Spinner用来显示列表项，类似于一组单选框RadioButton.下面瞥一下它的效果。

一、概述

Spinner是一个每次只能选择所有项的一个项的控件。它的项来自于与之相关联的适配器中。

二、重要属性

android:prompt：当Spinner对话框关闭时显示该提示

三、重要方法

setPrompt(CharSequence prompt)：设置当Spinner对话框关闭时显示的提示

performClick()：如果它被定义就调用此视图的OnClickListener

setOnItemClickListener(AdapterView.OnItemClickListener l)：当项被点击时调用

onDetachedFromWindow()：当Spinner脱离窗口时被调用。

四、完整代码

public class SpinnerDemo extends Activity {

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.spinnerpage);

Spinner s1 = (Spinner) findViewById(R.id.spinnercolor);

ArrayAdapter adapter = ArrayAdapter.createFromResource(

this, R.array.colors, android.R.layout.simple_spinner_item);

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

s1.setAdapter(adapter);

s1.setOnItemSelectedListener(

new OnItemSelectedListener() {

public void onItemSelected(

AdapterView> parent, View view, int position, long id) {

showToast("Spinner1: position=" + position + " id=" + id);

}

public void onNothingSelected(AdapterView> parent) {

showToast("Spinner1: unselected");

}

});

Spinner s2 = (Spinner) findViewById(R.id.spinnerplanet);

adapter = ArrayAdapter.createFromResource(this, R.array.planets,

android.R.layout.simple_spinner_item);

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

s2.setAdapter(adapter);

s2.setOnItemSelectedListener(

new OnItemSelectedListener() {

public void onItemSelected(

AdapterView> parent, View view, int position, long id) {

showToast("Spinner2: position=" + position+1 + " id=" + id+1);

}

public void onNothingSelected(AdapterView> parent) {

showToast("Spinner2: unselected");

}

});

}

private void showToast(CharSequence msg) {

Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();

}

}