可折叠的ToolBar+抽屉菜单NavigationView+浮动按钮FloatButton

使用Material Design风格的ToolBar和抽屉导航

先看个简单的运行效果

主要记录下布局的写法

---

1 用到的Google Design依赖和V7包依赖

compile 'com.android.support:cardview-v7:25.0.0'
compile 'com.android.support:recyclerview-v7:25.0.0'
compile 'com.android.support:design:25.0.0'
compile 'com.android.support:appcompat-v7:25.0.0'

2 主布局结构

3 主布局内容

<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_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <!--CoordinatorLayout 布局属性:FrameLayout-->
        <android.support.design.widget.CoordinatorLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <!--AppBar  布局属性:LinearLayout 默认子元素垂直排列-->
            <android.support.design.widget.AppBarLayout
                android:id="@+id/appbar"
                android:layout_width="match_parent"
                android:layout_height="200dp"
                android:fitsSystemWindows="true">

                <!--提供了一个可以折叠的Toolbar 布局属性:FrameLayout-->
                <android.support.design.widget.CollapsingToolbarLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    app:layout_scrollFlags="scroll|exitUntilCollapsed">

                    <View
                        android:layout_width="match_parent"
                        android:layout_height="match_parent"
                        android:background="@color/colorPrimary"
                        app:layout_collapseMode="parallax"
                        app:layout_collapseParallaxMultiplier="0.5" />

                    <android.support.v7.widget.Toolbar
                        android:id="@+id/toolbar"
                        android:layout_width="match_parent"
                        android:layout_height="?android:attr/actionBarSize"
                        app:contentInsetStart="0dp"
                        app:layout_collapseMode="pin"
                        app:title="@string/app_name" />

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

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

            <android.support.v7.widget.RecyclerView
                android:id="@+id/recycler"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="@color/divider"
                app:layout_behavior="@string/appbar_scrolling_view_behavior" />

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

        <!--Float Button-->
        <android.support.design.widget.FloatingActionButton
            android:id="@+id/float_btn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom|end"
            android:layout_marginBottom="10dp"
            android:layout_marginEnd="10dp"
            android:src="@drawable/ic_action_important"
            app:elevation="10dp" />

    </FrameLayout>

    <!--左侧抽屉-->
    <android.support.design.widget.NavigationView
        android:id="@+id/navigation"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        app:headerLayout="@layout/layout_navigation_header_main"
        app:menu="@menu/main_navigation">

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

4 抽屉导航头布局内容 (layout_navigation_header_main.xml)

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="200dp"
    android:background="@color/colorAccent">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:drawablePadding="5dp"
        android:drawableStart="@mipmap/ic_launcher"
        android:gravity="center"
        android:text="@string/hello"
        android:textColor="@color/icons"
        android:textSize="20sp" />
</FrameLayout>

5 界面逻辑很简单，给RecyclerView绑定数据，抽屉菜单的打开关闭(MainActivity内容)

public class MainActivity extends AppCompatActivity {
    private final String[] data = {"Hello,Word!",
            "Hello,Android!", "Hello,Material design!",
            "Hello,Word!", "Hello,Android!", "Hello,Material design!",
            "Hello,Word!", "Hello,Android!", "Hello,Material design!",
            "Hello,Word!", "Hello,Android!", "Hello,Material design!",
            "Hello,Word!", "Hello,Android!", "Hello,Material design!"};

    private FloatingActionButton floatBtn;
    private DrawerLayout drawerLayout;

    @Override
    protected void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        //设置ToolBar作为ActionBar
        setSupportActionBar(toolbar);
        ActionBar actionBar = getSupportActionBar();
        if (actionBar != null) {
            //设置ActionBar左上角按钮
            actionBar.setHomeAsUpIndicator(R.drawable.ic_nav);
            actionBar.setDisplayHomeAsUpEnabled(true);
        }
        drawerLayout = (DrawerLayout) findViewById(R.id.drawer_main);
        floatBtn = (FloatingActionButton) findViewById(R.id.float_btn);
        floatBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(MainActivity.this, "Float Button", Toast.LENGTH_SHORT).show();
            }
        });

        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler);
        MyAdapter myAdapter = new MyAdapter();
        recyclerView.setAdapter(myAdapter);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater menuInflater = getMenuInflater();
        menuInflater.inflate(R.menu.main_menu, menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                if (drawerLayout.isDrawerOpen(GravityCompat.START)) {
                    drawerLayout.closeDrawers();
                } else {
                    drawerLayout.openDrawer(GravityCompat.START);
                }
                break;
            case R.id.menu_1:
                Toast.makeText(MainActivity.this, item.getTitle(), Toast.LENGTH_SHORT).show();
                break;
        }
        return super.onOptionsItemSelected(item);
    }

    private class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {

        class ViewHolder extends RecyclerView.ViewHolder {
            private TextView tv;

            ViewHolder(View itemView) {
                super(itemView);
                tv = (TextView) itemView.findViewById(R.id.tv);
            }

        }

        @Override
        public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_list, parent, false);
            return new ViewHolder(view);
        }

        @Override
        public void onBindViewHolder(ViewHolder holder, int position) {
            holder.tv.setText(data[holder.getAdapterPosition()]);
        }

        @Override
        public int getItemCount() {
            return data.length;
        }
    }
}

6 总结

1. Google提供的抽屉菜单(NavigationView)确实方便了许多，可以直接通过设置Menu资源作为抽屉菜单的菜单项，可以直接设置layout作为抽屉菜单的头部
2. 可折叠的ToolBar
   
   (**CoordinatorLayout + AppBarLayout + CollapsingToolbarLayout + Toolbar **)使嵌套滚动的实现变得容易
3. 浮动按钮(FloatActionButton)也是方便了实现material design风格

源码虽简，还是也放到GitHub上了^_