How to set image from Url using AsyncTask?

Question

I\'m a newbie programmer an I\'m making an android program that displays an image on ImageView from a given url. My problem is how do you use this on the AsyncTask?

Thes

Answer 1

Just create a new class "DownloadImageTask" like following one and put it at the same folder where you have your Activity.

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;
import android.widget.ImageView;
import android.os.AsyncTask;
import java.io.*;


public class DownloadImageTask extends AsyncTask {
    ImageView bmImage;

    public DownloadImageTask(ImageView bmImage) {
        this.bmImage = bmImage;
    }

    protected Bitmap doInBackground(String... urls) {
        String urldisplay = urls[0];
        Bitmap myImage = null;
        try {
            InputStream in = new java.net.URL(urldisplay).openStream();
            myImage = BitmapFactory.decodeStream(in);
        } catch (Exception e) {
            Log.e("Error", e.getMessage());
            e.printStackTrace();
        }
        return myImage;
    }

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

After this add line to crate that class in your Activity.

import android.graphics.Bitmap;
import android.os.AsyncTask;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.util.Log;
import android.widget.ImageView;


public class HomeScreen extends ActionBarActivity {

    private final String TAG = "test1";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.d(TAG, "onCreate");
        setContentView(R.layout.activity_home_screen);
        InitHomeScreen();
    }

    protected void InitHomeScreen()
    {
        String imageUrl = "http://s20.postimg.org/4t9w2pdct/logo_android_png.png";
        Log.d(TAG, "Get an Image");
        // Get an Image
        try{
            AsyncTask execute = new DownloadImageTask((ImageView) findViewById(R.id.imageView))
                    .execute(imageUrl);
              // R.id.imageView  -> Here imageView is id of your ImageView
        }
        catch(Exception ex)
        {
        }
    }

   // Other code...

Don't forget to allow access to INTERNET to your Android app.

Check your manifest file.