Home | History | Annotate | Download | only in camera 
      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 
     24 import com.android.camera.R;
     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 
     35     private final String mKey;
     36     private String mValue;
     37     private final String mDefaultValue;
     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         mDefaultValue = a.getString(R.styleable.ListPreference_defaultValue);
     52 
     53         setEntries(a.getTextArray(R.styleable.ListPreference_entries));
     54         setEntryValues(a.getTextArray(
     55                 R.styleable.ListPreference_entryValues));
     56         a.recycle();
     57     }
     58 
     59     public String getKey() {
     60         return mKey;
     61     }
     62 
     63     public CharSequence[] getEntries() {
     64         return mEntries;
     65     }
     66 
     67     public CharSequence[] getEntryValues() {
     68         return mEntryValues;
     69     }
     70 
     71     public void setEntries(CharSequence entries[]) {
     72         mEntries = entries == null ? new CharSequence[0] : entries;
     73     }
     74 
     75     public void setEntryValues(CharSequence values[]) {
     76         mEntryValues = values == null ? new CharSequence[0] : values;
     77     }
     78 
     79     public String getValue() {
     80         if (!mLoaded) {
     81             mValue = getSharedPreferences().getString(mKey, mDefaultValue);
     82             mLoaded = true;
     83         }
     84         return mValue;
     85     }
     86 
     87     public void setValue(String value) {
     88         if (findIndexOfValue(value) < 0) throw new IllegalArgumentException();
     89         mValue = value;
     90         persistStringValue(value);
     91     }
     92 
     93     public void setValueIndex(int index) {
     94         setValue(mEntryValues[index].toString());
     95     }
     96 
     97     public int findIndexOfValue(String value) {
     98         for (int i = 0, n = mEntryValues.length; i < n; ++i) {
     99             if (Util.equals(mEntryValues[i], value)) return i;
    100         }
    101         return -1;
    102     }
    103 
    104     public String getEntry() {
    105         return mEntries[findIndexOfValue(getValue())].toString();
    106     }
    107 
    108     protected void persistStringValue(String value) {
    109         SharedPreferences.Editor editor = getSharedPreferences().edit();
    110         editor.putString(mKey, value);
    111         editor.apply();
    112     }
    113 
    114     @Override
    115     public void reloadValue() {
    116         this.mLoaded = false;
    117     }
    118 
    119     public void filterUnsupported(List<String> supported) {
    120         ArrayList<CharSequence> entries = new ArrayList<CharSequence>();
    121         ArrayList<CharSequence> entryValues = new ArrayList<CharSequence>();
    122         for (int i = 0, len = mEntryValues.length; i < len; i++) {
    123             if (supported.indexOf(mEntryValues[i].toString()) >= 0) {
    124                 entries.add(mEntries[i]);
    125                 entryValues.add(mEntryValues[i]);
    126             }
    127         }
    128         int size = entries.size();
    129         mEntries = entries.toArray(new CharSequence[size]);
    130         mEntryValues = entryValues.toArray(new CharSequence[size]);
    131     }
    132 }
    133