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
你可以使用这种方式,只是让你的代码更简单、更清晰。
ArrayAdapter<String> adapter = (ArrayAdapter<String>) spinnerCountry.getAdapter();
int position = adapter.getPosition(obj.getCountry());
spinnerCountry.setSelection(position);
希望能有所帮助。
其他回答
如果将XML数组设置为XML布局中的旋转器,则可以做到这一点
final Spinner hr = v.findViewById(R.id.chr);
final String[] hrs = getResources().getStringArray(R.array.hours);
if(myvalue!=null){
for (int x = 0;x< hrs.length;x++){
if(myvalue.equals(hrs[x])){
hr.setSelection(x);
}
}
}
因为我需要一些东西,这也适用于本地化,我想出了以下两种方法:
private int getArrayPositionForValue(final int arrayResId, final String value) {
final Resources english = Utils.getLocalizedResources(this, new Locale("en"));
final List<String> arrayValues = Arrays.asList(english.getStringArray(arrayResId));
for (int position = 0; position < arrayValues.size(); position++) {
if (arrayValues.get(position).equalsIgnoreCase(value)) {
return position;
}
}
Log.w(TAG, "getArrayPosition() --> return 0 (fallback); No index found for value = " + value);
return 0;
}
如您所见,我还遇到了arrays.xml和我要比较的值之间的大小写敏感性的额外复杂性。 如果你没有这个,上面的方法可以简化为:
返回arrayValues.indexOf(价值);
静态助手方法
public static Resources getLocalizedResources(Context context, Locale desiredLocale) {
Configuration conf = context.getResources().getConfiguration();
conf = new Configuration(conf);
conf.setLocale(desiredLocale);
Context localizedContext = context.createConfigurationContext(conf);
return localizedContext.getResources();
}
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
}
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;
}
}
使用下面的行来选择使用值:
mSpinner.setSelection(yourList.indexOf("value"));