Spinner的两种用法

Spinner是一个列表选择框，它有两种用法：

一种是使用android:entries属性的，一种是不使用该属性，，通过动态的添加Adapter来实现的。

第一种：

MainActivity.java:

import android.app.Activity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Spinner;import android.widget.Toast;public class MainActivity extends Activity implements OnClickListener{private Spinner spinner;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);spinner = (Spinner) findViewById(R.id.spinner);Button button = (Button) findViewById(R.id.button);button.setOnClickListener(this);}@Overridepublic void onClick(View v) {// TODO Auto-generated method stubString tip = spinner.getSelectedItem().toString();Toast.makeText(MainActivity.this, tip, 0).show();}}activity_main.xml:

<LinearLayout xmlns:android=""xmlns:tools=""android:layout_width="fill_parent"android:layout_height="fill_parent"android:orientation="vertical"android:paddingBottom="@dimen/activity_vertical_margin"android:paddingLeft="@dimen/activity_horizontal_margin"android:paddingRight="@dimen/activity_horizontal_margin"android:paddingTop="@dimen/activity_vertical_margin"tools:context="com.example.spinnerdemo.MainActivity" ><TextViewandroid:layout_width="fill_parent"android:layout_height="wrap_content"android:text="选择一个省份" /><Spinnerandroid:id="@+id/spinner"android:layout_width="fill_parent"android:layout_height="wrap_content"android:entries="@array/province" /><Buttonandroid:id="@+id/button"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="确定" /></LinearLayout>province.xml:

<?xml version="1.0" encoding="utf-8"?><resources><string-array name="province"><item >四川</item><item >山东</item><item >河北</item><item >广东</item></string-array></resources>

第二种：

MAinActivity.java:

import android.R.anim;import android.app.Activity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.ArrayAdapter;import android.widget.Button;import android.widget.Spinner;import android.widget.Toast;public class MainActivity extends Activity implements OnClickListener {private Spinner spinner;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);spinner = (Spinner) findViewById(R.id.city);Button button = (Button) findViewById(R.id.button);String arr[] = { "北京", "上海", "广州", "深圳" };// 创建ArrayAdapter对象ArrayAdapter<String> adapter = new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_list_item_multiple_choice, arr);spinner.setAdapter(adapter);button.setOnClickListener(this);}@Overridepublic void onClick(View v) {// TODO Auto-generated method stubString tip = spinner.getSelectedItem().toString();Toast.makeText(MainActivity.this, tip, 0).show();}}activity_main.xml:

<LinearLayout xmlns:android=""xmlns:tools=""android:layout_width="fill_parent"android:layout_height="fill_parent"android:orientation="vertical"android:paddingBottom="@dimen/activity_vertical_margin"android:paddingLeft="@dimen/activity_horizontal_margin"android:paddingRight="@dimen/activity_horizontal_margin"android:paddingTop="@dimen/activity_vertical_margin"tools:context="com.example.spinnerdemo2.MainActivity" ><TextViewandroid:layout_width="fill_parent"android:layout_height="wrap_content"android:text="选择一个城市"/><Spinnerandroid:id="@+id/city"android:layout_width="fill_parent"android:layout_height="wrap_content" /><Buttonandroid:id="@+id/button"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="确定"/></LinearLayout>

将会错过更好的风景，保持一份平和，保持一份清醒。