同一個(gè)產(chǎn)品經(jīng)理出品的App, Android端的界面往往比不上iOS端. Android端界面整體色彩渲染的不協(xié)調(diào), 一直受廣大用戶的詬病. Material Design的橫空出世, 讓Android端的使用者看到了希望--聲稱設(shè)計(jì)史上第一次超越了iOS端(作為一位iOS開發(fā)者,對此表示呵呵). 下面是Material Design實(shí)現(xiàn)的效果.

Material Design.gif

側(cè)面抽屜效果的彈出, 以及詳情界面頂部toolBar向上滾動(dòng)時(shí)的漸變, 效果有沒有很贊? 下面看一下具體實(shí)現(xiàn).

首先, 需要在app的build.gradle文件中添加Material Design的支持庫design, 其余的circleimageview, recyclerview, cardview, glide庫, 項(xiàng)目中都會(huì)用到.

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:26.+'
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    compile 'com.android.support:design:26.+'
    compile 'de.hdodenhof:circleimageview:2.1.0'
    compile 'com.android.support:recyclerview-v7:26.+'
    compile 'com.android.support:cardview-v7:26.+'
    compile 'com.github.bumptech.glide:glide:4.0.0'

    annotationProcessor 'com.github.bumptech.glide:compiler:4.0.0'
    testCompile 'junit:junit:4.12'
}

添加Toolbar

首先是將ActionBar替換成Toolbar,因?yàn)門oolbar才具有Materail Design效果. 修改路徑app/src/main/res/values下的styles文件.

<resources>
    //主題是淡色, 陪襯設(shè)置成深色;
    <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
        //主題是身色, 陪襯設(shè)置成淡色;
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

    <style name="FruitActivityTheme" parent="AppTheme"></style>
</resources>

將樣式改為Light.NoActionBar后,頂部的ActionBar就會(huì)被去掉. 然后在activity_main布局中添加Toolbar.

<android.support.v7.widget.Toolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="?attr/actionBarSize"
    android:background="?attr/colorPrimary"
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
    android:popupTheme="@style/ThemeOverlay.AppCompat.Light"
    app:title="Fruits"
    app:layout_scrollFlags="scroll|enterAlways|snap"
    ></android.support.v7.widget.Toolbar>

完成了以上工作, 就可以在MainActivity中使用了.

Toolbar toolbar = (Toolbar)findViewById(R.id.toolbar);
setSupportActionBar(toolbar);

ActionBar actionBar = getSupportActionBar();
if (actionBar != null){
    actionBar.setDisplayHomeAsUpEnabled(true);
    actionBar.setHomeAsUpIndicator(R.drawable.menu);
}

setDisplayHomeAsUpEnabled方法用來控制Toolbar頂部右邊是否顯示返回按鈕, setHomeAsUpIndicator方法可以給Toolbar設(shè)置圖片.

Toobar右邊的按鈕又是怎么添加的呢? res目錄下新建Directory, 命名為menu, 在該文件下新建文件toolbar.

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    >

    <item
        android:id="@+id/backup"
        android:title="Backup"
        android:icon="@drawable/left"
        app:showAsAction="always"
        android:visible="true"
        android:enabled="true"/>
    <item
        android:id="@+id/delete"
        android:title="Delete"
        android:icon="@drawable/right"
        app:showAsAction="ifRoom"/>
    <item
        android:id="@+id/settings"
        android:title="settings"
        android:icon="@drawable/left"
        app:showAsAction="never"/>
</menu>

新建的布局包含了backup, delete, settings三個(gè)按鈕. 其中showAsAction屬性分別設(shè)置成always, ifRoom, never. 屬性名稱已經(jīng)表明了界面效果.然后在MainActivity中的onCreateOptionsMenu方法中使用.

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
     super.onCreateOptionsMenu(menu);
     getMenuInflater().inflate(R.menu.toolbar, menu);
     return true;
 }

側(cè)拉抽屜效果

該效果可以通過Material Design中的DrawerLayout實(shí)現(xiàn).

