Android 为图像视图添加渐变

Add gradient to imageview

提问by user1163234

I want to add a gradient on the bottom of my image . Something like this :

我想在我的图像底部添加一个渐变。像这样的事情：

I tried something like this but I only get the gradient no image..

我试过这样的东西，但我只得到渐变没有图像..

    <ImageView
    android:id="@+id/trendingImageView"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:background="@drawable/trend_donald_sterling"
    android:src="@drawable/trending_gradient_shape"
  />

trending_gradient_shape:

Trending_gradient_shape:

<shape xmlns:android="http://schemas.android.com/apk/res/android"
       android:shape="rectangle" >

    <gradient
        android:angle="90"
        android:endColor="@android:color/darker_gray"
        android:startColor="@android:color/darker_gray" />

    <corners android:radius="0dp" />

</shape>

回答by nhaarman

You need two layers: An ImageView, and a Viewon top of that with your gradient as android:background. Put these two Views in a FrameLayout:

您需要两层： AnImageView和 aView在您的渐变为 之上android:background。将这两个View放在 a 中FrameLayout：

<FrameLayout
    ... >

    <ImageView
        ...
        android:src="@drawable/trend_donald_sterling" />

    <View
        ...
        android:background="@drawable/trending_gradient_shape"/>


</FrameLayout>

回答by Kaustuv

Simply set the alpha value in your gardient.xml:

只需在您的 gardient.xml 中设置 alpha 值：

Your imageView:

您的图像视图：

android:background="@drawable/trend_donald_sterling"
android:src="@drawable/trending_gradient_shape"

Your gradient xml file:

您的渐变 xml 文件：

<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" >

<gradient
    android:angle="90"
    android:endColor="#00ffffff"
    android:startColor="#aa000000"
    android:centerColor="#00ffffff" />

<corners android:radius="0dp" />
</shape>

In the color value, the first two places after # correspond to the alpha value, while the rest are the actual color value in R G B format, two for each.

在颜色值中，#后面的前两位对应的是alpha值，其余的都是RGB格式的实际颜色值，各两个。

回答by swetabh suman

try using the "foreground" attribute in your imageview

尝试在图像视图中使用“前景”属性

<ImageView
        ...
        android:src="@drawable/trend_donald_sterling"
        android:foreground="@drawable/trending_gradient_shape" />

it worked for me.

它对我有用。

回答by Slick Slime

Use android:foreground="..."instead of android:background="..."

使用android:foreground="..."代替android:background="..."

Now you won't need to put ImageView and View inside a FrameLayout!

现在您不需要将 ImageView 和 View 放在 FrameLayout 中！

So your final code will be:

所以你的最终代码将是：

ImageView

图像视图

<ImageView
    ...
    android:foreground="@drawable/trend_donald_sterling"/>

Drawable

可绘制

<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >

    <gradient
        android:angle="90"
        android:endColor="#00ffffff"
        android:startColor="#aa000000"
        android:centerColor="#00ffffff" />

    <corners android:radius="0dp" />
</shape>

回答by Ashana.Hymanol

this is how im gonna do, i used relative layout as my parent layout, use the following code

这就是我要做的，我使用相对布局作为我的父布局，使用以下代码

 <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <ImageView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scaleType="centerCrop"
            android:src="@drawable/img_sample"/>
        <View
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@drawable/gradiant"/>
        <LinearLayout
            android:layout_marginLeft="10dp"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            android:weightSum="1">
            <View
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="0.55"/>
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="0dp"
                android:layout_weight="0.25"
                android:text="Events"
                android:gravity="bottom"
                android:textStyle="bold"
                android:textSize="18sp"
                android:textColor="#ffffff"/>
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="0dp"
                android:layout_weight="0.25"
                android:text="Some description about the events goes here"
                android:textSize="14sp"
                android:textColor="#ffffff"/>
        </LinearLayout>
    </RelativeLayout>

hope you can figure out, here i attach my gradiant code below.use it inside the drawable folder....

希望你能弄清楚，我在下面附上我的渐变代码。在 drawable 文件夹中使用它....

<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" >

<gradient
    android:angle="90"
    android:endColor="#00ffffff"
    android:startColor="#aa000000"
    android:centerColor="#00ffffff" />

<corners android:radius="0dp" />
</shape>