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 17 package com.example.android.apis.preference; 18 19 import com.example.android.apis.R; 20 21 import android.content.SharedPreferences; 22 import android.content.SharedPreferences.OnSharedPreferenceChangeListener; 23 import android.os.Bundle; 24 import android.os.Handler; 25 import android.preference.PreferenceActivity; 26 import android.preference.CheckBoxPreference; 27 import android.widget.Toast; 28 29 /** 30 * Example that shows finding a preference from the hierarchy and a custom preference type. 31 */ 32 public 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
