android - 抽屉导航标题中的淡入淡出效果

Question

我一直在开发一个需要包含抽屉导航和底部导航的应用程序。

我按照 androidhive 教程编写了如下代码。

appbarhome.xml

    <?xml version="1.0" encoding="utf-8"?>
    <android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fitsSystemWindows="true"
        tools:context="com.app.standardcoldpressoil.Activity.HomeActivity">

        <include layout="@layout/content_home" />

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

content_home.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="com.app.standardcoldpressoil.Activity.HomeActivity"
    tools:showIn="@layout/app_bar_home">

    <android.support.design.widget.BottomNavigationView
        android:id="@+id/navigation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_gravity="bottom"
        android:background="?android:attr/windowBackground"
        android:foreground="?attr/selectableItemBackground"
        app:itemBackground="@color/colorPrimary"
        app:itemIconTint="@android:color/white"
        app:itemTextColor="@android:color/white"
        app:menu="@menu/navigation" />

</RelativeLayout>

activity_home.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout 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/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="false"
    tools:openDrawer="start">

    <include
        layout="@layout/app_bar_home"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <android.support.design.widget.NavigationView
        android:id="@+id/nav_view"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:layout_marginTop="?attr/actionBarSize"
        android:fitsSystemWindows="true"
        app:headerLayout="@layout/nav_header_home"
        app:menu="@menu/activity_main_drawer" />

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

但是我的导航标题褪色了。我已附上我的屏幕截图。

我需要操作栏来显示 fragment 名称，因此我在 Activity 中添加了代码，例如，

ActionBar toolbar;
 toolbar = getSupportActionBar();
        toolbar.setDisplayHomeAsUpEnabled(true);
        toolbar.setHomeButtonEnabled(true);

      /*  BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);
        navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);*/

        toolbar.setTitle("Shop");

任何帮助将不胜感激。这将有助于我更好地理解!

nav_header_home.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="@dimen/nav_header_height"
    android:background="@drawable/side_nav_bar"
    android:gravity="bottom"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:theme="@style/ThemeOverlay.AppCompat.Dark">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:paddingTop="@dimen/nav_header_vertical_spacing"
        android:src="@drawable/app_logo" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingTop="@dimen/nav_header_vertical_spacing"
        android:text="Welcome Ram"
        android:textAppearance="@style/TextAppearance.AppCompat.Body1"
        android:textColor="@color/colorPrimaryDark" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="3f4d5e52555e467f58525e5653115c5052" rel="noreferrer noopener nofollow">[email protected]</a>"
        android:textColor="@color/colorPrimaryDark" />

</LinearLayout>

Answer 1

褪色的间隙是由于 android:fitsSystemWindows 属性造成的，系统正在尝试根据该属性来补偿以适应 DrawerLayout。为了消除间隙，您需要做的就是在 android:fitsSystemWindows="true" 中将 android.support.v4.widget.DrawerLayout 替换为 activity_home.xml，并在同一 xml 中将 android:fitsSystemWindows="false" 更改为您的 android.support.design.widget.NavigationView。

你的新activity_home.xml应该是这样的:

---

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout 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/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true" 
    tools:openDrawer="start">

    <include
        layout="@layout/app_bar_home"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <android.support.design.widget.NavigationView
        android:id="@+id/nav_view"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:layout_marginTop="?attr/actionBarSize"
        android:fitsSystemWindows="false"
        app:headerLayout="@layout/nav_header_home"
        app:menu="@menu/activity_main_drawer" />

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

---

这应该消除间隙。享受..