1 files changed, 94 insertions, 0 deletions
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/widget/IntegerListPreference.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/widget/IntegerListPreference.java
new file mode 100644
index 000000000..6e1e4c678
--- /dev/null
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/widget/IntegerListPreference.java
@@ -0,0 +1,94 @@
+/*
+ * 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.sufficientlysecure.keychain.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;
+            }
+        }
+    }
+}