Android---24---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;

	@Override
	protected 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);
	}

	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
		String tip = spinner.getSelectedItem().toString();
		Toast.makeText(MainActivity.this, tip, 0).show();
	}
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/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" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="选择一个省份" />

    <Spinner
        android:id="@+id/spinner"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:entries="@array/province" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="确定" />

</LinearLayout>

<?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;

	@Override
	protected 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);
	}

	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
		String tip = spinner.getSelectedItem().toString();
		Toast.makeText(MainActivity.this, tip, 0).show();
	}
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/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" >
	<TextView 
	    android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="选择一个城市"
	    />
    <Spinner
        android:id="@+id/city"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
	<Button 
	    android:id="@+id/button"
	    android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="确定"
	    />
</LinearLayout>