(PRAC-8)Designing the mobile app to implement the state management.

 import 'package:flutter/material.dart';

void main() {

  runApp(MyApp());

}


class MyApp extends StatefulWidget {

  @override

  //_MyAppState createState() => _MyAppState();

State<MyApp> createState(){

    return _MyAppState();

  }

}


class _MyAppState extends State<MyApp> {

  //state of the widget

  Color _containerColor = Colors.yellow;

  void changeColor() {

    setState(() {

      if (_containerColor == Colors.yellow) {

        _containerColor = Colors.green;

        return;

      }

      _containerColor = Colors.yellow;

    });

  }


  @override

  Widget build(BuildContext context) {

    return MaterialApp(

      title: 'Hello World',

      theme: ThemeData(primarySwatch: Colors.blue),

      home: Scaffold(

        appBar: AppBar(

          title: Text('Hello'),

        ),

        body: Container(color: _containerColor),        

      //  ),

        floatingActionButton: FloatingActionButton(onPressed: changeColor, child: Icon(Icons.add),tooltip: 'Click me',),

      ),

    );

  }

}

Comments

Post a Comment

Popular posts from this blog

python(BI)

PRACTICAL NO.1 AIM: Perform the data classification using classification algorithm.  1A. Perform the data classification using Naïve Baye’s Algorithm. from sklearn.datasets import load_iris iris = load_iris() X = iris.data y = iris.target from sklearn.model_selection import train_test_split X_train,X_test,y_train,y_test=train_test_split(X,y,test_size=0.4,random_state=1) from sklearn.naive_bayes import GaussianNB gnb=GaussianNB() gnb.fit(X_train,y_train) y_pred=gnb.predict(X_test) from sklearn import metrics print("Gaussian Naive Bayes model accuracy(in%):",metrics.accuracy_score(y_test,y_pred)*100) EXAMPLE-span.csv import numpy as np import pandas as pd from sklearn.feature_extraction.text import CountVectorizer from sklearn.naive_bayes import MultinomialNB df=pd.read_csv('/content/spam1.csv',encoding='latin-1') df=df[['Message','Category']] df.columns=['SMS','Type'] countvec=CountVectorizer(ngram_range=(1,4),stop_words='eng...
Read more

Prac_8(AMP)

PRACTICAL 8  Activity.xml <? xml version ="1.0" encoding ="utf-8" ?> <androidx.constraintlayout.widget.ConstraintLayout xmlns: android ="http://schemas.android.com/apk/res/android"     xmlns: app ="http://schemas.android.com/apk/res-auto"     xmlns: tools ="http://schemas.android.com/tools"     android :layout_width ="match_parent"     android :layout_height ="match_parent"     tools :context =".MainActivity" >    <Button         android :id ="@+id/btnstart"         android :layout_width ="wrap_content"         android :layout_height ="wrap_content"         android :text ="Start"         app :layout_constraintBottom_toBottomOf ="parent"         app :layout_constraintEnd_to...
Read more

LSA10

i) Program that demonstrates the use of if..else with test Create a vi editor to write the script: vi Prog1.sh Code: echo Enter any number read n if test $n -gt 0 then              echo $n is positive else              echo $n is negative fi steps forward chmod +X Prog1.sh bash Prog1.sh ii) Program to check existing file Create a vi editor to write the script: code: echo Enter the file name: read fname if [ -f $fname ] then           echo the File Exists. else             echo the File with name $fname does not exists fi iii) Program for string comparison Create a vi editor to write the script: code: echo Enter two Strings read str1 read str2 if [ $str1 = $str2 ] then             echo The strings are identical else             echo The Strings are not id...
Read more