在android系统加载位图的ImageView从网址 [英] Loading Bitmap to ImageView from URL in android

问题描述

我使用下面的方法来从URL检索位图，并把它传递到ImageView的，但ImageView的不被更新。

 公共静态位图LoadImageFromWebOperations（字符串URL）{
    位图位图;
    尝试{
        InputStream的是=新的URL（网址）.openStream（）;
       位= BitmapFactory.de codeStream（是）;
        返回位图;
    }赶上（例外五）{
         返回null;
    }
 

通话 -

  mov1_poster.setImageBitmap（VPmovies.LoadImageFromWebOperations（mov_details [0] [7]））;
//不起作用  Toast.makeText（这一点，网址为\\ n+ mov_details [0] [7]，Toast.LENGTH_LONG）.show（）;
   //显示图像的URL成功（只是​​查询的网址不为null）
 

有什么我做错了什么？请帮助。

解决方案

 公共类DownloadImageTask扩展的AsyncTask＆LT;弦乐，太虚，位图＆GT; {
    私人ImageView的ImageView的;
    私人位图图像;    公共DownloadImageTask（ImageView的ImageView的）{
        this.imageView = ImageView的;
    }    保护位图doInBackground（字符串的URL ...）{
        字符串urldisplay =网址[0];
        尝试{
            在的InputStream =新的java.net.URL（urldisplay）.openStream（）;
            图像= BitmapFactory.de codeStream（中）;
        }赶上（例外五）{
            图像= NULL;
        }
        返回形象;
    }    @燮pressLint（NewApi）
    保护无效onPostExecute（位图结果）{
        如果（结果！= NULL）{
            imageView.setImageBitmap（结果）;
        }
    }
}
 

现在，在您code拨打：

 新DownloadImageTask（YOUR_IMAGE_VIEW）.execute（YOUR_URL）;
 

I am using following method to retrieve a bitmap from the url and pass it on to the imageview , but the imageview is not being updated.

 public static Bitmap LoadImageFromWebOperations(String url) {
    Bitmap bitmap;
    try {
        InputStream is = new URL(url).openStream();
       bitmap = BitmapFactory.decodeStream(is);
        return bitmap;
    } catch (Exception e) {
         return null;
    }

call -

  mov1_poster.setImageBitmap(VPmovies.LoadImageFromWebOperations(mov_details[0][7]));
//doesn't work

  Toast.makeText(this,"url is \n"+mov_details[0][7],Toast.LENGTH_LONG).show();
   // shows the url of the image successfully (just to check the url is not null)

Is there anything i am doing wrong ? Please help.

解决方案

public class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
    private ImageView imageView;
    private Bitmap image;

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

    protected Bitmap doInBackground(String... urls) {
        String urldisplay = urls[0];
        try {
            InputStream in = new java.net.URL(urldisplay).openStream();
            image = BitmapFactory.decodeStream(in);
        } catch (Exception e) {
            image = null;
        }
        return image;
    }

    @SuppressLint("NewApi")
    protected void onPostExecute(Bitmap result) {
        if (result != null) {
            imageView.setImageBitmap(result);
        }
    }
}

Now call in your code:

 new DownloadImageTask(YOUR_IMAGE_VIEW).execute("YOUR_URL");

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