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How to create GridView Layout in an Android App using Kotlin?
This example demonstrates how to create GridView Layout in an Android App 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"?> <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"> <GridView android:id="@+id/gridView" android:layout_width="match_parent" android:layout_height="match_parent" android:numColumns="2" /> </RelativeLayout>
Step 3 − Add the following code to src/MainActivity.kt
import android.os.Bundle import android.widget.AdapterView.OnItemClickListener import android.widget.GridView import android.widget.Toast import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() { lateinit var gridView: GridView private var playerNames = arrayOf("Cristiano Ronaldo", "Joao Felix", "Bernado Silva", "Andre Silve", "Bruno Fernandez", "William Carvalho", "Nelson Semedo", "Pepe", "Rui Patricio") private var playerImages = intArrayOf(R.drawable.ronaldo, R.drawable.felix, R.drawable.bernado, R.drawable.andre, R.drawable.bruno, R.drawable.carvalho, R.drawable.semedo, R.drawable.pepe, R.drawable.patricio) override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) title = "KotlinApp" gridView = findViewById(R.id.gridView) val mainAdapter = MainAdapter(this@MainActivity, playerNames, playerImages) gridView.adapter = mainAdapter gridView.onItemClickListener = OnItemClickListener { _, _, position, _ -> Toast.makeText(applicationContext, "You CLicked " + playerNames[+position], Toast.LENGTH_SHORT).show() } } }
Step 4 − Create a Kotlin class (MyAdapter.kt) and add the following code
import android.content.Context import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import android.widget.BaseAdapter import android.widget.ImageView import android.widget.TextView internal class MainAdapter( private val context: Context, private val numbersInWords: Array<String>, private val numberImage: IntArray ) : BaseAdapter() { private var layoutInflater: LayoutInflater? = null private lateinit var imageView: ImageView private lateinit var textView: TextView override fun getCount(): Int { return numbersInWords.size } override fun getItem(position: Int): Any? { return null } override fun getItemId(position: Int): Long { return 0 } override fun getView( position: Int, convertView: View?, parent: ViewGroup ): View? { var convertView = convertView if (layoutInflater == null) { layoutInflater = context.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater } if (convertView == null) { convertView = layoutInflater!!.inflate(R.layout.rowitem, null) } imageView = convertView!!.findViewById(R.id.imageView) textView = convertView.findViewById(R.id.textView) imageView.setImageResource(numberImage[position]) textView.text = numbersInWords[position] return convertView } }
Step 5 − Create a Layout Resource file (row_item.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="wrap_content" android:layout_height="wrap_content" android:orientation="vertical" android:gravity="center" android:padding="8dp"> <ImageView android:id="@+id/imageView" android:layout_width="100dp" android:layout_height="100dp" /> <TextView android:textAlignment="center" android:gravity="center" android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="16dp" android:text="Numbers" android:layout_marginBottom="10dp" android:textColor="@android:color/background_dark" android:textSize="24sp" android:textStyle="bold" /> </LinearLayout>
Step 6 − 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
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