This plugin is based on dropbox sync API The Sync API can be used on Android devices running API version 4 or higher. You can build your application using the SDK for API version 4 or higher, but building with the latest API version is recommended.
Steps:
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Setup Dropbox Sync Project from here
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Copy libs/ folder to your libs/ directory.
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Copy com.badrit.dropbox folder to your src directory
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Update com.badrit.dropbox/Dropbox.java appKey and appMaster with your app values.
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Add this code to res/xml/config.xml
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Update AndroidMainfest.xml to be like the plugin one, but make sure to update it with your dropbox app key
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Copy JS files to your www folder.
This plugin is inspired from Dropbox Sync plugin for iOS
Refrences: