我已经开发了一个例子。
在这里,我必须设置一个微调器提示。请帮我。我该如何设计呢?
这是我的 string.xml 代码:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, CustomizedListView!</string>
<string name="app_name">CustomizedListView</string>
<string name="status_prompt">Choose a Status</string>
</resources>
此代码用于我的main.xml:
<Spinner android:id="@+id/spinner1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_x="106dp"
android:layout_y="100dp"
android:prompt="@string/status_prompt"
android:background="@drawable/btn_dropdown"/>
我希望在下面的图片中更改背景颜色和textSize
,textStyle
。我怎样才能改变这一点。
修改 我在 styles.xml
中添加了以下代码<style name="spinner_style">
<item name="android:layout_width">fill_parent</item>
<item name="android:layout_height">wrap_content</item>
<item name="android:textColor">#040404</item>
<item name="android:typeface">monospace</item>
<item name="android:background">#FFFFFF</item>
</style>
还在main.xml的下面添加了spinner:
style="@style/spinner_style"
但它也不适用于我。如何设置微调器提示信息的样式。
修改
这是ArrayAdaper
的我的java代码:
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, list);
//set the view for the Drop down list
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
//set the ArrayAdapter to the spinner
spinner.setAdapter(adapter);
adapter.notifyDataSetChanged();
//attach the listener to the spinner
spinner.setOnItemSelectedListener(new MyOnItemSelectedListener());
}
如何在此处设置提示样式。
答案 0 :(得分:3)
为了更改提示,您需要使用与@ aswin-kumar建议的方法类似的方法,但为下拉列表的第一个元素使用单独的样式:
首先,展开ArrayAdapter
并将其称为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dropdown_header.xml
使用以下布局:
<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,将新适配器附加到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
,并设置相应文件的样式,您应该好好去。
答案 1 :(得分:2)
您需要为从ArrayAdapter
延伸的微调器创建自己的适配器。当布局系统指示您需要绘制您在pic中显示的视图时,将调用getView()
函数。您可以覆盖它并添加textSize,textStyle等
更新:粗略的代码示例如下:
private class MySpinnerAdapter extends ArrayAdapter<String> {
public MySpinnerAdapter(Context context, int resource,
int textViewResourceId, List<String> objects) {
super(context, resource, textViewResourceId, objects);
}
public View getView(int position, View convertView,
ViewGroup parent) {
View v = super.getView(position, convertView, parent);
// apply the style and sizes etc to the Text view from this view v
// like ((TextView)v).setTextSize(...) etc
return v;
}
public View getDropDownView(int position, View convertView,
ViewGroup parent) {
// this is for each of the drop down resource that is created.
// you can style these things too
}
}
使用它作为微调器的适配器:
mySpinner.setAdapter(new MySpinnerAdapter(ActivityName.this,
R.layout.spinner_item,
R.id.spinner_item_TextView,
listOfItemsInSpinner));