下拉列表框

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal" tools:context=".MainActivity"> <Spinner android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/spinner" android:entries="@array/ctype" /> <EditText android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="搜索" /> </LinearLayout>

arrays.xml

<?xml version="1.0" encoding="utf-8"?> <resources> <string-array name="ctype"> <item>全部</item> <item>电影</item> <item>图书</item> <item>游戏</item> </string-array> </resources> package com.example.spinner; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.Spinner; import android.widget.Toast; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Spinner spinner=findViewById(R.id.spinner); spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { String result=parent.getItemAtPosition(position).toString(); Toast.makeText(MainActivity.this,result,Toast.LENGTH_SHORT).show(); } @Override public void onNothingSelected(AdapterView<?> parent) { } }); /*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); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); Spinner spinner=findViewById(R.id.spinner); spinner.setAdapter(adapter); String selectedItem = spinner.getSelectedItem().toString();*/ } }