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Android from Scratch | ListView With ArrayAdapter
Android from Scratch | ListView With ArrayAdapter


ArrayAdapter  |  Android Developers

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  • Summary of article content: Articles about ArrayAdapter  |  Android Developers You can use this adapter to prove views for an AdapterView , Returns a view for each object in a collection of data objects you prove, … …
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Summary

Public constructors

Public methods

ArrayAdapter  |  Android Developers
ArrayAdapter  |  Android Developers

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Tạo Listview bằng ArrayAdapter

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    Tạo Listview bằng ArrayAdapter
    Tạo Listview bằng ArrayAdapter. Hướng dẫn : • Mô tả ứng dụng: – Hiển thị danh sách các quốc gia với các thông … …
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    Tạo Listview bằng ArrayAdapter
    Tạo Listview bằng ArrayAdapter. Hướng dẫn : • Mô tả ứng dụng: – Hiển thị danh sách các quốc gia với các thông … Bài tập được trích từ chương trình Lập trình viên Android của Trung tâm Tin học ĐH Khoa học Tự nhiên. Thực hiện bài tập này, các bạn tự học lập trình có thể tạo danh sách trên Listview với ArrayAdapter và tùy biến giao diện ListView một cách dễ dàng.tự học lập trình, học lập trình android, học lập trình android cơ bản, học lập trình di động, tu hoc lap trinh, hoc lap trinh android, hoc lap trinh android co ban, hoc lap trinh di dong, tạo listview bằng arrayadapter
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Bước 1 Xây dựng Project với AndroidStudio

Bước 2

Bước 3 Xây dựng class Coutry

Bước 4 Xây dựng lớp CustomArrayAdapter kế thừa từ ArrayAdapter để hiển thị dữ liệu lên listView

Bước 5 Viết code cho MainActivity

Bước 6 Chạy và kiểm tra kết quả


	Tạo Listview bằng ArrayAdapter
Tạo Listview bằng ArrayAdapter

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Lập trình Android – ArrayAdapter

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  • Summary of article content: Articles about Lập trình Android – ArrayAdapter ArrayAdapter trong Andro. Một ListAdapter có thể quản lí một ListView chứa danh sách các phần tử có kiểu bất kì. Việc rất đơn giản, bạn chỉ cần “móc nối” … …
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Lập trình Android - ArrayAdapter
Lập trình Android – ArrayAdapter

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Using an ArrayAdapter with ListView | CodePath Android Cliffnotes

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  • Summary of article content: Articles about Using an ArrayAdapter with ListView | CodePath Android Cliffnotes In Andro development, any time we want to show a vertical list of scrollable items we will use a ListView which has data populated using an Adapter . …
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  • Table of Contents:

Row View Recycling

Using a Basic ArrayAdapter

Using a Custom ArrayAdapter

Attaching the Adapter to a ListView

Populating Data into ListView

Attaching Event Handlers Within Adapter

Improving Performance with the ViewHolder Pattern

References

Using an ArrayAdapter with ListView | CodePath Android Cliffnotes
Using an ArrayAdapter with ListView | CodePath Android Cliffnotes

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ArrayAdapter in Android with Example – GeeksforGeeks

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  • Summary of article content: Articles about ArrayAdapter in Android with Example – GeeksforGeeks context: public ArrayAdapter(this, int resource, int textViewResourceId, T[] objects) · resource: · textViewResourceId: · objects: · Step 1: Create … …
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XML

XML

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ArrayAdapter in Android with Example - GeeksforGeeks
ArrayAdapter in Android with Example – GeeksforGeeks

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Android từ đầu: Hiểu về Adapter và Adapter View

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  • Summary of article content: Articles about Android từ đầu: Hiểu về Adapter và Adapter View Ngoài ra, vì lớp ArrayAdapter chỉ có thể làm việc với chuỗi, nên bạn cần phải chắc chắn rằng Layout của các đối tượng View được tạo ra có … …
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    Adapter View ở khắp mọi nơi và bạn sẽ khó mà tìm thấy một ứng dụng Android phổ biến mà không sử dụng chúng. Tên nghe có vẻ lạ, nhưng nếu bạn nghĩ rằng bạn chưa bao giờ nhìn thấy một Adapter View,…
  • Table of Contents:

