main.py

from kivy.app import App
from kivy.lang import Builder
from jnius import autoclass
from android.runnable import run_on_ui_thread


KV = '''
FloatLayout:
    TextInput:
        size_hint: .5, None
        height: min(self.minimum_height, 800)
        pos_hint: {'center': (.5, .5)}
'''


class Application(App):
    def build(self):
        self._set_keyboard()
        return Builder.load_string(KV)

    @run_on_ui_thread
    def _set_keyboard(self):
        python_activity = autoclass('org.kivy.android.PythonActivity').mActivity
        window = python_activity.getWindow()
        window.setSoftInputMode(16)  # SOFT_INPUT_ADJUST_RESIZE


if __name__ == '__main__':
    Application().run()