How to use Android Picasso Library to download images

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

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:padding="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:textAlignment="center"

      android:layout_alignParentBottom="true"

      android:text="Download Image"/>

</RelativeLayout>

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

public class MainActivity extends AppCompatActivity {

   ImageView imageView;

   Button btnDownload;

   @Override

   protected void onCreate(Bundle savedInstanceState) {

      super.onCreate(savedInstanceState);

      setContentView(R.layout.activity_main);

      imageView = findViewById(R.id.imageView);

      btnDownload = findViewById(R.id.btnDownload);

      btnDownload.setOnClickListener(new View.OnClickListener() {

         @Override

         public void onClick(View v) {

            Picasso.with(MainActivity.this)

               .load("https://images.pexels.com/photos/1212487/pexels-photo1212487.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=750&w=1260")

               .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="app.com.sample">

   <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 code example device with your computer. To run the app from the android studio, open one of your project's activity files and click Run  icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen