CoordinatorLayout 之 AppBarLayout

實現效果：

隨着屏幕的滾動，Toolbar收縮

需要的庫：

compile 'com.android.support:design:23.1.1'

需要使用的組件：

1. android.support.design.widget.CoordinatorLayout
2. android.support.design.widget.AppBarLayout
3. android.support.design.widget.CollapsingToolbarLayout
4. android.support.v7.widget.Toolbar
5. android.support.v4.widget.NestedScrollView

實現代碼：

xml部分：

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="software.monster.myapplication.MainActivity">
    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="200dp">
        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/toolbarlayout"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@color/colorAccent"
            app:layout_scrollFlags="scroll|exitUntilCollapsed">

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="#77db93"
                android:minHeight="20dp"
                android:popupTheme="@style/ThemeOverlay.AppCompat.Light"
                android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
                app:logo="@mipmap/ic_launcher"
                app:title="Hello zzp!" />

        </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:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentEnd="true"
            android:layout_below="@+id/toolbar"
            android:orientation="vertical">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Hello World!\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Hello World!\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Hello World!\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Hello World!\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Hello World!\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123\n123" />
        </LinearLayout>
    </android.support.v4.widget.NestedScrollView>

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

java部分：

使用setSupprotActionBar()將原本的ActionBar替換掉。

public class MainActivity extends AppCompatActivity {
    private FloatingActionButton btn;
    private Toolbar toolbar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initViews();
        init();
    }


    private void initViews() {
        toolbar  = (Toolbar) findViewById(R.id.toolbar);
    }
    private void init(){
        setSupportActionBar(toolbar);
    }


}

 補充：

若需要添加背景圖片，只需將ImageView放到內CollapsingToolbarLayout即可，

注意要放到Toolbar之上，否則會擋住Toolbar。若要Toolbar位置的也像是ImageView

則僅需將Toolbar的background屬性刪除掉即可。