<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >

    <android.support.design.widget.CoordinatorLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <android.support.design.widget.AppBarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

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

        <android.support.v4.widget.SwipeRefreshLayout
            android:id="@+id/swipe_refresh"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_behavior="@string/appbar_scrolling_view_behavior">

            <android.support.v7.widget.RecyclerView
                android:id="@+id/recycler_view"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                app:layout_behavior="@string/appbar_scrolling_view_behavior"></android.support.v7.widget.RecyclerView>
        </android.support.v4.widget.SwipeRefreshLayout>
        <android.support.design.widget.FloatingActionButton
            android:id="@+id/fab"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom|end"
            android:layout_margin="16dp"
            android:src="@drawable/newmsg"
            android:foregroundTint="#000"/>

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

    <android.support.design.widget.NavigationView
        android:id="@+id/nav_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#abc"
        app:menu="@menu/nav_menu"
        app:headerLayout="@layout/nav_header"
        android:layout_gravity="start"
        >

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

</android.support.v4.widget.DrawerLayout>

DrawerLayout底層封裝了一系列手勢識(shí)別的方法. 使用時(shí)內(nèi)部接收兩個(gè)控件, 第一個(gè)CoordinatorLayout是主頁面, 第二個(gè)NavigationView是側(cè)滑時(shí)出現(xiàn)的頁面.

CoordinatorLayout類似FrameLayout, 其內(nèi)部的控件都會(huì)以父布局的左上角為參照. 不同的是CoordinatorLayout符合Material Design的設(shè)計(jì)理念, 可以自動(dòng)識(shí)別CoordinatorLayout類型的控件并對它們進(jìn)行有效調(diào)整, 提供更好的用戶體驗(yàn). 上面的例子中, 因?yàn)锳ppBarLayout和FloatingActionButton都是CoordinatorLayout的子類, 可以保證Toolbar不被SwipeRefreshLayout遮擋, FloatingActionButton也不會(huì)隨著RecyclerView的上下滾動(dòng)而出現(xiàn)偏移. NavigationView是Material Design抽屜效果中推薦的側(cè)拉界面, 用于顯示詳情信息. 上面將名稱為nav_menu和nav_header的布局文件分別放在了布局中的menu和layout文件夾下, 具體實(shí)現(xiàn)如下.

<?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_call"
            android:icon="@drawable/left"
            android:title="call"/>
        <item
            android:id="@+id/nav_friends"
            android:icon="@drawable/right"
            android:title="friends"/>
        <item
            android:id="@+id/nav_location"
            android:icon="@drawable/left"
            android:title="location"/>
        <item
            android:id="@+id/nav_mail"
            android:icon="@drawable/right"
            android:title="mail"/>
    </group>
</menu>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:layout_height="180dp"
    android:padding="10dp"
    android:background="?attr/colorPrimary">

    <de.hdodenhof.circleimageview.CircleImageView
        android:id="@+id/icon_image"
        android:layout_width="70dp"
        android:layout_height="70dp"
        android:src="@drawable/aa"
        android:layout_centerInParent="true"/>
    <TextView
        android:id="@+id/mail"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:text="Dog's mail: dog10@163.com"
        android:textColor="#fff"
        android:textSize="14sp"/>

    <TextView
        android:id="@+id/username"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@id/mail"
        android:text="Dog Yellow"
        android:textColor="#fff"
        android:textSize="14sp"/>
</RelativeLayout>

完成以上布局, 就可以在MainActivity中處理相關(guān)邏輯了.

