Spinner用法案例

Spinner控件也是一种列表类型的控件，它的继承关系如下：
java.lang.Object
   ↳ android.view.View
     ↳ android.view.ViewGroup
       ↳ android.widget.AdapterView<T extends android.widget.Adapter>
         ↳ android.widget.AbsSpinner
           ↳ android.widget.Spinner
android.widget.Spinner继承了android.view.ViewGroup类。下面安排一个案例如图6-5，有两个Spinner，颜色选择Spinner和星座选择Spinner。点击颜色选择Spinner右边的按钮，如图6-6所示，弹出单选对话框。图6-7 星座选择Spinner
程序代码请参考代码清单6-3：
【代码清单6-3】 chapter6_2/src/com/work/SpinnerActivity.java
public class SpinnerActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        final TextView txt2 = (TextView) findViewById(R.id.TextView02);
        Spinner s1 = (Spinner) findViewById(R.id.Spinner01);
        final 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) {
                            txt2.setText(adapter.getItem(position).toString());
                    }

public void onNothingSelected(AdapterView<?> parent) {
                    txt2.setText("没选中的");
                    }
                });

final TextView txt4 = (TextView) findViewById(R.id.TextView04);
        Spinner s2 = (Spinner) findViewById(R.id.Spinner02);
        ArrayAdapter<CharSequence> adapterC = new ArrayAdapter<CharSequence>(this,
                android.R.layout.simple_spinner_item, CONSTELLATIONS);
        adapterC.setDropDownViewResource(android.R.layout.simple_spinner_item);
        s2.setAdapter(adapterC);
        s2.setOnItemSelectedListener(
                new OnItemSelectedListener() {
                    public void onItemSelected(
                            AdapterView<?> parent, View view, int position, long id) {
                    txt4.setText(CONSTELLATIONS[position]);
                    }

public void onNothingSelected(AdapterView<?> parent) {
                    txt4.setText("没选中的");
                    }
                });
    }

    static final String[] CONSTELLATIONS = new String[] {
    "白羊座", "金牛座", "双子座",
    "巨蟹座", "狮子座", "处女座",
    "天枰座", "天蝎座", "射手座",
    "魔蝎座", "水瓶座", "双鱼座"
        };
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