我试着以编程方式复制下面的梯度。

 ＆LT;形状的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android＆GT;
    ＆LT;梯度
        机器人：startColor =@色/ startcolor
        机器人：centerColor =＃343434
        机器人：endColor =＃00000000
        机器人：TYPE =放射状
        机器人：gradientRadius =140
        机器人：centerY =45％
     /＆GT;
    ＆LT;边角机器人：半径=0dp/＆GT;
＆LT; /形状＆GT;
 

如何设置编程的paramether？谢谢

 安卓centerY =45％
 

解决方案

http://developer.android.com/reference/android/graphics/drawable/GradientDrawable.html

要设置特定参数（我假设你没有指定一个的centerX值）：

  yourGradientDrawable.setGradientCenter（1.0F，0.45F）;
 

因此​​，为了创建上述梯度（除了用不同的颜色）编程：

  GradientDrawable G =新GradientDrawable（Orientation.TL_BR，新INT [] {getResources（）的getColor（R.color.startcolor），Color.rgb（255，0，0） ，Color.BLUE}）;
g.setGradientType（GradientDrawable.RADIAL_GRADIENT）;
g.setGradientRadius（140.0f）;
g.setGradientCenter（0.0，0.45F）;
 

注：定向忽略径向渐变，但需要注意那些在颜色的构造

Im trying to reproduce the following gradient programmatically.

<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <gradient 
        android:startColor="@color/startcolor" 
        android:centerColor="#343434"
        android:endColor="#00000000"
        android:type="radial"
        android:gradientRadius="140"
        android:centerY="45%"
     />
    <corners android:radius="0dp" />
</shape>

How can I set programmatically the paramether? Thanks

        android:centerY="45%"

http://developer.android.com/reference/android/graphics/drawable/GradientDrawable.html

To set that specific parameter (I'm assuming a centerX value as you haven't specified one):

yourGradientDrawable.setGradientCenter(1.0f,  0.45f);

So to create the above gradient (except with different colors) programatically:

GradientDrawable g = new GradientDrawable(Orientation.TL_BR, new int[] { getResources().getColor(R.color.startcolor), Color.rgb(255, 0, 0), Color.BLUE });
g.setGradientType(GradientDrawable.RADIAL_GRADIENT);
g.setGradientRadius(140.0f);
g.setGradientCenter(0.0f, 0.45f);

Note: The orientation is ignored for a radial gradient but is needed for the constructor that takes colors.