1 Adapter là gì

2 Adapter View làm việc như thế nào

3 Tạo một ArrayAdapter

4 Tạo một List

5 Tạo một Grid

6 Thêm Event Listener

7 Thừa kế ArrayAdapter

8 Sử dụng một View Holder

Tổng kết

Android từ đầu: Hiểu về Adapter và Adapter View
Android từ đầu: Hiểu về Adapter và Adapter View

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ArrayAdapter in android to create simple listview – Stack Overflow

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ArrayAdapter in android to create simple listview - Stack Overflow
ArrayAdapter in android to create simple listview – Stack Overflow

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core/java/android/widget/ArrayAdapter.java – platform/frameworks/base – Git at Google

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core/java/android/widget/ArrayAdapter.java - platform/frameworks/base - Git at Google
core/java/android/widget/ArrayAdapter.java – platform/frameworks/base – Git at Google

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ArrayAdapter Tutorial With Example In Android Studio | Abhi Android

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Using an ArrayAdapter with ListView

In Android development, any time we want to show a vertical list of scrollable items we will use a ListView which has data populated using an Adapter . The simplest adapter to use is called an ArrayAdapter because the adapter converts an ArrayList of objects into View items loaded into the ListView container.

The ArrayAdapter fits in between an ArrayList (data source) and the ListView (visual representation) and configures two aspects:

Which array to use as the data source for the list

How to convert any given item in the array into a corresponding View object

Note as shown above that there are other data sources besides an ArrayAdapter such as the CursorAdapter which instead binds directly to a result set from a Local SQLite Database.

Row View Recycling

When using an adapter and a ListView , we need to make sure to understand how view recycling works.

When your ListView is connected to an adapter, the adapter will instantiate rows until the ListView has been fully populated with enough items to fill the full height of the screen. At that point, no additional row items are created in memory.

Instead, as the user scrolls through the list, items that leave the screen are kept in memory for later use and then every new row that enters the screen reuses an older row kept around in memory. In this way, even for a list of 1000 items, only ~7 item view rows are ever instantiated or held in memory. Here is a visual overview of recycling:

Here is another related diagram on view recycling:

Refer to this ListView guide for another look at how this works to optimize the performance of your lists. Be sure to check out this Udacity video on view recycling as well. If you wish to evaluate how fast your ListView is rendering, check out the Profiling GPU tool, which provides a graphical way of visualizing the layout performance.

Using a Basic ArrayAdapter

To use a basic ArrayAdapter , you just need to initialize the adapter and attach the adapter to the ListView. First, we initialize the adapter:

ArrayAdapter < String > itemsAdapter = new ArrayAdapter < String >( this , android . R . layout . simple_list_item_1 , items );

The ArrayAdapter requires a declaration of the type of the item to be converted to a View (a String in this case) and then accepts three arguments: context (activity instance), XML item layout, and the array of data. Note that we’ve chosen simple_list_item_1.xml which is a simple TextView as the layout for each of the items.

Now, we just need to connect this adapter to a ListView to be populated:

ListView listView = ( ListView ) findViewById ( R . id . lvItems ); listView . setAdapter ( itemsAdapter );

By default, this will now convert each item in the data array into a view by calling toString on the item and then assigning the result as the value of a TextView (simple_list_item_1.xml) that is displayed as the row for that data item. If the app requires a more complex translation between item and View then we need to create a custom ArrayAdapter instead.

Using a Custom ArrayAdapter

When we want to display a series of items from a list using a custom representation of the items, we need to use our own custom XML layout for each item. To do this, we need to create our own custom ArrayAdapter class. See this repo for the source code. First, we often need to define a model to represent the data within each list item.

Defining the Model

Given a Java object that has certain fields defined such as a User class:

public class User { public String name ; public String hometown ; public User ( String name , String hometown ) { this . name = name ; this . hometown = hometown ; } }

We can create a custom ListView of User objects by subclassing ArrayAdapter to describe how to translate the object into a view within that class and then using it like any other adapter.

