Spinner下拉列表

Spinner的實現效果如下


代碼如下

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">
<Spinner
    android:id="@+id/spinner"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"></Spinner>


</RelativeLayout>

public class MainActivity extends Activity {
    private Spinner mSpinner;
    private String[] array={"view_text","view_edit","view_list","layout_linear","layout_relative","layout_frame","layout_abosolutely","button"};
    private ArrayAdapter<String> adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mSpinner= (Spinner) findViewById(R.id.spinner);
        adapter=new ArrayAdapter<String>(this,android.R.layout.simple_spinner_dropdown_item,array);
        mSpinner.setAdapter(adapter);

    }


}