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/*
* Copyright 2010 Google Inc.
*
* 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 org.apg.ui.widget;
import android.content.Context;
import android.preference.ListPreference;
import android.util.AttributeSet;
/**
* A list preference which persists its values as integers instead of strings.
* Code reading the values should use
* {@link android.content.SharedPreferences#getInt}.
* When using XML-declared arrays for entry values, the arrays should be regular
* string arrays containing valid integer values.
*
* @author Rodrigo Damazio
*/
public class IntegerListPreference extends ListPreference {
public IntegerListPreference(Context context) {
super(context);
verifyEntryValues(null);
}
public IntegerListPreference(Context context, AttributeSet attrs) {
super(context, attrs);
verifyEntryValues(null);
}
@Override
public void setEntryValues(CharSequence[] entryValues) {
CharSequence[] oldValues = getEntryValues();
super.setEntryValues(entryValues);
verifyEntryValues(oldValues);
}
@Override
public void setEntryValues(int entryValuesResId) {
CharSequence[] oldValues = getEntryValues();
super.setEntryValues(entryValuesResId);
verifyEntryValues(oldValues);
}
@Override
protected String getPersistedString(String defaultReturnValue) {
// During initial load, there's no known default value
int defaultIntegerValue = Integer.MIN_VALUE;
if (defaultReturnValue != null) {
defaultIntegerValue = Integer.parseInt(defaultReturnValue);
}
// When the list preference asks us to read a string, instead read an
// integer.
int value = getPersistedInt(defaultIntegerValue);
return Integer.toString(value);
}
@Override
protected boolean persistString(String value) {
// When asked to save a string, instead save an integer
return persistInt(Integer.parseInt(value));
}
private void verifyEntryValues(CharSequence[] oldValues) {
CharSequence[] entryValues = getEntryValues();
if (entryValues == null) {
return;
}
for (CharSequence entryValue : entryValues) {
try {
Integer.parseInt(entryValue.toString());
} catch (NumberFormatException nfe) {
super.setEntryValues(oldValues);
throw nfe;
}
}
}
}
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