Creating the View Template

Next, we need to create an XML layout that represents the view template for each item in res/layout/item_user.xml :

Defining the Adapter

Next, we need to define the adapter to describe the process of converting the Java object to a View (in the getView method). The naive approach to this (without any view caching) looks like the following:

public class UsersAdapter extends ArrayAdapter < User > { public UsersAdapter ( Context context , ArrayList < User > users ) { super ( context , 0 , users ); } @Override public View getView ( int position , View convertView , ViewGroup parent ) { // Get the data item for this position User user = getItem ( position ); // Check if an existing view is being reused, otherwise inflate the view if ( convertView == null ) { convertView = LayoutInflater . from ( getContext ()). inflate ( R . layout . item_user , parent , false ); } // Lookup view for data population TextView tvName = ( TextView ) convertView . findViewById ( R . id . tvName ); TextView tvHome = ( TextView ) convertView . findViewById ( R . id . tvHome ); // Populate the data into the template view using the data object tvName . setText ( user . name ); tvHome . setText ( user . hometown ); // Return the completed view to render on screen return convertView ; } }

That adapter has a constructor and a getView() method to describe the translation between the data item and the View to display.

getView() is the method that returns the actual view used as a row within the ListView at a particular position. Another method used is getItem() which is already present in the ArrayAdapter class and its task is to simply get the data item associated with the specified position in the data set which is associated with that ArrayAdapter .

Attaching the Adapter to a ListView

Now, we can use that adapter in the Activity to display an array of items into the ListView:

// Construct the data source ArrayList < User > arrayOfUsers = new ArrayList < User >(); // Create the adapter to convert the array to views UsersAdapter adapter = new UsersAdapter ( this , arrayOfUsers ); // Attach the adapter to a ListView ListView listView = ( ListView ) findViewById ( R . id . lvItems ); listView . setAdapter ( adapter );

At this point, the ListView is now successfully bound to the users array data.

Populating Data into ListView

Once the adapter is attached, items will automatically be populated into the ListView based on the contents of the array. You can add new items to the adapter at any time with:

// Add item to adapter User newUser = new User ( “Nathan” , “San Diego” ); adapter . add ( newUser ); // Or even append an entire new collection // Fetching some data, data has now returned // If data was JSON, convert to ArrayList of User objects. JSONArray jsonArray = …; ArrayList < User > newUsers = User . fromJson ( jsonArray ) adapter . addAll ( newUsers );

which will append the new items to the list. You can also clear the entire list at any time with:

adapter . clear ();

Using the adapter now, you can add, remove and modify users and the items within the ListView will automatically reflect any changes.

Constructing Models from External Source

In order to create model instances, you will likely be loading the data from an external source (i.e database or REST JSON API), so you should create two additional methods in each model to allow for construction of a list or a singular item if the data is coming from a JSON API:

public class User { // Constructor to convert JSON object into a Java class instance public User ( JSONObject object ){ try { this . name = object . getString ( “name” ); this . hometown = object . getString ( “hometown” ); } catch ( JSONException e ) { e . printStackTrace (); } } // Factory method to convert an array of JSON objects into a list of objects // User.fromJson(jsonArray); public static ArrayList < User > fromJson ( JSONArray jsonObjects ) { ArrayList < User > users = new ArrayList < User >(); for ( int i = 0 ; i < jsonObjects . length (); i ++) { try { users . add ( new User ( jsonObjects . getJSONObject ( i ))); } catch ( JSONException e ) { e . printStackTrace (); } } return users ; } } For more details, check out our guide on converting JSON into a model. If you are not using a JSON source for your data, you can safely skip this step. Attaching Event Handlers Within Adapter Within a ListView , we can easily attach event listeners onto any of the views that are item position-aware with: public class UsersAdapter extends ArrayAdapter < User > { // … @Override public View getView ( int position , View convertView , ViewGroup parent ) { // … // Lookup view for data population Button btButton = ( Button ) convertView . findViewById ( R . id . btButton ); // Cache row position inside the button using `setTag` btButton . setTag ( position ); // Attach the click event handler btButton . setOnClickListener ( new View . OnClickListener () { @Override public void onClick ( View view ) { int position = ( Integer ) view . getTag (); // Access the row position here to get the correct data item User user = getItem ( position ); // Do what you want here… } }); // … other view population as needed… // Return the completed view return convertView ; } }

