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excel - Android - convert doc, docx pages and xls, xlsx sheets to html using apache POI

I am developing an android application. In which I want to show the doc, docx, xlx, xlsx files in my application.

After searched in google, I came to know that the apachi POI will convert these files into html. So that I have added the "poi-3.8-20120326.jar" into the libs folder and try to build the app. But I did face some dalvik build issue.

So, I searched about this issue and found that the POI jar is supporting for java apps not fully supported for android.

I got some opensource for converting ppt, pptx files. https://github.com/qhm123/POI-Android

In these source code, they have downloaded the apache poi source code and added the source in the app and used it to convert the ppt, pptx files.

So I have used the following code for doc, docx pages to html.

WordToHtmlConverter.main(new String[]{"/sdcard/office/sample.doc", "/sdcard/office/sample.html"});

For this I have added the "org.apache.poi.hwpf" package in my app project. But I got the same dalvik build issue what I mentioned above. So I couldn't build the app.

So how can I do this using apache POI?

Dalvik Error:

[2014-12-01 13:55:27 - POI-operations] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.apache.log4j.chainsaw.ControlPanel$1) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2014-12-01 13:55:27 - POI-operations] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.apache.log4j.chainsaw.ControlPanel$2) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2014-12-01 13:55:27 - POI-operations] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.apache.log4j.chainsaw.ControlPanel$3) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2014-12-01 13:55:27 - POI-operations] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.apache.log4j.chainsaw.ControlPanel$4) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2014-12-01 13:55:27 - POI-operations] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.apache.log4j.chainsaw.ControlPanel$5) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2014-12-01 13:55:27 - POI-operations] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.apache.log4j.chainsaw.ControlPanel$6) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2014-12-01 13:55:27 - POI-operations] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.apache.log4j.chainsaw.ControlPanel$7) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2014-12-01 13:55:28 - POI-operations] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.apache.log4j.chainsaw.Main$1) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2014-12-01 13:55:28 - POI-operations] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.apache.log4j.chainsaw.MyTableModel$1) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2014-12-01 13:55:29 - POI-operations] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.apache.log4j.lf5.util.LogFileParser$1) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2014-12-01 13:55:29 - POI-operations] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.apache.log4j.lf5.viewer.LF5SwingUtils$1) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2014-12-01 13:55:29 - POI-operations] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.apache.log4j.lf5.viewer.LogBrokerMonitor$1) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2014-12-01 13:55:29 - POI-operations] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.apache.log4j.lf5.viewer.LogBrokerMonitor$2) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2014-12-01 13:55:29 - POI-operations] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.apache.log4j.lf5.viewer.LogBrokerMonitor$4) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2014-12-01 13:55:29 - POI-operations] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.apache.log4j.lf5.viewer.LogFactor5ErrorDialog$1) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2014-12-01 13:55:29 - POI-operations] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.apache.log4j.lf5.viewer.LogFactor5InputDialog$1) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2014-12-01 13:55:29 - POI-operations] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.apache.log4j.lf5.viewer.LogFactor5InputDialog$2) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2014-12-01 13:55:29 - POI-operations] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.apache.log4j.lf5.viewer.LogFactor5InputDialog$3) that doesn't come with 

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