Draw triangle background in android

问题

I need to draw a background of layout as a triangle, like you can see in the picture.

I've found an example where they do something similar, but I don't know how to adapt it to my case. Here is the example

Can anyone help me? Best.

回答1:

Here is an example of a drawable resource with a triangle in the right bottom corner in front of an image. As the image I used the default android launcher icon. You can use any other image.

Create triangle.xml file in res/drawable like this:

<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item
    android:drawable="@drawable/ic_launcher">
</item>
<item>
    <rotate
        android:fromDegrees="-45"
        android:toDegrees="0"
        android:pivotX="150%"
        android:pivotY="20%" >
        <shape
            android:shape="rectangle" >
            <solid android:color="#ff0000" />
        </shape>
    </rotate>
</item>
</layer-list>

Then use it as background attribute of a view:

android:background="@drawable/triangle"

来源：https://stackoverflow.com/questions/23080934/draw-triangle-background-in-android