96 lines
2.8 KiB
Java
96 lines
2.8 KiB
Java
/*
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* Copyright 2010 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations under
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* the License.
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*/
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package org.thialfihar.android.apg.ui.widget;
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import android.content.Context;
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import android.preference.ListPreference;
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import android.util.AttributeSet;
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/**
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* A list preference which persists its values as integers instead of strings.
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* Code reading the values should use
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* {@link android.content.SharedPreferences#getInt}.
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* When using XML-declared arrays for entry values, the arrays should be regular
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* string arrays containing valid integer values.
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*
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* @author Rodrigo Damazio
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*/
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public class IntegerListPreference extends ListPreference {
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public IntegerListPreference(Context context) {
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super(context);
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verifyEntryValues(null);
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}
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public IntegerListPreference(Context context, AttributeSet attrs) {
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super(context, attrs);
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verifyEntryValues(null);
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}
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@Override
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public void setEntryValues(CharSequence[] entryValues) {
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CharSequence[] oldValues = getEntryValues();
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super.setEntryValues(entryValues);
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verifyEntryValues(oldValues);
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}
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@Override
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public void setEntryValues(int entryValuesResId) {
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CharSequence[] oldValues = getEntryValues();
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super.setEntryValues(entryValuesResId);
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verifyEntryValues(oldValues);
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}
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@Override
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protected String getPersistedString(String defaultReturnValue) {
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// During initial load, there's no known default value
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int defaultIntegerValue = Integer.MIN_VALUE;
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if (defaultReturnValue != null) {
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defaultIntegerValue = Integer.parseInt(defaultReturnValue);
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}
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// When the list preference asks us to read a string, instead read an
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// integer.
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int value = getPersistedInt(defaultIntegerValue);
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return Integer.toString(value);
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}
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@Override
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protected boolean persistString(String value) {
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// When asked to save a string, instead save an integer
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return persistInt(Integer.parseInt(value));
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}
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private void verifyEntryValues(CharSequence[] oldValues) {
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CharSequence[] entryValues = getEntryValues();
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if (entryValues == null) {
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return;
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}
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for (CharSequence entryValue : entryValues) {
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try {
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Integer.parseInt(entryValue.toString());
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} catch (NumberFormatException nfe) {
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super.setEntryValues(oldValues);
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throw nfe;
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}
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}
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}
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}
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