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Download Image Using AsyncTask In Android

In this tutorial, you will learn how to download an image from a URL address into your Android application. We...

In this tutorial, you will learn how to download an image from a URL address into your Android application. We will create a button and on button click will start an AsyncTask class to begin downloading an image from a URL address. So lets begin…

Create a new project in Eclipse File > New > Android Application Project. Fill in the details and name your project DownloadImageTutorial.

Application Name : DownloadImageTutorial

Project Name : DownloadImageTutorial

Package Name : com.androidbegin.downloadimagetutorial

Open your MainActivity.java and paste the following code.

MainActivity.java

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package com.androidbegin.downloadimagetutorial; import java.io.InputStream; import android.os.AsyncTask; import android.os.Bundle; import android.app.Activity; import android.app.ProgressDialog; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.ImageView; public class MainActivity extends Activity {     // Set your Image URL into a string     String URL = "http://www.androidbegin.com/wp-content/uploads/2013/07/HD-Logo.gif";     ImageView image;     Button button;     ProgressDialog mProgressDialog;     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         // Get the layout from image.xml         setContentView(R.layout.activity_main);         // Locate the ImageView in activity_main.xml         image = (ImageView) findViewById(R.id.image);         // Locate the Button in activity_main.xml         button = (Button) findViewById(R.id.button);         // Capture button click         button.setOnClickListener(new OnClickListener() {             public void onClick(View arg0) {                 // Execute DownloadImage AsyncTask                 new DownloadImage().execute(URL);             }         });     }     // DownloadImage AsyncTask     private class DownloadImage extends AsyncTask<String, Void, Bitmap> {         @Override         protected void onPreExecute() {             super.onPreExecute();             // Create a progressdialog             mProgressDialog = new ProgressDialog(MainActivity.this);             // Set progressdialog title             mProgressDialog.setTitle("Download Image Tutorial");             // Set progressdialog message             mProgressDialog.setMessage("Loading...");             mProgressDialog.setIndeterminate(false);             // Show progressdialog             mProgressDialog.show();         }         @Override         protected Bitmap doInBackground(String... URL) {             String imageURL = URL[0];             Bitmap bitmap = null;             try {                 // Download Image from URL                 InputStream input = new java.net.URL(imageURL).openStream();                 // Decode Bitmap                 bitmap = BitmapFactory.decodeStream(input);             } catch (Exception e) {                 e.printStackTrace();             }             return bitmap;         }         @Override         protected void onPostExecute(Bitmap result) {             // Set the bitmap into ImageView             image.setImageBitmap(result);             // Close progressdialog             mProgressDialog.dismiss();         }     } }

In this activity, we have created a Button and an ImageView and on button click will show a progress dialog and start the Download Image AsyncTask class. The download image will be decoded into a bitmap and set into an ImageView. In this tutorial, we’ve hosted the sample image GIF file in our server. Click on this link to see the sample image. http://www.androidbegin.com/wp-content/uploads/2013/07/HD-Logo.gif

Next, create an XML file for your MainActivity graphical layout. Go to res > layout > Right Click on layout > New > Android XML File

Name your new XML file activity_main.xml and paste the following code.

activity_main.xml

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<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" >     <ImageView         android:id="@+id/image"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_centerHorizontal="true"         android:layout_centerVertical="true" >     </ImageView>     <Button         android:id="@+id/button"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:layout_below="@+id/image"         android:layout_centerHorizontal="true"         android:layout_centerVertical="true"         android:text="@string/button" /> </RelativeLayout>

Next, change the application name and texts. Open your strings.xml in your res > values folder and paste the following code.
strings.xml

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<resources>     <string name="app_name">Download Image Tutorial</string>     <string name="menu_settings">Settings</string>     <string name="button">Download Image</string> </resources>

In your AndroidManifest.xml, we need to declare a permission to connect to the Internet. Open your AndroidManifest.xml and paste the following code.

AndroidManifest.xml

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<manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="com.androidbegin.downloadimagetutorial"     android:versionCode="1"     android:versionName="1.0" >     <uses-sdk         android:minSdkVersion="8"         android:targetSdkVersion="15" />     <uses-permission android:name="android.permission.INTERNET" >     </uses-permission>     <application         android:icon="@drawable/ic_launcher"         android:label="@string/app_name"         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>

Output :

Source Code 

DownloadImageTutorial (167.1 KiB, 339 downloads)