如何让ImageView生效
How to give effect to ImageView
预期:
我想在 ImageView
的顶部产生类似黑色阴影的效果,仅在顶部。我试过为 ImageView
的背景创建一个形状,如下所示:
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="rectangle">
<solid android:color="@color/black_1_50"/>
<!--shadow Color-->
</shape>
</item>
<item
android:left="0dp"
android:right="0dp"
android:top="20dp"
android:bottom="0dp">
<shape android:shape="oval">
<solid android:color="@color/white_1_60"/>
</shape>
</item>
</layer-list>
但是没用。有什么解决办法吗?
您的activity或片段
的布局
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="@drawable/ic_launcher_background"
android:adjustViewBounds="true" />
<View
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/shadoweffects" />
</FrameLayout>
可绘制shadoweffects.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<gradient
android:angle="90"
android:endColor="#aa000000"
android:startColor="#00ffffff"
android:centerColor="#00ffffff" />
</shape>
根据要求更改颜色
预期:
我想在 ImageView
的顶部产生类似黑色阴影的效果,仅在顶部。我试过为 ImageView
的背景创建一个形状,如下所示:
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="rectangle">
<solid android:color="@color/black_1_50"/>
<!--shadow Color-->
</shape>
</item>
<item
android:left="0dp"
android:right="0dp"
android:top="20dp"
android:bottom="0dp">
<shape android:shape="oval">
<solid android:color="@color/white_1_60"/>
</shape>
</item>
</layer-list>
但是没用。有什么解决办法吗?
您的activity或片段
的布局<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="@drawable/ic_launcher_background"
android:adjustViewBounds="true" />
<View
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/shadoweffects" />
</FrameLayout>
可绘制shadoweffects.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<gradient
android:angle="90"
android:endColor="#aa000000"
android:startColor="#00ffffff"
android:centerColor="#00ffffff" />
</shape>
根据要求更改颜色