Fixing Bugs in an android keyboard project

We have a keyboard project built on the Google android kitkat native keyboard The keyboard includes: Changes to the keyboard layout New emojis menu Changes to some values of the keyboard original keys Changes to the suggestions bar Added option to the settings ISSUES TO BE SOLVED • Battery consumption is very high even when the keyboard is not used or set as the active keyboard (primary issues) • when changing between languages (when one of the new 5th row layouts is active) sometimes a big gap appears under the keyboard bottom • In lollipop Android the emojis menu (long press enter) doesn’t show the space key normally , instead it shows a white bar • This issues is only in tablets devices : There is no “go” (enter key) when entering URL or searching SETTINGS ISSUES: • Some features should be premium and premium is extendable through sharing the app on facebook, this process is not working properly and needs fixing • In the settings when the user go to any sub menu there is no a back button on the top left (indicator that this is a sub menu) • Some unnecessary options in the settings need to be hidden ★No more issues in the keyboard core but more issues in the settings will be further mentioned, issues mentioned above to give an idea and to have an estimate cost and duration for the project ★The project is in two parts , native code (documented by Google) , added code (includes a brief about what was added and why but no a detailed documentation) ★★★ you MUST have a strong background on working with android native codes before applying for this project