如何向嵌套在 CollapsingToolbar 中的 ImageView 添加渐变 [英] How to add a gradient to a ImageView nested in a CollapsingToolbar
问题描述
我正在开发具有 Material Design 的 Android 应用.我有一个带有 CollapsingToolbarLayout 和 ImageView 的详细视图(到目前为止工作正常).不幸的是,如果有明亮的图像,则标题不可读.到目前为止,我尝试添加渐变(向 imageview 添加渐变),但此解决方案没有由于 CollapsingToolbarLayout 为我工作.在这里你可以看到我的代码:
I'am working on an Android app with material design. I have a detail view with a CollapsingToolbarLayout and a ImageView (works fine so far). Unfortunately the title is not readable if there is a bright image. So far I tried to add a gradient (Add gradient to imageview) but this solution didn't work for me because of the CollapsingToolbarLayout. Here you can see my code:
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<android.support.design.widget.AppBarLayout
android:layout_height="256dp"
android:layout_width="match_parent"
android:fitsSystemWindows="true"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.design.widget.CollapsingToolbarLayout
android:id="@+id/collapsing_toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
app:contentScrim="@color/primary"
android:fitsSystemWindows="true"
app:expandedTitleMarginEnd="50dp"
app:expandedTitleMarginStart="50dp"
>
<!--<View
android:background="@drawable/actionbar_gradient_dark"
/>-->
<ImageView
android:id="@+id/backimg"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
app:layout_collapseMode="parallax"
android:scaleType="centerCrop"
app:layout_scrollFlags="scroll|enterAlways"
/>
<android.support.v7.widget.Toolbar
android:id="@+id/detailToolbar"
android:layout_height="?attr/actionBarSize"
android:layout_width="match_parent"
app:layout_collapseMode="pin"
app:layout_collapseParallaxMultiplier="0.7"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light"/>
</android.support.design.widget.CollapsingToolbarLayout>
有人知道这个问题的解决方案吗?
Does anyone know a solution for this issue?
推荐答案
将你的 ImageView 包裹在一个 FrameLayout 中并添加一个带有背景的 View:
Wrap your ImageView in a FrameLayout and add a View with a background:
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/backimg"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
app:layout_collapseMode="parallax"
android:scaleType="centerCrop"
android:src="@drawable/image"
app:layout_scrollFlags="scroll|enterAlways" />
<View
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/actionbar_gradient_dark" />
</FrameLayout>
确保你的渐变是这样的:
Make sure your gradient is something like this:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" >
<gradient
android:angle="90"
android:endColor="@android:color/transparent"
android:startColor="@android:color/black" />
<corners android:radius="0dp" />
</shape>
这篇关于如何向嵌套在 CollapsingToolbar 中的 ImageView 添加渐变的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!