How to get Images from Internet and past it in a ListView?

问题

I'm doing my BlogApp. It gets all data from the Internet. I added three TextViews, but I have problem with getting images from JSON. I've tryed different ways but I still don't understand how exactly do this. Here is a part of my code:

 private void handleBlogResponse() {
    mProgressBar.setVisibility(View.INVISIBLE);

    if (mBlogData==null){
        updateDisplayForError();

    }else {
        try {
            JSONArray jsonPosts = mBlogData.getJSONArray("posts");
            ArrayList<HashMap<String, String>> blogPosts = new ArrayList<HashMap<String, String>>();
            for (int i=0; i<jsonPosts.length(); i++){
                JSONObject posts = jsonPosts.getJSONObject(i);
                String title = posts.getString(KEY_TITLE); //"title"
                title = Html.fromHtml(title).toString();
                String author = posts.getString(KEY_AUTHOR); //"author"
                author = Html.fromHtml(author).toString();
                String time = posts.getString((KEY_TIME));  //"time"
                time = Html.fromHtml(time).toString();
                String icon = posts.getString(KEY_ICON);  //"icon" (icons url)
                icon = Html.fromHtml(icon).toString();

I stoped here, and don't know what to do next! Probably I should add an Adapter for my Images to convert it?

                HashMap<String, String> blogPost = new HashMap<String, String>();
                blogPost.put(KEY_TITLE, title);
                blogPost.put(KEY_AUTHOR, author);
                blogPost.put(KEY_TIME, time);

                blogPosts.add(blogPost);
            }

            String[] keys = {KEY_TITLE, KEY_AUTHOR, KEY_TIME};
            int[] ids = {R.id.textView1, R.id.textView2, R.id.textView3};
            SimpleAdapter adapter = new SimpleAdapter(this, blogPosts, R.layout.row_layout,
                    keys, ids);
            setListAdapter(adapter);

        } catch (JSONException e) {
            Log.e(TAG, "Exception caught" + e);
        }
    }
}

Thanks for waching this!

回答1:

Volley Library makes this work quite easy and handles all other related tasks itself. You can use ImageLoader or NetworkImageView.
Follow the link for how to acheive it: https://developer.android.com/training/volley/request.html

回答2:

First of all download image from url then set it into your imageView.

public class LoadImageFromURL extends AsyncTask{  
@Override  
protected Bitmap doInBackground(String... params) {  

try {
URL url = new URL("image-url");  
InputStream is = url.openConnection().getInputStream();  
Bitmap bitMap = BitmapFactory.decodeStream(is);  
return bitMap;  

} catch (MalformedURLException e) {

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

}
@Override  
protected void onPostExecute(Bitmap result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
yourImageview.setImageBitmap(result);
}

}

I Hope it will help you..!

来源：https://stackoverflow.com/questions/30453679/how-to-get-images-from-internet-and-past-it-in-a-listview

标签

android

json

android-listview

android-arrayadapter

listadapter