Displaying data in android

Displaying Cache data or Offline mode support in android application

Problems without caching
1. Fetching data over a network connection is an expensive operation. Sometimes due to poor network connectivity, it takes a lot of time to display result( which is a bad experience in terms of mobile application).

2. Sometimes requirement may come with offline support or to display previously fetched response when there is no internet connectivity.

Thanks to Caching mechanism. We can solve the above requirements if we cache some data.

In my project, I have used the dagger, so I have written all the code for caching in ApiModule class. If you want to skip then directly go to below link

How to enable cache
1. define cache memory size

2. Create a cache object ( provide application context )

Provide this cache object in OkHttpClient

Now we will create 2 interceptors ( onlineInterceptor and offlineInterceptor). Interceptors are a powerful mechanism that can monitor, rewrite, and retry calls.

OnlineInterceptor which will be used when the device is connected to the network

OfflineInterceptor which will be used when the device is not connected to the network

Now its time to add cache interceptor to OkHttpClient.

Finally, add OkHttpClient to Retrofit

Using this retrofit instance, we can make an API call and the caching mechanism will work.

Few points to remember

Soon I will post more articles on android, core java.
till then happy learning… 🙂

MindOrks

Our community publishes stories worth reading on Android…

Источник

Display Data From Firebase Firestore in Android RecyclerView

Using Firebase on an Android application may seem scary at first but with time when you get the hang of it, you start to look for tools and libraries that will display your data in a few common layouts on Android.

This article will touch on implementing a recycler view on Android after querying data from Firebase Firestore Database.

Firebase Recycler Adapter

This is one type of RecyclerView adapters offered by the FirebaseUI for Firestore.

How does it work? It binds the results of a query to a recyclerview while responding to all the real-time events i.e. items added/removed/moved/changed.

It is advised to use this option when querying small result sets since all results are loaded at once.

Step 1: Follow the steps here to get started with Firebase Firestore on your Android application. This will allow you to add, read and manage your data on Firestore DB.

Step 2: Include the Firebase UI library as a dependency in your grade file.

Step 3: Following the guideline in step 1 to read data from the DB, you can define your query as:

Step 4: Bind the query to the recyclerview as:

Where the model class can be defined as:

Step 5: Define the adapter object and attach it to your recycler view

Important. Remember to add the following listeners in your activity’s lifecycle, otherwise, your recycler view will not be populated when you run the app.

. Disclaimer. Sometimes you may end up with this error on your log trace.

This is because indexes are required for most compound queries in Cloud Firestore. Clicking on the link from the error message will automatically open the index creation UI in the Firebase console with the correct parameters filled in. So far, I have not found an automatic way to resolve this issue. Clicking on the link manually works well.

Special thanks to the article by Nur Rohman and Ankit Suda

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Быстрый старт Data Binding в Android

Введение

Профессионально андроид-разработкой занимаюсь чуть больше года, до этого разрабатывал по Windows Phone и мне понравилась возможность связывать данные из вью модели с самим View при помощи механизма Bindings. А после изучения RX, многие задачи стали решаться более чисто, вью-модель полностью отделилась от View. Она стала оперировать только моделью, совсем не заботясь о том, как она будет отображаться.

В Android такой строгости я не заметил, Activity или Fragment как простейшие представители контроллера чаще всего имеют полный доступ как ко View, так и к модели, зачастуя решая, какой View будет видим, решая таким образом чисто вьюшные задачи. Поэтому я довольно радостно воспринял новость о появлении Data Binding в Android на прошедшем Google IO.

Пока что это только бета релиз, но уже можно протестировать функционал и увидеть направление, в котором двигаются разработчики из Google.

Начало

Я использую Android Studio 1.3. Data binding поддерживает Android 2.1 и выше (API level 7+).

Для сборки используется новый android плагин для Gradle (нужна версия 1.3.0-beta1 и старше). Так как связи отрабатываются во время компиляции, нам понадобиться ещё один плагин к Gradle ‘com.android.databinding:dataBinder:1.0-rc0’. В отличие от того же Windows Phone где механизм привязок реализован глубоко по средством DependencyProperty и в RealTime, в Android эта функция реализуется как бы поверх обычных свойств, во время компиляции и дополнительной кодогенерации, поэтому в случае ошибок будьте готовы разбирать ответ от компилятора.

