1/*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.example.android.apis.preference;
18
19import com.example.android.apis.R;
20
21import android.content.SharedPreferences;
22import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
23import android.os.Bundle;
24import android.os.Handler;
25import android.preference.PreferenceActivity;
26import android.preference.CheckBoxPreference;
27import android.widget.Toast;
28
29/**
30 * Example that shows finding a preference from the hierarchy and a custom preference type.
31 */
32public class AdvancedPreferences extends PreferenceActivity implements OnSharedPreferenceChangeListener {
33    public static final String KEY_MY_PREFERENCE = "my_preference";
34    public static final String KEY_ADVANCED_CHECKBOX_PREFERENCE = "advanced_checkbox_preference";
35
36    private CheckBoxPreference mCheckBoxPreference;
37    private Handler mHandler = new Handler();
38
39    /**
40     * This is a simple example of controlling a preference from code.
41     */
42    private Runnable mForceCheckBoxRunnable = new Runnable() {
43        public void run() {
44            if (mCheckBoxPreference != null) {
45                mCheckBoxPreference.setChecked(!mCheckBoxPreference.isChecked());
46            }
47
48            // Force toggle again in a second
49            mHandler.postDelayed(this, 1000);
50        }
51    };
52
53    @Override
54    protected void onCreate(Bundle savedInstanceState) {
55        super.onCreate(savedInstanceState);
56
57        // Load the XML preferences file
58        addPreferencesFromResource(R.xml.advanced_preferences);
59
60        // Get a reference to the checkbox preference
61        mCheckBoxPreference = (CheckBoxPreference)getPreferenceScreen().findPreference(
62                KEY_ADVANCED_CHECKBOX_PREFERENCE);
63    }
64
65    @Override
66    protected void onResume() {
67        super.onResume();
68
69        // Start the force toggle
70        mForceCheckBoxRunnable.run();
71
72        // Set up a listener whenever a key changes
73        getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
74    }
75
76    @Override
77    protected void onPause() {
78        super.onPause();
79
80        // Unregister the listener whenever a key changes
81        getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
82
83        mHandler.removeCallbacks(mForceCheckBoxRunnable);
84    }
85
86    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
87        // Let's do something when my counter preference value changes
88        if (key.equals(KEY_MY_PREFERENCE)) {
89            Toast.makeText(this, "Thanks! You increased my count to "
90                    + sharedPreferences.getInt(key, 0), Toast.LENGTH_SHORT).show();
91        }
92    }
93
94}
95