You can also similarly pass an entire object through a tag as well as shown here:

// Inside adapter `getView` method User user = getItem ( position ); // Cache user object inside the button using `setTag` btButton . setTag ( user ); // Attach the click event handler btButton . setOnClickListener ( new View . OnClickListener () { @Override public void onClick ( View view ) { // Access user from within the tag User user = ( User ) view . getTag (); // Do what you want here… } });

With this approach, you can easily access data as needed from within any event handlers.

Improving Performance with the ViewHolder Pattern

To improve performance, we should modify the custom adapter by applying the ViewHolder pattern which speeds up the population of the ListView considerably by caching view lookups for smoother, faster item loading:

public class UsersAdapter extends ArrayAdapter < User > { // View lookup cache private static class ViewHolder { TextView name ; TextView home ; } public UsersAdapter ( Context context , ArrayList < User > users ) { super ( context , R . layout . item_user , users ); } @Override public View getView ( int position , View convertView , ViewGroup parent ) { // Get the data item for this position User user = getItem ( position ); // Check if an existing view is being reused, otherwise inflate the view ViewHolder viewHolder ; // view lookup cache stored in tag if ( convertView == null ) { // If there’s no view to re-use, inflate a brand new view for row viewHolder = new ViewHolder (); LayoutInflater inflater = LayoutInflater . from ( getContext ()); convertView = inflater . inflate ( R . layout . item_user , parent , false ); viewHolder . name = ( TextView ) convertView . findViewById ( R . id . tvName ); viewHolder . home = ( TextView ) convertView . findViewById ( R . id . tvHome ); // Cache the viewHolder object inside the fresh view convertView . setTag ( viewHolder ); } else { // View is being recycled, retrieve the viewHolder object from tag viewHolder = ( ViewHolder ) convertView . getTag (); } // Populate the data from the data object via the viewHolder object // into the template view. viewHolder . name . setText ( user . name ); viewHolder . home . setText ( user . hometown ); // Return the completed view to render on screen return convertView ; } }

In this example, we also have a private static class called ViewHolder . Making calls to findViewById() can be slow in practice, and if your adapter has to call it for each View in your row for every single row then you can often run into performance issues. What the ViewHolder class does is cache the call to findViewById() . Once your ListView has reached the max amount of rows it can display on a screen, Android is smart enough to begin recycling those row Views. We check if a View is recycled with if (convertView == null) . If it is not null then we have a recycled View and can just change its values, otherwise, we need to create a new row View. The magic behind this is the setTag() method which lets us attach an arbitrary object onto a View object, which is how we save the already inflated View for future reuse.

Beyond ViewHolders

Customizing Android ListView Rows by Subclassing describes a strategy for obtaining instances of child views using a similar approach as a ViewHolder but without the explicit ViewHolder subclass.

References

ArrayAdapter in Android with Example

The Adapter acts as a bridge between the UI Component and the Data Source. It converts data from the data sources into view items that can be displayed into the UI Component. Data Source can be Arrays, HashMap, Database, etc. and UI Components can be ListView, GridView, Spinner, etc. ArrayAdapter is the most commonly used adapter in android. When you have a list of single type items which are stored in an array you can use ArrayAdapter. Likewise, if you have a list of phone numbers, names, or cities. ArrayAdapter has a layout with a single TextView. If you want to have a more complex layout instead of ArrayAdapter use CustomArrayAdapter. The basic syntax for ArrayAdapter is given as:

public ArrayAdapter(Context context, int resource, int textViewResourceId, T[] objects)

Parameters

Parameters Description context The current context. This value can not be null. resource The resource ID for the layout file containing a layout to use when instantiating views. textViewResourceId The id of the TextView within the layout resource to be populated. objects The objects to represent in the ListView. This value cannot be null.

context: It is used to pass the reference of the current class. Here ‘this’ keyword is used to pass the current class reference. Instead of ‘this’ we could also use the getApplicationContext() method which is used for the Activity and the getApplication() method which is used for Fragments.

public ArrayAdapter(this, int resource, int textViewResourceId, T[] objects)

resource: It is used to set the layout file(.xml files) for the list items.

public ArrayAdapter(this, R.layout.itemListView, int textViewResourceId, T[] objects)

textViewResourceId: It is used to set the TextView where you want to display the text data.

public ArrayAdapter(this, R.layout.itemListView, R.id.itemTextView, T[] objects)

objects: These are the array object which is used to set the array element into the TextView.

