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      1 /*
      2  * Copyright (C) 2009 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.camera;
     18 
     19 import android.content.Context;
     20 import android.content.SharedPreferences;
     21 import android.content.res.TypedArray;
     22 import android.util.AttributeSet;
     23 import android.util.Log;
     24 import android.util.TypedValue;
     25 
     26 import java.util.ArrayList;
     27 import java.util.List;
     28 
     29 /**
     30  * A type of <code>CameraPreference</code> whose number of possible values
     31  * is limited.
     32  */
     33 public class ListPreference extends CameraPreference {
     34     private final String TAG = "ListPreference";
     35     private final String mKey;
     36     private String mValue;
     37     private final CharSequence[] mDefaultValues;
     38 
     39     private CharSequence[] mEntries;
     40     private CharSequence[] mEntryValues;
     41     private boolean mLoaded = false;
     42 
     43     public ListPreference(Context context, AttributeSet attrs) {
     44         super(context, attrs);
     45 
     46         TypedArray a = context.obtainStyledAttributes(
     47                 attrs, R.styleable.ListPreference, 0, 0);
     48 
     49         mKey = Util.checkNotNull(
     50                 a.getString(R.styleable.ListPreference_key));
     51 
     52         // We allow the defaultValue attribute to be a string or an array of
     53         // strings. The reason we need multiple default values is that some
     54         // of them may be unsupported on a specific platform (for example,
     55         // continuous auto-focus). In that case the first supported value
     56         // in the array will be used.
     57         int attrDefaultValue = R.styleable.ListPreference_defaultValue;
     58         TypedValue tv = a.peekValue(attrDefaultValue);
     59         if (tv != null && tv.type == TypedValue.TYPE_REFERENCE) {
     60             mDefaultValues = a.getTextArray(attrDefaultValue);
     61         } else {
     62             mDefaultValues = new CharSequence[1];
     63             mDefaultValues[0] = a.getString(attrDefaultValue);
     64         }
     65 
     66         setEntries(a.getTextArray(R.styleable.ListPreference_entries));
     67         setEntryValues(a.getTextArray(
     68                 R.styleable.ListPreference_entryValues));
     69         a.recycle();
     70     }
     71 
     72     public String getKey() {
     73         return mKey;
     74     }
     75 
     76     public CharSequence[] getEntries() {
     77         return mEntries;
     78     }
     79 
     80     public CharSequence[] getEntryValues() {
     81         return mEntryValues;
     82     }
     83 
     84     public void setEntries(CharSequence entries[]) {
     85         mEntries = entries == null ? new CharSequence[0] : entries;
     86     }
     87 
     88     public void setEntryValues(CharSequence values[]) {
     89         mEntryValues = values == null ? new CharSequence[0] : values;
     90     }
     91 
     92     public String getValue() {
     93         if (!mLoaded) {
     94             mValue = getSharedPreferences().getString(mKey,
     95                     findSupportedDefaultValue());
     96             mLoaded = true;
     97         }
     98         return mValue;
     99     }
    100 
    101     // Find the first value in mDefaultValues which is supported.
    102     private String findSupportedDefaultValue() {
    103         for (int i = 0; i < mDefaultValues.length; i++) {
    104             for (int j = 0; j < mEntryValues.length; j++) {
    105                 // Note that mDefaultValues[i] may be null (if unspecified
    106                 // in the xml file).
    107                 if (mEntryValues[j].equals(mDefaultValues[i])) {
    108                     return mDefaultValues[i].toString();
    109                 }
    110             }
    111         }
    112         return null;
    113     }
    114 
    115     public void setValue(String value) {
    116         if (findIndexOfValue(value) < 0) throw new IllegalArgumentException();
    117         mValue = value;
    118         persistStringValue(value);
    119     }
    120 
    121     public void setValueIndex(int index) {
    122         setValue(mEntryValues[index].toString());
    123     }
    124 
    125     public int findIndexOfValue(String value) {
    126         for (int i = 0, n = mEntryValues.length; i < n; ++i) {
    127             if (Util.equals(mEntryValues[i], value)) return i;
    128         }
    129         return -1;
    130     }
    131 
    132     public String getEntry() {
    133         return mEntries[findIndexOfValue(getValue())].toString();
    134     }
    135 
    136     protected void persistStringValue(String value) {
    137         SharedPreferences.Editor editor = getSharedPreferences().edit();
    138         editor.putString(mKey, value);
    139         editor.apply();
    140     }
    141 
    142     @Override
    143     public void reloadValue() {
    144         this.mLoaded = false;
    145     }
    146 
    147     public void filterUnsupported(List<String> supported) {
    148         ArrayList<CharSequence> entries = new ArrayList<CharSequence>();
    149         ArrayList<CharSequence> entryValues = new ArrayList<CharSequence>();
    150         for (int i = 0, len = mEntryValues.length; i < len; i++) {
    151             if (supported.indexOf(mEntryValues[i].toString()) >= 0) {
    152                 entries.add(mEntries[i]);
    153                 entryValues.add(mEntryValues[i]);
    154             }
    155         }
    156         int size = entries.size();
    157         mEntries = entries.toArray(new CharSequence[size]);
    158         mEntryValues = entryValues.toArray(new CharSequence[size]);
    159     }
    160 
    161     public void print() {
    162         Log.v(TAG, "Preference key=" + getKey() + ". value=" + getValue());
    163         for (int i = 0; i < mEntryValues.length; i++) {
    164             Log.v(TAG, "entryValues[" + i + "]=" + mEntryValues[i]);
    165         }
    166     }
    167 }
    168