A non-null String must be provided to a Text widget in Flutter

A non-null String must be provided to a Text widget in Flutter

you can check null safe .

new Text(cart_prod_qty!=null?cart_prod_qty:'Default Value'),

How to change Package name in Flutter?

FOR ANDROID APP NAME

change the label name in your AndroidManifes.xml

<application android:name="io.flutter.app.FlutterApplication" android:label="TheNameOfYourApp"

FOR PACKAGE NAME

Change the package name in your AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="your.package.name">

Also in your build.gradle file inside app folder

defaultConfig { applicationId "your.package.name" minSdkVersion 16 targetSdkVersion 28 resConfigs "en" versionCode flutterVersionCode.toInteger() versionName flutterVersionName testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" }

finally change the package in your MainActivity.java 

class(if the MainActivity.java is not 

avaiable ,check the MainActivity.kt

package your.package.name; import android.content.ComponentName; import android.content.Intent; import android.net.Uri; import android.util.Log; import androidx.annotation.NonNull; public class MainActivity extends FlutterActivity {}

Change the directory name:

From

android\app\src\main\java\com\example\name

To.

android\app\src\main\java\your\package\name

IOS

in ios the package name is the bundle identifier in Info.plist

<key>CFBundleIdentifier</key> <string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>

which is found in Runner.xcodeproj/project.pbxproj

PRODUCT_BUNDLE_IDENTIFIER = com.example.appname;

Flutter custom listview with cardview and icon android studio

                      

                  Flutter custom listview with cardview and icon android studio

1.Add dependencies fluttertoast: ^4.0.1 in pubspec.yaml

dependencies: flutter: sdk: flutter cupertino_icons: ^0.1.3 fluttertoast: ^4.0.1

 

2.Create lib/main.dart 

import 'package:flutter/material.dart'; import 'package:listviewdemo/listview_activity.dart'; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { // This widget is the root of your application. @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Demo', theme: ThemeData( primarySwatch: Colors.purple, visualDensity: VisualDensity.adaptivePlatformDensity, ), home: ListViewActivity(title: 'EmailPageList'), ); } }

 

3.Create lib/email_data.dart model 

class EmailData { EmailData({this.name, this.email, this.phonenumber}); final String name; final String email; final String phonenumber; } List<EmailData> allEmail = [ EmailData( name: 'Amit Rawat', email: 'amit.rawat@me.com', phonenumber: '+109938388380'), EmailData( name: 'John Ricciardi', email: 'John.ricciardi@me.com', phonenumber: '+109938388380'), EmailData( name: 'David Smith ', email: 'David.Smith@me.com', phonenumber: '+109938388380'), EmailData( name: 'Michael Hassinger', email: 'Michael.hassinger@me.com', phonenumber: '+109938388380'), EmailData( name: 'Chris Cupps', email: 'Chris.cupps@me.com', phonenumber: '+1099383-08380'), EmailData( name: 'Mike Nantz', email: 'Mike.nantz@me.com', phonenumber: '+10993838-8380'), EmailData( name: 'Mark Primus', email: 'Mark.primus@me.com', phonenumber: '+1099383-88380'), EmailData( name: 'Muriel Lewellyn', email: 'muriel.lewellyn@me.com', phonenumber: '+1099-38388380'), EmailData( name: 'Hunter Giraud', email: 'Hunter.giraud@me.com', phonenumber: '+109938388-380'), EmailData( name: 'Corina Whiddon', email: 'corina.whiddon@me.com', phonenumber: '+10993838-8380'), EmailData( name: 'Meaghan Covarrubias', email: 'meaghan.covarrubias@me.com', phonenumber: '+10993838-8380'), EmailData( name: 'Daniel Severson', email: 'Daniel .severson@me.com', phonenumber: '+109938388-380'), EmailData( name: 'Maria Baxter', email: 'Maria .baxter@me.com', phonenumber: '+109938388-380'), EmailData( name: 'Alessandra Kahn', email: 'alessandra.kahn@me.com', phonenumber: '+109938388-380'), EmailData( name: 'James Saari', email: 'James .saari@me.com', phonenumber: '+109938388-380'), EmailData( name: 'Valeria Salvador', email: 'valeria.salvador@me.com', phonenumber: '+109938388-380'), EmailData( name: 'Fredrick Folkerts', email: 'fredrick.folkerts@me.com', phonenumber: '+109938388-380'), EmailData( name: 'Delmy Izzi', email: 'delmy.izzi@me.com', phonenumber: '+09938388-380'), EmailData( name: 'Leann Klock', email: 'leann.klock@me.com', phonenumber: '+09938388-380'), EmailData( name: 'Rhiannon Macfarlane', email: 'rhiannon.macfarlane@me.com', phonenumber: '+09938388-380'), ];

4.Create lib/listview_activity.dart

import 'package:flutter/cupertino.dart'; import 'package:flutter/material.dart'; import 'package:listviewdemo/email_data.dart'; import 'listview_title.dart'; class ListViewActivity extends StatelessWidget { ListViewActivity({Key key, this.title}) : super(key: key); final String title; @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text(this.title), ), body: Container( child: _buildList(), ), ); } Widget _buildList() { return ListView.builder( itemCount: allEmail.length, itemBuilder: (BuildContext context, int index) { EmailData data = allEmail[index]; return Card( elevation: 8.0, child: Container( child: EmailListTile(data), ), ); }); } }

5.Create lib/listview_title.dart

import 'package:flutter/material.dart'; import 'package:fluttertoast/fluttertoast.dart'; import 'package:listviewdemo/email_data.dart'; class EmailListTile extends ListTile { EmailListTile(EmailData data) : super( title: Text(data.name), subtitle: Column( crossAxisAlignment: CrossAxisAlignment.start, children: <Widget>[ new Text(data.email), new Text(data.phonenumber) ], ), leading: CircleAvatar(child: Text(data.name[0])), dense: false, trailing: Icon( Icons.arrow_forward, size: 24.0, color: Colors.deepPurple, ), onTap: () { Fluttertoast.showToast( msg: data.email, toastLength: Toast.LENGTH_SHORT, gravity: ToastGravity.CENTER, timeInSecForIosWeb: 1, backgroundColor: Colors.grey, textColor: Colors.white, fontSize: 14.0); }); }

Create First Flutter Application: Flutter Dart Tutorial

                                    Create First Flutter Application: Flutter Dart Tutorial

ProgrammingCodeTech

1.Add dependencies google_fonts: ^1.1.0 in pubspec.yaml

dependencies: flutter: sdk: flutter cupertino_icons: ^0.1.3 google_fonts: ^1.1.0

 

2.Create main.dart

import 'package:flutter/material.dart'; import 'my_home_page.dart'; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { // This widget is the root of your application. @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Demo', theme: ThemeData( primarySwatch: Colors.blue, visualDensity: VisualDensity.adaptivePlatformDensity, ), home: MyHomePage(title: 'Home Page'), ); } }

 

3.Create my_home_page.dart

import 'package:flutter/material.dart'; import 'package:flutter/widgets.dart'; import 'package:google_fonts/google_fonts.dart'; class MyHomePage extends StatelessWidget { MyHomePage({Key key, this.title}) : super(key: key); final String title; @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text(this.title), ), body: Center( child: Text( 'ProgrammingCodeTech', style: GoogleFonts.lato( textStyle: TextStyle( color: Colors.red[800], fontWeight: FontWeight.bold, fontSize: 30, fontStyle: FontStyle.italic)), ), ), ); } }