Android实现下拉菜单Spinner效果

2019-12-12 06:27:30

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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：