Adding Utils class to timezonepicker

Change-Id: Ib9345e3256309e682221830a2dbad0347fc66317

1 files changed, 81 insertions, 0 deletions

diff --git a/src/com/android/timezonepicker/TimeZonePickerUtils.java b/src/com/android/timezonepicker/TimeZonePickerUtils.java
new file mode 100644
index 0000000..0580df3
--- /dev/null
+++ b/src/com/android/timezonepicker/TimeZonePickerUtils.java
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2013 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.timezonepicker;
+
+import android.text.format.DateUtils;
+import android.text.format.Time;
+
+import java.util.Locale;
+import java.util.TimeZone;
+
+public class TimeZonePickerUtils {
+
+    /**
+     * Given a timezone id (e.g. America/Los_Angeles), returns the corresponding timezone
+     * display name (e.g. (GMT-7.00) Pacific Time).
+     *
+     * @param id The timezone id
+     * @param millis The time (daylight savings or not)
+     * @return The display name of the timezone.
+     */
+    public static String getGmtDisplayName(String id, long millis) {
+        TimeZone timezone = TimeZone.getTimeZone(id);
+        if (timezone == null) {
+            return null;
+        }
+        return buildGmtDisplayName(timezone, millis);
+    }
+
+    private static String buildGmtDisplayName(TimeZone tz, long timeMillis) {
+        Time time = new Time(tz.getID());
+        time.set(timeMillis);
+
+        StringBuilder sb = new StringBuilder();
+        sb.append("(GMT");
+
+        final int gmtOffset = tz.getOffset(timeMillis);
+        if (gmtOffset < 0) {
+            sb.append('-');
+        } else {
+            sb.append('+');
+        }
+
+        final int p = Math.abs(gmtOffset);
+        sb.append(p / DateUtils.HOUR_IN_MILLIS); // Hour
+
+        final int min = (p / (int) DateUtils.MINUTE_IN_MILLIS) % 60;
+        if (min != 0) { // Show minutes if non-zero
+            sb.append(':');
+            if (min < 10) {
+                sb.append('0');
+            }
+            sb.append(min);
+        }
+        sb.append(") ");
+
+        // tz.inDaylightTime(new Date(timeMillis))
+        String displayName = tz.getDisplayName(time.isDst != 0, TimeZone.LONG,
+                Locale.getDefault());
+        sb.append(displayName);
+
+        if (tz.useDaylightTime()) {
+            sb.append(" \u2600"); // Sun symbol
+        }
+        return sb.toString();
+    }
+
+}