Android颜色选择器

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

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

package arui.csdn.generaltools.colorchooser;

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