易采站长站为您分析Android中颜色选择器和改变字体颜色的实例教程,其中改变字体颜色用到了ColorPicker颜色选择器,需要的朋友可以参考下

1.构建一张七彩图:

我们经常看到这种样子的颜色选择器吧..

然后其实右边的亮度选择是:

这样我们的代码就可以进行啦...

// 创建七彩图片

private void init() {

int[] oc = { 0xffff0000, 0xffffff00, 0xff00ff00, 0xff00ffff,

0xff0000ff, 0xffff00ff, 0xffff0000 };

float[] op = { 0, 0.16667f, 0.33333f, 0.5f, 0.66667f, 0.83333f, 1 };

LinearGradient lg = new LinearGradient(0, 0, ORIWIDTH, 0, oc, op,

TileMode.MIRROR);

LinearGradient lg2 = new LinearGradient(0, 0, 0, ORIHEIGHT, 0x00808080,

0xff808080, TileMode.MIRROR);

oriColor = Bitmap.createBitmap(ORIWIDTH, ORIHEIGHT, Config.ARGB_8888);

Canvas c = new Canvas(oriColor);

paint.setShader(lg);

c.drawRect(0, 0, ORIWIDTH, ORIHEIGHT, paint);

paint.setShader(lg2);

c.drawRect(0, 0, ORIWIDTH, ORIHEIGHT, paint);

}

// 右边的亮度栏

private void drawABar(Canvas c) {

int x, y;

x = (roundColor & 0x00ffffff);

y = (x | 0xff000000);

LinearGradient lg = new LinearGradient(0, 0, layoutWidth, 0, x, y,

TileMode.MIRROR);

// 初始化 x 240 + 6 * 2

y = ORIHEIGHT + (GAP << 2) - GAP + BARHEIGHT;

paint.setColor(0xffffffff);

c.drawBitmap(aBk, 0, y, paint);

paint.setShader(lg);

c.drawRect(0, y, layoutWidth, y + BARHEIGHT, paint);

}