How to set corner radiuses for the button in java code?

问题

I want to set the rounded corners without xml. How can I do it in java code?

Button b = new Button (this);
b.set???? (??) ;

I tried to write b.setCornerRadius(3.0f), but it is undefined for button object. Thanks.

回答1:

create a shape in your drawable folder and set the desired radius and set this drawable as background to your button:

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
        
    <item>
        <shape android:shape="rectangle">
            <corners android:radius="5dip"/>
        </shape>
    </item>
</layer-list>

回答2:

Use GradientDrawable

GradientDrawable gdDefault = new GradientDrawable();
gdDefault.setColor(bgColor);
gdDefault.setCornerRadius(cornerRadius);
gdDefault.setStroke(strokeWidth, strokeColor);

回答3:

See the documentation for Shape Drawable

回答4:

Try setGradientRadius(). setCornerRadius() set wrong size.

GradientDrawable drawable = (GradientDrawable)image.getBackground();
drawable.setGradientRadius(radiuspx);

来源：https://stackoverflow.com/questions/8709595/how-to-set-corner-radiuses-for-the-button-in-java-code