How to create Focusable EditText inside ListView on Android using Kotlin?

Kotlin Android Apps/Applications Mobile Development

This example demonstrates how to create Focusable EditText inside ListView on Android using Kotlin.

Step 1 − Create a new project in Android Studio, go to File ? New Project and fill all required details to create a new project.

Step 2 − Add the following code to res/layout/activity_main.xml.

Example

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
   android:orientation="vertical"
   android:padding="4dp"
   tools:context=".MainActivity">
<ListView
   android:id="@+id/listView"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   android:descendantFocusability="beforeDescendants" />
</LinearLayout>

Step 3 − Add the following code to src/MainActivity.kt

import androidx.appcompat.app.AppCompatActivity
import android.annotation.SuppressLint
import android.app.LauncherActivity
import android.content.Context
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.BaseAdapter
import android.widget.EditText
import android.widget.ListView
import java.util.ArrayList
class MainActivity : AppCompatActivity() {
   private lateinit var listView: ListView
   private lateinit var myAdapter: MyAdapter
   override fun onCreate(savedInstanceState: Bundle?) {
      super.onCreate(savedInstanceState)
      setContentView(R.layout.activity_main)
      title = "KotlinApp"
      listView = findViewById(R.id.listView)
      listView.itemsCanFocus = true
      myAdapter = MyAdapter()
      listView.adapter = myAdapter
   }
   private inner class MyAdapter internal constructor() : BaseAdapter() {
      private var layoutInflater: LayoutInflater = getSystemService(Context.LAYOUT_INFLATER_SERVICE) as
      LayoutInflater
      internal var myItems = ArrayList<LauncherActivity.ListItem>()
      lateinit var context: Context
      init {
         for (i in 0..6) {
            val listItem = LauncherActivity.ListItem()
            listItem.className = "Caption$i"
            myItems.add(listItem)
         }
         notifyDataSetChanged()
      }
      override fun getItem(position: Int): Any {
         return position
      }
      override fun getItemId(position: Int): Long {
         return position.toLong()
      }
      override fun getCount(): Int {
         return myItems.size
      }
      @SuppressLint("InflateParams")
      override fun getView(position: Int, convertView: View?, parent: ViewGroup): View? {
         var convertView: View? = convertView
         val holder: ViewHolder
         if (convertView == null) {
            holder = ViewHolder()
            convertView = layoutInflater.inflate(R.layout.list, null)
            holder.caption = convertView.findViewById(R.id.ItemCaption)
            convertView.setTag(holder)
         } else {
            holder = convertView.tag as ViewHolder
         }
         holder.caption.setText(myItems.get(position).className)
         holder.caption.id = position
         holder.caption.onFocusChangeListener = View.OnFocusChangeListener { v, hasFocus ->
            if (!hasFocus) {
               val position = v.id
               val caption = v as EditText
               myItems[position].className = caption.text.toString()
            }
         }
         return convertView
      }
   }
   internal inner class ViewHolder {
      lateinit var caption: EditText
   }
}

Step 4 − Create a layout resource file (list.xml) and add the following code

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:orientation="vertical"
   android:paddingStart="4dp">
<EditText
   android:id="@+id/ItemCaption"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:layout_marginStart="2dip"
   android:singleLine="true" />
</LinearLayout>

Step 5 − Add the following code to androidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.q11">
   <application
      android:allowBackup="true"
      android:icon="@mipmap/ic_launcher"
      android:label="@string/app_name"
      android:roundIcon="@mipmap/ic_launcher_round"
      android:supportsRtl="true"
      android:theme="@style/AppTheme">
      <activity android:name=".MainActivity">
         <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
      </activity>
   </application>
</manifest>

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click the Run icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen

Click here to download the project code.

Azhar

Published on 21-Jul-2020 12:33:14

Previous Page Print Page