jcgogo

說明：

當選取下拉式選單的Item，以Toast訊息顯示選取的內容。

畫面上的物件：

程式碼：

package com.example.converter; 

import android.app.Activity;

import android.os.Bundle;

import android.view.Menu;

import android.view.View;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemSelectedListener;

import android.widget.ArrayAdapter;

import android.widget.Spinner;

import android.widget.Toast;

public class MainActivity extends Activity {

private Spinner spinner01; //喧告Spinner物件

private String[] list = {"test1","test2","test3"}; //喧告字串陣列

    private ArrayAdapter<String> listAdapter; //喧告listAdapter物件

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        spinner01=(Spinner)findViewById(R.id.changetype1); //指向畫面上id為changetype1的Spinner物件

        listAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, list);

        spinner01.setAdapter(listAdapter);

        //設定項目被選取之後的動作

        spinner01.setOnItemSelectedListener(new OnItemSelectedListener(){

          @Override

            public void onItemSelected(AdapterView adapterView, View view, int position, long id) {

               Toast.makeText(MainActivity.this, "你選的是"+spinner01.getSelectedItem().toString(), Toast.LENGTH_SHORT).show();

            }

            @Override

            public void onNothingSelected(AdapterView arg0) {

               Toast.makeText(MainActivity.this, "您沒有選擇任何項目", Toast.LENGTH_LONG).show();

            }

        });

    }

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.main, menu);

        return true;

    }   

}

 測試結果：