How to get a bitmap from Url in Android app?

AndroidApps/ApplicationsMobile Development

This example demonstrates how do I get a bitmap from Url in android app.

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.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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="8dp"
   android:orientation="vertical"
   tools:context=".MainActivity">
   <LinearLayout
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:orientation="vertical"
      android:layout_gravity="center">
      <ImageView
         android:layout_width="150dp"
         android:layout_height="150dp"
         android:layout_gravity="center"
         android:layout_margin="15dp"
         android:src="@drawable/image"/>
   </LinearLayout>
   <ImageView
      android:id="@+id/iMageView"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:layout_gravity="center"
      android:layout_margin="20sp"/>
</LinearLayout>

Step 3 – Copy and paste an image (.png/.jpg/.jpeg) into res/drawable

Step 4 − Add the following code to src/MainActivity.java

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ImageView;
import java.io.IOException;
import java.io.InputStream;
public class MainActivity extends AppCompatActivity {
   Bitmap bitmap;
   ImageView image;
   String urlImage = "https://thumbs.dreamstime.com/z/hands-holding-blue-earth-cloud-sky" + "-elements-imag-background-image-furnished-nasa-61052787.jpg";
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      image = findViewById(R.id.iMageView);
      new GetImageFromUrl(image).execute(urlImage);
   }
   public class GetImageFromUrl extends AsyncTask<String, Void, Bitmap>{
      ImageView imageView;
      public GetImageFromUrl(ImageView img){
         this.imageView = img;
      }
      @Override
      protected Bitmap doInBackground(String... url) {
         String stringUrl = url[0];
         bitmap = null;
         InputStream inputStream;
         try {
            inputStream = new java.net.URL(stringUrl).openStream();
            bitmap = BitmapFactory.decodeStream(inputStream);
         } catch (IOException e) {
            e.printStackTrace();
         }
         return bitmap;
      }
      @Override
      protected void onPostExecute(Bitmap bitmap){
         super.onPostExecute(bitmap);
         imageView.setImageBitmap(bitmap);
      }      
   }
}

Step 5 - 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 android studio, open one of your project's activity files and click Run Play Icon  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.

raja
Published on 04-Sep-2019 16:22:23
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