public class MainActivity extends AppCompatActivity {


    private DrawerLayout drawerLayout;

    private SwipeRefreshLayout swipeRefreshLayout;

    private Fruit[] fruits = {
            new Fruit("Apple", R.drawable.apple),
            new Fruit("banana", R.drawable.banana),
            new Fruit("berray", R.drawable.berray),
            new Fruit("tomato", R.drawable.tomato),
    };

    private List<Fruit> fruitList = new ArrayList<>();

    private FruitAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        swipeRefreshLayout = (SwipeRefreshLayout)findViewById(R.id.swipe_refresh);
        swipeRefreshLayout.setColorSchemeResources(R.color.colorPrimary);
        swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                refreshFruits();
            }
        });

        Toolbar toolbar = (Toolbar)findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        drawerLayout = (DrawerLayout)findViewById(R.id.drawer_layout);
        NavigationView navigationView = (NavigationView)findViewById(R.id.nav_view);

        ActionBar actionBar = getSupportActionBar();
        if (actionBar != null){

            actionBar.setDisplayHomeAsUpEnabled(true);
            actionBar.setHomeAsUpIndicator(R.drawable.menu);

        }
        navigationView.setCheckedItem(R.id.nav_call);
        navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener(){
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                drawerLayout.closeDrawers();
                return true;
            }
        });

        FloatingActionButton fab = (FloatingActionButton)findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
//                Toast.makeText(MainActivity.this, "fabs clicked!", Toast.LENGTH_SHORT).show();
                Snackbar.make(view, "Data deleted", Snackbar.LENGTH_SHORT).setAction("Undo", new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {
                        Toast.makeText(MainActivity.this, "Data restore", Toast.LENGTH_SHORT).show();
                    }
                }).show();
            }
        });

        initFruits();

        RecyclerView recyclerView = (RecyclerView)findViewById(R.id.recycler_view);
        GridLayoutManager layoutManager = new GridLayoutManager(this, 2);
        recyclerView.setLayoutManager(layoutManager);
        adapter = new FruitAdapter(fruitList);
        recyclerView.setAdapter(adapter);
    }

    private void refreshFruits(){
        new Thread(new Runnable() {
            @Override
            public void run() {
                try{
                    Thread.sleep(2000);
                }catch (InterruptedException e){
                    e.printStackTrace();
                }

                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        initFruits();
                        adapter.notifyDataSetChanged();
                        swipeRefreshLayout.setRefreshing(false);
                    }
                });
            }
        }).start();
    }

    private void initFruits(){
        fruitList.clear();
        for (int i = 0; i < 50; i++){
            Random random = new Random();
            int index = random.nextInt(fruits.length);
            fruitList.add(fruits[index]);
        }
    }

    //menu的item最多顯示2個(gè),屬性設(shè)置為never時(shí),被折疊不顯示.展開的大小是固定的.
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        getMenuInflater().inflate(R.menu.toolbar, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()){
            case android.R.id.home:
                drawerLayout.openDrawer(GravityCompat.START);
                break;
            case R.id.backup:
                Toast.makeText(this, "Back up", Toast.LENGTH_SHORT).show();
                break;
            case R.id.delete:
                Toast.makeText(this, "Delete", Toast.LENGTH_SHORT).show();
                break;
            case R.id.settings:
                Toast.makeText(this, "Setting", Toast.LENGTH_SHORT).show();
                break;
        }
        return true;
    }
}

其中Fruit實(shí)體類和FruitAdapter是RecyclerView正常顯示所需的java文件. 不明白的可以參照:ListView和RecyclerView

public class Fruit {
    private String name;

    private int imageId;

    public Fruit(String apple, int imageId) {
        this.name = apple;
        this.imageId = imageId;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getImageId() {
        return imageId;
    }

    public void setImageId(int imageId) {
        this.imageId = imageId;
    }
}

public class FruitAdapter extends RecyclerView.Adapter <FruitAdapter.ViewHolder>{

    static class ViewHolder extends RecyclerView.ViewHolder{

        CardView cardView;
        ImageView fruitImage;
        TextView fruitName;

        public ViewHolder(View view){
            super(view);

            cardView = (CardView)view;
            fruitImage = (ImageView)view.findViewById(R.id.fruit_image);
            fruitName = (TextView)view.findViewById(R.id.fruit_name);
        }
    }

    private List<Fruit> mFruits;
    private Context mContext;

    public FruitAdapter(List<Fruit> fruits){
        mFruits = fruits;
    }
    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        if (mContext == null){
            mContext = parent.getContext();
        }