Итак, заходим в файл build.gradle, который лежит в корневом каталоге проекта (в нём идут настройки Gradle для всего проекта). В блоке dependencies вставляем:

Теперь подключим плагин к конкретному модулю, откроем build.gradle файл, который лежит внутри модуля. По умолчанию app/build.gradle и добавим строчку:

Настройка Layout

Мы должны обернуть наш внешний View в тег
Уже сейчас можно начать его использовать класс Binding для доступа к элементам интерфейса, без использования findViewById. В MainActivity добавим поле и перепишем метод onCreate:

Название поля берётся из Id View, без Id в биндере поле не появиться, если изменить Id View, то поле в биндере сразу же переметнуться. Если с зажатым CTRL нажать на название поля View, то сразу перейдешь к нему в файле разметки. Как по мне так уже одного такого функционала достаточно для того чтобы начать использовать биндинги.

Привязка данных

Например у нас есть карточка пользователя имя и возраст.

Изменим Layout, заменим содержимое LinearLayout на:

И в onCreate заменим последнюю строку на:

Запускаем. Всё работает.
Наверное у всех проектах в активити или в фрагментах встречается такие строчки:

Тут то мы и начинаем использовать непосредственно привязки данных. Перепишем модель:

И добавим в Layout:

На красные выделения студии игнорируем.
Так как мы используем класс View, то его нужно импортировать, добавим в ноду
Или используем его вместе с названием пакета:

Так же возможно в ноде

Конвертеры

Импорт в свою очередь даёт возможность писать конвертеры. Добавим в модель поле с датой рождения и удалим возраст:

Импортируем его в разметку:

Обратная связь и Binding

Попробуем сменить имя пользователя.
Добавим в Layout:

Запускаем и кликаем, тост всплыл, но имя не изменилось. Это случилось из-за того, что модель ни как не известила binder о своём изменении.

Можно создать новую модель и вставить её, но с точки зрения памяти это расточительно:

Или вытащить старую, заменить данные и вставить опять:

Но тогда обновятся все View, связанные с этой моделью. Лучшим вариантом будет связать модель с binder, чтобы она могла его оповестить о своём изменении. Для этого перепишем класс модели, добавив геттеры и сеттеры,

помечая геттеры атрибутом @Bindable, и добавив в сеттеры вызов notifyPropertyChanged(BR.lastName);

Видим новый класс BR, в котором содержатся идентификаторы полей, чьи геттеры помечены атрибутом @Bindable . В Layout оставляем android:text=»@«, меняем только isAdult на adult, c ‘is’ в названии поля возникли проблемы. Запускаем всё работает.

ObservableFields

В пакете android.databinding есть классы, которые могут упростить нотификацию binder об изменении модели:

• Обёртки над элементарными типами
• ObservableField
• ObservableArrayMap
• ObservableArrayList

Попробуем изменить модель:

По коллекциям аналогично, единственное приведу пример обращения ко ключу к Map:

Из View в Model

Теперь попробуем взять новое имя из UI, привязав EditText к некоторой модели. Так как внутри EditText крутится Editable, то и привязать будет к
Изменю MainActivity:

А в разметку добавлю:

Вот тут возникает проблема, если привязать ObservableField к EditText, то всё будет работать только в сторону View. Как я понял, проблема в том, что Editable, который лежит внутри ObservableField, отличается от того, который лежит внутри EditText.

Если у кого есть идеи — делитесь.

Очень любопытно было увидеть библиотеку для поддержки Data Binding в Android от Google. В документации тоже нет информации про обратную связь данных, но я надеюсь на скорую её реализацию. После официального выхода стабильной версии можно будет посмотреть на интеграцию с JavaRX.

[ Оффициальная документация ]
[ Ссылка на мой простенький пример ]

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How to Track Data Usage on Your Android Device

Avoid extra fees and extend your phone’s battery life

What to Know

• Go to Settings >Connections >Data usage >Mobile data usage and tap any app for usage info.
• Tap the toggle at Data usage >Data saver to turn it on.
• Or, try a third-party app, such as one offered by your carrier.

This article demonstrates how to track your data consumption and offers ways to cut down on your data usage without much inconvenience.

