7.用户接口UI布局----View控件的概述之Spinner

Spinner 实现下拉选择

java.lang.Object
↳ android.view.View
↳ android.view.ViewGroup
↳ android.widget.AdapterView<T extends android.widget.Adapter>
↳ android.widget.AbsSpinner

↳android.widget.Spinner

// Layout/main.xml

<Spinner
android:id="@+id/planets_spinner"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />

// values/strings.xml

<string-array name="planets_array">
<item>Mercury</item>
<item>Venus</item>
<item>Earth</item>
<item>Mars</item>
<item>Jupiter</item>
<item>Saturn</item>
<item>Uranus</item>
<item>Neptune</item>
</string-array>

// MyActivity.java

Spinner spinner = (Spinner) findViewById(R.id.planets_spinner);
// Create an ArrayAdapter using the string array and a default spinner layout
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
R.array.planets_array, android.R.layout.simple_spinner_item);
// Specify the layout to use when the list of choices appears
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// Apply the adapter to the spinner
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new OnItemSelectedListener() {

public void onItemSelected(AdapterView<?> parent, View view,
int position, long id)
{
// TODO Auto-generated method stub

}

public void onNothingSelected(AdapterView<?> parent)
{
// TODO Auto-generated method stub

}
});