android學習筆記4-Spinner

功能上大致與ListView 不做贅述

java 文件

package com.example.spiner;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.*;

publicclass MainActivity extends Activity {

TextView selection;

Spinner spin;

String[] items={"a","b","c","e"};

@Override

protectedvoid onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

//加載視圖文件，類似於C#的窗體設計

selection=(TextView)findViewById(R.id.selection);

//查找對應xml文件中的部件

spin=(Spinner)findViewById(R.id.spinner);

ArrayAdapter aa=new ArrayAdapter(this,android.R.layout.simple_spinner_dropdown_item,items);

//定義一個數組適配器《string》類型的，

//對應的三個參數分別為 所有者，外觀樣式，數據源

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

//定義下拉列表樣式

spin.setAdapter(aa);

//定義適配器

spin.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

//定義下拉事件，先打入 new AdapterView.OnItemSelectedListener()後，會提示是否自動生成對應的代碼

@Override

publicvoid onItemSelected(AdapterView parent, View v,

int position, long id) {

// TODO Auto-generated method stub

selection.setText(parent.getItemAtPosition(position).toString());

}

@Override

publicvoid onNothingSelected(AdapterView parent) {

// TODO Auto-generated method stub

selection.setText("nothing select");

}

});

}

}

xml文件

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

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical">

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:id="@+id/selection"

/>

android:id="@+id/spinner"

android:layout_width="match_parent"

android:layout_height="wrap_content"

/>