package com.example.aimee.spinnertest;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.AdapterView;

import android.widget.ArrayAdapter;

import android.widget.Spinner;

import android.widget.Toast;

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);

        ArrayAdapter<?>adapter=ArrayAdapter.createFromResource(this,R.array.color,android.R.layout.simple_list_item_1);

        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

        spinner.setAdapter(adapter);

        AdapterView.OnItemSelectedListener itemSelectedListener=new AdapterView.OnItemSelectedListener() {

            @Override

            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

                Toast.makeText(MainActivity.this,"选择的色彩"+parent.getItemAtPosition(position).toString(),Toast.LENGTH_LONG).show();

            }

            @Override

            public void onNothingSelected(AdapterView<?> parent) {

                Toast.makeText(MainActivity.this,"Nothing is selected",Toast.LENGTH_LONG).show();

            }

        };

        spinner.setOnItemSelectedListener(itemSelectedListener);

    }

}

<?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.ConstraintLayout 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">

    <Spinner

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:id="@+id/spinner"

        android:entries="@array/color"

        >

    </Spinner>

</android.support.constraint.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>

<resources>

    <string-array name="color">

        <item>red</item>

        <item>blue</item>

        <item>yellow</item>

        <item>pink</item>

        <item>orange</item>

    </string-array>

</resources>

android:spinnerMode="dialog"

android:prompt="@string/title"//设置显示的标题，请选择颜色，一般弹窗模式会用到。

<?xml version="1.0" encoding="utf-8"?>

    <TextView

        xmlns:android="http://schemas.android.com/apk/res/android"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:textColor="#f77718"

        android:textSize="15sp"

        android:padding="10dp"

        android:singleLine="true"

        android:text="New Text"

        android:id="@+id/textView32"

        />

<?xml version="1.0" encoding="utf-8"?>

    <TextView

        xmlns:android="http://schemas.android.com/apk/res/android"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:text="New Text"

        android:padding="10dp"

        android:singleLine="true"

        android:textSize="30sp"

        android:textColor="#f77718"

        android:background="#ffffffff"

        android:id="@+id/textView3333"

        />