ActionBar 适配器下拉菜单

下面通过适配器添加下拉列表在ActionBar上面:

package com.example.androidnavigationmode;

import android.annotation.SuppressLint;
import android.app.ActionBar;
import android.app.ActionBar.OnNavigationListener;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.SpinnerAdapter;
import android.widget.TextView;


@SuppressLint("ValidFragment")
public class HelloActionBarActivity extends Activity{
    private static final String TAG = "HelloActionBarActivity";
    public final static int TAB_INDEX_1 = 0;
    public final static int TAB_INDEX_2 = 1;
    public final static int TAB_INDEX_3 = 2;
    public final static int TAB_COUNT = 3;
    
    private ActionBar actionBar;
    private OnNavigationListener mOnNavigationListener;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.v(TAG, "onCreate");
        setContentView(R.layout.main);

        actionBar = getActionBar();
        //设置AcitonBar的操作模型
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
        
        SpinnerAdapter mSpinnerAdapter = ArrayAdapter.createFromResource(this, R.array.action_list,
                android.R.layout.simple_spinner_dropdown_item);
        
        mOnNavigationListener = new OnNavigationListener() {
              // Get the same strings provided for the drop-down's ArrayAdapter
              String[] strings = getResources().getStringArray(R.array.action_list);

              @Override
              public boolean onNavigationItemSelected(int position, long itemId) {
                // Create new fragment from our own Fragment class
                ListContentFragment newFragment = new ListContentFragment();
                /*FragmentTransaction ft = getFragmentManager().beginTransaction();
                ft.replace(R.id.context, newFragment, strings[position]);
                ft.commit();*/
                return true;
              }
            };

        actionBar.setListNavigationCallbacks(mSpinnerAdapter, mOnNavigationListener);
    }

    public class ListContentFragment extends Fragment{
        private String mText;

        @Override
        public void onAttach(Activity activity) {
          // This is the first callback received; here we can set the text for
          // the fragment as defined by the tag specified during the fragment transaction
          super.onAttach(activity);
          mText = getTag();
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            // This is called to define the layout for the fragment;
            // we just create a TextView and set its text to be the fragment tag
            TextView text = new TextView(getActivity());
            text.setText(mText);
            return text;
        }
    }
}

其中一个列表名称列表:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="action_list">
        <item >item_list1</item>
        <item >item_list2</item>
        <item >item_list3</item>
    </string-array>
</resources>