为了更改提示,您需要使用与@aswin-kumar 建议的方法类似的方法,但下拉列表的第一个元素使用单独的样式:
首先,扩展ArrayAdapter
并调用它CustomArrayAdapter
:package com.example.project;
package com.example.project;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
import android.widget.TextView;
import java.util.List;
// I extend this using ArrayAdapter<String>, but you can use anything as the type
// parameter, or parameterize it as necessary.
public class CustomArrayAdapter extends ArrayAdapter<String> {
private String title;
public CustomArrayAdapter(Context aContext, int aTextViewResource, List<String> aOptions, String title) {
super(aContext, aTextViewResource, aOptions);
this.title = title;
}
@Override
public View getDropDownView(int aPosition, View aConvertView, ViewGroup aParent) {
LinearLayout v = null;
if (aPosition == 0) {
LayoutInflater inflater = (LayoutInflater)getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = (LinearLayout) inflater.inflate(R.layout.dropdown_header, aParent, false);
TextView tv = (TextView) v.findViewById(R.id.dropdown_item);
tv.setText(getItem(aPosition));
} else {
LayoutInflater inflater = (LayoutInflater)getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = (LinearLayout) inflater.inflate(R.layout.dropdown_item, aParent, false);
TextView tv = (TextView) v.findViewById(R.id.dropdown_item);
tv.setText(getItem(aPosition));
tv.setHeight((int) (tv.getTextSize() * 2));
}
return v;
}
@Override
public int getCount() {
return super.getCount() + 1;
}
@Override
public String getItem(int position) {
if (position == 0) {
return title;
}
return super.getItem(position - 1);
}
@Override
public boolean isEnabled(int position) {
return position != 0;
}
}
现在,为您的 使用以下布局dropdown_header.xml
:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/dropdown_item"
android:textColor="@android:color/black"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="16dp"
android:paddingBottom="16dp"
android:paddingLeft="16dp"
android:gravity="left|center_vertical"
android:textSize="9pt" />
<!-- This adds a black separator line between the title and the items. You can remove
if you want -->
<LinearLayout
android:id="@+id/separator"
android:layout_height="4dp"
android:layout_width="match_parent"
android:background="@android:color/black"
android:orientation="vertical"/>
</LinearLayout>
表单视图布局文件(form_view_layout.xml):
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/spinner_dialog_root"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="9pt" />
微调器布局文件 ( spinner_layout.xml
):
<Spinner
android:id="@+id/spinner"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:background="@android:color/transparent"/>
现在,将新适配器连接到您的Spinner
:
CustomArrayAdapter adapter = new CustomArrayAdapter(aActivity, R.layout.form_view_layout, aModel.getEnumerableOptions(), aModel.getTitle());
View parentView = aActivity.getLayoutInflater().inflate(R.layout.spinner_layout, aParent, false);
spinner = (Spinner) parentView.findViewById(R.id.spinner);
spinner.setAdapter(adapter);
最后,将要显示的字符串添加到微调器适配器,adapter
并设置适当的文件样式,一切顺利。