在android活动类中动态更改可绘制的开始颜色和结束颜色 [英] Change drawable start color and end color dynamically in android activity class

问题描述

您好，我正在开发一个Android应用程序，在其中可绘制资源以设置按钮的背景.我想以编程方式更改该可绘制对象的开始和结束颜色，即在按钮单击侦听器内的活动类中.我的可绘制对象看起来像:

Hi I am developing one android application in which I drawable resource to set backgroung for button. I want to change start and end color for that drawable programatically i.e. in activity class inside button click listener. My drawable looks like :

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
  android:shape="rectangle">
  <gradient android:startColor="#be584c" 
    android:endColor="#be584c"
    android:angle="270" />
  <corners android:radius="2dp" />
  <stroke android:width="1px"/>
</shape>

然后将其设置为xml文件中按钮的背景. android:background="@drawable/download_button"

And I set it as background for button in xml file. android:background="@drawable/download_button"

，我想在活动类中更改此drawable的开始颜色和结束颜色.有什么办法可以做到这一点.需要帮忙.谢谢.

and i want to change start color and end color of this drawable in activity class how to do this. Is there any way to f=do this. Need help. Thank you.

推荐答案

是的，有可能.您应该使用 GradientDrawable 来做到这一点.

Yes, it is possible. You should use GradientDrawable to do this.

int colors[] = { 0xff255779, 0xffa6c0cd };

GradientDrawable gradientDrawable = new GradientDrawable(
        GradientDrawable.Orientation.TOP_BOTTOM, colors);

view.setBackgroundDrawable(gradientDrawable);

根据您的要求更改颜色代码.尽管我使用了Color.parseColor("color code")，但是它不起作用.

Change color code as per your requirement. Though I used Color.parseColor("color code"), its not working.

方向有一些选项，如下所示.

There are some option for Orientation like following.

GradientDrawable.Orientation.BOTTOM_TOP;
GradientDrawable.Orientation.LEFT_RIGHT;
GradientDrawable.Orientation.RIGHT_LEFT;

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