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
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
}
其他回答
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
你也可以用这个,
String[] baths = getResources().getStringArray(R.array.array_baths);
mSpnBaths.setSelection(Arrays.asList(baths).indexOf(value_here));
使用下面的行来选择使用值:
mSpinner.setSelection(yourList.indexOf("value"));
以下是我的完整解决方案。我有以下enum:
public enum HTTPMethod {GET, HEAD}
用于后续课程
public class WebAddressRecord {
...
public HTTPMethod AccessMethod = HTTPMethod.HEAD;
...
使用HTTPMethod enum-member设置微调器的代码:
Spinner mySpinner = (Spinner) findViewById(R.id.spinnerHttpmethod);
ArrayAdapter<HTTPMethod> adapter = new ArrayAdapter<HTTPMethod>(this, android.R.layout.simple_spinner_item, HTTPMethod.values());
mySpinner.setAdapter(adapter);
int selectionPosition= adapter.getPosition(webAddressRecord.AccessMethod);
mySpinner.setSelection(selectionPosition);
其中R.id.spinnerHttpmethod定义在布局文件中,而android.R.layout. httpmethod定义在布局文件中。Simple_spinner_item由android-studio下发。
如果你需要在任何旧的适配器上有一个indexOf方法(并且你不知道底层实现),那么你可以使用这个:
private int indexOf(final Adapter adapter, Object value)
{
for (int index = 0, count = adapter.getCount(); index < count; ++index)
{
if (adapter.getItem(index).equals(value))
{
return index;
}
}
return -1;
}