diff options
Diffstat (limited to 'org_apg/src/org/apg/ui/widget/IntegerListPreference.java')
-rw-r--r-- | org_apg/src/org/apg/ui/widget/IntegerListPreference.java | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/org_apg/src/org/apg/ui/widget/IntegerListPreference.java b/org_apg/src/org/apg/ui/widget/IntegerListPreference.java new file mode 100644 index 000000000..fa411a786 --- /dev/null +++ b/org_apg/src/org/apg/ui/widget/IntegerListPreference.java @@ -0,0 +1,95 @@ +/* + * 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; + } + } + } +} |