Instructions in this article apply to smartphones with Android 10, 9, 8, or 7, with minor variations among manufacturers.

How to Check Data Usage on Android

The instructions below should get you information about your data use.

Open the Settings app.

Tap Connections.

Tap Data usage.

Tap Mobile data usage.

The top of the screen displays your data usage for the current month (as determined by your billing cycle). Tap the date to see previous periods.

Scroll down and tap any app to find out how much data it uses and to control whether it can use mobile data, Wi-Fi, or both.

Go back to Data usage and tap Billing cycle to set the date when your plan resets the monthly billing cycle.

Go to Data usage > Data saver.

Tap the toggle to turn on Data Saver.

Depending on the carrier, phone manufacturer, and Android version, some phones may have additional options for checking data usage.

Third-Party Apps for Tracking Data Usage

There are also third-party apps for monitoring data usage. The four majors carriers offer apps (myAT&T, T-Mobile My Account, Sprint Zone, and My Verizon Mobile) that sync with your account.

Other popular data management apps include My Data Manager and Data Usage. Each app can set up limits and alerts, and My Data Manager tracks data usage in shared or family plans and across multiple devices. Data Usage tracks Wi-Fi usage and predicts when you might go over your data allotment based on daily use. You can set daily, weekly, and monthly data limits too.

Tips for Reducing Data Usage

If your plan has a data limit, upgrading it is not the only way to control overages. Here are a few strategies:

• Most carriers offer shared plans, so team up with your partner, a trusted friend, or family members to save some money.
• Go to the data usage section of the smartphone settings to restrict background data on apps, either one by one or all at once. This way, apps don’t consume data when you’re not using the phone, although it may affect how they work.
• Use Wi-Fi rather than mobile data whenever possible, such as when you’re at home or work.

Beware of unsecured Wi-Fi networks, such as those at coffee shops and other public locations where your privacy could be compromised. If you use public Wi-Fi, consider investing in a hotspot device.

Источник

Android TableView Tutorial and Examples

Android TableView Tutorial.

TableView is an android library that allows us create and work with Tables in android.

It contains a simple TableView and an advanced SortableTableView.

There is both a free and a premium version of tableView.

Requirements of a TableView

TableView requires Android Minimum SDK version of 11 and Compule SDK Version of 25.

Installing TableView

TableView can be installed by adding the following implementation statement in your app leve build.gradle:

Working with TableView

This involves two processes:

1. Addding the TableView Element in Your Layout:

You can modify the number of columns you want your android table to have.

Referencing the TableView:
Then you reference the TableView in your Java code:

Here you can also modify the number of columns you want:

Handling Column Widths

TableView allows you modify the column widths in various manners:

Absolutely Using TableColumnDpWidthModel or TableColumnPxWidthModel
Here’s an example with TableColumnDpWidthModel :

And here’s one with TableColumnPxWidthModel :

Relatively with the TableColumnWeightModel
The defauly column weight is 1.

Showing Data

Data can be shown easily in TableView with help of SimpleTableDataAdapter class.

This allows us easily render two-dimensional string array in a tabular format.

This adapter will turn the strings you supply into TextViews and display them inside TableView at the same position as previous in the 2D-String-Array.

Here’s an example:

Example 1: Android TableView – Fill From Array – With Headers and RowClick

Android has a couple of inbuilt adapterviews like ListView,GridView,RecyclerView and Spinner that are used as the core of most modern apps.And thats pretty good cause most apps consist of Lists of data.

The above generally display lists of data.However,there are situations where you want to use the old fashioned table,with rows and columns.Infact in desktop and web development,with programming languages like Java and C# the tableviews are the most popular.Think components like JTable and DataGridView.

Today we use TableView library by Codecrafters and craft a table with header,rows and columns.Moreover,we handle ItemClicks,showing a toast
message.

We are Building a Vibrant YouTube Community

We have a fast rising YouTube Channel of friends. So far we’ve accumulated almost 3 million agreggate views and more than 10,000 subscribers as of the time of writing this. Here’s the Channel: ProgrammingWizards TV.

Please go ahead subscribe(free obviously) as well. If you have a question or a comment you can post there instead of in this site.People are suggesting us tutorials to do there so you can too.

Before we get into our example, we need to introduce the few classes that we will be using.

What is a String?

