如何在微调器中添加提示 [英] How to add a Hint in spinner
本文介绍了如何在微调器中添加提示的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
微调器的XML代码:
<Spinner
android:id="@+id/mySpinner"
https://stackoverflow.com/questions
style="@style/Widget.AppCompat.DropDownItem.Spinner"
android:layout_width="match_parent"
android:layout_height="70dp" />`
.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.
}
}}
等于Edittext中的提示"选项,我需要Spinner中的默认文本.
Equal to the "hint" option in Edittext, I need a default text in a Spinner.
推荐答案
没有任何默认方式可以在微调器中显示提示.为此,您需要在下面的数组中手动添加一项.
There is not any default way to display hint in spinner. For this you need to add one item manually in the array like below.
val myStrings = arrayOf("Select","One", "Two" , "Three", "Four")
现在,为Spinner定义自定义适配器,并禁用以下第一项.
Now, Define custom Adapter for the Spinner and disable the first item like below.
@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;
}
}
您可以如下更改颜色
@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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