学步园

参考网上文章，做了两种颜色选择器。

一种是固定颜色的选择器，这个很简单，只要画出来各种颜色区域，用户选择哪个，就选择了什么颜色。

另一种是万能颜色选择器，这个有一些算法的，所以就参考了网上的文章（由于原始出处不详，就不表示感谢了），又做了一些优化和修改。

目前的这个万能颜色选择器的功能已经足够了，也没什么可保密的，就放上来，给需要的人做个参考。喜欢就拿去好了。

package arui.csdn.generaltools.colorchooser.universalcolor;<br /> import arui.csdn.generaltools.colorchooser.ColorChooserType;<br /> import arui.csdn.generaltools.colorchooser.OnColorChangedListener;<br /> import android.content.Context;<br /> import android.graphics.Canvas;<br /> import android.graphics.Color;<br /> import android.graphics.LinearGradient;<br /> import android.graphics.Paint;<br /> import android.graphics.RectF;<br /> import android.graphics.Shader;<br /> import android.graphics.SweepGradient;<br /> import android.view.MotionEvent;<br /> import android.view.View;<br /> /**<br /> * Universal color view class. This class will draw color chooser graph.<br /> *<br /> * @author http://blog.csdn.net/arui319<br /> *<br /> */<br /> public class UniversalColorView extends View {<br /> private Paint mPaint;<br /> private Paint mCenterPaint;<br /> private Paint mHSVPaint;<br /> private final int[] mColors;<br /> private int[] mHSVColors;<br /> private boolean mRedrawHSV;<br /> private OnColorChangedListener mListener;<br /> private boolean mTrackingCenter;<br /> private boolean mHighlightCenter;<br /> private static final int CENTER_X = 100;<br /> private static final int CENTER_Y = CENTER_X;<br /> private static final int CENTER_RADIUS = 30;<br /> private static final int OUTER_RADIUS = 100;<br /> private static final int HSV_X = CENTER_X;<br /> private static final int HSV_Y_TOP = CENTER_Y + 10;<br /> private static final int HSV_Y_BOTOM = HSV_Y_TOP + 20;<br /> private static final float PI = 3.1415926f;<br /> public UniversalColorView(Context context, OnColorChangedListener listener,<br /> int color) {<br /> super(context);<br /> this.setBackgroundColor(Color.LTGRAY);<br /> mListener = listener;<br /> mColors = new int[] { 0xFFFF0000, 0xFFFF00FF, 0xFF0000FF, 0xFF00FFFF,<br /> 0xFF00FF00, 0xFFFFFF00, 0xFFFF0000 };<br /> Shader s = new SweepGradient(0, 0, mColors, null);<br /> mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);<br /> mPaint.setShader(s);<br /> mPaint.setStyle(Paint.Style.STROKE);<br /> mPaint.setStrokeWidth(55);<br /> mCenterPaint = new Paint(Paint.ANTI_ALIAS_FLAG);<br /> mCenterPaint.setColor(color);<br /> mCenterPaint.setStrokeWidth(5);<br /> mHSVColors = new int[] { 0xFF000000, color, 0xFFFFFFFF };<br /> mHSVPaint = new Paint(Paint.ANTI_ALIAS_FLAG);<br /> mHSVPaint.setStrokeWidth(10);<br /> mRedrawHSV = true;<br /> }<br /> @Override<br /> protected void onDraw(Canvas canvas) {<br /> float r = CENTER_X - mPaint.getStrokeWidth() * 0.5f;<br /> canvas.translate(CENTER_X, CENTER_X);<br /> int c = mCenterPaint.getColor();<br /> if (mRedrawHSV) {<br /> mHSVColors[1] = c;<br /> mHSVPaint.setShader(new LinearGradient(0 - HSV_X, 0, HSV_X, 0,<br /> mHSVColors, null, Shader.TileMode.CLAMP));<br /> }<br /> canvas.drawOval(new RectF(-r, -r, r, r), mPaint);<br /> canvas.drawCircle(0, 0, CENTER_RADIUS, mCenterPaint);<br /> canvas.drawRect(new RectF(0 - HSV_X, HSV_Y_TOP, HSV_X, HSV_Y_BOTOM),<br /> mHSVPaint);<br /> if (mTrackingCenter) {<br /> mCenterPaint.setStyle(Paint.Style.STROKE);<br /> if (mHighlightCenter) {<br /> mCenterPaint.setAlpha(0xFF);<br /> } else {<br /> mCenterPaint.setAlpha(0x80);<br /> }<br /> canvas.drawCircle(0, 0, CENTER_RADIUS<br /> + mCenterPaint.getStrokeWidth(), mCenterPaint);<br /> mCenterPaint.setStyle(Paint.Style.FILL);<br /> mCenterPaint.setColor(c);<br /> }<br /> mRedrawHSV = true;<br /> }<br /> @Override<br /> protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {<br /> setMeasuredDimension(CENTER_X * 2, HSV_Y_BOTOM * 2 - 20);<br /> }<br /> @Override<br /> public boolean onTouchEvent(MotionEvent event) {<br /> float x = event.getX() - CENTER_X;<br /> float y = event.getY() - CENTER_Y;<br /> double radius = Math.sqrt(x * x + y * y);<br /> boolean inCenter = radius <= CENTER_RADIUS;<br /> boolean inOuter = radius <= OUTER_RADIUS;<br /> switch (event.getAction()) {<br /> case MotionEvent.ACTION_DOWN:<br /> mTrackingCenter = inCenter;<br /> if (inCenter) {<br /> mHighlightCenter = true;<br /> invalidate();<br /> break;<br /> }<br /> case MotionEvent.ACTION_MOVE:<br /> if (mTrackingCenter) {<br /> if (mHighlightCenter != inCenter) {<br /> mHighlightCenter = inCenter;<br /> invalidate();<br /> }<br /> } else if ((x >= 0 - HSV_X && x <= HSV_X)<br /> && (y <= HSV_Y_BOTOM && y >= HSV_Y_TOP)) {<br /> // see if we are in the hsv slider<br /> int a, r, g, b, c0, c1;<br /> float p;<br /> // set the center paint to this color<br /> if (x < 0) {<br /> c0 = mHSVColors[0];<br /> c1 = mHSVColors[1];<br /> p = (x + 100) / 100;<br /> } else {<br /> c0 = mHSVColors[1];<br /> c1 = mHSVColors[2];<br /> p = x / 100;<br /> }<br /> a = ave(Color.alpha(c0), Color.alpha(c1), p);<br /> r = ave(Color.red(c0), Color.red(c1), p);<br /> g = ave(Color.green(c0), Color.green(c1), p);<br /> b = ave(Color.blue(c0), Color.blue(c1), p);<br /> mCenterPaint.setColor(Color.argb(a, r, g, b));<br /> mRedrawHSV = false;<br /> invalidate();<br /> } else if (inOuter) {<br /> float angle = (float) Math.atan2(y, x);<br /> // need to turn angle [-PI ... PI] into unit [0....1]<br /> float unit = angle / (2 * PI);<br /> if (unit < 0) {<br /> unit += 1;<br /> }<br /> mCenterPaint.setColor(interpColor(mColors, unit));<br /> invalidate();<br /> }<br /> break;<br /> case MotionEvent.ACTION_UP:<br /> if (mTrackingCenter) {<br /> if (inCenter && mListener != null) {<br /> mListener.colorChanged(this,<br /> ColorChooserType.UNIVERSAL_COLOR_TYPE, mCenterPaint<br /> .getColor());<br /> }<br /> mTrackingCenter = false;<br /> invalidate();<br /> }<br /> break;<br /> }<br /> return true;<br /> }<br /> private int interpColor(int colors[], float unit) {<br /> if (unit <= 0) {<br /> return colors[0];<br /> }<br /> if (unit >= 1) {<br /> return colors[colors.length - 1];<br /> }<br /> float p = unit * (colors.length - 1);<br /> int i = (int) p;<br /> p -= i;<br /> // now p is just the fractional part [0...1) and i is the index<br /> int c0 = colors[i];<br /> int c1 = colors[i + 1];<br /> int a = ave(Color.alpha(c0), Color.alpha(c1), p);<br /> int r = ave(Color.red(c0), Color.red(c1), p);<br /> int g = ave(Color.green(c0), Color.green(c1), p);<br /> int b = ave(Color.blue(c0), Color.blue(c1), p);<br /> return Color.argb(a, r, g, b);<br /> }<br /> private int ave(int s, int d, float p) {<br /> return s + Math.round(p * (d - s));<br /> }<br /> public int getColor() {<br /> return mCenterPaint.getColor();<br /> }<br /> public void setColor(int color) {<br /> mCenterPaint.setColor(color);<br /> }<br /> }<br />  