Well you know android is coded in java. Java is the primary programming language for android development as of yet.

In our example we will be looking at binding a two-dimensional string array into our TableView. In the process we have a simple TableView with headers, columns and rows.

Java doesn’t have a primitive type for strings. However, there is a class called String that can be used to store and process strings of characters.

Here’s an example of displaying a string literal:

And here’s how to declare a string in java:

Then we can assign it in the following manner:

Or we can have it in a single statement:

What is an Array?

An array is a data structure that behaves like a list of variables with a uniform naming mechanism that can be declared in a single line of simple code.

You use an array to store a sequence of similar data type values. You can for instance have an array of strings or an array of integers.

You can create an array in the following manner:

You can get the length of an array using the length property:

You can initialize an array in the following manner:

What is TableView?

TableView is an android library that allows us create and work with Tables in android.

It contains a simple TableView and an advanced SortableTableView.

There is both a free and a premium version of tableView.

Requirements of a TableView

TableView requires Android Minimum SDK version of 11 and Compule SDK Version of 25.

Installing TableView

TableView can be installed by adding the following implementation statement in your app leve build.gradle:

Working with TableView

This involves two processes:

1. Addding the TableView Element in Your Layout:

You can modify the number of columns you want your android table to have.

Referencing the TableView:
Then you reference the TableView in your Java code:

Here you can also modify the number of columns you want:

Handling Column Widths

TableView allows you modify the column widths in various manners:

Absolutely Using TableColumnDpWidthModel or TableColumnPxWidthModel
Here’s an example with TableColumnDpWidthModel :

And here’s one with TableColumnPxWidthModel :

Relatively with the TableColumnWeightModel
The defauly column weight is 1.

Showing Data

Data can be shown easily in TableView with help of SimpleTableDataAdapter class.

This allows us easily render two-dimensional string array in a tabular format.

This adapter will turn the strings you supply into TextViews and display them inside TableView at the same position as previous in the 2D-String-Array.

Here’s an example:

Let’s look at a full example.

What we do :

• Show a tableview.
• Populate its column headers with data.The header has its own adapter using SimpleTableHeaderAdapter.
• Populate rows with data .It has its own adapter using SimpleTableDataAdapter.
• Change header background color and set its column count.
• Handle ItemClicks for our rows.
• When a row is clicked show a toast with clicked data.

Screenshot

• Here’s the screenshot of the project.

Tools Used

This example was written with the following tools:

• Windows 8
• AndroidStudio IDE
• Genymotion Emulator
• Language : Java

Source Code

Lets jump directly to the source code.

Build.Gradle App Level

• Android Studio has added for us dependencies for AppCompat and Design support libraries.
• Now lets add dependencies for TableView.
• It shall be fetched from online so be connected fro the first time you are adding.

MainActivity.java

Main Responsibility : LAUNCH OUR APP.

• We shall reference the views like TableView here,from our XML Layouts.
• We then initialize our SimpleTableHeaderAdapter and SimpleTableDataAdapters.
• Then pass our data aray to it.
• Header shall take a single dimensional array while the data shall take a multidimensional array.
• Then set them to our tableview.
• Then hande our itemclicks.

ActivityMain.xml

• Inflated as our activity’s view.
• Includes our content main.

ContentMain.xml

• Defines our view hierarchy.
• In this case shall hold our tableview.So please add the below tableview tag with its appropriate properties.

Video/Preview

• We have a YouTube channel with almost a thousand tutorials, this one below being one of them.

How To Run

1. Download the project above.
2. You’ll get a zipped file,extract it.
3. Open the Android Studio.
4. Now close, already open project.
5. From the Menu bar click on File >New> Import Project.
6. Now Choose a Destination Folder, from where you want to import project.
7. Choose an Android Project.
8. Now Click on “OK“.
9. Done, your done importing the project,now edit it.

More Resources

Resource	Link
Source Code	Download
Video Tutorial	YouTube Video

Example 2: Android TableView – Fill With List of Objects – With Headers and RowClick

Android has a couple of inbuilt adapterviews like ListView,GridView,RecyclerView and Spinner that are used as the core of most modern apps.And thats pretty good cause most apps consist of Lists of data.The above generally display lists of data.

However,there are situations where you want to use the old fashioned table,with rows and columns.Infact in desktop and web development,with programming languages like Java and C# the tableviews are the most popular.Think components like JTable and DataGridView.

