Image not showing on image view

问题

I am trying to set image on imageview but image is not show.

I am reading image url from json data and then trying to set it on ImageView but my image is not visible. No any exception occur.
Here is my code

HotelList.class

static final String TAG_DISHIMAGEURL = "dishimageurl";
......
String imageUrl = dishResult.getString(TAG_DISHIMAGEURL);
map.put(TAG_DISHIMAGEURL, imageUrl);
.....
dishimageurl1 = hm.get(TAG_DISHIMAGEURL).toString();
 intent.putExtra("background", dishimageurl1);

HotelDetails.class

......
String dishimageurl = bundle.getString("background");
Bitmap bimage=  getBitmapFromURL(dishimageurl);
    imageView.setImageBitmap(bimage);
....   
public Bitmap getBitmapFromURL(String src) {
try {
    URL url = new URL(src);
    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
    connection.setDoInput(true);
    Toast.makeText(this, "showing image", Toast.LENGTH_LONG).show();
    connection.connect();
    InputStream input = connection.getInputStream();
    Bitmap myBitmap = BitmapFactory.decodeStream(input);
    return myBitmap;
} catch (IOException e) {
    Toast.makeText(this, "showing exception", Toast.LENGTH_LONG).show();
    return null;
}

}

I don't understand what happen with this code. No any exception but my image is not visible.
Please give me any reference.

回答1:

Please Use below code for get image from url and display 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");

        RelativeLayout mRlayout1 = (RelativeLayout) findViewById(R.id.mRlayout1);
        Drawable d=new BitmapDrawable(bitmap);
        mRlayoutLogin.setBackgroundDrawable(d);
    }

    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:

you can view image by using this code.

    try {
    bitmap = BitmapFactory.decodeStream((InputStream)new URL(url).getContent());
} catch (MalformedURLException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
} catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

回答3:

It seems you are downloading the image from UI thread. this will block the UI thread and will give you not responding error. as an easy way, you can use a library like Universal Image Loader

Universal Image Loader - GitHub

this will manage the image loading for you and avoid problems like incorrect urls, Out Of Memory error.

来源：https://stackoverflow.com/questions/14136084/image-not-showing-on-image-view

标签

android

bitmap

imageview