Android 中下拉菜单，即如html中的<select>，关键在于调用setDropDownViewResource方法,以XML的方式定义下拉菜单要显示的模样
1.1.activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
tools:context="com.rj141.sb.kongjian.MainActivity">
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="18dp"
android:text="请选择您最喜欢的水果：" />
<Spinner
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/spinner" />
</LinearLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="18dp"
android:id="@+id/tv" />
</LinearLayout>
Spinner是下拉列表的组件
1.2.MainActivity.class
public class MainActivity extends AppCompatActivity {
private Spinner s;
String[] data=new String[]{"苹果","雪梨","西瓜","葡萄","橙子","草莓"};
private TextView tv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv= (TextView) this.findViewById(R.id.tv);
s= (Spinner) this.findViewById(R.id.spinner);
s.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,data));
s.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String str=data[position];
tv.setText("最喜欢的水果是："+str);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
}
}
s.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,data))；android.R.layout.simple_list_item_1是指安卓自带的下拉列表格式，data是数据源；
s.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()){..}；是下拉列表的监听
效果图：
以上就是本文的全部内容，希望对大家学习掌握Android实现下拉菜单Spinner组件有所帮助。