安装fcitx-frontend-qt5

azheng@ubuntu16:~$sudo apt-get install fcitx-frontend-qt5

拷贝plugin文件到Qt对应的目录中

azheng@ubuntu16:~$cp/usr/lib/x86_64-linux-gnu/qt5/plugins/platforminputcontexts/libfcitxplatforminputcontextplugin.so/home/azheng/Qt5.7.0/5.7/gcc_64/plugins/platforminputcontexts/

azheng@ubuntu16:~$cp/usr/lib/x86_64-linux-gnu/qt5/plugins/platforminputcontexts/libfcitxplatforminputcontextplugin.so/home/azheng/Qt5.7.0/Tools/QtCreator/lib/Qt/plugins/platforminputcontexts/

azheng@ubuntu16:~$

重启Qt5， 测试OK。