Mega Code Archive
Example that shows finding a preference from the hierarchy and a custom preference type
<![CDATA[
/*
* 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
<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2008 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.
-->
<!-- This is an advanced example showing the custom preference types and manually handling
preference clicks. -->
<PreferenceScreen
xmlns:android="http://schemas.android.com/apk/res/android">
<!-- My custom preference type. This just replaces the actual widget
portion of the preference, if the whole preference wanted to be
replaced we would use the layout attribute instead of the widgetLayout
attribute. -->
<com.example.android.apis.preference.MyPreference
android:key="my_preference"
android:title="@string/title_my_preference"
android:summary="@string/summary_my_preference"
android:defaultValue="100" />
<CheckBoxPreference
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" />
</PreferenceScreen>
]]>