ListView In Android

"ListView"

Hi friends, Today we are going to learn what is listView and how to implement in android?

ListView is group of items and all items are display in vertical scrollable view. The list items are inserted in listview by using adapter. Here using ArrayAdapter and We will learn Base adapter in next tutorial.

Lets start to implement listview with array adapter in android.

• Create one layout file that contains following code. Here the name of file is "activity_main.xml"

<?xml version="1.0" encoding="utf-8"?> <relativelayout 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"> <ListView android:id="@+id/list_demo" android:layout_width="match_parent" android:layout_height="match_parent" /> </RelativeLayout>

In above file we have added ListView and set an id "list_demo".

• Now create one java file and paste the following code. Here the name of file is "MainActivity.java"

package com.beauty.listviewdemo; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.widget.ArrayAdapter; import android.widget.ListView; import java.util.ArrayList; public class MainActivity extends AppCompatActivity { //Create ListView object private ListView list_demo; //create array list object private ArrayList<string> list_items; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //Initialize view list_demo = findViewById(R.id.list_demo); //initialize arraylis list_items = new ArrayList<>(); //add list items in array list list_items.add("First List Item"); list_items.add("Secound List Item"); list_items.add("Third List Item"); list_items.add("Fourth List Item"); list_items.add("Fifth List Item"); list_items.add("Sixth List Item"); //Create Array Adapter for listview ArrayAdapter<string> listAdapter = new ArrayAdapter<>(this,android.R.layout.simple_list_item_1,list_items); //set adapter to listview list_demo.setAdapter(listAdapter); } }

After executing the above code, it will show one list that contains six items in vertical scrollable view.

• To get an selected item from list use the following code.

list_demo.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) { String SelectedItem = list_demo.getItemAtPosition(i).toString(); Toast.makeText(MainActivity.this, "You are selected : "+SelectedItem, Toast.LENGTH_SHORT).show(); } });

• To delete an list item by long press on listview item use the following code snippets. The listAdapter.notifyDataSetChanged(); used to refresh list after removing data from ListView.

//Delete item on Long press list_demo.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() { @Override public boolean onItemLongClick(AdapterView<?> adapterView, View view, int pos, long l) { final int position = pos; AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this); builder.setTitle("Delete Item") .setMessage("Are you sure to delete?") .setPositiveButton("Yes", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialogInterface, int i) { list_items.remove(position); listAdapter.notifyDataSetChanged(); } }) .setNegativeButton("No", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialogInterface, int i) { } }); AlertDialog alertDialog = builder.create(); alertDialog.show(); return true; } });

In next tutorial will learn about custom listview and BaseAdapter.
Enjoy coding!😊

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