Android Load from Url to Bitmap

How to get bitmap from a url in android?

This is a simple one line way to do it:

    try {
        URL url = new URL("http://....");
        Bitmap image = BitmapFactory.decodeStream(url.openConnection().getInputStream());
    } catch(IOException e) {
        System.out.println(e);
    }

Android load from URL to Bitmap

public static Bitmap getBitmapFromURL(String src) {
    try {
        URL url = new URL(src);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setDoInput(true);
        connection.connect();
        InputStream input = connection.getInputStream();
        Bitmap myBitmap = BitmapFactory.decodeStream(input);
        return myBitmap;
    } catch (IOException e) {
        // Log exception
        return null;
    }
}

Convert url to bitmap in NetworkOnMainThreadException

simply do as below -

public class MyAsync extends AsyncTask<Void, Void, Bitmap>{

    @Override
    protected Bitmap doInBackground(Void... params) {

        try {
            URL url = new URL(src);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setDoInput(true);
            connection.connect();
            InputStream input = connection.getInputStream();
            Bitmap myBitmap = BitmapFactory.decodeStream(input);
            return myBitmap;
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }

    }
}

Now to access the bitmap from url do as below -

MyAsync obj = new MyAsync(){

        @Override
        protected void onPostExecute(Bitmap bmp) {
            super.onPostExecute(bmp);

            Bitmap bm = bmp;
            LinearLayout layout = new LinearLayout(getApplicationContext());
            layout.setLayoutParams(new AbsListView.LayoutParams(250, 250));
            layout.setGravity(Gravity.CENTER);

            ImageView imageView = new ImageView(getApplicationContext());
            imageView.setLayoutParams(new AbsListView.LayoutParams(220, 220));
            imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
            imageView.setImageBitmap(bm);

            layout.addView(imageView);
        }
    };

and then finally execute the AsynTask -

obj.execute();

How to get bitmap from URL using Coil?

You can use target method and cast the drawable to bitmap as

    val loader = ImageLoader(this)
    val req = ImageRequest.Builder(this)
        .data("https://images.dog.ceo/breeds/saluki/n02091831_3400.jpg") // demo link
        .target { result ->
            val bitmap = (result as BitmapDrawable).bitmap
        }
        .build()

    val disposable = loader.enqueue(req)

If you using coroutines then use GetRequest (with overloaded execute method with suspend) in your CoroutineScope as:

  coroutineScope.launch{
    val loader = ImageLoader(this)
    val request = ImageRequest.Builder(this)
        .data("https://images.dog.ceo/breeds/saluki/n02091831_3400.jpg")
        .allowHardware(false) // Disable hardware bitmaps.
        .build()

    val result = (loader.execute(request) as SuccessResult).drawable
    val bitmap = (result as BitmapDrawable).bitmap
}

Cannot convert url to bitmap in Android

You are trying to run network-consuming task in your main thread (what may prevent UI from being refreshed - that's why Android is complaining).

You should start an AsyncTask which you can use to download your image and return in dedicated callback method.

For cases like this, personally, I am using Picasso library. With this tool you can simplify your issue to just few steps as described here.

---

Related Topics