super.onResume();
        // Set up a listener whenever a key changes
        getPreferenceScreen().getSharedPreferences()
                .registerOnSharedPreferenceChangeListener(this);
    }

    @Override
    protected void onPause() {
        super.onPause();
        // Unregister the listener whenever a key changes
        getPreferenceScreen().getSharedPreferences()
                .unregisterOnSharedPreferenceChangeListener(this);
    }
    
    private void saveConfig(String fileName)
    {
        //sp1 is the shared pref to copy to
                SharedPreferences.Editor ed = getActivity().getSharedPreferences(fileName, MODE_PRIVATE).edit(); 
                SharedPreferences sp = getPreferenceScreen().getSharedPreferences(); //The shared preferences to copy from
                ed.clear(); // This clears the one we are copying to, but you don't necessarily need to do that.
                //Cycle through all the entries in the sp
                for(Entry<String,?> entry : sp.getAll().entrySet()){ 
                 Object v = entry.getValue(); 
                 String key = entry.getKey();
                 //Now we just figure out what type it is, so we can copy it.
                 // Note that i am using Boolean and Integer instead of boolean and int.
                 // That's because the Entry class can only hold objects and int and boolean are primatives.
                 if(v instanceof Boolean) 
                 // Also note that i have to cast the object to a Boolean 
                 // and then use .booleanValue to get the boolean
                    ed.putBoolean(key, ((Boolean)v).booleanValue());
                 else if(v instanceof Float)
                    ed.putFloat(key, ((Float)v).floatValue());
                 else if(v instanceof Integer)
                    ed.putInt(key, ((Integer)v).intValue());
                 else if(v instanceof Long)
                    ed.putLong(key, ((Long)v).longValue());
                 else if(v instanceof String)
                    ed.putString(key, ((String)v));         
                }
                ed.commit(); //save it.
    }
    
    @Override
        public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] results) {

                switch (requestCode) {
                        case PermissionHelper.ACCESS_FINE_LOCATION_CODE: {
                                // If request is cancelled, the result arrays are empty.
                                if (results.length > 0 && results[0] == PackageManager.PERMISSION_GRANTED) {
                                        // permission was granted, yay! Do the
                                        // contacts-related task you need to do.
                                        Preference buttonGPS = findPreference(getString(R.string.pref_key_gps_saved));
                                        ((CustomSwitchPreference)buttonGPS).setChecked(true);
                                } else {
                                        // permission denied, boo! Disable the
                                        // functionality that depends on this permission.
                                        Toast.makeText(this, "Location permission is needed to use GPS functionality", Toast.LENGTH_LONG).show();
                                        if (!PermissionHelper.shouldShowRequestPermissionRationale(this, Manifest.permission.ACCESS_FINE_LOCATION)) {
                                                PermissionHelper.launchPermissionSettings(this); // Permission denied with checking "Do not ask again".
                                        }
                                }
                                return;
                        }
                }
        }
}