package com.example.navigationdemo;

import android.os.Bundle;
import android.app.Activity;
import android.support.v4.widget.DrawerLayout;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class MainActivity extends Activity {
    private String[] mPlanetTiles;
    private DrawerLayout mDrawerLayout;
    private ListView mDrawerList;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mPlanetTiles = getResources().getStringArray(R.array.planets_array);
        mDrawerLayout= (DrawerLayout) findViewById(R.id.drawer_layout);
        mDrawerList= (ListView) findViewById(R.id.left_drawer);
        mDrawerList.setAdapter(new ArrayAdapter<String>(this,R.layout.drawer_list_item,mPlanetTiles));
        mDrawerList.setOnItemClickListener(new DrawerItemClickListener());
    }

    @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;
    }
    private class DrawerItemClickListener implements ListView.OnItemClickListener{

        @Override
        public void onItemClick(AdapterView parent, View view, int position,
                long id) {
            // TODO Auto-generated method stub
            selectItem(position);
        }
        
    }
    public void selectItem(int position) {
        // TODO Auto-generated method stub
        Log.d("",position+"");
    }
}

public void selectItem(int position) {
        // Create a new fragment and specify the planet to show based on position
        Log.d("",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()//此函数返回一个FragmentTransactiond对象，用来开始一系列对Fragments的操作
                       .replace(R.id.content_frame, fragment)//Replace an existing fragment that was added to a container
                                                                //依旧返回返回一个FragmentTransactiond对象
                       .commit();
     // Highlight the selected item, update the title, and close the drawer
        mDrawerList.setItemChecked(position, true);
        setTitle(mPlanetTitles[position]);
        mDrawerLayout.closeDrawer(mDrawerList);
    }
    public static class PlanetFragment extends Fragment {
        public static final String ARG_PLANET_NUMBER = "planet_number";

        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);
　　　　　　　　　　//作用类似于findViewById()。不同点是LayoutInflater是用来找res/layout/下的xml布局文件，并且实例化
                int i = getArguments().getInt(ARG_PLANET_NUMBER);
                String planet = getResources().getStringArray(R.array.planets_array)[i];

                int imageId = getResources().getIdentifier(planet.toLowerCase(Locale.getDefault()),
                                "drawable", getActivity().getPackageName());
                ((ImageView) rootView.findViewById(R.id.image)).setImageResource(imageId);
                getActivity().setTitle(planet);
                return rootView;
        }

<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/image"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#000000"
    android:gravity="center"
    android:padding="32dp" />

@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);
    }