android - adding gradient colour to button background in android

Question

I have a gradient background with code:

<Button android:id="@+id/btn_signup"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="Login"
            android:background="@drawable/sel_btn_background"
            android:gravity="center"
            android:textSize="16sp"
            android:layout_marginTop="40dp"
            android:textColor="@android:color/white"/>

sel_btn_background.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
       android:shape="rectangle">
    <gradient
            android:startColor="@color/bluegreen"
            android:endColor="@color/aqua_marine"
            android:angle="-270" />
</shape>

I get result:

How to achieve the below result(left side is the light colour fading to dark on right colour) What value should be added for angle:

标签： android

Answer 1

使用 180 角度而不是 -270 角度

android:angle="360"