我有一个更新视图,在那里我需要预先选择存储在数据库中的值为一个微调器。
我有这样的想法,但适配器没有indexOf方法,所以我被卡住了。
void setSpinner(String value)
{
int pos = getSpinnerField().getAdapter().indexOf(value);
getSpinnerField().setSelection(pos);
}
我有一个更新视图,在那里我需要预先选择存储在数据库中的值为一个微调器。
我有这样的想法,但适配器没有indexOf方法,所以我被卡住了。
void setSpinner(String value)
{
int pos = getSpinnerField().getAdapter().indexOf(value);
getSpinnerField().setSelection(pos);
}
当前回答
根据Merrill的回答 下面是如何使用CursorAdapter
CursorAdapter myAdapter = (CursorAdapter) spinner_listino.getAdapter(); //cast
for(int i = 0; i < myAdapter.getCount(); i++)
{
if (myAdapter.getItemId(i) == ordine.getListino() )
{
this.spinner_listino.setSelection(i);
break;
}
}
其他回答
我在Spinners中保留了一个单独的数组列表。这样我就可以在数组列表上执行indexOf,然后使用该值在Spinner中设置选择。
I had the same issue when trying to select the correct item in a spinner populated using a cursorLoader. I retrieved the id of the item I wanted to select first from table 1 and then used a CursorLoader to populate the spinner. In the onLoadFinished I cycled through the cursor populating the spinner's adapter until I found the item that matched the id I already had. Then assigned the row number of the cursor to the spinner's selected position. It would be nice to have a similar function to pass in the id of the value you wish to select in the spinner when populating details on a form containing saved spinner results.
@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) {
adapter.swapCursor(cursor);
cursor.moveToFirst();
int row_count = 0;
int spinner_row = 0;
while (spinner_row < 0 || row_count < cursor.getCount()){ // loop until end of cursor or the
// ID is found
int cursorItemID = bCursor.getInt(cursor.getColumnIndexOrThrow(someTable.COLUMN_ID));
if (knownID==cursorItemID){
spinner_row = row_count; //set the spinner row value to the same value as the cursor row
}
cursor.moveToNext();
row_count++;
}
}
spinner.setSelection(spinner_row ); //set the selected item in the spinner
}
非常简单,只需使用getSelectedItem();
eg :
ArrayAdapter<CharSequence> type=ArrayAdapter.createFromResource(this,R.array.admin_typee,android.R.layout.simple_spinner_dropdown_item);
type.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
mainType.setAdapter(type);
String group=mainType.getSelectedItem().toString();
上述方法返回一个字符串值
在上面的R.array。Admin_type是值中的字符串资源文件
只需在值>>字符串中创建一个.xml文件
YourAdapter yourAdapter =
new YourAdapter (getActivity(),
R.layout.list_view_item,arrData);
yourAdapter .setDropDownViewResource(R.layout.list_view_item);
mySpinner.setAdapter(yourAdapter );
String strCompare = "Indonesia";
for (int i = 0; i < arrData.length ; i++){
if(arrData[i].getCode().equalsIgnoreCase(strCompare)){
int spinnerPosition = yourAdapter.getPosition(arrData[i]);
mySpinner.setSelection(spinnerPosition);
}
}
假设你的Spinner名为mSpinner,它包含一个选项:"some value"。
要查找并比较“some value”在Spinner中的位置,请使用以下命令:
String compareValue = "some value";
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.select_state, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
mSpinner.setAdapter(adapter);
if (compareValue != null) {
int spinnerPosition = adapter.getPosition(compareValue);
mSpinner.setSelection(spinnerPosition);
}