如何在Flutter中创建三次单击按钮 [英] How to create triple click button in flutter

问题描述

如何在flutter中实现三击按钮？

How can I implement a triple-click button in flutter?

三击时，该按钮会将条目存储在Firebase数据库中。

On triple-click, the button will store an entry in Firebase database.

推荐答案

可能无法实现三次单击按钮。但是，如果您真的想尽快使它工作，那么一种简单的方法可能是维护一个计数器以完成点击次数。一旦计数达到3，您需要将条目添加到Firestore。

Implementing "triple click" button in flutter might not be possible. But, if you really want to make it work ASAP then a simple method could be to maintain a counter for the number of clicks done. Once the count reaches 3, you need to add your entry to Firestore.

我已经从flutter的计数器应用样板中修改了代码。

希望您的pubspec.yaml文件中有cloud_firestore。如果没有，则将其添加，并将services.json也放入android的应用程序文件夹或ios的相应目录中。

I have modified the code from the counter app boilerplate of flutter.
Hope you have cloud_firestore in your pubspec.yaml file. If not then add it and put the services.json as well in the app folder of android or respective directory of ios.

cloud_firestore: ^0.13.4+1

所以，现在您可以看一下我的代码使用。

So, now you can have a look at the code that I am using.

import 'package:flutter/material.dart';
import 'package:cloud_firestore/cloud_firestore.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  _incrementCounter() {
    setState(() {
      _counter++;
    });
    if (_counter == 3) {
      Firestore.instance
          .collection('/sampleData')
          .add({'data': "data"}).catchError((e) {
        print(e);
      });
      setState(() {
        _counter = 0;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.display1,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ),
    );
  }
}

我已经编辑了_incrementCounter函数。我添加了一个条件语句来检查_counter是否为3。然后，我添加了Firestore条目。稍后，最重要的是将_counter设置为0，以便用户下次按下按钮3次时，代码将相应地工作。您可以根据需要自定义它。

I have edited the _incrementCounter function. I added a conditional statement to check the _counter if it is 3 or not. Then, I am adding the Firestore entry. Later on, the most important bit is to set the _counter as 0 so that the next time the user presses the button 3 times, then the code will work accordingly. You can customize it according to your needs.

但是请记住，尚未在颤动中发明三次单击，这只是一种变通解决方案，因此请勿将其用于现实生活开发应用程序，因为这将是一个非常糟糕的做法。

But remember, triple clicks have not been yet invented in flutter and this is just a work-around solution and don't use it for Real-life Development applications as this would be a very bad practice.

这篇关于如何在Flutter中创建三次单击按钮的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！