        View view = LayoutInflater.from(mContext).inflate(R.layout.fruit_item, parent, false);

        final  ViewHolder holder = new ViewHolder(view);
        holder.cardView.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View view) {

                int position = holder.getAdapterPosition();
                Fruit fruit = mFruits.get(position);
                Intent intent = new Intent(mContext, FruitActivity.class);
                intent.putExtra(FruitActivity.FRUIT_NAME, fruit.getName());
                intent.putExtra(FruitActivity.FRUIT_IMAGE_ID, fruit.getImageId());
                mContext.startActivity(intent);
            }
        });
        return holder;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        Fruit fruit = mFruits.get(position);
        holder.fruitName.setText(fruit.getName());
        Glide.with(mContext).load(fruit.getImageId()).into(holder.fruitImage);
    }

    @Override
    public int getItemCount() {
        return mFruits.size();
    }
}

RecycleView中的單元控件使用了Material Design中的CardView, 包含ImageView和TextView兩個(gè)控件.

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

<android.support.v7.widget.CardView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"

    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_margin="5dp"
    app:cardCornerRadius="4dp">
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <ImageView
            android:id="@+id/fruit_image"
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:scaleType="centerCrop"/>

        <TextView
            android:id="@+id/fruit_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:layout_margin="5dp"
            android:textSize="12sp"
            />
    </LinearLayout>

</android.support.v7.widget.CardView>

設(shè)置CardView中的Image時(shí)使用了Glide, 可以結(jié)合設(shè)備屏幕分辨率對圖片的清晰度自動(dòng)調(diào)整, 保證相對較好的渲染效果. 使用前需要導(dǎo)入相應(yīng)的庫, 具體設(shè)置可以參照文章開頭.

Fruit詳情頁面

在FruitAdapter中給ViewHolder添加點(diǎn)擊方法, 點(diǎn)擊CardView的item后, 跳轉(zhuǎn)到FruitActivity頁面, 其布局文件如下:

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

<android.support.design.widget.CoordinatorLayout
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:fitsSystemWindows="true">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appBar"
        android:layout_width="match_parent"
        android:layout_height="250dp"
        android:fitsSystemWindows="true">

        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/collapsing_toolbar"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
            app:contentScrim="?attr/colorPrimary"
            app:layout_scrollFlags="scroll|exitUntilCollapsed"
            android:fitsSystemWindows="true"
            >
            
            <ImageView
                android:id="@+id/fruit_image_view"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:scaleType="centerCrop"
                app:layout_collapseMode="parallax"
                android:fitsSystemWindows="true"/>
            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                app:layout_collapseMode="pin"
                ></android.support.v7.widget.Toolbar>
        </android.support.design.widget.CollapsingToolbarLayout>
    </android.support.design.widget.AppBarLayout>

    <android.support.v4.widget.NestedScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <LinearLayout
            android:orientation="vertical"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <android.support.v7.widget.CardView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="15dp"
                android:layout_marginLeft="15dp"
                android:layout_marginRight="15dp"
                android:layout_marginTop="35dp"
                app:cardCornerRadius="4dp"></android.support.v7.widget.CardView>
            
                <TextView
                    android:id="@+id/fruit_content_text"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_margin="10dp"/>

        </LinearLayout>
    </android.support.v4.widget.NestedScrollView>

    <android.support.design.widget.FloatingActionButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="16dp"
        android:src="@drawable/left"
        app:layout_anchor="@id/appBar"
        app:layout_anchorGravity="bottom|end"/>
</android.support.design.widget.CoordinatorLayout>

該頁面包含3部分: 上面的AppBarLayout, 下面的NestedScrollView, 以及懸浮在頁面的FloatingActionButton. 最后的FloatingActionButton的錨點(diǎn)依托在AppBarLayout的右下部.

