1

嗨，我正在尝试将图像从 URL 添加到 ImageView，我尝试将其加载为位图，但没有显示任何内容。那么有谁知道最好的方法是什么或者我做错了什么？

这是我的代码

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    //Check Preferences which sets UI
    setContentView(R.layout.singlenews);
      TextView headerText = (TextView) findViewById(R.id.header_text);
       headerText.setText("Latest News");


     PostTask posttask;
       posttask = new PostTask();
       posttask.execute();
}

public void loadNews(){

    newsStr = getIntent().getStringExtra("singleNews");




    try {
        JSONObject obj = new JSONObject(newsStr);
        content = obj.getString("content");
          title = obj.getString("title");
          fullName = obj.getString("fullname");
          created = obj.getString("created");
        NewsImageURL = obj.getString("image_primary");
        tagline = obj.getString("tagline");

        meta = "posted by: " + fullName + " " + created;


        URL aURL = new URL("NewsImageURL");
        URLConnection conn = aURL.openConnection();
        conn.connect();
        InputStream is = conn.getInputStream();
        /* Buffered is always good for a performance plus. */
        BufferedInputStream bis = new BufferedInputStream(is);
        /* Decode url-data to a bitmap. */
         bm = BitmapFactory.decodeStream(bis);
        bis.close();
        is.close();
        /* Apply the Bitmap to the ImageView that will be returned. */






        Log.v("lc", "content=" + content);
        Log.v("lc", "title=" + title);
        Log.v("lc", "fullname=" + fullName);
        Log.v("lc", "created=" + created);
        Log.v("lc", "NewsImage=" + NewsImageURL);
        Log.v("lc", "Meta=" + meta);
        Log.v("lc", "tagline=" + tagline);







} catch 
 (JSONException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
} catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

}




public class PostTask extends AsyncTask<Void, String, Boolean> {

    @Override
    protected Boolean doInBackground(Void... params) {
        boolean result = false;
        loadNews();
        publishProgress("progress");
        return result;
    }

    protected void onProgressUpdate(String... progress) {
        StringBuilder str = new StringBuilder();
            for (int i = 1; i < progress.length; i++) {
                str.append(progress[i] + " ");

            }
    }

        @Override
    protected void onPostExecute(Boolean result) {
        super.onPostExecute(result);
        Log.v("BGThread", "begin fillin data");

        fillData();

        }
}

public void fillData(){

    NewsView = LayoutInflater.from(getBaseContext()).inflate(R.layout.newsdetailact,
            null);

  TextView Title = (TextView) NewsView.findViewById(R.id.NewsTitle);
  Title.setText(title);

  TextView Tagline = (TextView) NewsView.findViewById(R.id.subtitle);
  Tagline.setText(tagline);

  TextView MetaData = (TextView) NewsView.findViewById(R.id.meta);
  MetaData.setText(meta);




     ImageView NewsImage = (ImageView)NewsView.findViewById(R.id.imageView2);
     NewsImage.setImageBitmap(bm);

  TextView MainContent = (TextView) NewsView.findViewById(R.id.maintext);
  MainContent.setText(content);





  Log.v("BGThread", "Filled results");

adapter = new MergeAdapter();

adapter.addView(NewsView);


setListAdapter(adapter);


}



}
4

4 回答 4

3

请使用此代码尖晶石将 url 图像转换为位图并在图像视图中显示。

URL url = new URL("http://image10.bizrate-images.com/resize?sq=60&uid=2216744464");
Bitmap bmp = BitmapFactory.decodeStream(url.openConnection().getInputStream());
imageView.setImageBitmap(bmp);

T认为它对你有帮助。

谢谢

于 2012-06-15T15:01:40.763 回答
0

我使用Prime进行所有图像加载，可以轻松处理此类情况。

于 2012-06-15T15:03:24.807 回答
0 
          String url1 = "Your URL....";

                    URL ulrn = new URL(url1);
                    HttpURLConnection con = (HttpURLConnection) ulrn
                            .openConnection();
                    InputStream is = con.getInputStream();
                    bmp1 = BitmapFactory.decodeStream(is);

                    int widthPx = 150;  //you can set width
                    int heightPx = 150; //you can set height
                    bmp1=Bitmap.createScaledBitmap(bmp1, widthPx, heightPx, true); 

         Imgview1.setImageBitmap(bmp1);
于 2012-06-15T15:13:30.287 回答
0

在这种情况下，我会尝试先将 InputStream 写入文件，然后从文件中加载。这通常有效。证明写入文件的另一个原因是因为我更喜欢从互联网上延迟加载图像，因为它可能需要比预期更长的时间。在这种情况下，我怀疑 InputStream 在有机会完成该过程之前已关闭。

您的代码和我的代码结构几乎相同，没有复制到文件部分。

如果你想调查，我建议你这样做：

  1. 检查图像是否确实存在。
  2. 检查并比较 Stream 和 Bitmap 的大小。
  3. 检查 InpuStream 以查看它是否意外关闭。
于 2012-06-15T15:17:37.423 回答