Android image view from url

问题:

I am downloading an image from url, but the image is not changed after the download is complete. I am entering code below, anybody experienced the same?

Java file

public class MyImgActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    ImageView imgView =(ImageView)findViewById(R.id.imageView1);
    Drawable drawable = LoadImageFromWebOperations("http://www.gophoto.it/view.php?i=http://1.bp.blogspot.com/-2LTvCCufBKc/T3L3KgcTj2I/AAAAAAAABbQ/Ki60e1LU9sE/s1600/Sachin%2BTendulkar.png");

    imgView.setImageDrawable(drawable);
 }
private Drawable LoadImageFromWebOperations(String url) {
    try
      {
       InputStream is = (InputStream) new URL(url).getContent();
       Drawable d = Drawable.createFromStream(is, "src name");
       return d;
      }catch (Exception e) {
       System.out.println("Exc="+e);
       return null;
      }
}
}

XML file

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<ImageView 
    android:id="@+id/imageView1"
    android:layout_height="match_parent" 
    android:layout_width="match_parent"></ImageView>
</LinearLayout>

Manifest file

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

回答1:

Please Use below code for download and display image into imageview.

public class image extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Bitmap bitmap = DownloadImage("http://www.gophoto.it/view.php?i=http://1.bp.blogspot.com/-2LTvCCufBKc/T3L3KgcTj2I/AAAAAAAABbQ/Ki60e1LU9sE/s1600/Sachin%2BTendulkar.png");
        ImageView img = (ImageView) findViewById(R.id.img);
        img.setImageBitmap(bitmap);
    }

    private InputStream OpenHttpConnection(String urlString) throws IOException {
        InputStream in = null;
        int response = -1;

        URL url = new URL(urlString);
        URLConnection conn = url.openConnection();

        if (!(conn instanceof HttpURLConnection))
            throw new IOException("Not an HTTP connection");

        try {
            HttpURLConnection httpConn = (HttpURLConnection) conn;
            httpConn.setAllowUserInteraction(false);
            httpConn.setInstanceFollowRedirects(true);
            httpConn.setRequestMethod("GET");
            httpConn.connect();
            response = httpConn.getResponseCode();
            if (response == HttpURLConnection.HTTP_OK) {
                in = httpConn.getInputStream();
            }
        } catch (Exception ex) {
            throw new IOException("Error connecting");
        }
        return in;
    }

    private Bitmap DownloadImage(String URL) {
        Bitmap bitmap = null;
        InputStream in = null;
        try {
            in = OpenHttpConnection(URL);
            bitmap = BitmapFactory.decodeStream(in);
            in.close();
        } catch (IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
        return bitmap;
    }
}

回答2:

Following code working with the following url but its not working with your url.the problem is with your image size.Try with another url it will work.

public class MyImgActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        ImageView imgView =(ImageView)findViewById(R.id.imageView1);
        URL url = null;
        Bitmap bmp = null;
        try {
            url = new URL("http://www.seobook.com/images/smallfish.jpg");
            bmp = BitmapFactory.decodeStream(url.openConnection().getInputStream());
        } catch (MalformedURLException e) {

        }catch (IOException e) {

        }
       imgView.setImageBitmap(bmp); 
      }

    }

回答3:

 try
  {

   URL murl = new URL(url)
  URLConnection ucon = murl.openConnection();
  InputStream is = ucon.getInputStream();
   Drawable d = Drawable.createFromStream(is, "src name");
   return d;
  }catch (Exception e) {
   System.out.println("Exc="+e);
   return null;
  }

use this cose inside your download method and if the connection speed is slow use thread to donwload and hanlder to post the image...as explained by @Hiren

回答4:

try below code,

just change your URL to,

URL

onCreate

new Thread(new Runnable() {

        @Override
        public void run() {
            // TODO Auto-generated method stub
            drawable = LoadImageFromWebOperations("http://1.bp.blogspot.com/-2LTvCCufBKc/T3L3KgcTj2I/AAAAAAAABbQ/Ki60e1LU9sE/s1600/Sachin%2BTendulkar.png");
            handler.sendEmptyMessage(0);
        }
    }).start();

set image after downloading image using handler

Handler handler = new Handler(){
    @Override
    public void handleMessage(android.os.Message msg) {
        imgView.setImageDrawable(drawable);
        Log.i("System out","after set the image...");
    }
};

Hope help you...