hostage/src/de/tudarmstadt/informatik/hostage/ui/SettingsActivity.java

package de.tudarmstadt.informatik.hostage.ui;

import de.tudarmstadt.informatik.hostage.R;
import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.os.Bundle;
import android.preference.EditTextPreference;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.widget.Toast;
/**
 * SettingsActivity creates the settings defined in /xml/preferences.xml.
 * @author Lars Pandikow.
 */
public class SettingsActivity extends PreferenceActivity implements OnSharedPreferenceChangeListener {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.preferences);  
        //Set the value of the preference as the summary for the preference
        Preference pref = findPreference("pref_external_location");
        EditTextPreference etp = (EditTextPreference) pref;
        pref.setSummary(etp.getText());
        
      //Set the value of the preference as the summary for the preference
        pref = findPreference("pref_upload_server");
        etp = (EditTextPreference) pref;
        pref.setSummary(etp.getText());
    }    

    protected void onResume() {
    	// register a listener to catch preference changes
        super.onResume();
        getPreferenceScreen().getSharedPreferences()
                .registerOnSharedPreferenceChangeListener(this);
    }

    protected void onPause() {
        super.onPause();
        getPreferenceScreen().getSharedPreferences()
                .unregisterOnSharedPreferenceChangeListener(this);
    }

    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,
            String key) {
    	// Check which preference has been changed
    	if(key.equals("pref_external_location")){
            Preference pref = findPreference(key);
            EditTextPreference etp = (EditTextPreference) pref;
            String path = etp.getText();
            //Check if the Path is valid
            if(!path.startsWith("/"))
            	path = new String("/").concat(path);
            if(!path.endsWith("/"))
            	path = path.concat(new String("/"));
            if (!path.matches("/(([a-zA-Z_0-9])+/)*")){
            	Toast.makeText(getApplicationContext(), "Path not valid. Must only contain a-zA-Z_0-9", Toast.LENGTH_SHORT).show();
            	path = "/";
            }
            pref.setSummary(path);
        }
    	else if(key.equals("pref_upload_server")){
            Preference pref = findPreference(key);
            EditTextPreference etp = (EditTextPreference) pref;
            pref.setSummary(etp.getText());
        }
    	 
    }
}