Android利用DrawerLayout實現抽屜效果

官網guide：http://developer.android.com/training/implementing-navigation/nav-drawer.html

官網示例：NavigationDrawer.zip  

android.support.v4.widget.DrawerLayout 抽屜layout。該widget只能實現從左向右、從右向左

   openDrawer(), closeDrawer(), isDrawerOpen()

下面貼一下示例的主要的布局文件 和 activity實現

    <android.support.v4.widget.DrawerLayout

        xmlns:android="http://schemas.android.com/apk/res/android&quot;

        android:id="@+id/drawer_layout"

        android:layout_width="match_parent"

        android:layout_height="match_parent">


    <FrameLayout  
        android:id="@+id/content_frame"  
        android:layout_width="match_parent"  
        android:layout_height="match_parent" />  

    <ListView  
        android:id="@+id/left_drawer"  
        android:layout_width="240dp"  
        android:layout_height="match_parent"  
        android:layout_gravity="right"  
        android:choiceMode="singleChoice"  
        android:divider="@android:color/transparent"  
        android:dividerHeight="0dp"  
        android:background="#111"/>  
    <!--   
        android:choiceMode  選中狀態 跟itemclick沒有沖突  
                none              值為0，表示無選擇模式；   
                singleChoice      值為1，表示最多可以有一項被選中；  
                multipleChoice    值為2，表示可以多項被選中。  

        android:layout_gravity  left或right  left或start   right或end  
            表示在抽屜里的效果是從左到右還是從右到左出現  
     -->  
</android.support.v4.widget.DrawerLayout>  </pre> 



    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. 
 * <p/> 
 * <p>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:</p> 
 * <p/> 
 * <ul> 
 * <li><strong>View switches</strong>. 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.</li> 
 * <li><strong>Selective Up</strong>. 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.</li> 
 * </ul> 
 * <p/> 
 * <p>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.</p> 
 */  
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);//抽屜里的view  

        // set a custom shadow that overlays the main content when the drawer opens  
        mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);//設置shadow  
        // set up the drawer's list view with items and click listener  
        mDrawerList.setAdapter(new ArrayAdapter<String>(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);//給home icon的左邊加上一個返回的圖標  
        getActionBar().setHomeButtonEnabled(true); //需要api level 14  使用home-icon 可點擊  

        // ActionBarDrawerToggle ties together the the proper interactions  
        // between the sliding drawer and the action bar app icon  
        mDrawerToggle = new ActionBarDrawerToggle(//v4控件  actionbar上的抽屜開關  
                this,                  /* host Activity */  
                mDrawerLayout,         /* DrawerLayout object */  
                R.drawable.ic_drawer,  /* nav drawer image to replace 'Up' caret */     //上一級圖標 返回圖標  
                R.string.drawer_open,  /* "open drawer" description for accessibility */  
                R.string.drawer_close  /* "close drawer" description for accessibility */  
                ) {  
            public void onDrawerClosed(View view) {//抽屜關閉后  
                getActionBar().setTitle(mDrawerTitle);  
                invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()  
            }  

            public void onDrawerOpened(View drawerView) {//抽屜打開后  
                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 從右向左顯示   START即left  從左向右彈出顯示  
                    if (mDrawerLayout.isDrawerVisible(GravityCompat.END)) {  
                        mDrawerLayout.closeDrawer(GravityCompat.END);//關閉抽屜  
                    } else {  
                        mDrawerLayout.openDrawer(GravityCompat.END);//打開抽屜  
                    }  
                    return true;  
                }  
                return false;  
            }  
        };  
        mDrawerLayout.setDrawerListener(mDrawerToggle);//設置抽屜監聽  

        if (savedInstanceState == null) {  
//            selectItem(0);  
        }  
    }  

    @Override  
    public boolean onCreateOptionsMenu(Menu menu) {//加載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的顯示與drawer的顯示相反  
        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);  
        }  
    }  

  //內容區顯示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資源的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;  
        }  
    }  
}  </pre>