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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.provider.Settings.Global;
     24 import android.provider.Settings.System;
     25 import android.support.v7.preference.DropDownPreference;
     26 import android.support.v7.preference.Preference;
     27 import android.support.v7.preference.Preference.OnPreferenceChangeListener;
     28 import android.support.v7.preference.TwoStatePreference;
     29 
     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             CharSequence[] entries = new CharSequence[mValues.length];
     76             CharSequence[] values = new CharSequence[mValues.length];
     77             for (int i = 0; i < mValues.length; i++) {
     78                 entries[i] = getCaption(context.getResources(), mValues[i]);
     79                 values[i] = Integer.toString(mValues[i]);
     80             }
     81             mDropDown.setEntries(entries);
     82             mDropDown.setEntryValues(values);
     83         }
     84         update(context);
     85         if (mTwoState != null) {
     86             p.setOnPreferenceChangeListener(new OnPreferenceChangeListener() {
     87                 @Override
     88                 public boolean onPreferenceChange(Preference preference, Object newValue) {
     89                     setSetting(context, (Boolean) newValue ? 1 : 0);
     90                     return true;
     91                 }
     92             });
     93             return mTwoState;
     94         }
     95         if (mDropDown != null) {
     96             p.setOnPreferenceChangeListener(new OnPreferenceChangeListener() {
     97                 @Override
     98                 public boolean onPreferenceChange(Preference preference, Object newValue) {
     99                     return setSetting(context, Integer.parseInt((String) newValue));
    100                 }
    101             });
    102             return mDropDown;
    103         }
    104         return null;
    105     }
    106 
    107     protected boolean setSetting(Context context, int value) {
    108         return putInt(mType, context.getContentResolver(), mSetting, value);
    109     }
    110 
    111     public Uri getUri() {
    112         return mUri;
    113     }
    114 
    115     public String getKey() {
    116         return mKey;
    117     }
    118 
    119     public void update(Context context) {
    120         final int val = getInt(mType, context.getContentResolver(), mSetting, mDefault);
    121         if (mTwoState != null) {
    122             mTwoState.setChecked(val != 0);
    123         } else if (mDropDown != null) {
    124             mDropDown.setValue(Integer.toString(val));
    125         }
    126     }
    127 
    128     private static Uri getUriFor(int type, String setting) {
    129         switch(type) {
    130             case TYPE_GLOBAL:
    131                 return Global.getUriFor(setting);
    132             case TYPE_SYSTEM:
    133                 return System.getUriFor(setting);
    134         }
    135         throw new IllegalArgumentException();
    136     }
    137 
    138     protected static boolean putInt(int type, ContentResolver cr, String setting, int value) {
    139         switch(type) {
    140             case TYPE_GLOBAL:
    141                 return Global.putInt(cr, setting, value);
    142             case TYPE_SYSTEM:
    143                 return System.putInt(cr, setting, value);
    144         }
    145         throw new IllegalArgumentException();
    146     }
    147 
    148     protected static int getInt(int type, ContentResolver cr, String setting, int def) {
    149         switch(type) {
    150             case TYPE_GLOBAL:
    151                 return Global.getInt(cr, setting, def);
    152             case TYPE_SYSTEM:
    153                 return System.getInt(cr, setting, def);
    154         }
    155         throw new IllegalArgumentException();
    156     }
    157 }