How to download a image from URL in App

I'd like to know how I can download an Image from a given URL and display it inside an ImageView. And is there any permissions required to ment开发者_开发知识库ion in the manifest.xml file?

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You need to put this permission to access the Internet

<uses-permission android:name="android.permission.INTERNET" />

you can try this code.

String imageurl = "YOUR URL";
InputStream in = null;

try 
{
    Log.i("URL", imageurl);
    URL url = new URL(imageurl);
    URLConnection urlConn = url.openConnection();
    HttpURLConnection httpConn = (HttpURLConnection) urlConn;
    httpConn.connect();

    in = httpConn.getInputStream();
} 
catch (MalformedURLException e) 
{
    e.printStackTrace();
} 
catch (IOException e) 
{
    e.printStackTrace();
}
Bitmap bmpimg = BitmapFactory.decodeStream(in);
ImageView iv = "YOUR IMAGE VIEW";
iv.setImageBitmap(bmpimg);  

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Use background thread to get image and after getting image set it in imageview using hanndler.

new Thread(){
     public void run() {
        try {
            Bitmap bitmap = BitmapFactory.decodeStream(new URL("http://imageurl").openStream());
            Message msg = new Message();
            msg.obj = bitmap;
            imageHandler.sendMessage(msg);
         } catch (Exception e) {
            e.printStackTrace();
         } 
     }
 }.start();

Handler code where we set downloaded image in imgaeview.

Handler imageHandler = new Handler(){
    public void handleMessage(Message msg) {
        if(msg.obj!=null && msg.obj instanceof Bitmap){
            imageview.setBackgroundDrawable(new BitmapDrawable((Bitmap)msg.obj));
        }

    };
};

And ofcourse you need internet permission.

<uses-permission android:name="android.permission.INTERNET" />

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You need to set usage permission of INTERNET in android manifest file and use java.net.URL and java.net.URLConnection classes to request the URL.

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There is the BitmapFactory-class which can do that. It can create a Bitmap-object from an InputStream, which can then be displayed in an ImageView.

Something you should know is, that using a normal URLConnection to get an InputStream on a URL-object does not always work with the bitmap-factory. A work-around is presented here: Android: Bug with ThreadSafeClientConnManager downloading images

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look this:

Option A:

public static Bitmap getBitmap(String url) {
    Bitmap bm = null;
    try {
        URL aURL = new URL(url);
        URLConnection conn = aURL.openConnection();
        conn.connect();
        InputStream is = conn.getInputStream();
        BufferedInputStream bis = new BufferedInputStream(is);
        bm = BitmapFactory.decodeStream(new FlushedInputStream(is));
        bis.close();
        is.close();
    } catch (Exception e) {
        e.printStackTrace();
    } 
    return bm;
}

Option B:

public 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);
        input.close();
        return myBitmap;
    } catch (IOException e) {
        e.printStackTrace();
        return null;
    }
}

Jus run the method in a background thread.