package arui.csdn.generaltools.colorchooser;<br /> /**<br /> * color changed listener.<br /> *<br /> * @author http://blog.csdn.net/arui319<br /> *<br /> */<br /> public interface OnColorChangedListener {<br /> /**<br /> * Color changed event happened.<br /> *<br /> * @param source<br /> * event source object<br /> * @param type<br /> * ColorChooserType<br /> * @param color<br /> * color int value<br /> */<br /> public void colorChanged(Object source, ColorChooserType type, int color);<br /> } 

package arui.csdn.generaltools.colorchooser;</p> <p>/**<br /> * Color chooser's type. One is defined color panel, another is universal color<br /> * panel.<br /> *<br /> * @author http://blog.csdn.net/arui319<br /> *<br /> */<br /> public class ColorChooserType {<br /> private int type = 0;<br /> private static final int DEFINED_COLOR = 1;<br /> private static final int UNIVERSAL_COLOR = 2;<br /> public static final ColorChooserType DEFINED_COLOR_TYPE = new ColorChooserType(<br /> DEFINED_COLOR);<br /> public static final ColorChooserType UNIVERSAL_COLOR_TYPE = new ColorChooserType(<br /> UNIVERSAL_COLOR);<br /> private ColorChooserType(int type) {<br /> this.type = type;<br /> }<br /> public int getType() {<br /> return type;<br /> }<br /> @Override<br /> public boolean equals(Object type) {<br /> if (type instanceof ColorChooserType) {<br /> if (this.getType() == ((ColorChooserType) type).getType()) {<br /> return true;<br /> }<br /> }<br /> return false;<br /> }<br /> @Override<br /> public int hashCode() {<br /> return this.getType();<br /> }<br /> }<br />