hostage/src/de/tudarmstadt/informatik/hostage/ui/fragment/PreferenceHostageFrament.java

package de.tudarmstadt.informatik.hostage.ui.fragment;

import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.Bundle;
import android.preference.EditTextPreference;
import android.preference.MultiSelectListPreference;
import android.preference.Preference;
import android.preference.PreferenceFragment;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import de.tudarmstadt.informatik.hostage.R;
import de.tudarmstadt.informatik.hostage.sync.android.SyncUtils;

/**
 * Manages and creates the application preferences view
 *
 * @author Alexander Brakowski
 * @created 02.03.14 21:03
 */
public class PreferenceHostageFrament extends PreferenceFragment implements SharedPreferences.OnSharedPreferenceChangeListener {
    public static CharSequence[] entries = null;
    public static CharSequence[] entriesValues = null;

	/**
	 * Maps an text preference to an suffix string
	 */
	private HashMap<String, String> mSuffixMap;

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void onCreate(Bundle savedInstanceState){
		super.onCreate(savedInstanceState);

		// these preferences are all text preferences
		String[] textPreferences = new String[]{
				"pref_external_location",
				"pref_upload_server",
                "pref_download_server",
				"pref_max_connections",
				"pref_timeout",
				"pref_sleeptime",
				"pref_location_time",
				"pref_location_retries"
		};

		// map the text preferences to suffixes
		this.mSuffixMap = new HashMap<String, String>();
		this.mSuffixMap.put("pref_timeout", "s");
		this.mSuffixMap.put("pref_sleeptime", "ms");
		this.mSuffixMap.put("pref_location_time", "ms");

		addPreferencesFromResource(R.xml.settings_preferences);

		for(String k: textPreferences){
			updatePreferenceSummary(k);
		}

        if(entries == null || entriesValues == null) {
            refreshCountryList();
        }
	}

    private void refreshCountryList(){
        final SharedPreferences sharedPreferences = this.getPreferenceManager().getSharedPreferences();

        Preference p = getPreferenceManager().findPreference("pref_sync_countries");
        final MultiSelectListPreference mp = (MultiSelectListPreference) p;

        AsyncTask<String, Void, List<String[]>> task = new AsyncTask<String, Void, List<String[]>>(){
            @Override
            protected List<String[]> doInBackground(String... params) {
                return SyncUtils.getCountriesFromServer(sharedPreferences.getString("pref_download_server", "http://192.168.1.118:8888"));
            }

            protected void onPostExecute(List<String[]> lst) {
                if(lst != null) {
                    entries = new CharSequence[lst.size()];
                    entriesValues = new CharSequence[lst.size()];

                    for (int i = 0; i < lst.size(); i++) {
                        entries[i] = lst.get(i)[1];
                        entriesValues[i] = lst.get(i)[0];
                    }

                    mp.setEntries(entries);
                    mp.setEntryValues(entriesValues);
                }
            }
        };

        task.execute();
    }
	/**
	 * Updates the summary text of the given preference
	 *
	 * @param key the preference key
	 */
	private void updatePreferenceSummary(String key){
		Preference p = findPreference(key);
		SharedPreferences sharedPreferences = this.getPreferenceManager().getSharedPreferences();

		if(p != null && p instanceof EditTextPreference){
			String suffix = "";

			if(this.mSuffixMap.containsKey(key)){
				suffix = this.mSuffixMap.get(key);
			}

			p.setSummary(sharedPreferences.getString(key, "") + " " + suffix);
		}
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void onResume() {
		super.onResume();
		getPreferenceManager().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void onPause() {
		getPreferenceManager().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
		super.onPause();
	}

/*	@Override
	public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
		super.onPreferenceTreeClick(preferenceScreen, preference);

		if (preference instanceof PreferenceScreen) {
			if(MainActivity.getInstance().mDisplayedFragment != null && MainActivity.getInstance().mDisplayedFragment instanceof UpNavigatible){
				((UpNavigatible) MainActivity.getInstance().mDisplayedFragment).setUpNavigatible(true);
				((UpNavigatible) MainActivity.getInstance().mDisplayedFragment).setUpFragment(SettingsFragment.class);
				MainActivity.getInstance().setDrawerIndicatorEnabled(false);
				return true;
			}
		}

		return false;
	}*/

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
        if(key.equals("pref_download_server")){
            refreshCountryList();
        }

		updatePreferenceSummary(key);
	}
}