Android6.0之行为分析

AppBarLayout的简单使用

AppBarLayout将应用中的Toolbar和TabLayout放在了一起

    <?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    android:orientation="vertical"
    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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.javahe.tablayout_design_demo.MainActivity">
    <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="@color/colorAccent"
            app:layout_scrollFlags="scroll|enterAlways|snap"
            app:title="努力奋斗"></android.support.v7.widget.Toolbar>
        <android.support.design.widget.TabLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/tab"
            app:tabBackground="@color/colorAccent"
            app:tabSelectedTextColor="#a228c7"
            app:tabTextColor="#fff"
            app:tabIndicatorColor="#45dd17"
            app:tabIndicatorHeight="3dp"
            >
        </android.support.design.widget.TabLayout>
    </android.support.design.widget.AppBarLayout>
    <android.support.v4.view.ViewPager
        android:id="@+id/vp"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        //关键是Layout_bahavior的声明
        app:layout_behavior="@string/appbar_scrolling_view_behavior">
    </android.support.v4.view.ViewPager>
</android.support.design.widget.CoordinatorLayout>

当AppBarLayout中，上面的元素不能滚动的时候，下面的元素依然也是不能滚动的。

能够实现相同效果的，还有RecyclerView和NestedScrollView

ScrollFlags还有两个属性 exitUtilsCollaped，EnterAlwaysCollapased

沉浸式状态栏

通过xml来实现

在最外层布局添加

 android:fitsSystemWindows="true"

设置主题

<Item name="android:windowsDrawsSystemBarBackgrounds">true</Item>
<Item name="android:statusBarColor">@android:color/transparent</Item>

通过代码实现

getWindow().setStatusBarColor(Color.TRANSPARENT);

实现半透明状态栏的办法

getWindow.addFlag(WindowManager.LayoutParams.FLAG_TRANLUCENT_STAUS);

CollapsingAppBarLayout

    <?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:layout_width="match_parent"
    android:fitsSystemWindows="true"
    android:layout_height="match_parent"
    tools:context="com.javahe.collapsingappbarlayout.MainActivity">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        >
        <android.support.design.widget.CollapsingToolbarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_scrollFlags="scroll|exitUntilCollapsed"
           // 覆盖内容的颜色
           app:contentScrim="@color/colorPrimary">
            <ImageView
                android:layout_width="match_parent"
                android:layout_height="200dp"
                android:src="@drawable/cheese_1"
                android:fitsSystemWindows="true"
                android:scaleType="centerCrop"
                app:layout_collapseMode="parallax"
                />
            <android.support.v7.widget.Toolbar
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                app:title="努力加油">

            </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">
        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="@string/app_name1"/>
    </android.support.v4.widget.NestedScrollView>

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