Android----- 控件之Spinner

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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();      } }