Android 如何禁用微调器中的项目
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How to disable an item in a Spinner
提问by FrinkTheBrave
Is it possible to display particular entries in a Spinner list as disabled?
是否可以将 Spinner 列表中的特定条目显示为禁用状态？
I.e., I want to always display a spinner with four entries (North, South, East, and West, say), but I want to be able to disable any one of these so that is appears greyed out and not selectable.
即，我希望始终显示一个带有四个条目（例如北、南、东和西）的微调器，但我希望能够禁用其中任何一个，以便显示为灰色且不可选择。
Is this possible, or will I have to recreate the list each time, leaving out the invalid entries?
这是可能的，还是我每次都必须重新创建列表，而忽略无效条目？
回答by Luan Dang
// Create spinner month, and disable month < today
List<CharSequence> listMonth = new ArrayList<CharSequence>();
for (int m = 0; m < 12; m++) {
if (m < 9) {
listMonth.add("0" + (m + 1));
} else {
listMonth.add("" + (m + 1));
}
}
// Create spinner item
adapterMonth = new ArrayAdapter<CharSequence>(this,
R.layout.layout_spinner_item, listMonth) {
// Disable click item < month current
@Override
public boolean isEnabled(int position) {
// TODO Auto-generated method stub
if (year <= max_year && position < max_month - 1) {
return false;
}
return true;
}
// Change color item
@Override
public View getDropDownView(int position, View convertView,
ViewGroup parent) {
// TODO Auto-generated method stub
View mView = super.getDropDownView(position, convertView, parent);
TextView mTextView = (TextView) mView;
if (year <= max_year && position < max_month - 1) {
mTextView.setTextColor(Color.GRAY);
} else {
mTextView.setTextColor(Color.BLACK);
}
return mView;
}
};
adapterMonth
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spn2.setAdapter(adapterMonth);
回答by T. Aslam
public class MySpinnerAdapter extends BaseAdapter {
@Override
public void isEnabled(int position) {
return getItem(position).isEnabled();
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if(convertView == null) {
convertView = View.inflate(parent.getContext(), R.layout.item, null);
}
if(!isEnabled(position)) {
convertView.setEnabled(false);
convertView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//NO-OP: Just intercept click on disabled item
}
});
}
return convertView;
}
}
回答by Haphazard
回答by CommonsWare
Is this possible
这可能吗
It doesn't appear so. The way you would do that with ListViewinvolves areAllItemsEnabled()and isEnabled(). However, those are methods on the ListAdapterinterface, not the SpinnerAdapterinterface. So, I suspect they will be ignored by a Spinner.
看起来不是这样。你会做与方式ListView包括areAllItemsEnabled()和isEnabled()。但是，这些是ListAdapter接口上的方法，而不是SpinnerAdapter接口。所以，我怀疑它们会被Spinner.
回答by Levon Petrosyan
class SpinnerAdapter(context: Context, resource: Int, list: ArrayList<String>)
: ArrayAdapter<String>(context, resource, list) {
override fun isEnabled(position: Int): Boolean {
// select position to disable
return position != 0
}
}
