Merge pull request #10 from TopLittelbob/master

update my project
Merge pull request #11 from TopLittelbob/master

Littel architecture change and file operation help class complete
Merge pull request #12 from TopLittelbob/master

sync the last version
Merge pull request #13 from TopLittelbob/master

latest update
finish the animation, modified some layout file, add logo, some other deatils
finish the activity_about.xml and some other deatil modifies
delete unuse image
1.finish the category choosed effect. 2.add the multichooser part. 3.fix some little problems.
1.some ui change
2.some animation improved
3.add pdf convert activity test