Question

我已将我的数据添加到array.xml文件中并链接到

 <string-array name="state">
        <item>ANDAMAN NICOBAR ISLANDS</item>
        <item>ANDHRA PRADESH</item>
        <item>ARUNACHAL PRADESH</item>

  <Spinner
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/drpstate"
        android:entries="@array/state"/>

我想动态更改此条目

提前感谢..

Answer 1

使用adapter.add（）添加数据，然后调用adapter.notifyDataSetChanged（）以应用更改。

    Spinner spinner = (Spinner)findViewById(R.id.mySpinner);
    List<String> list = Arrays.asList(getResources().getStringArray(R.array.state));

    ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, list);
    spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinner.setAdapter(spinnerAdapter);
    spinnerAdapter.add("DELHI");
    spinnerAdapter.notifyDataSetChanged();

Answer 2

您可以在Java代码中实现此目的，如下所示：

  List<String> categories = new ArrayList<String>();
  categories.add("Automobile");
  categories.add("Business Services");
  categories.add("Computers");
  categories.add("Education");
  categories.add("Personal");
  categories.add("Travel");

  ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, categories);

  spinner.setAdapter(dataAdapter);

来源：http://www.tutorialspoint.com/android/android_spinner_control.htm

Answer 3

您可以使用BaseAdapter的任何子类来执行此操作。假设您要从数据库加载数据，请使用SimpleCursorAdapter。

    String[] from = new String[]{"nameOfColumn"}; //nameOfColumn is the name of the column in cursor to display in the spinner. 
    int[] to = new int[]{android.R.id.text1};

    SimpleCursorAdapter cursorAdapter = new SimpleCursorAdapter (this, android.R.layout.simple_spinner_item, null, from, to, 0);
    cursorAdapter.setDropDownViewResource (android.R.layout.simple_spinner_dropdown_item);
    binding.paymentChannelSpinner.setAdapter (cursorAdapter);
    binding.paymentChannelSpinner.setOnItemSelectedListener (new AdapterView.OnItemSelectedListener () {
        @Override
        public void onItemSelected (AdapterView<?> adapterView, View view, int i, long l) {
            if (i != -1) {
                Cursor c = (Cursor) adapterView.getItemAtPosition (i);

            }
        }

        @Override
        public void onNothingSelected (AdapterView<?> adapterView) {

        }
    });

将数据作为游标从数据库中获取后，您将光标设置为适配器，如下所示：

   cursorAdapter.changeCursor(cursorFromDB);

但是，如果数据在java数组中，您可以使用Arrayadapter

如何在Android中动态更新Spinner中的数据？

3 个答案: