How to intercept keystroke messages for the three main keys on your Android phone.

[ChinaGodzilla]

I have finished packaging the APK. Pressing the back key currently doesn't work on Android phones. Apparently my program is not connected to the Android key event when the return key is pressed. How to do it

thanks for yous time.

[burhansvural]

I have finished packaging the APK. Pressing the back key currently doesn't work on Android phones. Apparently my program is not connected to the Android key event when the return key is pressed. How to do it

thanks for yous time.

@ChinaGodzilla
If you share the codes, I can help you with the solution faster.

[ChinaGodzilla]

Sorry, I forgot to post the code. What I want to achieve is that when the back button is pressed on an Android phone, the program will return to the previous page of the current browsing interface

For example: For example, if we press the back button in page.route == "/store": we will return to the home page ’/‘

@burhansvural

import flet
from flet import *
import requests
from bs4 import BeautifulSoup

Url_list = []



def Get_news():
    global Url_list
    Count = 0
    Web_text = requests.get('https://news.china.com/domestic/?x4fc.html')
    # print(Web_text.text)
    soup = BeautifulSoup(Web_text.content.decode('utf8'), 'html.parser')
    # 查找所有的标签
    news_links = soup.find_all('a')

    # 遍历每个<a>标签，输出链接和文本内容
    for link in news_links:
        Count += 1
        href_value = link.get('href')
        news_text = link.text
        # print(f"Link: {href_value}, Text: {news_text}")
        if Count > 40 and Count < 200:
            Url_list.append(news_text + '|' + href_value)


def main(page: Page):
    global Url_list
    page.title = "疼讯新闻"


    def Button_click(e):
        pass

    # ----------------------------------------提示文本款框子程序
    dlg = AlertDialog(
        title=Text('已经是最新热点',size=15,text_align=TextAlign.CENTER,), on_dismiss=lambda e: print("Dialog dismissed!"),


    )

    def Open_dlg(e):
        page.dialog = dlg
        dlg.open = True
        page.update()

    def Close_dlg(e):
        dlg_modal.open = False
        page.update()

    # -----------------------------------------

    # ----------------------------------------底部导航改变事件子程序
    def Navi_change(e):
        nav_dest = e.control.selected_index

        if nav_dest == 0:
            page.go('/')

        if nav_dest == 1:
            Open_dlg(e)



        if nav_dest == 2:
            page.go('/store')

    # ----------------------------------------注册按钮子程序

    def route_change(e):
        global Dialog_text
        page.views.clear()



        lv = ListView(expand=True, spacing=10)

        Get_news()

        for i in Url_list:
            List_split = str(i).split('|')
            lv.controls.append(
                Text(spans=[TextSpan(List_split[0], url=List_split[1], url_target='_self')], size=17))

        Navi = page.navigation_bar = NavigationBar(
            destinations=[
                NavigationDestination(icon=flet.icons.HOME, label="首页"),
                NavigationDestination(icon=flet.icons.NAVIGATION, label="热点"),
                NavigationDestination(icon=flet.icons.ACCOUNT_BOX,selected_icon=flet.icons.BOOKMARK,label="我的",),
            ],on_change=Navi_change)


        page.views.append(
            View(
                "/",
                [
                    AppBar(title=Text('疼讯新闻',weight=FontWeight.BOLD,), center_title=True, color='white', bgcolor=colors.BLUE),

                    lv,
                    Navi,


                ],
            )
        )


        if page.route == "/store":
            page.views.clear()

            # ----------------------------------------提示文本款框子程序
            dlg = AlertDialog(
                title=Text('服务器连接失败！',size=15,text_align=TextAlign.CENTER,), on_dismiss=lambda e: print("Dialog dismissed!")
            )

            def open_dlg(e):
                page.dialog = dlg
                dlg.open = True
                page.update()

            def close_dlg(e):
                dlg_modal.open = False
                page.update()

            # -----------------------------------------


            Navi = page.navigation_bar = NavigationBar(
                destinations=[
                    NavigationDestination(icon=flet.icons.HOME, label="首页"),
                    NavigationDestination(icon=flet.icons.NAVIGATION, label="热点"),
                    NavigationDestination(icon=flet.icons.ACCOUNT_BOX, selected_icon=flet.icons.BOOKMARK,
                                          label="我的", ),
                ], on_change=Navi_change)

            page.views.append(
                View(
                    "/",
                    [
                        AppBar(title=Text('账号注册',weight=FontWeight.BOLD,), center_title=True, color='white', bgcolor=colors.BLUE),


                        Navi,

                    ],
                )
            )
            page.views[-1].controls.append(flet.TextField(label="账号名", autofocus=True))
            page.views[-1].controls.append(flet.TextField(label="密码",password=True, can_reveal_password=True))
            page.views[-1].controls.append(flet.TextField(label="重复密码",password=True, can_reveal_password=True))
            page.views[-1].controls.append(flet.ElevatedButton("注册", on_click=open_dlg))


            # page.views[-1].controls.TextField(label="Last name"),
            # page.views[-1].controls.ElevatedButton("Say hello!", on_click=btn_click),
            # page.views[-1].controls.Column(ref=greetings),

        page.update()

    def view_pop(e):
        page.views.pop()
        top_view = page.views[-1]
        page.go(top_view.route)


    page.on_route_change = route_change
    page.on_view_pop = view_pop

    page.go(page.route)









flet.app(main)