请帮帮我 我正在为我的arraylist中的每个项目从JSON API获取图像到我的Android应用程序。图像正确获取，但不是仅设置每个列表项所针对的图像，而是分别循环并交换一个项目和所有列表项目中所有列表中的所有图像，从而在每个列表中生成图像要在几秒钟内更改为不同图像的项目。
请参阅JSON文件
{ "data":[
{
"sno":1,
"id":"3",
"title":"This Is Great Again",
"desc":"The details of how a UUID is generated are determined by the device manufacturer and are specific to the device's platform or model.The details of...",
"free":"Yes",
"image":"http:\/\/app-web.moneyacademy.ng\/uploads\/145277f3d0499ee8e0dafbac384ca9b4.jpg",
"date_added":"2017-10-12 10:26PM",
"no_comment":3,
"comments":[ ]
},
{
"sno":2,
"id":"6",
"title":"Money Makes The World Go Round",
"desc":"On this realm, nothing works without money. You need to get some of it or else you'll be grounded.",
"free":"Yes",
"image":"http:\/\/app-web.moneyacademy.ng\/uploads\/546a4c29a94f3d70ae9a075ce8afcc6b.jpg",
"date_added":"2018-02-18 10:06AM",
"no_comment":0,
"comments":[ ]
},
{
"sno":3,
"id":"7",
"title":"No One Is Destined To Be Poor",
"desc":"You will not be poor.",
"free":"Yes",
"image":"http:\/\/app-web.moneyacademy.ng\/uploads\/8f19b9cebd1ca4dec74fafcfe23ae0f0.jpg",
"date_added":"2018-02-18 01:03PM",
"no_comment":0,
"comments":[ ]
},
{
"sno":4,
"id":"8",
"title":"What Is Your Money?",
"desc":"Understand the true definition of your money.",
"free":"Yes",
"image":"http:\/\/app-web.moneyacademy.ng\/uploads\/49b35ffb5cabcb7e01dab2d452ec6025.jpg",
"date_added":"2018-02-18 01:30PM",
"no_comment":0,
"comments":[ ]
},
这是我获取每个项目和图像的代码
private static ArrayList<nauget> extractFeatureFromJson(String freeNaugetJson) {
// If the JSON string is empty or null, then return early.
if (TextUtils.isEmpty(freeNaugetJson)) {
return null;
}
ArrayList<nauget> naugets = new ArrayList<nauget>();
try {
JSONObject baseJsonResponse = new JSONObject(freeNaugetJson);
JSONArray dataArray = baseJsonResponse.getJSONArray("data");
// If there are results in the data array
for (int i = 0; i < dataArray.length(); i++){
String title = dataArray.getJSONObject(i).getString("title");
String body = dataArray.getJSONObject(i).getString("desc");
String totalComments = dataArray.getJSONObject(i).getString("no_comment");
String image = dataArray.getJSONObject(i).getString("image");
int id = dataArray.getJSONObject(i).getInt("id");
ArrayList<Comment> comments = new ArrayList<Comment>();
//fetch each comment detail
if (Integer.parseInt(totalComments) > 0) {
JSONArray commentArray = dataArray.getJSONObject(i).getJSONArray("comments");
for (int j = 0; j < commentArray.length(); j++) {
String userName = commentArray.getJSONObject(j).getString("userName");
String comment_image = commentArray.getJSONObject(j).getString("userPhoto");
String comment = commentArray.getJSONObject(j).getString("comment");
String date = commentArray.getJSONObject(j).getString("date_commented");
comments.add(new Comment(userName, comment_image, comment, date));
}
}
// Create a new nauget object
naugets.add(new nauget(title, body, image, totalComments, comments, id));
}
} catch (JSONException e) {
Log.e(LOG_TAG, "Problem parsing the nauget JSON results", e);
}
return naugets;
}
这是我的自定义适配器代码，其中为每个列表项设置图像及其文本数据。
public class NaugetAddapter extends ArrayAdapter<nauget> {
ArrayList<nauget> naugets;
private nauget currentNauget;
private ImageView naugetImage;
private TextView naugetTitle;
private TextView naugetBody;
private TextView commentCount;
public NaugetAddapter(@NonNull Context context, ArrayList<nauget> naugets) {
super(context, 0, naugets);
}
@NonNull
@Override
public View getView(final int position, @Nullable View convertView, @NonNull ViewGroup parent) {
//check if the convert view is null and inflate the view
if (convertView == null){
convertView = LayoutInflater.from(getContext()).inflate(R.layout.free_nauget_item, parent, false);
}
currentNauget = (nauget) getItem(position);
//find the nauget title textView and set the text
naugetTitle = (TextView) convertView.findViewById(R.id.nauget_title);
naugetTitle.setText(currentNauget.getNauget_title());
//find the nauget body textView and set the text
naugetBody = (TextView) convertView.findViewById(R.id.nauget_body);
naugetBody.setText(currentNauget.getNauget_body());
//set the nauget total comment count
commentCount = (TextView) convertView.findViewById(R.id.comment_count);
commentCount.setText(currentNauget.getNaugetTotalComments());
//set the comment text
TextView commentText = (TextView) convertView.findViewById(R.id.comment_text);
commentText.setText(currentNauget.getNaugetCommentText());
//set the nauget image
naugetImage = (ImageView) convertView.findViewById(R.id.nauget_image);
new DownloadImageTask().execute(currentNauget.getImageUrl());
//set the share icon
ImageView shareIcon = (ImageView) convertView.findViewById(R.id.share_icon);
shareIcon.setImageResource(currentNauget.getNaugetShareIcon());
//set share functionality on the share icon
shareIcon.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent shareIntent = new Intent(Intent.ACTION_SEND);
shareIntent.setType("text/plain");
shareIntent.putExtra(Intent.EXTRA_SUBJECT, "My App");
shareIntent.putExtra(Intent.EXTRA_TEXT,
naugetTitle.getText()
+ "\n" + naugetBody.getText()
+ "\n" + naugetImage.getDrawable());
startActivity(getContext(), Intent.createChooser(shareIntent, "Share via"), null);
}
});
return convertView;
}
private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// mLoadingIndicator.setVisibility(View.VISIBLE);
}
protected Bitmap doInBackground(String... urls) {
Bitmap image = null;
HttpURLConnection urlConnection = null;
try {URL url = new URL(urls[0]);
urlConnection = (HttpURLConnection) url.openConnection();
int statusCode = urlConnection.getResponseCode();
if (statusCode != 200) {
return null;
}
InputStream inputStream = urlConnection.getInputStream();
if (inputStream != null) {
Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
return bitmap;
}
} catch (Exception e) {
urlConnection.disconnect();
Log.e("Error", e.getMessage());
e.printStackTrace();
}finally {
if (urlConnection != null) {
urlConnection.disconnect();
}
}
return null;
}
protected void onPostExecute(Bitmap result) {
// mLoadingIndicator.setVisibility(View.INVISIBLE);
naugetImage.setImageBitmap(result);
}
}
@NonNull
@Override
public Filter getFilter() {
return new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
ArrayList<nauget> filteredResults = new ArrayList<>();
FilterResults results = new FilterResults();
results.values = filteredResults;
return results;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
}
};
}
void setFilter(ArrayList<nauget> listItem){
naugets = new ArrayList();
naugets.addAll(listItem);
notifyDataSetChanged();
}
}
答案 0 :(得分：0)
这应该可以解决问题！你正在尝试一切正常，但你有一个循环中的注释ArrayList每次实例化刚刚把它放在外部循环之前，就像我在这里做的那样，错误应该去了！ 尝试
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