android关于shape的gradient属性使用下篇-动态java设置

动态设置gradient的好处是可以设置多个颜色变化,做出更过酷炫的颜色变换。

先上效果图:

其实背景就是一个自定义View,然后在布局文件中引用进去:

public class gradientView extends View{
    public gradientView(Context context) {
        super(context);
    }

    public gradientView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }

    public gradientView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        int width = getWidth();
        int height = getHeight();

        int color1 = getResources().getColor(R.color.orange);
        int color2 = getResources().getColor(R.color.splashCenter);
        int color3 = getResources().getColor(R.color.colorPrimaryDark);
        int color4 = getResources().getColor(R.color.green_light);
        int color5 = getResources().getColor(R.color.green);

        Paint paint = new Paint();
        LinearGradient gradient = new LinearGradient(0,0,0,height,new int[]{color1,color2,color3,color4,color5},null, Shader.TileMode.MIRROR);
        paint.setShader(gradient);
        canvas.drawRect(0,0,width,height,paint);
    }
}

在布局文件中引用:

    <com.example.cm.bounce.gradientView
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

网上更多的例子可以看下这篇博客:

https://www.jianshu.com/p/32d17739d378

整个项目的下载地址:

https://github.com/buder-cp/base_component_learn

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转载自blog.csdn.net/cpcpcp123/article/details/81745672
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