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Simple android app tutorial how to#
Simple android app tutorial install#
Simple android app tutorial update#

When the button is clicked, the barcode scanner will activate. You can see the full source code in my Github. I have also created a simple layout at /layouts/MainLayout.vue cordova plugin add cordova-plugin-qr-barcode-scannerįor our simple app we will have 2 pages - /pages/index.vue and /pages/scan.vue

Simple android app tutorial install#

Go to the /src-cordova folder and install the plugin. The one I used was "cordova-plugin-qr-barcode-scanner". Go to the Cordova plugin page and search for "scanner". We will utilise a Cordova plugin to allow our phone to scan barcodes. This adds the Android platform.Ĭordova requirements - check that everything is in order. In my case this is Ĭordova platform add android - cd to /src-cordova folder. Note that when it asks for "Cordova app id" this is usually a reverse domain name of your company which is used to uniquely identify your app. Quasar mode add cordova - Generate a Cordova project in /src-cordova folder Npm install -g cordova - Install Cordova CLI The below is a summary of the commands used. I won't cover the details as the Quasar page does a very good job already and is quite easy to follow. Step 3 - Set up Cordova, Android and your Windows environment

Go ahead and follow or select your own preferences. Most of the options given by the CLI are default options. Step 1 - Install Quasar CLI and create a project in the folder "myquasar" npm install -g create myquasar I also assume that you already have some Vue knowledge. Hopefully this tutorial will help someone get started in developing mobile apps. Here I will outline my notes and any difficulties I encountered along the way during my own set up.

Simple android app tutorial how to#

Note that the Quasar website already has quite good documentation on how to get started. In this introduction I'll provide an overview on how to build a simple Android app.

Simple android app tutorial update#

We define a DBManager class to perform all database CRUD(Create, Read, Update and Delete) operations.Quasar is a Vue framework that makes it easy to build hybrid mobile apps using Cordova. Hence we can figure out the best way to convert the database from the old schema to the new one.

onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) : It’s called when the schema version we need does not match the schema version of the database, It passes us a SQLiteDatabase object and the old and new version numbers.

It passes us a SQLiteDatabase object, pointing to a newly-created database, that we can populate with tables and initial data.

onCreate(SQLiteDatabase db) : It’s called when there is no database and the app needs one.

Super(context, DB_NAME, null, DB_VERSION) Constructor : This takes the Context (e.g., an Activity), the name of the database, an optional cursor factory (we’ll discuss this later), and an integer representing the version of the database schema you are using (typically starting from 1 and increment later).For that we’ll need to create a custom subclass of SQLiteOpenHelper implementing at least the following three methods. SQLiteOpenHelper wraps up these logic to create and upgrade a database as per our specifications. We will have option to alter the database schema to match the needs of the rest of the app. When the application is upgraded to a newer schema – Our database will still be on the old schema from the older edition of the app.

So we will have to create the tables, indexes, starter data, and so on.

When the application runs the first time – At this point, we do not yet have a database.

SQLiteOpenHelper is designed to get rid of two very common problems.