Android DrawerLayout抽屉效果

官网guide：http://developer.android.com/training/implementing-navigation/nav-drawer.html
官网示例：NavigationDrawer.zip
android.support.v4.widget.DrawerLayout 抽屉layout。该widget只能实现从左向右、从右向左
openDrawer(), closeDrawer(), isDrawerOpen()
示例图：(示例图中增加了左右菜单功能，下面的代码基本还是官方原版的)
下面贴一下示例的主要的布局文件和 activity实现
activity_main.xml
package com.stone.drawerlayout;/* * Copyright 2013 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *     http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */import java.util.Locale;import android.app.Activity;import android.app.Fragment;import android.app.FragmentManager;import android.app.SearchManager;import android.content.Intent;import android.content.res.Configuration;import android.os.Bundle;import android.support.v4.app.ActionBarDrawerToggle;import android.support.v4.view.GravityCompat;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;import android.widget.Toast;/** * This example illustrates a common usage of the DrawerLayout widget * in the Android support library. *  * 
When a navigation (left) drawer is present, the host activity should detect presses of * the action bar's Up affordance as a signal to open and close the navigation drawer. The * ActionBarDrawerToggle facilitates this behavior. * Items within the drawer should fall into one of two categories:
 *  * 
 * View switches. A view switch follows the same basic policies as * list or tab navigation in that a view switch does not create navigation history. * This pattern should only be used at the root activity of a task, leaving some form * of Up navigation active for activities further down the navigation hierarchy.
 * Selective Up. The drawer allows the user to choose an alternate * parent for Up navigation. This allows a user to jump across an app's navigation * hierarchy at will. The application should treat this as it treats Up navigation from * a different task, replacing the current task stack using TaskStackBuilder or similar. * This is the only form of navigation drawer that should be used outside of the root * activity of a task.
 * 
 *  * 
Right side drawers should be used for actions, not navigation. This follows the pattern * established by the Action Bar that navigation should be to the left and actions to the right. * An action should be an operation performed on the current contents of the window, * for example enabling or disabling a data overlay on top of the current content.
 */public class MainActivity extends Activity {    private DrawerLayout mDrawerLayout;    private ListView mDrawerList;    private ActionBarDrawerToggle mDrawerToggle;    private CharSequence mDrawerTitle;    private CharSequence mTitle;    private String[] mPlanetTitles;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mTitle = mDrawerTitle = getTitle();        mPlanetTitles = getResources().getStringArray(R.array.planets_array);        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);        mDrawerList = (ListView) findViewById(R.id.left_drawer);//抽屉里的view        // set a custom shadow that overlays the main content when the drawer opens        mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);//设置shadow        // set up the drawer's list view with items and click listener        mDrawerList.setAdapter(new ArrayAdapter(this,                R.layout.drawer_list_item, mPlanetTitles));        mDrawerList.setOnItemClickListener(new DrawerItemClickListener());        // enable ActionBar app icon to behave as action to toggle nav drawer   需要api level 11        getActionBar().setDisplayHomeAsUpEnabled(true);//给home icon的左边加上一个返回的图标        getActionBar().setHomeButtonEnabled(true); //需要api level 14  使用home-icon 可点击        // ActionBarDrawerToggle ties together the the proper interactions        // between the sliding drawer and the action bar app icon        mDrawerToggle = new ActionBarDrawerToggle(//v4控件  actionbar上的抽屉开关                this,                  /* host Activity */                mDrawerLayout,         /* DrawerLayout object */                R.drawable.ic_drawer,  /* nav drawer image to replace 'Up' caret *///上一级图标 返回图标                R.string.drawer_open,  /* "open drawer" description for accessibility */                R.string.drawer_close  /* "close drawer" description for accessibility */                ) {            public void onDrawerClosed(View view) {//抽屉关闭后                getActionBar().setTitle(mDrawerTitle);                invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()            }            public void onDrawerOpened(View drawerView) {//抽屉打开后                getActionBar().setTitle(mTitle);                invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()            }                        @Override            public boolean onOptionsItemSelected(MenuItem item) {            if (item != null && item.getItemId() == android.R.id.home) {//actionbar上的home icon            //END即gravity.right 从右向左显示   START即left  从左向右弹出显示                    if (mDrawerLayout.isDrawerVisible(GravityCompat.END)) {                        mDrawerLayout.closeDrawer(GravityCompat.END);//关闭抽屉                    } else {                        mDrawerLayout.openDrawer(GravityCompat.END);//打开抽屉                    }                    return true;                }                return false;            }        };        mDrawerLayout.setDrawerListener(mDrawerToggle);//设置抽屉监听        if (savedInstanceState == null) {//            selectItem(0);        }    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {//加载menu  sdk3.0以后menu包含在actionbar中        MenuInflater inflater = getMenuInflater();        inflater.inflate(R.menu.main, menu);        return super.onCreateOptionsMenu(menu);    }    /* Called whenever we call invalidateOptionsMenu() */    @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_websearch).setVisible(!drawerOpen);//search的显示与drawer的显示相反        return super.onPrepareOptionsMenu(menu);    }    @Override    public boolean onOptionsItemSelected(MenuItem item) {         // The action bar home/up action should open or close the drawer.         // ActionBarDrawerToggle will take care of this.        if (mDrawerToggle.onOptionsItemSelected(item)) {            return true;        }        // Handle action buttons        switch(item.getItemId()) {        case R.id.action_websearch:            // create intent to perform web search for this planet            Intent intent = new Intent(Intent.ACTION_WEB_SEARCH);            intent.putExtra(SearchManager.QUERY, getActionBar().getTitle());            // catch event that there's no activity to handle intent            if (intent.resolveActivity(getPackageManager()) != null) {                startActivity(intent);            } else {                Toast.makeText(this, R.string.app_not_available, Toast.LENGTH_LONG).show();            }            return true;        default:            return super.onOptionsItemSelected(item);        }    }    /* The click listner for ListView in the navigation drawer */    private class DrawerItemClickListener implements ListView.OnItemClickListener {        @Override        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {            selectItem(position);        }    }      //内容区显示PlanetFragment    private void selectItem(int position) {        // update the main content by replacing fragments        Fragment fragment = new PlanetFragment();        Bundle args = new Bundle();        args.putInt(PlanetFragment.ARG_PLANET_NUMBER, position);        fragment.setArguments(args);        FragmentManager fragmentManager = getFragmentManager();        fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();        // update selected item and title, then close the drawer//        mDrawerList.setItemChecked(position, true);//        setTitle(mPlanetTitles[position]);        mDrawerLayout.closeDrawer(mDrawerList);    }    @Override    public void setTitle(CharSequence title) {    mDrawerTitle = title;        getActionBar().setTitle(mDrawerTitle);    }    /**     * When using the ActionBarDrawerToggle, you must call it during     * onPostCreate() and onConfigurationChanged()...     */    @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);        // Pass any configuration change to the drawer toggls        mDrawerToggle.onConfigurationChanged(newConfig);    }    /**     * 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";        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 = getResources().getStringArray(R.array.planets_array)[i];            //查找出 res-drawable资源的id            int imageId = getResources().getIdentifier(planet.toLowerCase(Locale.getDefault()),                            "drawable", getActivity().getPackageName());            ((ImageView) rootView.findViewById(R.id.image)).setImageResource(imageId);            getActivity().setTitle(planet);            return rootView;        }    }}
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