Minimum html support using Html class (no ol/ul)

Support basic html in ComposeActivity using Html and HtmlTree class.

- Extended HtmlTree to take in any arbitrary html -> object converter
  so we can use it to convert html to spanned as well as plaintext.
- Added custom SpannedConverter to feed into HtmlTree.
- Added async task to load Utils.htmlToSpan in the background.
- Moved ComposeActivity#sendOrSaveInternal to a handler thread in
  case Utils.spanToHtml takes a long time.

Note that we only support a subset of the html tags. To see the full
list of tags we currently support, refer to HtmlUtils#SpannedConverter.

Performance:
About 3x faster than using Html.fromHtml (yay!).
Performance should not be an issue for >99% of the users.

b/7406122

Change-Id: I484d7fc7d2f36c4724d9e4cb90fa1d65eadcb903

2 files changed, 29 insertions, 4 deletions

diff --git a/tests/src/com/android/mail/utils/HtmlUtilsTest.java b/tests/src/com/android/mail/utils/HtmlUtilsTest.java
new file mode 100644
index 000000000..24b39076a
--- /dev/null
+++ b/tests/src/com/android/mail/utils/HtmlUtilsTest.java
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2014 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.mail.utils;
+
+import android.test.AndroidTestCase;
+import android.test.suitebuilder.annotation.SmallTest;
+
+@SmallTest
+public class HtmlUtilsTest extends AndroidTestCase {
+    // TODO (jin) IMPLEMENT ME
+}
diff --git a/tests/src/com/android/mail/utils/NotificationUtilsTest.java b/tests/src/com/android/mail/utils/NotificationUtilsTest.java
index 1f8c01fef..925438f69 100644
--- a/tests/src/com/android/mail/utils/NotificationUtilsTest.java
+++ b/tests/src/com/android/mail/utils/NotificationUtilsTest.java
@@ -38,9 +38,9 @@ public class NotificationUtilsTest extends AndroidTestCase {
 
         // Get the html "tree" for this message body
         final HtmlTree htmlTree = Utils.getHtmlTree(html);
-        htmlTree.setPlainTextConverterFactory(new HtmlTree.PlainTextConverterFactory() {
+        htmlTree.setConverterFactory(new HtmlTree.ConverterFactory() {
             @Override
-            public HtmlTree.PlainTextConverter createInstance() {
+            public HtmlTree.Converter<String> createInstance() {
                 return new MailMessagePlainTextConverter();
             }
         });
@@ -65,9 +65,9 @@ public class NotificationUtilsTest extends AndroidTestCase {
 
         // Get the html "tree" for this message body
         final HtmlTree htmlTree = Utils.getHtmlTree(html);
-        htmlTree.setPlainTextConverterFactory(new HtmlTree.PlainTextConverterFactory() {
+        htmlTree.setConverterFactory(new HtmlTree.ConverterFactory() {
             @Override
-            public HtmlTree.PlainTextConverter createInstance() {
+            public HtmlTree.Converter<String> createInstance() {
                 return new MailMessagePlainTextConverter();
             }
         });