布局文件
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity" android:orientation="vertical" > <Spinner android:id="@ id/spinner" android:layout_width="wrap_content" android:layout_height="wrap_content" android:entries="@array/ctype" /> <ListView android:id="@ id/listView" android:layout_width="wrap_content" android:layout_height="370dp" android:entries="@array/ctype" /> <HorizontalScrollView android:layout_width="match_parent" android:layout_height="wrap_content"> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <TextView android:layout_width="match_parent" android:layout_height="match_parent" android:text="@string/content" android:textSize="50sp" /> <TextView android:layout_width="match_parent" android:layout_height="match_parent" android:text="@string/content" android:textSize="50sp" /> </LinearLayout> </HorizontalScrollView> </LinearLayout>
java实现 视图-适配器-资源
package com.example.myhighuiiiii; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.widget.ArrayAdapter; import android.widget.ListView; import android.widget.Spinner; import android.widget.Toast; //通过适配器来实现 public class MainActivity extends AppCompatActivity { Spinner spinner = null; ListView listView = null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); /* * 下拉列表框实现 * */ String[] ctype = new String[]{ "全部","美术","音乐","体育" }; ArrayAdapter<String> adapter = new ArrayAdapter<String>( this,android.R.layout.simple_spinner_item,ctype ); //为适配器设置列表框下拉时的选项样式 adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); spinner = (Spinner) findViewById(R.id.spinner); //将适配器和下拉列表框关联起来 spinner.setAdapter(adapter); //获取下拉列表框的选中值 String string = spinner.getSelectedItem().toString(); Toast.makeText(this,string,Toast.LENGTH_SHORT); /* * 列表视图实现 * */ String[] cctype = new String[]{ "全部","图书","游戏","电视" }; //创建一个适配器 ArrayAdapter<String> adapter1 = new ArrayAdapter<String>( this,android.R.layout.simple_list_item_1,cctype ); //将适配器和listView相关联 listView = (ListView) findViewById(R.id.listView); listView.setAdapter(adapter); } }