Today we use TableView library by Codecrafters and craft a table with header,rows and columns.Moreover,we handle ItemClicks,showing a toast message.

We are Building a Vibrant YouTube Community

We have a fast rising YouTube Channel of friends. So far we’ve accumulated almost 3 million agreggate views and more than 10,000 subscribers as of the time of writing this. Here’s the Channel: ProgrammingWizards TV.

Please go ahead subscribe(free obviously) as well. If you have a question or a comment you can post there instead of in this site.People are suggesting us tutorials to do there so you can too.

Before we get into our example, we need to introduce the few classes that we will be using.

What is TableView?

TableView is an android library that allows us create and work with Tables in android.

It contains a simple TableView and an advanced SortableTableView.

There is both a free and a premium version of tableView.

Requirements of a TableView

TableView requires Android Minimum SDK version of 11 and Compule SDK Version of 25.

Installing TableView

TableView can be installed by adding the following implementation statement in your app leve build.gradle:

Working with TableView

This involves two processes:

1. Addding the TableView Element in Your Layout:

You can modify the number of columns you want your android table to have.

Referencing the TableView:
Then you reference the TableView in your Java code:

Here you can also modify the number of columns you want:

Handling Column Widths

TableView allows you modify the column widths in various manners:

Absolutely Using TableColumnDpWidthModel or TableColumnPxWidthModel
Here’s an example with TableColumnDpWidthModel :

And here’s one with TableColumnPxWidthModel :

Relatively with the TableColumnWeightModel
The defauly column weight is 1.

Showing Data

Data can be shown easily in TableView with help of SimpleTableDataAdapter class.

This allows us easily render two-dimensional string array in a tabular format.

This adapter will turn the strings you supply into TextViews and display them inside TableView at the same position as previous in the 2D-String-Array.

Here’s an example:

Let’s look at a full example.

What we do :

• Show a tableview.
• Populate its column headers with data.The header has its own adapter using SimpleTableHeaderAdapter.
• Populate rows with data .It has its own adapter using SimpleTableDataAdapter.
• Change header background color and set its column count.
• Handle ItemClicks for our rows.
• When a row is clicked show a toast with clicked data.

SECTION 1 : Our Dependencies

Build.Gradle

• Android Studio has added for us dependencies for AppCompat library for our AppCompatActivity.
• Now lets add dependencies for TableView.
• It shall be fetched from online so be connected fro the first time you are adding.

SECTION 2 : Our Data Object

Spacecraft.java

• Represents a single object.Here I’ll use Spacecraft.
• The object shall have various properties like name,title,date etc.
• Each object shall occupy a specific row.
• Its corresponding properties then occupy the cells.

SECTION 3 : Our Activity

Main Responsibility : LAUNCH OUR APP.

• We shall reference the views like TableView here,from our XML Layouts.
• We then initialize our SimpleTableHeaderAdapter and SimpleTableDataAdapters.
• Then pass our data aray to it.
• Header shall take a single dimensional array while the data shall take a multidimensional array.
• Then set them to our tableview.
• Then hande our itemclicks.

SECTION 5 : Our Layouts

ActivityMain.xml Layout.

• Inflated as our activity’s view.
• Includes our content main.
• In this case shall hold our tableview.So please add the below tableview tag with its appropriate properties.

Example 3: Android TableView – Fill With HashTable of Objects – With Headers and RowClick

Android has a couple of inbuilt adapterviews like ListView,GridView,RecyclerView and Spinner that are used as the core of most modern apps.And thats pretty good cause most apps consist of Lists of data.

The above generally display lists of data.However,there are situations where you want to use the old fashioned table,with rows and columns.Infact in desktop and web development,with programming languages like Java and C# the tableviews are the most popular.

Think components like JTable and DataGridView. Today we use TableView library by Codecrafters and craft a table with header,rows and columns.Moreover,we handle ItemClicks,showing a toast message.

What we do :

• Show a tableview.
• Populate its column headers with data.The header has its own adapter using SimpleTableHeaderAdapter.
• Populate rows with data .It has its own adapter using SimpleTableDataAdapter.
• Change header background color and set its column count.
• Handle ItemClicks for our rows.
• When a row is clicked show a toast with clicked data.

