Question

我正在尝试将一些消息（我从API调用中获取）加载到ListView上。消息在AsyncTask中加载和检索，但我发布的是来自doInBackground（）方法。每当我测试应用程序时，ListView都是空的......我该如何解决这个问题？

for(int x = 0; x < array.length; x++){
            String user = "User: " + array[x].getName();
            String subject = " Subject: " + array[x].getSubject();
            String body = " Body: " + array[x].getBody();

            String message = user + subject + body;

            aList.add(message);
        }


        //for (int i = 0; i < mess.length; ++i) {
              //aList.add(mess[i]);
            //}

        mess = aList.toArray(new String[aList.size()]);


        return true;
    }

    protected void onPostExecute(Boolean results){

        Adapter adapter = new Adapter(ctx,mess);
        listview.setAdapter(adapter);
    }
}

private class Adapter extends ArrayAdapter<String>{

    private final Context context;
      private final String[] values;

      public Adapter(Context context, String[] values) {
        super(context, R.layout.messages, values);
        this.context = context;
        this.values = values;
      }
      public View getView(int position, View convertView, ViewGroup parent) {
            LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            View rowView = inflater.inflate(R.layout.messages, parent, false);

            return rowView;
}
}

Answer 1

在getView（）方法中，您没有将值设置为任何值。假设您在R.layout.messages布局中定义了textview，那么您需要检索它并设置文本。

这样的事情：

View rowView = inflater.inflate(R.layout.messages, parent, false);
TextView txtView = rowView.findViewById(R.id.mytextview);
txtView.setText(values[position]);

消息没有加载到ListView？

1 个答案: