下拉框Spinner就这么简单

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:orientation="vertical"
              android:padding="5dp" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="选择专业方向"
        android:textColor="#44BDED"
        android:textSize="18sp" />

    <Spinner
        android:id="@+id/spin_one"
        android:layout_width="100dp"
        android:layout_height="64dp"
        android:entries="@array/professionals"
        android:spinnerMode="dialog" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:text="选择教科书"
        android:textColor="#F5684A"
        android:textSize="18sp" />

    <Spinner
        android:id="@+id/spin_two"
        android:layout_width="wrap_content"
        android:layout_height="64dp" />
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="professionals">
        <item>Android</item>
        <item>Java</item>
        <item>Python</item>
        <item>PHP</item>
        <item>.Net</item>
        <item>C++</item>
        <item>C</item>
    </string-array>
</resources>

package com.jinyu.cqkxzsxy.android.listviewsample;


import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;


public class SpinnerActivity extends AppCompatActivity
        implements AdapterView.OnItemSelectedListener {
    private Spinner mProSpinner = null;
    private Spinner mBookSpinner = null;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.spinner_layout);


        // 获取界面布局文件中的Spinner组件
        mProSpinner = (Spinner) findViewById(R.id.spin_one);
        mBookSpinner = (Spinner) findViewById(R.id.spin_two);


        String[] arr = { "初识Android开发", "Android初识开发", "Android中级开发",
                "Android高级开发", "Android开发进阶"};

        // 创建ArrayAdapter对象
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, arr);

        // 为Spinner设置Adapter
        mBookSpinner.setAdapter(adapter);


        // 为Spinner设置选中事件监听器
        mProSpinner.setOnItemSelectedListener(this);
        mBookSpinner.setOnItemSelectedListener(this);
    }


    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        String content = parent.getItemAtPosition(position).toString();
        switch (parent.getId()){
            case R.id.spin_one:
                Toast.makeText(SpinnerActivity.this, "选择的专业是：" + content,
                        Toast.LENGTH_SHORT).show();
                break;
            case R.id.spin_two:
                Toast.makeText(SpinnerActivity.this, "选择的教材是：" + content,
                        Toast.LENGTH_SHORT).show();
                break;
            default:
                break;
        }
    }


    @Override
    public void onNothingSelected(AdapterView<?> adapterView) {
    }
}