Android 控件之Spinner

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。

 

 

 

 

 

 

源码下载

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<CharSequence> 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();
     }
}