[Use of Spinner for Android components]

The Spinner component is similar to the select drop-down list option in the Web system, as shown in the figure

First, the interface layout renderings

 

 

Second, the interface layout file source code

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical" android:layout_width="fill_parent"

android:layout_height="fill_parent">

<TextView android:layout_width="fill_parent"

android:layout_height="wrap_content" android:text="@string/hello" />

 

<TextView android:layout_width="fill_parent"

android:layout_height="wrap_content" android:text="Your current city:" />

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="horizontal" android:layout_width="wrap_content"

android:layout_height="wrap_content">

<TextView android:layout_width="fill_parent"

android:layout_height="wrap_content" android:text="城市:" />

<Spinner android:id="@+id/sp" android:layout_width="wrap_content"

android:layout_height="wrap_content" android:entries="@array/my_citys"

android:prompt="@string/info" />

<TextView android:layout_width="fill_parent"

android:layout_height="wrap_content" android:text="区域:" />

<Spinner android:id="@+id/areas" android:layout_width="wrap_content"

android:layout_height="wrap_content" android:entries="@array/my_areas"

android:prompt="@string/info" />

</LinearLayout>

<TextView android:layout_width="fill_parent"

android:layout_height="wrap_content" android:text="Your education level:" />

 

<Spinner android:id="@+id/sp1" android:layout_width="fill_parent"

android:layout_height="wrap_content" />

 

<TextView android:layout_width="fill_parent"

android:layout_height="wrap_content" android:text="你的婚姻状况:" />

 

<Spinner android:id="@+id/sp2" android:layout_width="wrap_content"

android:layout_height="wrap_content" />

</LinearLayout>

三、实现方式

1）方案一 采用XML实现

<Spinner android:id="@+id/sp" android:layout_width="wrap_content"

android:layout_height="wrap_content" android:entries="@array/my_citys"

android:prompt="@string/info" />

 

采用XML文件实现

/res/values/citys.xml

<?xml version="1.0" encoding="utf-8"?>

<resources>

    <string-array name="my_citys">

    <item>北京</item>

    <item>上海</item>

    <item>广东</item>

    </string-array>

    <string-array name="my_areas">

    <item>北京1</item>

    <item>上海2</item>

    <item>广州4</item>

    </string-array>

    <string-array name="edu">

    <item>初中</item>

    <item>高中</item>

    <item>大专</item>

    <item>本科</item>

    <item>研究生</item>

    </string-array>

    

 

</resources>

2）方案二 编码实现+XML实现

 

private Spinner sp;

private ArrayAdapter<CharSequence> aa;

 

sp = (Spinner) this.findViewById(R.id.sp1);

        aa = ArrayAdapter.createFromResource(this, R.array.edu, 

        android.R.layout.simple_spinner_item);

        aa.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

        sp.setPrompt("请选择你的受教育程度");

 

        sp.setAdapter(aa);

备注：R.array.edu代表资源ID

 

3）方案三 编码使用JAVA数组实现

 

private Spinner sp2;

sp2= (Spinner) this.findViewById(R.id.sp2);

String[] marry = new String[]{"未婚","已婚","离异"};

ArrayAdapter ad1 = new ArrayAdapter<String>(this, 

        android.R.layout.simple_spinner_item, marry);

ad1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

sp2.setPrompt("请选择你的婚姻状况:");

 

sp2.setAdapter(ad1);