Android 抽屉效果的导航菜单实现

抽屉效果的导航菜单

　　看了很多应用，觉得这种侧滑的抽屉效果的菜单很好。

　　不用切换到另一个页面，也不用去按菜单的硬件按钮，直接在界面上一个按钮点击，菜单就滑出来，而且感觉能放很多东西。

　　关于实现，搜索了一下，有如下两种：

　　1.用SlidingDrawer：

　　http://developer.android.com/reference/android/widget/SlidingDrawer.html

　　但是不知道为什么这个类官方不建议再继续用了：

　　Deprecated since API level 17

　　2.用DrawerLayout：

　　http://developer.android.com/reference/android/support/v4/widget/DrawerLayout.html

　　Guide在这里：

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

库的引用

　　首先， DrawerLayout这个类是在Support Library里的，需要加上android-support-v4.jar这个包。

　　然后程序中用时在前面导入import android.support.v4.widget.DrawerLayout;

　　如果找不到这个类，首先用SDK Manager更新一下Android Support Library，然后在Android SDK\extras\android\support\v4路径下找到android-support-v4.jar，复制到项目的libs路径，将其Add to Build Path.

代码1

　　布局：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent" ><android.support.v4.widget.DrawerLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/drawer_layout"android:layout_width="match_parent"android:layout_height="match_parent" ><!-- The main content view --><!-- main content must be the first element of DrawerLayout because it will be drawn first and drawer must be on top of it --><FrameLayoutandroid:id="@+id/content_frame"android:layout_width="match_parent"android:layout_height="match_parent" /><!-- The navigation drawer --><ListViewandroid:id="@+id/left_drawer"android:layout_width="240dp"android:layout_height="match_parent"android:layout_gravity="left"android:background="#111"android:choiceMode="singleChoice"android:divider="@android:color/transparent"android:dividerHeight="0dp" /></android.support.v4.widget.DrawerLayout></RelativeLayout>

　　DrawerLayout的第一个子元素是主要内容，即抽屉没有打开时显示的布局。这里采用了一个FrameLayout，里面什么也没放。

　　DrawerLayout的第二个子元素是抽屉中的内容，即抽屉布局，这里采用了一个ListView。

　　主要的Activity（从官方实例中扒出来的）：

package com.example.hellodrawer;import android.os.Bundle;
import android.app.Activity;
import android.content.res.Configuration;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;public class HelloDrawerActivity extends Activity
{private String[] mPlanetTitles;private DrawerLayout mDrawerLayout;private ActionBarDrawerToggle mDrawerToggle;private ListView mDrawerList;@Overridepublic void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_hello_drawer);mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);// init the ListView and Adapter, nothing new
        initListView();// set a custom shadow that overlays the main content when the drawer// opens
        mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow,GravityCompat.START);mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,R.drawable.ic_drawer, R.string.drawer_open,R.string.drawer_close){/** Called when a drawer has settled in a completely closed state. */public void onDrawerClosed(View view){invalidateOptionsMenu(); // creates call to// onPrepareOptionsMenu()
            }/** Called when a drawer has settled in a completely open state. */public void onDrawerOpened(View drawerView){invalidateOptionsMenu(); // creates call to// onPrepareOptionsMenu()
            }};// Set the drawer toggle as the DrawerListener
        mDrawerLayout.setDrawerListener(mDrawerToggle);// enable ActionBar app icon to behave as action to toggle nav drawergetActionBar().setDisplayHomeAsUpEnabled(true);// getActionBar().setHomeButtonEnabled(true);// Note: getActionBar() Added in API level 11
    }private void initListView(){mDrawerList = (ListView) findViewById(R.id.left_drawer);mPlanetTitles = getResources().getStringArray(R.array.planets_array);// Set the adapter for the list viewmDrawerList.setAdapter(new ArrayAdapter<String>(this,R.layout.list_item, mPlanetTitles));// Set the list's click listenermDrawerList.setOnItemClickListener(new OnItemClickListener(){@Overridepublic void onItemClick(AdapterView<?> parent, View view,int position, long id){// Highlight the selected item, update the title, and close the// drawermDrawerList.setItemChecked(position, true);setTitle(mPlanetTitles[position]);mDrawerLayout.closeDrawer(mDrawerList);}});}@Overrideprotected void onPostCreate(Bundle savedInstanceState){super.onPostCreate(savedInstanceState);// Sync the toggle state after onRestoreInstanceState has occurred.
        mDrawerToggle.syncState();}@Overridepublic void onConfigurationChanged(Configuration newConfig){super.onConfigurationChanged(newConfig);mDrawerToggle.onConfigurationChanged(newConfig);}@Overridepublic boolean onOptionsItemSelected(MenuItem item){// Pass the event to ActionBarDrawerToggle, if it returns// true, then it has handled the app icon touch eventif (mDrawerToggle.onOptionsItemSelected(item)){return true;}// Handle your other action bar items...return super.onOptionsItemSelected(item);}}

　　比较纠结的是用了Level 11的一个API，这样minSdkVersion就有限制，不能太低。

　　图片资源Android官网示例处提供下载了。

　　程序运行后效果如下：

　　抽屉打开前：

　　抽屉打开后：

代码2

　　今天又看了一下DrawerLayout的类，发现有很多方法可以直接用的。

　　重新试了一下，其实不用上面那么麻烦，随便自己定义一个按钮控制抽屉的打开就行：

　　布局：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:paddingBottom="@dimen/activity_vertical_margin"android:paddingLeft="@dimen/activity_horizontal_margin"android:paddingRight="@dimen/activity_horizontal_margin"android:paddingTop="@dimen/activity_vertical_margin"tools:context=".DrawerActivity" ><android.support.v4.widget.DrawerLayoutandroid:id="@+id/drawer_layout"android:layout_width="match_parent"android:layout_height="match_parent" ><!-- The main content view --><FrameLayoutandroid:id="@+id/content_frame"android:layout_width="match_parent"android:layout_height="match_parent" ><Buttonandroid:id="@+id/btn"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="open" /></FrameLayout><!-- The navigation drawer --><ListViewandroid:id="@+id/left_drawer"android:layout_width="240dp"android:layout_height="match_parent"android:layout_gravity="start"android:background="#111"android:choiceMode="singleChoice"android:divider="@android:color/transparent"android:dividerHeight="0dp" /></android.support.v4.widget.DrawerLayout></RelativeLayout>

　　主要代码：

package com.example.hellodrawer;import android.os.Bundle;
import android.app.Activity;
import android.support.v4.widget.DrawerLayout;
import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;public class DrawerActivity extends Activity
{private DrawerLayout mDrawerLayout = null;@Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_drawer);mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);Button button = (Button) findViewById(R.id.btn);button.setOnClickListener(new OnClickListener(){@Overridepublic void onClick(View v){// 按钮按下，将抽屉打开
                mDrawerLayout.openDrawer(Gravity.LEFT);}});}}

参考资料

　　官方教程：

　　http://developer.android.com/design/patterns/navigation-drawer.html

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

　　其他参考资料：

　　http://blog.chengyunfeng.com/?p=493

　　http://my.eoe.cn/appadventure/archive/3826.html