How to use Android Picasso library to download images using Kotlin?

This example demonstrates how to use the Android Picasso library to download images 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.

Add the following dependency to the build gradle (Module: app)

implementation 'com.squareup.picasso:picasso:2.4.0'

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

<?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"    android:paddingBottom="4dp"    tools:context=".MainActivity">    <ImageView       android:id="@+id/imageView"       android:layout_width="match_parent"       android:layout_height="match_parent"       android:layout_above="@id/btnDownload" />    <Button       android:id="@+id/btnDownload"       android:layout_width="match_parent"       android:layout_height="wrap_content"       android:layout_alignParentBottom="true"       android:text="Download Image"       android:textAlignment="center" /> </RelativeLayout>

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

import android.os.Bundle import android.widget.Button import android.widget.ImageView import androidx.appcompat.app.AppCompatActivity import com.squareup.picasso.Picasso class MainActivity : AppCompatActivity() {    lateinit var imageView: ImageView    lateinit var btnDownload: Button    override fun onCreate(savedInstanceState: Bundle?) {       super.onCreate(savedInstanceState)       setContentView(R.layout.activity_main)       title = "KotlinApp"       imageView = findViewById(R.id.imageView)       btnDownload = findViewById(R.id.btnDownload)       btnDownload.setOnClickListener {          Picasso.with(this)          .load("https://images.unsplash.com/photo-1555083892-97490c72c90c?ixlib=rb-1.2.1&w=1000&q=80")          .into(imageView);       }    } }

Step 4 − 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"> <uses-permission android:name="android.permission.INTERNET" />    <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.