Android Design Support Library（二）用NavigationView实现抽屉菜单界面

NavigationView在MD设计中很重要，之前Google也提出了使用DrawerLayout来实现导航抽屉。

这次，在Android Design Support Library中，Google提供了NavigationView来实现导航菜单界面。

这次我们写的代码在Android用TabLayout实现相似网易选项卡动态滑动效果这篇文章代码的基础上进行改动，所以最好先看看上面这篇文章

首先仍旧是配置build.gradle：

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:22.2.0'
    compile 'com.android.support:design:22.2.0'
    compile 'com.android.support:recyclerview-v7:22.2.0'
    compile 'com.android.support:cardview-v7:22.2.0'
}

‘com.android.support:design:22.2.0’com.android.support:design:22.2.0就是我们须要引入的Android Design Support Library，其次我们还引入了Recyclerview和Cardview。

主界面布局（activity_tab_layout.xml）

<?xml version="1.0" encoding="utf-8"?>

<android.support.v4.widget.DrawerLayout
    android:id="@+id/dl_main_drawer"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".TabLayoutActivity"
    android:orientation="vertical">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            app:layout_scrollFlags="scroll|enterAlways"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light"/>

        <android.support.design.widget.TabLayout
            android:id="@+id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:tabIndicatorColor="#ADBE107E"
            app:tabMode="scrollable"/>

        </android.support.design.widget.AppBarLayout>

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"/>

</LinearLayout>

    <android.support.design.widget.NavigationView
        android:id="@+id/nv_main_navigation"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        app:headerLayout="@layout/navigation_header"
        app:menu="@menu/drawer_view"/>
</android.support.v4.widget.DrawerLayout>

DrawerLayout标签包括了主界面的布局以及抽屉的布局。NavigationView标签下app:headerLayout=”” 能够引入头部文件
app:menu=”“则引入菜单的布局。

头部布局文件（navigation_header.xml）

<?
xml version="1.0" encoding="utf-8"?
>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="150dp"
              android:background="?attr/colorPrimaryDark"
              android:orientation="horizontal"
              android:theme="@style/ThemeOverlay.AppCompat.Dark">

    <ImageView
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_gravity="center_vertical"
        android:layout_marginLeft="50dp"
        android:background="@drawable/ic_user"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp"
        android:layout_gravity="center_vertical"
        android:text="Liuwangshu"
        android:textAppearance="@style/TextAppearance.AppCompat.Body1"
        android:textSize="20sp"/>

</LinearLayout>

菜单布局文件（drawer_view.xml）

<?xml version="1.0" encoding="utf-8"?>

<menu xmlns:android="http://schemas.android.com/apk/res/android">

    <group android:checkableBehavior="single">
        <item
            android:id="@+id/nav_home"
            android:icon="@drawable/ic_dashboard"
            android:title="首页"/>
        <item
            android:id="@+id/nav_messages"
            android:icon="@drawable/ic_event"
            android:title="事项"/>
        <item
            android:id="@+id/nav_friends"
            android:icon="@drawable/ic_headset"
            android:title="音乐"/>
        <item
            android:id="@+id/nav_discussion"
            android:icon="@drawable/ic_forum"
            android:title="消息"/>
    </group>

    <item android:title="其它">
        <menu>
            <item
                android:icon="@drawable/ic_dashboard"
                android:title="设置"/>
            <item
                android:icon="@drawable/ic_dashboard"
                android:title="关于我们"/>
        </menu>
    </item>

</menu>

来看看主界面的java代码（TabLayoutActivity.java）

package com.example.liuwangshu.mytablayout;
import android.support.design.widget.NavigationView;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.view.GravityCompat;
import android.support.v4.view.ViewPager;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;

import java.util.ArrayList;
import java.util.List;

public class TabLayoutActivity extends AppCompatActivity {
    private DrawerLayout mDrawerLayout;
    private ViewPager mViewPager;
    private TabLayout mTabLayout;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_tab_layout);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        final ActionBar ab = getSupportActionBar();
        ab.setHomeAsUpIndicator(R.drawable.ic_menu);
        ab.setDisplayHomeAsUpEnabled(true);
        mViewPager = (ViewPager) findViewById(R.id.viewpager);
        mDrawerLayout = (DrawerLayout) findViewById(R.id.dl_main_drawer);
        NavigationView navigationView =
                (NavigationView) findViewById(R.id.nv_main_navigation);
        if (navigationView != null) {
            navigationView.setNavigationItemSelectedListener(
                    new NavigationView.OnNavigationItemSelectedListener() {
                        @Override
                        public boolean onNavigationItemSelected(MenuItem menuItem) {
                            menuItem.setChecked(true);
                            mDrawerLayout.closeDrawers();
                            return true;
                        }
                    });
        }
        initViewPager();
    }

navigationView.setNavigationItemSelectedListener对菜单的条目进行了监听。假设被点击则将条目设置为选中状态并收回抽屉。当然别忘了对toolbar的菜单选项进行监听回调，否则抽屉就出不来了。

（TabLayoutActivity.java）

  @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                mDrawerLayout.openDrawer(GravityCompat.START);
                return true;
        }
        return super.onOptionsItemSelected(item);
    }

最后执行程序来看看效果

github源代码下载