使用CollapsingToolbarLayout可以實(shí)現(xiàn)隨著ScrollView滾動(dòng)的效果. 設(shè)置為layout_scrollFlags屬性為'scroll|exitUntilCollapsed'后, CollapsingToolbarLayout就能根據(jù)ScrollView向上滾動(dòng)的距離來決定內(nèi)部控件的顯示或者隱藏.為了滿足Material Design設(shè)計(jì), 需要將布局放在AppBarLayout當(dāng)中.

Material Design當(dāng)中允許修改頂部狀態(tài)欄. 首先將符合CoordinatorLayout的父布局和子布局的fitsSystemWindows屬性全部設(shè)置成true. 然后修改AppTheme為透明色. 由于Material Design是在Android5.0推出, 所以需要在res文件夾下新建目錄values-v21對Android的不同版本進(jìn)行適配. 在values-v21目錄下新建styles.xml文件, 內(nèi)容如下.

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

    <style name="FruitActivityTheme" parent="AppTheme">
        <item name="android:statusBarColor">@android:color/transparent</item>
    </style>
</resources>

NestedScrollView是符合Material Design標(biāo)準(zhǔn)的ScrollView, 使用方式也比較類似. 有了布局就可以在FruitActivity添加處理邏輯.

public class FruitActivity extends AppCompatActivity {


    public static final String FRUIT_NAME = "fruit_name";

    public static final String FRUIT_IMAGE_ID = "fruit_image_id";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_fruit);

        Intent intent = getIntent();
        String fruitName = intent.getStringExtra(FRUIT_NAME);
        int fruitImageId = intent.getIntExtra(FRUIT_IMAGE_ID, 0);
        Toolbar toolbar = (Toolbar)findViewById(R.id.toolbar);
        CollapsingToolbarLayout collapsingToolbarLayout = (CollapsingToolbarLayout)findViewById(R.id.collapsing_toolbar);
        ImageView fruitImageView = (ImageView)findViewById(R.id.fruit_image_view);
        TextView fruitContextText = (TextView)findViewById(R.id.fruit_content_text);
        setSupportActionBar(toolbar);
        ActionBar actionBar = getSupportActionBar();
        if (actionBar != null){
            actionBar.setDisplayHomeAsUpEnabled(true);
        }
        collapsingToolbarLayout.setTitle(fruitName);
        Glide.with(this).load(fruitImageId).into(fruitImageView);
        String fruitContent = generateFruitContent(fruitName);
        fruitContextText.setText(fruitContent);
    }

    private String generateFruitContent(String fruitName){
        StringBuilder fruitContent = new StringBuilder();
        for (int i = 0; i < 500; i++){
            fruitContent.append(fruitName);
        }
        return fruitContent.toString();
    }

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

總結(jié)

Material Design是Android為了增強(qiáng)UI設(shè)計(jì)效果和提高用戶體驗(yàn)而推薦的標(biāo)準(zhǔn), 背后是統(tǒng)一的設(shè)計(jì)理念, 為標(biāo)準(zhǔn)繁多的Android界面設(shè)計(jì)吹來了一股清風(fēng). 上面的例子中利用Material Design中推出的組件替換了App的ActionBar為Toolbar,利用DrawerLayout實(shí)現(xiàn)了抽屜效果,并且在Fruit的詳情頁面,利用CollapsingToolbarLayout實(shí)現(xiàn)了Toolbar隨NestedScrollView滾動(dòng)而變化. 相信經(jīng)過以上實(shí)踐, 能夠?qū)aterial Design的理解能夠更加深入. 也希望在App的開發(fā)中能夠踐行Material Design的設(shè)計(jì)理念.

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