使用Spinner组件实现如下效果

    

    



 

 

package com.example.ui4;

import java.util.ArrayList;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.ArrayAdapter;
import android.widget.Spinner;

public class MainActivity extends Activity {
	Spinner spin;
	private static final String[] mCountries = { "China", "Russia", "Germany",
			"Ukraine", "Belarus", "USA" };

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		Spinner spin = (Spinner) findViewById(R.id.spinner_2);
		ArrayAdapter adapter = ArrayAdapter.createFromResource(
				this, R.array.countries, android.R.layout.simple_spinner_item);
		adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
		spin.setAdapter(adapter);

	}

	private void find_and_modify_view() {
		spin = (Spinner) findViewById(R.id.spinner_1);
		ArrayList allcountries = new ArrayList();
		for (int i = 0; i < mCountries.length; i++) {
			allcountries.add(mCountries[i]);
		}
		ArrayAdapter aspnCountries = new ArrayAdapter(this,
				android.R.layout.simple_spinner_item, allcountries);
		aspnCountries
				.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);// 设定下拉菜单的样式
		spin.setAdapter(aspnCountries);

	}

	@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;
	}

}