PreferencesDemoActivity.java

package com.google.mcommerce.sample.android.chapter07.preferences;

// This file is MainActivity.java
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.res.Resources;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.TextView;

import com.google.mcommerce.sample.android.R;

public class PreferencesDemoActivity extends Activity {
	private Resources resources;
	private TextView tv = null;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		resources = this.getResources();

		tv = (TextView) findViewById(R.id.text1);

		setOptionText();
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		MenuInflater inflater = getMenuInflater();
		inflater.inflate(R.menu.mainmenu, menu);
		return true;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		if (item.getItemId() == R.id.menu_prefs) {
			Intent intent = new Intent().setClass(this,
					MainPreferenceActivity.class);
			this.startActivityForResult(intent, 0);
		}
		return true;
	}

	@Override
	public void onActivityResult(int reqCode, int resCode, Intent data) {
		super.onActivityResult(reqCode, resCode, data);
		setOptionText();
	}

	private void setOptionText() {
		String valuesText;
		SharedPreferences prefs = PreferenceManager
				.getDefaultSharedPreferences(this);
		// This is the other way to get to the shared preferences:
		// SharedPreferences prefs = getSharedPreferences(
		// "com.androidbook.preferences.sample_preferences", 0);

		String option = prefs.getString(
				resources.getString(R.string.selected_flight_sort_option),
				resources.getString(R.string.flight_sort_option_default_value));

		String[] optionText = resources
				.getStringArray(R.array.flight_sort_options);

		// Compile a selection of preferences to display
		valuesText = "option value is " + option + " ("
				+ optionText[Integer.parseInt(option)] + ")";

		valuesText += "\nShow Arrival Time: "
				+ prefs.getBoolean("show_arrival_column_pref", false);

		valuesText += "\nAlert email address: "
				+ prefs.getString("alert_email_address", "");

		tv.setText(valuesText);
	}
}