.kotlin：
val myStrings = arrayOf("One","Two","Three","Four")
mySpinner.adapter = ArrayAdapter(this,android.R.layout.simple_spinner_dropdown_item,myStrings)
mySpinner.onItemSelectedListener = object :
AdapterView.OnItemSelectedListener {
override fun onNothingSelected(parent: AdapterView<*>?) {
TODO("not implemented")
//To change body of created functions use File | Settings | File Templates.
}
override fun onItemSelected(parent: AdapterView<*>?,view: View?,position: Int,id: Long) {
TODO("not implemented")
//To change body of created functions use File | Settings | File Templates.
}
}}
与Edittext中的“提示”选项相同,我需要Spinner中的默认文本.
最佳答案
没有任何默认方式在微调器中显示提示.
为此,您需要在数组中手动添加一个项目,如下所示.
为此,您需要在数组中手动添加一个项目,如下所示.
val myStrings = arrayOf("Select","One","Four")
现在,
为Spinner定义自定义适配器并禁用第一项,如下所示.
@Override
public boolean isEnabled(int position) {
if (position == 0) {
// Disable the first item from Spinner
// First item will be use for hint
return false;
} else {
return true;
}
}
您可以更改颜色,如下所示
@Override
public View getDropDownView(int position,View convertView,ViewGroup parent) {
View view = super.getDropDownView(position,convertView,parent);
TextView tv = (TextView) view;
if (position == 0) {
// Set the hint text color gray
tv.setTextColor(Color.GRAY);
} else {
tv.setTextColor(Color.BLACK);
}
return view;
}
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