/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.android.apis.preference;
import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.os.Bundle;
import android.os.Handler;
import android.preference.PreferenceActivity;
import android.preference.CheckBoxPreference;
import android.widget.Toast;
/**
* Example that shows finding a preference from the hierarchy and a custom preference type.
*/
public class AdvancedPreferences extends PreferenceActivity implements OnSharedPreferenceChangeListener {
public static final String KEY_MY_PREFERENCE = "my_preference";
public static final String KEY_ADVANCED_CHECKBOX_PREFERENCE = "advanced_checkbox_preference";
private CheckBoxPreference mCheckBoxPreference;
private Handler mHandler = new Handler();
/**
* This is a simple example of controlling a preference from code.
*/
private Runnable mForceCheckBoxRunnable = new Runnable() {
public void run() {
if (mCheckBoxPreference != null) {
mCheckBoxPreference.setChecked(!mCheckBoxPreference.isChecked());
}
// Force toggle again in a second
mHandler.postDelayed(this, 1000);
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Load the XML preferences file
addPreferencesFromResource(R.xml.advanced_preferences);
// Get a reference to the checkbox preference
mCheckBoxPreference = (CheckBoxPreference)getPreferenceScreen().findPreference(
KEY_ADVANCED_CHECKBOX_PREFERENCE);
}
@Override
protected void onResume() {
super.onResume();
// Start the force toggle
mForceCheckBoxRunnable.run();
// 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);
mHandler.removeCallbacks(mForceCheckBoxRunnable);
}
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
// Let's do something when my counter preference value changes
if (key.equals(KEY_MY_PREFERENCE)) {
Toast.makeText(this, "Thanks! You increased my count to "
+ sharedPreferences.getInt(key, 0), Toast.LENGTH_SHORT).show();
}
}
}
//xml/advanced_preferences.xml
xmlns:android="http://schemas.android.com/apk/res/android">
android:key="my_preference"
android:title="@string/title_my_preference"
android:summary="@string/summary_my_preference"
android:defaultValue="100" />
android:key="advanced_checkbox_preference"
android:title="@string/title_advanced_toggle_preference"
android:summaryOn="@string/summary_on_advanced_toggle_preference"
android:summaryOff="@string/summary_off_advanced_toggle_preference" />