SECTION 1 : Our Dependencies

Build.Gradle

• Android Studio has added for us dependencies for AppCompat and Design support libraries.
• Note we are using AppCompatActivity.
• Design support libraries are for cordinatorlayout,appbar layout,toolbar and floating action button.All contained in our ActivityMain.xml layout specification.
• Now lets add dependencies for TableView.
• It shall be fetched from online so be connected fro the first time you are adding.

SECTION 2 : Our Data Object

Spacecraft.java

Main Responsibility : IS A SINGLE DATA OBJECT

• Represents a single object.Here I’ll use Spacecraft.
• The object shall have various properties like name,title,date etc.
• Each object shall occupy a specific row.
• Its corresponding properties then occupy the cells.

SECTION 3 : Our Activity

MainActivity class.

Main Responsibility : LAUNCH OUR APP.

• We shall reference the views like TableView here,from our XML Layouts.
• We then initialize our SimpleTableHeaderAdapter and SimpleTableDataAdapters.
• Our data source shall be a hashtable filled with our data objects.
• We read from our hashtable and fill an array.
• Then pass our data array to it.
• Header shall take a single dimensional array while the data shall take a multidimensional array.
• Then set them to our tableview.
• Then hande our itemclicks.

SECTION 4 : Our Layouts

ActivityMain.xml Layout.

• Inflated as our activity’s view.
• Includes our content main.

ContentMain.xml Layout.

• Defines our view hierarchy.
• In this case shall hold our tableview.So please add the below tableview tag with its appropriate properties.

Example 4: Android Swipe Tabs With TableView

This is a practical tutorial meant to allow us work with both Fragments and TableViews. We will also be working TabLayouts and ViewPager.

In the process we make an application that has swipe fragments each containing its own TableView. The user can swipe through the tabs or fragments and have different set of data displayed in their TableViews in each fragment.

Here’s a brief aim of this tutorial:

• The aim is simple and clear.
• We want fragments with TableViews.
• Each tableview has its own unique dataset.
• Now the user can swipe through the fragments or click the tabs.
• We use TabLayout for our material tabs.
• For swiping the general is Viewpager of course.

But first we need understand various terminologies.

What is Android?

Android is a platform that is carefully crafted for mobile devices including smartphones, and tablets.

It is a combination of an operating system, companion native libraries, application runtime, and an application
framework.

Android relies on various open source technologies to provide a solid mobile .platform that can satisfy mobile needs. The platform architecture can be
best described as a series of five main layers that handle different core operations.

We are Building a Vibrant YouTube Community

We have a fast rising YouTube Channel of friends. So far we’ve accumulated almost 3 million agreggate views and more than 10,000 subscribers as of the time of writing this. Here’s the Channel: ProgrammingWizards TV.

Please go ahead subscribe(free obviously) as well. If you have a question or a comment you can post there instead of in this site.People are suggesting us tutorials to do there so you can too.

What is a Fragment?

A Fragment is a piece of an application’s user interface or behavior that can be placed in an Activity.

Interaction with fragments is done through FragmentManager, which can be obtained via Activity.getFragmentManager() and Fragment.getFragmentManager() .

The Fragment class resides in the android.app package.

The main purpose of a Fragment is to represent a particular operation or interface that is running within a larger Activity.

A Fragment can either be defined as part of a layout or created programmatically.

Here’s an example Fragment as part of a layout:

Then that layout can be installed into the MainActivity via java code through inflation:

What is TabLayout?

TabLayout provides a horizontal layout to display tabs.

Then you can fill the tabs to display through TabLayout.Tab instances.

The newTab() method allows us create new Tab instances.

Then you can change the tab’s label using the setText(int) method. On the other hand you can change the Tabs Icon via the setIcon(int) method.

What is ViewPager?

ViewPager is a layout manager that allows the user to flip left and right through pages of data.

You supply an implementation of a PagerAdapter to generate the pages that the view shows.

ViewPager is quite common in applications and normally allows us to implement the popular swipable tabs design.

ViewPager normally has to be defined in the layout:

What is TableView?

TableView is an android library that allows us create and work with Tables in android.

It contains a simple TableView and an advanced SortableTableView.

There is both a free and a premium version of tableView.

