渐变笔触与透明背景
我试着去实现这样的事情,我在XML中使用图层列表中这样说:渐变笔触与透明背景
<item> <shape android:shape="rectangle" >
<gradient
android:centerColor="#4DD0E1"
android:endColor="#76FF03"
android:startColor="@color/colorPrimary"
android:type="linear" />
</shape>
</item>
<item
android:bottom="2dp"
android:left="2dp"
android:right="2dp"
android:top="2dp">
<shape android:shape="rectangle" >
<solid android:color="#fff" />
</shape>
</item>
这里是布局代码,边界的形状需要重叠图像。
<RelativeLayout android:layout_width="match_parent"
android:layout_height="100dp"
android:layout_marginTop="12dp"
android:background="@android:color/transparent">
<ImageView
android:layout_width="100dp"
android:layout_height="75dp"
android:layout_centerVertical="true"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_marginRight="12dp"
android:id="@+id/goals_image" />
<FrameLayout
android:id="@+id/goals_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:clickable="true"
android:layout_marginLeft="20dp"
android:layout_marginRight="32dp"
android:background="#00000000"
>
<TextView
android:id="@+id/goals_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="15dp"
android:text="Lose Weight"
android:textColor="@color/black"
android:layout_margin="40dp"
/>
</FrameLayout>
</RelativeLayout>
但如果我将背景设置为透明的形状背景变成了整个渐变颜色。我怎样才能实现具有透明背景的渐变描边?提前致谢。
回答:
只需使用一个8位颜色值,例如#FFF8F8F6,其中前两个字符是阿尔法值。 FF完全不透明,00完全透明。
入住这
How to make transparent gradient?
入住这也 http://www.coderzheaven.com/2013/02/04/create-transparency-image-android/
回答:
编辑检查这个
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" > <item>
<!-- create gradient you want to use with the angle you want to use -->
<shape android:shape="rectangle" >
<gradient
android:angle="0"
android:centerColor="@android:color/holo_blue_bright"
android:endColor="@android:color/holo_red_light"
android:startColor="@android:color/holo_green_light" />
</shape>
</item>
<!-- create the stroke for top, left, bottom and right with the dp you want -->
<item
android:bottom="2dp"
android:left="2dp"
android:right="2dp"
android:top="2dp">
<shape android:shape="rectangle" >
<!-- fill the inside in the color you want (could also be a gradient again if you want to, just change solid to gradient and enter angle, start, maybe center, and end color) -->
<solid android:color="#fff" />
</shape>
</item>
</layer-list>
回答:
后试试这个:
gradient_drawable.xml
<?xml version="1.0" encoding="utf-8"?> <layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="rectangle">
<gradient
android:centerColor="#4DD0E1"
android:endColor="#76FF03"
android:startColor="@color/colorPrimary"
android:type="linear" />
<corners android:radius="2dp" />
<padding
android:bottom="2dp"
android:left="2dp"
android:right="2dp"
android:top="2dp" />
</shape>
</item>
<item>
<shape android:shape="rectangle">
<solid android:color="@color/white" />
<corners android:radius="2dp" />
<size
android:width="50dp"
android:height="50dp" />
</shape>
</item>
</layer-list>
your_layout.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="100dp"
android:layout_marginTop="12dp"
android:background="@drawable/gradient_drawable">
<ImageView
android:id="@+id/goals_image"
android:layout_width="100dp"
android:layout_height="75dp"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginRight="12dp"
android:src="@mipmap/ic_launcher" />
<FrameLayout
android:id="@+id/goals_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:layout_marginLeft="20dp"
android:layout_marginRight="32dp"
android:background="#00000000"
android:clickable="true">
<TextView
android:id="@+id/goals_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="40dp"
android:text="Lose Weight"
android:textColor="@color/black"
android:textSize="15dp" />
</FrameLayout>
</RelativeLayout>
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