OwnCustomView.java 文件源码

@Override
protected void onDraw(Canvas canvas) {
    if (needsUpdate) {
        int[] colors = new int[] {topLeftColor, topRightColor, bottomRightColor, bottomLeftColor};

        LinearGradient lg = new LinearGradient(0, 0, getWidth(), getHeight(), colors, null, Shader.TileMode.CLAMP);
        backgroundPaint.setShader(lg);
        needsUpdate = false;
    }

    canvas.drawRect(0, 0, getWidth(), getHeight(), backgroundPaint);
    super.onDraw(canvas);
}