android: fix javadoc

modules/java/jar/CMakeLists.txt

@@ -25,6 +25,8 @@ if(OPENCV_JAVA_TARGET_VERSION)
   set(OPENCV_ANT_JAVAC_EXTRA_ATTRS "${OPENCV_ANT_JAVAC_EXTRA_ATTRS} target=\"${OPENCV_JAVA_TARGET_VERSION}\"")
 endif()
 
+set(OPENCV_JAVADOC_DESTINATION "${OpenCV_BINARY_DIR}/doc/doxygen/html/javadoc" CACHE STRING "")
+
 configure_file("${CMAKE_CURRENT_SOURCE_DIR}/build.xml.in" "${OPENCV_JAVA_DIR}/build.xml" @ONLY)
 list(APPEND depends "${OPENCV_JAVA_DIR}/build.xml")
 

modules/java/jar/build.xml.in

@@ -30,12 +30,13 @@
 
   <target name="javadoc">
     <copy file="@OpenCV_SOURCE_DIR@/doc/mymath.js"
-      todir="@OpenCV_BINARY_DIR@/doc/doxygen/html/javadoc" />
+      todir="@OPENCV_JAVADOC_DESTINATION@" />
 
+    <!-- synchronize with platforms\android\build_sdk.py -->
     <javadoc
       packagenames="org.opencv.*"
       sourcepath="java"
-      destdir="@OpenCV_BINARY_DIR@/doc/doxygen/html/javadoc"
+      destdir="@OPENCV_JAVADOC_DESTINATION@"
       Windowtitle="OpenCV @OPENCV_VERSION_PLAIN@ Java documentation"
       Doctitle="OpenCV Java documentation (@OPENCV_VERSION@)"
       bottom="Generated on ${timestamp} / OpenCV @OPENCV_VCSVERSION@"
@@ -48,7 +49,8 @@
          <![CDATA[
             <script>
               var url = window.location.href;
-              url = url.substring(0, url.lastIndexOf('/', url.indexOf('.html'))) + '/../../../mymath.js';
+              var pos = url.lastIndexOf('/javadoc/');
+              url = pos >= 0 ? (url.substring(0, pos) + '/javadoc/mymath.js') : (window.location.origin + '/mymath.js');
               var script = document.createElement('script');
               script.src = '@OPENCV_MATHJAX_RELPATH@/MathJax.js?config=TeX-AMS-MML_HTMLorMML,' + url;
               document.getElementsByTagName('head')[0].appendChild(script);

platforms/android/build_sdk.py

 #!/usr/bin/env python
 
-import os, sys, subprocess, argparse, shutil, glob, re
+import os, sys
+import argparse
+import glob
+import re
+import shutil
+import subprocess
+import time
+
 import logging as log
 import xml.etree.ElementTree as ET
 
@@ -285,14 +292,34 @@ class Builder:
             for f in files:
                 if f == "android.jar" or f == "annotations.jar":
                     classpaths.append(os.path.join(dir, f))
+        srcdir = os.path.join(self.resultdest, 'sdk', 'java', 'src')
+        dstdir = self.docdest
+        # synchronize with modules/java/jar/build.xml.in
+        shutil.copy2(os.path.join(SCRIPT_DIR, '../../doc/mymath.js'), dstdir)
         cmd = [
             "javadoc",
-            "-header", "OpenCV %s" % self.opencv_version,
+            '-windowtitle', 'OpenCV %s Java documentation' % self.opencv_version,
+            '-doctitle', 'OpenCV Java documentation (%s)' % self.opencv_version,
             "-nodeprecated",
-            "-footer", '<a href="http://docs.opencv.org">OpenCV %s Documentation</a>' % self.opencv_version,
             "-public",
-            '-sourcepath', os.path.join(self.resultdest, 'sdk', 'java', 'src'),
-            "-d", self.docdest,
+            '-sourcepath', srcdir,
+            '-encoding', 'UTF-8',
+            '-charset', 'UTF-8',
+            '-docencoding', 'UTF-8',
+            '--allow-script-in-comments',
+            '-header',
+'''
+            <script>
+              var url = window.location.href;
+              var pos = url.lastIndexOf('/javadoc/');
+              url = pos >= 0 ? (url.substring(0, pos) + '/javadoc/mymath.js') : (window.location.origin + '/mymath.js');
+              var script = document.createElement('script');
+              script.src = '%s/MathJax.js?config=TeX-AMS-MML_HTMLorMML,' + url;
+              document.getElementsByTagName('head')[0].appendChild(script);
+            </script>
+''' % 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0',
+            '-bottom', 'Generated on %s / OpenCV %s' % (time.strftime("%Y-%m-%d %H:%M:%S"), self.opencv_version),
+            "-d", dstdir,
             "-classpath", ":".join(classpaths),
             '-subpackages', 'org.opencv',
         ]