PrefActivity.java

package co.mwater.clientapp.ui;


import java.util.ArrayList;

import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.os.Bundle;
import android.preference.EditTextPreference;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.Preference.OnPreferenceClickListener;
import android.preference.PreferenceActivity;
import android.preference.PreferenceCategory;
import co.mwater.clientapp.R;
import co.mwater.clientapp.db.MWaterServer;

public class PrefActivity extends PreferenceActivity implements OnSharedPreferenceChangeListener {
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		this.addPreferencesFromResource(R.xml.prefs);

		for (int i = 0; i < getPreferenceScreen().getPreferenceCount(); i++) {
			initSummary(getPreferenceScreen().getPreference(i));
		}
		
		findPreference("login_name").setSummary(MWaterServer.getUsername(this));
		
		findPreference("logout").setOnPreferenceClickListener(new OnPreferenceClickListener() {
			public boolean onPreferenceClick(Preference preference) {
				MWaterServer.login(PrefActivity.this, null, null, new ArrayList<String>());
				Intent intent = new Intent(PrefActivity.this, SignupActivity.class);
				intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
				startActivity(intent);
				finish();
				return true;
			}
		});
	}

	@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);
	}

	public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
		updatePrefSummary(findPreference(key));
	}

	private void initSummary(Preference p) {
		if (p instanceof PreferenceCategory) {
			PreferenceCategory pCat = (PreferenceCategory) p;
			for (int i = 0; i < pCat.getPreferenceCount(); i++) {
				initSummary(pCat.getPreference(i));
			}
		} else {
			updatePrefSummary(p);
		}

	}

	private void updatePrefSummary(Preference p) {
		if (p instanceof ListPreference) {
			ListPreference listPref = (ListPreference) p;
			p.setSummary(listPref.getEntry());
		}
		if (p instanceof EditTextPreference) {
			EditTextPreference editTextPref = (EditTextPreference) p;
			p.setSummary(editTextPref.getText());
		}
	}
}