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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
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import com.squareup.picasso.Picasso;
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 Mobile 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 −
Click here to download the project code.
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