Question

数据是从数据库mysql中获取的，并且它没有显示在spiner中，但它显示在下拉列表中，不知道问题出在哪里..

在这里我完整的代码： -

main.java

public class MainActivity extends AppCompatActivity {
    ArrayList<String> listItems = new ArrayList<>();
Spinner spn;
    ArrayAdapter<String> adapter;
    ProgressDialog mProgressDialog;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        spn= (Spinner)findViewById(R.id.selectcmpny);
        adapter = new ArrayAdapter<String>(getApplicationContext(), R.layout.spinner_layout, R.id.txt1,listItems);
        spn.setAdapter(adapter);
        adapter.notifyDataSetChanged();
      //  spn.setSelection(0);
    }
    public void onStart() {
        super.onStart();
        BackTask bt = new BackTask();
        bt.execute();
    }
    //for Spinner
    private class BackTask extends AsyncTask<Void, Void, Void> {
        ArrayList<String> list;
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            list = new ArrayList<>();

        }


        protected Void doInBackground(Void... params) {
            InputStream is = null;
            String result = "";
            try {
                HttpClient httpclient = new DefaultHttpClient();
                HttpPost httppost = new HttpPost("http://www.abcdefg.com/o_cmpany.php");
                HttpResponse response = httpclient.execute(httppost);
                HttpEntity entity = response.getEntity();
                // Get our response as a String.
                is = entity.getContent();
            } catch (IOException e) {
                e.printStackTrace();
            }

            //convert response to string
            try {
                BufferedReader reader = new BufferedReader(new InputStreamReader(is, "utf-8"));
                String line = null;
                while ((line = reader.readLine()) != null) {
                    result += line;
                }
                is.close();
                //result=sb.toString();
            } catch (Exception e) {
                e.printStackTrace();
            }
            // parse json data
            try {
                JSONArray jArray = new JSONArray(result);
                list.add("Please Select Company");
                for (int i = 0; i < jArray.length(); i++) {
                    JSONObject jsonObject = jArray.getJSONObject(i);
                    // add interviewee name to arraylist
                    list.add(jsonObject.getString("name"));
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }
            return null;
        }

        protected void onPostExecute(Void result) {
            listItems.addAll(list);
        }
    }
}

main.xml中

<Spinner

        android:background="#ff0"
        android:spinnerMode="dropdown"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:id="@+id/selectcmpny"
        />

spinner_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >

    <TextView
        android:id="@+id/txt1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="sachin"
        android:background="#87f2f9f7"
        android:textSize="20dp"
        android:textColor="#000"
        android:padding="10dp"
        />
</LinearLayout>

Answer 1

你可以尝试

自定义适配器。 AdapterSpinner.java

public class AdapterSpinner extends ArrayAdapter<String> {

    public AdapterSpinner(@NonNull Context context) {
        super(context, 0);
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        convertView = LayoutInflater.from(getContext()).inflate(R.layout.spinner_layout, null);
        TextView txv = (TextView) convertView.findViewById(R.id.txt1);

        String text = getItem(position);
        txv.setText(text);

        return convertView;
    }

    @Override
    public View getDropDownView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        convertView = LayoutInflater.from(getContext()).inflate(R.layout.spinner_layout, null);
        TextView txv = (TextView) convertView.findViewById(R.id.txt1);

        String text = getItem(position);
        txv.setText(text);

        return convertView;
    }
}

新适配器

adapter = new AdapterSpinner(this);
adapter.addAll(listItems);

来自onPostExecute方法的

protected void onPostExecute(Void result) {
        listItems.addAll(list);
        adapter.clear();
        adapter.addAll(list);
        adapter.notifyDataSetChanged();
    }

祝你好运

数据在微调器中分配，但不在显示器中显示，仅在下拉列表中可见

1 个答案: