Friday, August 28, 2015

How to set ImageView image from URL in Android

activity_main.xml

<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#DCDCDC"
    android:padding="24dp"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="DownLoad And Set Image"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ImageView
        android:id="@+id/iv"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginTop="16dp"
        android:scaleType="centerCrop"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button" />

</androidx.constraintlayout.widget.ConstraintLayout>
MainActivity.java

package com.cfsuman.androidtutorials;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.widget.Button;
import android.widget.ImageView;
import java.io.InputStream;
import java.net.URL;


public class MainActivity extends Activity {
        private ImageView mImageView;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.activity_main);

                // Get the widgets reference from XML layout
                Button btn = findViewById(R.id.button);
                mImageView = findViewById(R.id.iv);

                final String imgURL  = "https://images.pexels.com/photos/" +
                        "1337332/pexels-photo-1337332.jpeg";

                btn.setOnClickListener(v -> {
                        new DownLoadImageTask(mImageView).execute(imgURL);
                });
        }


        private class DownLoadImageTask extends AsyncTask<String,Void,Bitmap> {
                ImageView imageView;

                public DownLoadImageTask(ImageView imageView){
                        this.imageView = imageView;
                }

                protected Bitmap doInBackground(String...urls){
                        String urlOfImage = urls[0];
                        Bitmap logo = null;
                        try{
                                InputStream is = new URL(urlOfImage)
                                        .openStream();
                                logo = BitmapFactory.decodeStream(is);
                        }catch(Exception e){ // Catch the download exception
                                e.printStackTrace();
                        }
                        return logo;
                }

                protected void onPostExecute(Bitmap result){
                        imageView.setImageBitmap(result);
                }
        }
}