Load Bitmap from internet in background thread using AsyncTask

This exercise show how to load bitmap from internet.

To load bitmap from internet, we can call the method:
BitmapFactory.decodeStream(networkUrl.openConnection().getInputStream());

BUT we have to do it in background thread other than Main Thread (Refer to the post android.os.NetworkOnMainThreadException). That's why we implement AsyncTask here.

Main Code:

package com.example.androidcolor;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;

import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.widget.ImageView;

public class MainActivity extends Activity {
 
 ImageView targetImage;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        targetImage = (ImageView)findViewById(R.id.target);
        
        //Load bitmap from internet
        String onLineImage = "http://goo.gl/1VArP";
        URL onLineURL;
        
  try {
   onLineURL = new URL(onLineImage);
   new MyNetworkTask(targetImage).execute(onLineURL);
  } catch (MalformedURLException e) {
   e.printStackTrace();
  }
        
    }
    
    private class MyNetworkTask extends AsyncTask<URL, Void, Bitmap>{
     
     ImageView tIV;
     
     public MyNetworkTask(ImageView iv){
      tIV = iv;
     }

  @Override
  protected Bitmap doInBackground(URL... urls) {

   Bitmap networkBitmap = null;
   
   URL networkUrl = urls[0]; //Load the first element
   try {
    networkBitmap = BitmapFactory.decodeStream(
      networkUrl.openConnection().getInputStream());
   } catch (IOException e) {
    e.printStackTrace();
   }

   return networkBitmap;
  }

  @Override
  protected void onPostExecute(Bitmap result) {
   tIV.setImageBitmap(result);
  }

    }

}

layout:

<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:orientation="vertical" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world"
        tools:context=".MainActivity" />
    <ImageView
        android:id="@+id/target"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

</LinearLayout>

Remark: Permission of "android.permission.INTERNET" is needed in AndroidManifest.xml.

Download the files.

Next:
- execute AsyncTask with series of parameters to load image(s) from internet