24225800-d67641ea79e6410290af80dc5ea74015  

 

 

 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:

复制代码
<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.DrawerLayout    xmlns: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 --><FrameLayout      android:id="@+id/content_frame"      android:layout_width="match_parent"      android:layout_height="match_parent"/><!-- The navigation drawer --><ListView      android: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>
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  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):

 

复制代码
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;publicclass HelloDrawerActivity extends Activity{  private String[] mPlanetTitles;  private DrawerLayout mDrawerLayout;  private ActionBarDrawerToggle mDrawerToggle;  private ListView mDrawerList;  @Override  publicvoid 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. */publicvoid onDrawerClosed(View view)      {        invalidateOptionsMenu(); // creates call to                      // onPrepareOptionsMenu()      }      /** Called when a drawer has settled in a completely open state. */publicvoid 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 drawer
        getActionBar().setDisplayHomeAsUpEnabled(true);    // getActionBar().setHomeButtonEnabled(true);    // Note: getActionBar() Added in API level 11  }  privatevoid initListView()  {    mDrawerList = (ListView) findViewById(R.id.left_drawer);    mPlanetTitles = getResources().getStringArray(R.array.planets_array);    // Set the adapter for the list view
        mDrawerList.setAdapter(new ArrayAdapter<String>(this,        R.layout.list_item, mPlanetTitles));    // Set the list's click listener
        mDrawerList.setOnItemClickListener(new OnItemClickListener()    {      @Override      publicvoid onItemClick(AdapterView<?> parent, View view,          int position, long id)      {        // Highlight the selected item, update the title, and close the        // drawer
                mDrawerList.setItemChecked(position, true);        setTitle(mPlanetTitles[position]);        mDrawerLayout.closeDrawer(mDrawerList);      }    });  }  @Override  protectedvoid onPostCreate(Bundle savedInstanceState)  {    super.onPostCreate(savedInstanceState);    // Sync the toggle state after onRestoreInstanceState has occurred.    mDrawerToggle.syncState();  }  @Override  publicvoid onConfigurationChanged(Configuration newConfig)  {    super.onConfigurationChanged(newConfig);    mDrawerToggle.onConfigurationChanged(newConfig);  }  @Override  publicboolean onOptionsItemSelected(MenuItem item)  {    // Pass the event to ActionBarDrawerToggle, if it returns    // true, then it has handled the app icon touch eventif (mDrawerToggle.onOptionsItemSelected(item))    {      returntrue;    }    // Handle your other action bar items...returnsuper.onOptionsItemSelected(item);  }}
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  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:

24225611-bae8b45458c64f87b0cb05ac74ffd105  

  抽屉打开后:

24225655-1384a23f29f44b1689860aa167cb97cb  

 

 

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:

复制代码
<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.DrawerLayout    android:id="@+id/drawer_layout"    android:layout_width="match_parent"    android:layout_height="match_parent"><!-- The main content view --><FrameLayout      android:id="@+id/content_frame"      android:layout_width="match_parent"      android:layout_height="match_parent"><Button        android:id="@+id/btn"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="open"/></FrameLayout><!-- The navigation drawer --><ListView      android: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>
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  主要代码:

复制代码
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;publicclass DrawerActivity extends Activity{  private DrawerLayout mDrawerLayout = null;  @Override  protectedvoid 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()    {      @Override      publicvoid onClick(View v)      {        // 按钮按下,将抽屉打开        mDrawerLayout.openDrawer(Gravity.LEFT);      }    });  }}
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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

 

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