Requirements of a TableView

TableView requires Android Minimum SDK version of 11 and Compule SDK Version of 25.

Installing TableView

TableView can be installed by adding the following implementation statement in your app leve build.gradle:

Working with TableView

This involves two processes:

1. Addding the TableView Element in Your Layout:

You can modify the number of columns you want your android table to have.

Referencing the TableView:
Then you reference the TableView in your Java code:

Here you can also modify the number of columns you want:

Handling Column Widths

TableView allows you modify the column widths in various manners:

Absolutely Using TableColumnDpWidthModel or TableColumnPxWidthModel
Here’s an example with TableColumnDpWidthModel :

And here’s one with TableColumnPxWidthModel :

Relatively with the TableColumnWeightModel
The defauly column weight is 1.

Showing Data

Data can be shown easily in TableView with help of SimpleTableDataAdapter class.

This allows us easily render two-dimensional string array in a tabular format.

This adapter will turn the strings you supply into TextViews and display them inside TableView at the same position as previous in the 2D-String-Array.

Here’s an example:

Project Structure

Here’s our project structure:

First we use TableView library,fetch it by adding the following in your build.gradle app level :

Below is an example of fragment :

Then we have our MainActivity as below :

Hey the whole tutorial and demo is here : https://www.youtube.com/watch?v=zRmSeeU2-m0

Resouces	Link
Source Code	GitHub Download
Video Tutorial	YouTube Tutorial

Example 5: Android SQLite TableView

Android SQLite TableView Tutorials and Examples.

How to perform SQLite Database CRUD operations with our adapterview being the TableView.

Android SQLite – TableView – INSERT,SELECT,SHOW

Android SQLite – TableView – INSERT,SELECT,SHOW Tutorial.

This is an android tableview tutorial with SQLite as our database. A tableview renders data into tables: columns and rows. In this tutorial we see how to take advantage of this and use it alongside SQLite database.

SQLite is a local database inbuilt into android devices and persist our data. We shall explore how to INSERT,SELECT and SHOW data to and from the database. The source is provide and its self explanatory and we have video for more explanations.

Screenshot

• Here’s the screenshot of the project.

Android TableView SQLite Example

Android SQlite TableView Example[/caption]

TableView Landscape Mode

Project Structure

Here’s the project structure:

Common Questions this example explores

• Android SQLite Example.
• Android TableView Example.
• How to render data into table in android.
• Table with headers and columns/rows in adroid.
• How to insert into seqlite and retrieve data.

Tools Used

This example was written with the following tools:

• Windows 8
• AndroidStudio IDE
• Genymotion Emulator
• Language : Java
• Topic : TableView, Table Adapter, SQLite CRUD

Libaries Used

• We use codecrafters.tableview.TableView library.

Lets jump directly to the source code.

Build.Gradle

• Normally in android projects, there are two build.gradle files. One is the app level build.gradle, the other is project level build.gradle. The app level belongs inside the app folder and its where we normally add our dependencies and specify the compile and target sdks.
• Also Add dependencies for AppCompat and Design support libraries.
• Our MainActivity shall derive from AppCompatActivity while we shall also use Floating action button from design support libraries.
• We also add our tableview here.

MainActivity.java

• Launcher activity.
• ActivityMain.xml inflated as the contentview for this activity.
• We initialize views and widgets inside this activity.
• We use TableView as our adapterview and SimpleTableAdapter as our adapter.

Spacecraft.java

• Our data object class.
• Represents a single spacecraft object.

Constants.java

• We hold our SQLite constants right here in this class like table name,database name,rows etc.

DBHelper.java

• Our database helper class.
• Ectends SQliteOpenHelper.
• We create database table and upgrade it here.

DBAdapter.java

• Our database adapter class.
• Here’s where we insert,select and return an arraylist of our data.

TableHelper.java

• Binds our arraylist to our tableView.

ActivityMain.xml

• Template layout.
• Contains our ContentMain.xml.
• Also defines the appbarlayout, toolbar as well as floatingaction buttton.

ContentMain.xml

• Content Layout.
• Defines the views and widgets to be displayed inside the MainActivity.
• In this case its a simple tableview.

dialog_layout.xml

• This will be inflated into our nice material input dialog for inserting data to sqlite.

Video/Preview

• Video version of this tutorial here

Download

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