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/*
* Copyright (C) 2009 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.camera;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.util.Log;
import android.util.TypedValue;
import java.util.ArrayList;
import java.util.List;
/**
* A type of <code>CameraPreference</code> whose number of possible values
* is limited.
*/
public class ListPreference extends CameraPreference {
private final String TAG = "ListPreference";
private final String mKey;
private String mValue;
private final CharSequence[] mDefaultValues;
private CharSequence[] mEntries;
private CharSequence[] mEntryValues;
private boolean mLoaded = false;
public ListPreference(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray a = context.obtainStyledAttributes(
attrs, R.styleable.ListPreference, 0, 0);
mKey = Util.checkNotNull(
a.getString(R.styleable.ListPreference_key));
// We allow the defaultValue attribute to be a string or an array of
// strings. The reason we need multiple default values is that some
// of them may be unsupported on a specific platform (for example,
// continuous auto-focus). In that case the first supported value
// in the array will be used.
int attrDefaultValue = R.styleable.ListPreference_defaultValue;
TypedValue tv = a.peekValue(attrDefaultValue);
if (tv != null && tv.type == TypedValue.TYPE_REFERENCE) {
mDefaultValues = a.getTextArray(attrDefaultValue);
} else {
mDefaultValues = new CharSequence[1];
mDefaultValues[0] = a.getString(attrDefaultValue);
}
setEntries(a.getTextArray(R.styleable.ListPreference_entries));
setEntryValues(a.getTextArray(
R.styleable.ListPreference_entryValues));
a.recycle();
}
public String getKey() {
return mKey;
}
public CharSequence[] getEntries() {
return mEntries;
}
public CharSequence[] getEntryValues() {
return mEntryValues;
}
public void setEntries(CharSequence entries[]) {
mEntries = entries == null ? new CharSequence[0] : entries;
}
public void setEntryValues(CharSequence values[]) {
mEntryValues = values == null ? new CharSequence[0] : values;
}
public String getValue() {
if (!mLoaded) {
mValue = getSharedPreferences().getString(mKey,
findSupportedDefaultValue());
mLoaded = true;
}
return mValue;
}
// Find the first value in mDefaultValues which is supported.
private String findSupportedDefaultValue() {
for (int i = 0; i < mDefaultValues.length; i++) {
for (int j = 0; j < mEntryValues.length; j++) {
// Note that mDefaultValues[i] may be null (if unspecified
// in the xml file).
if (mEntryValues[j].equals(mDefaultValues[i])) {
return mDefaultValues[i].toString();
}
}
}
return null;
}
public void setValue(String value) {
if (findIndexOfValue(value) < 0) throw new IllegalArgumentException();
mValue = value;
persistStringValue(value);
}
public void setValueIndex(int index) {
setValue(mEntryValues[index].toString());
}
public int findIndexOfValue(String value) {
for (int i = 0, n = mEntryValues.length; i < n; ++i) {
if (Util.equals(mEntryValues[i], value)) return i;
}
return -1;
}
public String getEntry() {
return mEntries[findIndexOfValue(getValue())].toString();
}
protected void persistStringValue(String value) {
SharedPreferences.Editor editor = getSharedPreferences().edit();
editor.putString(mKey, value);
editor.apply();
}
@Override
public void reloadValue() {
this.mLoaded = false;
}
public void filterUnsupported(List<String> supported) {
ArrayList<CharSequence> entries = new ArrayList<CharSequence>();
ArrayList<CharSequence> entryValues = new ArrayList<CharSequence>();
for (int i = 0, len = mEntryValues.length; i < len; i++) {
if (supported.indexOf(mEntryValues[i].toString()) >= 0) {
entries.add(mEntries[i]);
entryValues.add(mEntryValues[i]);
}
}
int size = entries.size();
mEntries = entries.toArray(new CharSequence[size]);
mEntryValues = entryValues.toArray(new CharSequence[size]);
}
public void print() {
Log.v(TAG, "Preference key=" + getKey() + ". value=" + getValue());
for (int i = 0; i < mEntryValues.length; i++) {
Log.v(TAG, "entryValues[" + i + "]=" + mEntryValues[i]);
}
}
}
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