ListPreference.java revision e480f77352d670b2892a9b7b7cd503838b71ca9f 
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
17package com.android.camera;
18
19import android.content.Context;
20import android.content.SharedPreferences;
21import android.content.res.TypedArray;
22import android.util.AttributeSet;
23
24import com.android.camera.R;
25
26/**
27 * A type of <code>CameraPreference</code> whose number of possible values
28 * is limited.
29 */
30public class ListPreference extends CameraPreference {
31
32    private final String mKey;
33    private String mValue;
34    private final String mDefaultValue;
35
36    private CharSequence[] mEntries;
37    private CharSequence[] mEntryValues;
38    private boolean mLoaded = false;
39
40    public ListPreference(Context context, AttributeSet attrs) {
41        super(context, attrs);
42
43        TypedArray a = context.obtainStyledAttributes(
44                attrs, R.styleable.ListPreference, 0, 0);
45
46        mKey = Util.checkNotNull(
47                a.getString(R.styleable.ListPreference_key));
48        mDefaultValue = a.getString(R.styleable.ListPreference_defaultValue);
49
50        setEntries(a.getTextArray(R.styleable.ListPreference_entries));
51        setEntryValues(a.getTextArray(
52                R.styleable.ListPreference_entryValues));
53        a.recycle();
54    }
55
56    public String getKey() {
57        return mKey;
58    }
59
60    public CharSequence[] getEntries() {
61        return mEntries;
62    }
63
64    public CharSequence[] getEntryValues() {
65        return mEntryValues;
66    }
67
68    public void setEntries(CharSequence entries[]) {
69        mEntries = entries == null ? new CharSequence[0] : entries;
70    }
71
72    public void setEntryValues(CharSequence values[]) {
73        mEntryValues = values == null ? new CharSequence[0] : values;
74    }
75
76    public String getValue() {
77        if (!mLoaded) {
78            mValue = getSharedPreferences().getString(mKey, mDefaultValue);
79            mLoaded = true;
80        }
81        return mValue;
82    }
83
84    public void setValue(String value) {
85        if (findIndexOfValue(value) < 0) throw new IllegalArgumentException();
86        mValue = value;
87        persistStringValue(value);
88    }
89
90    public void setValueIndex(int index) {
91        setValue(mEntryValues[index].toString());
92    }
93
94    public int findIndexOfValue(String value) {
95        for (int i = 0, n = mEntryValues.length; i < n; ++i) {
96            if (Util.equals(mEntryValues[i], value)) return i;
97        }
98        return -1;
99    }
100
101    public String getEntry() {
102        return mEntries[findIndexOfValue(getValue())].toString();
103    }
104
105    protected void persistStringValue(String value) {
106        SharedPreferences.Editor editor = getSharedPreferences().edit();
107        editor.putString(mKey, value);
108        editor.commit();
109    }
110
111    @Override
112    public void reloadValue() {
113        this.mLoaded = false;
114    }
115}
116