Android ActionBar下拉選項

標籤：android   style   blog   class   code   java   

package com.example.actionBarTest.actionBarList;import android.app.ActionBar;import android.app.Activity;import android.app.Fragment;import android.os.Bundle;import android.widget.ArrayAdapter;import android.widget.SpinnerAdapter;import com.example.actionBarTest.R;import java.util.ArrayList;import java.util.List;/** * Created by Heyiyong on 2014-5-2 上午9:50. */public class ListNavigationActivity extends Activity implements ActionBar.OnNavigationListener {    private List<Fragment> fragments;    private String[] navs = {"添加", "刪除", "編輯", "查詢", "更多"};    private SpinnerAdapter spinnerAdapter;    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.tab_main);        spinnerAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, navs);        HomeFragment homeFragment = new HomeFragment();        MusicFragment musicFragment = new MusicFragment();        VideoFragment videoFragment = new VideoFragment();        fragments = new ArrayList<Fragment>();        fragments.add(homeFragment);        fragments.add(musicFragment);        fragments.add(homeFragment);        fragments.add(videoFragment);        fragments.add(homeFragment);        ActionBar actionBar = getActionBar();        if (actionBar != null) {            actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);            actionBar.setListNavigationCallbacks(spinnerAdapter, this);        }    }    @Override    public boolean onNavigationItemSelected(int itemPosition, long itemId) {        System.out.println("itemPosition = " + itemPosition);        getFragmentManager().beginTransaction().replace(R.id.tab_main, fragments.get(itemPosition)).commit();        return true;    }}

 actionBar.setListNavigationCallbacks(spinnerAdapter, this);
這個ArrayAdapter是繼承於BaseAdapter的，而BaseAdapter又實現了SpinnerAdapter介面.