我有一个替代解决方案，它使用TextInputLayout的行为和自定义DialogFragment（AlertDialog）来模拟微调器对话框弹出窗口。
layout.xml：
<android.support.design.widget.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<EditText
android:id="@+id/your_et"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="@string/your_label"
android:maxLines="1"
android:inputType="textNoSuggestions"
android:textAppearance="@style/TextAppearance.AppCompat.Medium"
android:focusable="false"
style="@style/Base.Widget.AppCompat.Spinner.Underlined"/>
</android.support.design.widget.TextInputLayout>
通过DialogFragment创建自定义微调器（AlertDialog）
SpinnerFragment.java：
public class SpinnerFragment extends DialogFragment {
private static final String TITLEID = "titleId";
private static final String LISTID = "listId";
private static final String EDITTEXTID = "editTextId";
public static SpinnerFragment newInstance(int titleId, int listId, int editTextId) {
Bundle bundle = new Bundle();
bundle.putInt(TITLEID, titleId);
bundle.putInt(LISTID, listId);
bundle.putInt(EDITTEXTID, editTextId);
SpinnerFragment spinnerFragment = new SpinnerFragment();
spinnerFragment.setArguments(bundle);
return spinnerFragment;
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
final int titleId = getArguments().getInt(TITLEID);
final int listId = getArguments().getInt(LISTID);
final int editTextId = getArguments().getInt(EDITTEXTID);
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
try {
final String[] items = getResources().getStringArray(listId);
builder.setTitle(titleId)
.setItems(listId, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int pos) {
EditText et = (EditText) getActivity().findViewById(editTextId);
String selectedText = items[pos];
if (!TextUtils.isEmpty(selectedText)) {
et.setText(selectedText);
} else {
et.getText().clear();
}
}
});
} catch (NullPointerException e) {
Log.e(getClass().toString(), "Failed to select option in " + getActivity().toString() + " as there are no references for passed in resource Ids in Bundle", e);
Toast.makeText(getActivity(), getString(R.string.error_failed_to_select), Toast.LENGTH_LONG).show();
}
return builder.create();
}
}
Activity.java：
private void addCustomSpinner() {
EditText yourEt = (EditText) findViewById(R.id.your_et);
yourEt.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
showCustomSpinnerDialog(view);
}
});
}
private void showCustomSpinnerDialog(View v) {
int titleId = R.string.your_label;
int listId = R.array.spinner_selections;
int editTextId = R.id.your_et;
SpinnerFragment spinnerFragment = SpinnerFragment.newInstance(titleId, listId, editTextId);
spinnerFragment.show(getFragmentManager(), "customSpinner");
}
结果
单击微调器样式为TextInputLayout的微调器时，它将触发一个警报对话框，其中包含您的选择列表。选择一个选项后，将使用您的选择填充EditText，标签将按照您的需要浮动。
