MainActivity.java

package com_1sters.app;

import java.util.Locale;

import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.content.res.Configuration;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.widget.DrawerLayout;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;

public class MainActivity extends Activity {
    
    private String[] mPlanetTitles = new String [] {"话题", "文章", "工作"};
    private CharSequence mTitle;
    private CharSequence mDrawerTitle;
    
    private DrawerLayout mDrawerLayout;
    private ActionBarDrawerToggle mDrawerToggle;
    private ListView mDrawerList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        mTitle = mDrawerTitle = getTitle();
        
        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        mDrawerToggle = new DrawActionBarDrawerToggle(
                            this, 
                            mDrawerLayout, 
                            R.drawable.ic_drawer, 
                            R.string.drawer_open, 
                            R.string.drawer_close);
        mDrawerLayout.setDrawerListener(mDrawerToggle);
        
        mDrawerList = (ListView) findViewById(R.id.left_drawer);
        mDrawerList.setAdapter(new ArrayAdapter<String>(
                this,
                R.layout.drawer_list_item,
                mPlanetTitles));
        mDrawerList.setOnItemClickListener(new DrawerItemClickListener());
        
        getActionBar().setDisplayHomeAsUpEnabled(true);
        getActionBar().setHomeButtonEnabled(true);
    }
    
    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        // Sync the toggle state after onRestoreInstanceState has occurred.
        mDrawerToggle.syncState();
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        mDrawerToggle.onConfigurationChanged(newConfig);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Pass the event to ActionBarDrawerToggle, if it returns
        // true, then it has handled the app icon touch event
        if (mDrawerToggle.onOptionsItemSelected(item)) {
          return true;
        }
        // Handle your other action bar items...

        return super.onOptionsItemSelected(item);
    }
    
    private class DrawerItemClickListener implements ListView.OnItemClickListener {
        
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            selectItem(position);
        }
    }
    
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.main, menu);
        return super.onCreateOptionsMenu(menu);
    }
    
    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        // If the nav drawer is open, hide action items related to the content view
        boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
        menu.findItem(R.id.action_search).setVisible(!drawerOpen);
        return super.onPrepareOptionsMenu(menu);
    }
    
    private void selectItem(int position) {
        // Create a new fragment and specify the planet to show based on position
        Fragment fragment = new PlanetFragment();
        Bundle args = new Bundle();
        args.putInt(PlanetFragment.ARG_PLANET_NUMBER, position);
        fragment.setArguments(args);

        // Insert the fragment by replacing any existing fragment
        FragmentManager fragmentManager = getFragmentManager();
        fragmentManager.beginTransaction()
                       .replace(R.id.content_frame, fragment)
                       .commit();

        // Highlight the selected item, update the title, and close the drawer
        mDrawerList.setItemChecked(position, true);
        setTitle(mPlanetTitles[position]);
        mDrawerLayout.closeDrawer(mDrawerList);
    }
    
    @Override
    public void setTitle(CharSequence title) {
        mTitle = title;
        getActionBar().setTitle(mTitle);
    }
    
    /**
     * Fragment that appears in the "content_frame", shows a planet
     */
    public static class PlanetFragment extends Fragment {
        
        public static final String ARG_PLANET_NUMBER = "planet_number";
        private static final String [] mPlanets = new String [] {"Mercury", "Venus", "Earth"};
        
        public PlanetFragment() {
            // Empty constructor required for fragment subclasses
        }

        @Override
        public View onCreateView(
                LayoutInflater inflater, 
                ViewGroup container,
                Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_planet, container, false);
            
            int i = getArguments().getInt(ARG_PLANET_NUMBER);
            String planet = mPlanets[i];

            int imageId = getResources().getIdentifier(
                            planet.toLowerCase(Locale.getDefault()),
                            "drawable",
                            getActivity().getPackageName());
            
            ((ImageView) rootView.findViewById(R.id.image)).setImageResource(imageId);
            
            return rootView;
        }
    }
    
    private class DrawActionBarDrawerToggle extends ActionBarDrawerToggle {

        public DrawActionBarDrawerToggle(
                Activity activity,
                DrawerLayout drawerLayout,
                int drawerImageRes,
                int openDrawerContentDescRes, 
                int closeDrawerContentDescRes) {
            super(activity, drawerLayout, drawerImageRes, openDrawerContentDescRes,
                    closeDrawerContentDescRes);
        }
        
        public void onDrawerClosed(View view) {
            super.onDrawerClosed(view);
            getActionBar().setTitle(mTitle);
            invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
        }

        public void onDrawerOpened(View drawerView) {
            super.onDrawerOpened(drawerView);
            getActionBar().setTitle(mDrawerTitle);
            invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
        }
        
    }

}