String courseList[] = {“C-Programming”, “Data Structure”, “Database”, “Python”, “Java”, “Operating System”,”Compiler Design”, “Android Development”}; ArrayAdapter arrayAdapter = new ArrayAdapter(this, R.layout.itemListView, R.id.itemTextView, courseList[]);

Example

In this example, the list of courses is displayed using a simple array adapter. Note that we are going to implement this project using the Java language.

Step 1: Create a New Project

To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio. Note that select Java as the programming language.

Step 2: Working with the activity_main.xml file

Go to the layout folder and in activity_main.xml file change the ConstraintLayout to RelativeLayout and insert a ListView with id simpleListView. Below is the code for the activity_main.xml file.

XML

< RelativeLayout xmlns:android = "http://schemas.android.com/apk/res/android" xmlns:tools = "http://schemas.android.com/tools" android:layout_width = "match_parent" android:layout_height = "match_parent" tools:context = ".MainActivity" > < ListView android:id = "@+id/simpleListView" android:layout_width = "match_parent" android:layout_height = "wrap_content" />

Step 3: Create a new layout file

Go to app > res > layout > right-click > New > Layout Resource File and create a new layout file and name this file as item_view.xml and make the root element as a LinearLayout. This will contain a TextView that is used to display the array objects as output.

XML

< LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" android:layout_width = "match_parent" android:layout_height = "match_parent" android:orientation = "vertical" > < TextView android:id = "@+id/itemTextView" android:layout_width = "match_parent" android:layout_height = "wrap_content" android:layout_gravity = "center" />

Step 4: Working with the MainActivity.java file

Now go to the java folder and in MainActivity.java and provide the implementation to the ArrayAdapter. Below is the code for the MainActivity.java file.

Java

import android.os.Bundle; import android.widget.ArrayAdapter; import android.widget.ListView; import androidx.appcompat.app.AppCompatActivity; public class MainActivity extends AppCompatActivity { ListView simpleListView; String courseList[] = { “C-Programming” , “Data Structure” , “Database” , “Python” , “Java” , “Operating System” , “Compiler Design” , “Android Development” }; @Override protected void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); setContentView(R.layout.activity_main); simpleListView = (ListView) findViewById(R.id.simpleListView); ArrayAdapter arrayAdapter = new ArrayAdapter( this , R.layout.item_view, R.id.itemTextView, courseList); simpleListView.setAdapter(arrayAdapter); } }

Output: Run on Emulator

ArrayAdapter in android to create simple listview

I tried to create an Activity in Android, This Activity only contains a ListView nothing else.

As I know to fill the listview we need to use an ArrayAdapter .

So to understand the ArrayAdapter I have read the following link:

http://developer.android.com/reference/android/widget/ArrayAdapter.html

But still I am unable to understand it clearly!

One of the biggest doubt is why the constructor needs a TextView resource id while my activity is not having any TextViews what I should have to give it?

I am not saying that this is the only constructor, just that I’m unable to understand the logic behind it.

In order to create a simple listview I also referred to the following link:

Simple ListView using ArrayAdapter example.

But again my main doubt is why it does it need a TextView resource id?

If anybody can explain it with an example it will be very helpful.

EDIT:

So you have finished reading the arrayadapter topic article, if you find this article useful, please share it. Thank you very much. See more: ArrayAdapter Kotlin, ArrayAdapter android, Custom ArrayAdapter, Arrayadapter là gì, Recyclerview with arrayadapter, Android arrayadapter example, Convert list to arrayadapter, Custom ArrayAdapter in Android

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