Google Pinyin for Dvorak users
One of the inherent disadvantages of input methods on touchscreen devices is the lack of decoupling between keyboard layout and input, unlike a desktop PC where the two are entirely independent. As of this writing the only Pinyin input method that supports Traditional and Simplified characters and has support for a Dvorak layout is MultiLing, but I find the predictive abilities of the Google method to be far superior, in addition to swipe and easy Chinese/English switching. However, Google's input method supports only the QWERTY layout. So I decompiled it using apktool and hacked up the XML files to turn it into a Dvorak version. You can download the APK and install directly, or visit the GitHub repository to inspect the code or recompile it yourself.