Python-Kivy-Builtdozer:让按钮调用android键盘 [英] Python - Kivy - Builtdozer : Having a button call the android keyboard

问题描述

框架:我说的是一个用Python 2.7编写并与Builtdozer打包在一起的Android应用

Framework: I am talking about an Android app written in Python 2.7 and packaged with Builtdozer

我的应用程序内部有一个带有按钮的构建器

I have a Builder inside the app with a button

Builder.load_string('''
FloatLayout:
                    orientation: 'horizontal'
                    Button:
                        text: str(root.name)
                        font_size: '20sp'
                        pos_hint: {'x':.0, 'y':.3}
                        size_hint: .4, .8
''')

我想创建一个函数change_name，如果我按上面的按钮，则会打开android键盘以接受用户raw_input

I want to create a function, change_name, that, if I press the above button, opens the android keyboard to accept an user raw_input

用户提供的raw_input必须替换上面按钮的文本.

The raw_input provided by the user has to replace the text of the above button.

我的想法是:

1)创建一个变量name = StringProperty('Me')

2)创建一个函数:

def change_name(self):
    self.name = raw_input()

3)用on_release

Builder.load_string('''
    FloatLayout:
                        orientation: 'horizontal'
                        Button:
                            text: str(root.name)
                            font_size: '20sp'
                            pos_hint: {'x':.0, 'y':.3}
                            size_hint: .4, .8
                            on_release: root.change_name() 
    ''')

这是正确的吗?因为实际上是在Ubuntu上运行该应用程序，所以我试图单击该按钮，但该应用程序不要求输入(它似乎已被阻止).

It is correct? Because actually, running the app on Ubuntu, I am trying to click on the button but the app does not ask for an input (it seems blocked).

因此，我认为它在Android上也无法使用.

As a consequence I believe it will not work also on Android.

能否请您帮助我了解我在哪里错了?

Could you please help me understanding where am I wrong?

推荐答案

raw_input允许从 stdin (终端)获取输入.在Android上，您将没有可用的终端.另外， raw_input正在阻止，这将导致应用程序的主事件循环冻结，并导致应用程序停止响应.

raw_input allows to get input from stdin (terminal). On Android you will not have the terminal available. In addition, raw_input is blocking, this causes the main event loop of your app to be freeze and will cause your app to stop responding.

您不应使用raw_input，而应使用Kivy自己的方法.

You shouldn't use raw_input but Kivy's own methods.

另一方面，您想使按钮可编辑(就像它是TextInput一样).您可以创建自己的自定义Button类，也可以使用

On the other hand, you want to make your button editable (as if it were a TextInput). You can create your own custom Button class or use WindowBase.request_keyboard() to request the keyboard manually. However, you can do a little trick by hiding a TextInput and use it to enter the text:

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.textinput import TextInput

kv_text= ('''
<MyWidget>:
    FloatLayout:
        orientation: 'horizontal'
        Button:
            text: 'Hello'
            font_size: '20sp'
            pos_hint: {'x':.0, 'y':.3}
            size_hint: .4, .8
            on_release: root.change_name(self)

        Button:
            text: 'World'
            font_size: '20sp'
            pos_hint: {'x':0.6, 'y':.3}
            size_hint: .4, 0.8
            on_release: root.change_name(self)
''')


class MyWidget(FloatLayout):

    def __init__(self, **kwargs):
        super(MyWidget, self).__init__(**kwargs)
        self.hide_input = TextInput(size_hint=(None,  None),
                                    size = (0, 0),
                                    multiline = False)
        self.hide_input_bind = None

    def change_name(self,  instance):
        if self.hide_input_bind:
            self.hide_input.unbind_uid('text',  self.hide_input_bind)

        self.hide_input.text = instance.text
        self.hide_input.focus = True
        self.hide_input_bind = self.hide_input.fbind('text',  self._update_text,  instance)

    def _update_text(self, button,  instance,  value):
        button.text = value



class MyKivyApp(App):
    def build(self):
        return MyWidget()

def main():
    Builder.load_string(kv_text)
    app = MyKivyApp()
    app.run()

if __name__ == '__main__':
    main()

可在Android上运行的应用(Kivy Launcher):

App working on Android (Kivy Launcher):

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