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      1 /*
      2  * Copyright (C) 2014 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.android.settings.notification;
     18 
     19 import android.content.ContentResolver;
     20 import android.content.Context;
     21 import android.content.res.Resources;
     22 import android.net.Uri;
     23 import android.preference.Preference;
     24 import android.preference.TwoStatePreference;
     25 import android.preference.Preference.OnPreferenceChangeListener;
     26 import android.provider.Settings.Global;
     27 import android.provider.Settings.System;
     28 
     29 import com.android.settings.DropDownPreference;
     30 import com.android.settings.SettingsPreferenceFragment;
     31 
     32 /** Helper to manage a two-state or dropdown preference bound to a global or system setting. */
     33 public class SettingPref {
     34     public static final int TYPE_GLOBAL = 1;
     35     public static final int TYPE_SYSTEM = 2;
     36 
     37     protected final int mType;
     38     private final String mKey;
     39     protected final String mSetting;
     40     protected final int mDefault;
     41     private final int[] mValues;
     42     private final Uri mUri;
     43 
     44     protected TwoStatePreference mTwoState;
     45     protected DropDownPreference mDropDown;
     46 
     47     public SettingPref(int type, String key, String setting, int def, int... values) {
     48         mType = type;
     49         mKey = key;
     50         mSetting = setting;
     51         mDefault = def;
     52         mValues = values;
     53         mUri = getUriFor(mType, mSetting);
     54     }
     55 
     56     public boolean isApplicable(Context context) {
     57         return true;
     58     }
     59 
     60     protected String getCaption(Resources res, int value) {
     61         throw new UnsupportedOperationException();
     62     }
     63 
     64     public Preference init(SettingsPreferenceFragment settings) {
     65         final Context context = settings.getActivity();
     66         Preference p = settings.getPreferenceScreen().findPreference(mKey);
     67         if (p != null && !isApplicable(context)) {
     68             settings.getPreferenceScreen().removePreference(p);
     69             p = null;
     70         }
     71         if (p instanceof TwoStatePreference) {
     72             mTwoState = (TwoStatePreference) p;
     73         } else if (p instanceof DropDownPreference) {
     74             mDropDown = (DropDownPreference) p;
     75             for (int value : mValues) {
     76                 mDropDown.addItem(getCaption(context.getResources(), value), value);
     77             }
     78         }
     79         update(context);
     80         if (mTwoState != null) {
     81             p.setOnPreferenceChangeListener(new OnPreferenceChangeListener() {
     82                 @Override
     83                 public boolean onPreferenceChange(Preference preference, Object newValue) {
     84                     setSetting(context, (Boolean) newValue ? 1 : 0);
     85                     return true;
     86                 }
     87             });
     88             return mTwoState;
     89         }
     90         if (mDropDown != null) {
     91             mDropDown.setCallback(new DropDownPreference.Callback() {
     92                 @Override
     93                 public boolean onItemSelected(int pos, Object value) {
     94                     return setSetting(context, (Integer) value);
     95                 }
     96             });
     97             return mDropDown;
     98         }
     99         return null;
    100     }
    101 
    102     protected boolean setSetting(Context context, int value) {
    103         return putInt(mType, context.getContentResolver(), mSetting, value);
    104     }
    105 
    106     public Uri getUri() {
    107         return mUri;
    108     }
    109 
    110     public String getKey() {
    111         return mKey;
    112     }
    113 
    114     public void update(Context context) {
    115         final int val = getInt(mType, context.getContentResolver(), mSetting, mDefault);
    116         if (mTwoState != null) {
    117             mTwoState.setChecked(val != 0);
    118         } else if (mDropDown != null) {
    119             mDropDown.setSelectedValue(val);
    120         }
    121     }
    122 
    123     private static Uri getUriFor(int type, String setting) {
    124         switch(type) {
    125             case TYPE_GLOBAL:
    126                 return Global.getUriFor(setting);
    127             case TYPE_SYSTEM:
    128                 return System.getUriFor(setting);
    129         }
    130         throw new IllegalArgumentException();
    131     }
    132 
    133     protected static boolean putInt(int type, ContentResolver cr, String setting, int value) {
    134         switch(type) {
    135             case TYPE_GLOBAL:
    136                 return Global.putInt(cr, setting, value);
    137             case TYPE_SYSTEM:
    138                 return System.putInt(cr, setting, value);
    139         }
    140         throw new IllegalArgumentException();
    141     }
    142 
    143     protected static int getInt(int type, ContentResolver cr, String setting, int def) {
    144         switch(type) {
    145             case TYPE_GLOBAL:
    146                 return Global.getInt(cr, setting, def);
    147             case TYPE_SYSTEM:
    148                 return System.getInt(cr, setting, def);
    149         }
    150         throw new IllegalArgumentException();
    151     }
    152 }