Android 从存储在 JSONObject 中的 URL 获取图像

Question

我想从 json 数组中的 url 获取两个图像 我在异步任务中使用 JSONParser 来获取 JSON 数据(url 字符串) 如何现在加载图像以及在哪里加载图像，我想在中显示图像另一个 fragment 。我声明 2 个 Drawables Globallly 从另一个 Fragment Activity 访问。

MainActivity.java

@Override
protected JSONObject doInBackground(String... args) {
    JSONParser jParser = new JSONParser();

    // Getting JSON from URL
    JSONObject json = jParser.getJSONFromUrl(url);
    return json;
}
 @Override
 protected void onPostExecute(JSONObject json) {
    try {                
            String Student1Image = json.getString("url1");
            String Student2Image = json.getString("url1");

            } catch (JSONException e) {
        e.printStackTrace();
    }
 }

现在在哪里以及如何加载要在另一个 fragment 中显示的图像

MainScreen.java(另一个 fragment )

public class MainScreen extends Fragment {

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    View rootView = inflater.inflate(R.layout.main, container, false);
    new MainActivity();

    ImageView Image = (ImageView) rootView.findViewById(R.id.imgMainWeather);               
    Image.setImageDrawable(**What to Give Here**);

    return rootView;
    }

Answer 1

试试这个:

private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
    ImageView bmImage;

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

    protected Bitmap doInBackground(String... urls) {
        String urldisplay = urls[0];
        Bitmap mIcon11 = null;
        try {
            InputStream in = new java.net.URL(urldisplay).openStream();
            mIcon11 = BitmapFactory.decodeStream(in);
        } catch (Exception e) {
            Log.e("Error", e.getMessage());
            e.printStackTrace();
        }
        return mIcon11;
    }

    protected void onPostExecute(Bitmap result) {
        bmImage.setImageBitmap(result);
    }
}