调色板

/* * Copyright (C) 2007 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package com.lisn.signing;import android.app.Dialog;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.os.Bundle;import android.view.MotionEvent;import android.view.View;public class ColorPickerDialog extends Dialog {public interface OnColorChangedListener {void colorChanged(int color);}private OnColorChangedListener mListener;private int mInitialColor;private static class ColorPickerView extends View {private Paint mPaint;private Paint mCenterPaint;private Paint mRadialPaint;private final int[] mRadialColors;private OnColorChangedListener mListener;private Paint mGradientPaint;private int[] mLinearColors;ColorPickerView(Context c, OnColorChangedListener l, int color) {super(c);mListener = l;mRadialColors = new int[] { 0xFFFF0000, 0xFFFF00FF, 0xFF0000FF,0xFF00FFFF, 0xFF00FF00, 0xFFFFFF00, 0xFFFF0000 };Shader s = new SweepGradient(0, 0, mRadialColors, null);mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);mPaint.setShader(s);mPaint.setStyle(Paint.Style.STROKE);mPaint.setStrokeWidth(32);mLinearColors = getColors(color);Shader shader = new LinearGradient(0, 0, Center_X * 2, 0,mLinearColors, null, Shader.TileMode.CLAMP);mGradientPaint = new Paint(Paint.ANTI_ALIAS_FLAG);mGradientPaint.setStyle(Paint.Style.STROKE);mGradientPaint.setShader(shader);mGradientPaint.setStrokeWidth(32);mCenterPaint = new Paint(Paint.ANTI_ALIAS_FLAG);mCenterPaint.setColor(color);mCenterPaint.setStrokeWidth(6);mRadialPaint = new Paint(Paint.ANTI_ALIAS_FLAG);mRadialPaint.setColor(color);mRadialPaint.setStrokeWidth(6);}private int[] getColors(int color) {if (color == Color.BLACK || color == Color.WHITE) {return new int[] { Color.BLACK, Color.WHITE };}return new int[] { Color.BLACK, color, Color.WHITE };}private boolean mHighlightCenter;private boolean mTrackingCenter;private boolean mTrackingLinGradient;@Overrideprotected void onDraw(Canvas canvas) {float r = COLOR_CIRCLE - mPaint.getStrokeWidth() * 0.5f;canvas.translate(Center_X, COLOR_CIRCLE);canvas.drawOval(new RectF(-r, -r, r, r), mPaint);canvas.drawCircle(0, 0, CENTER_RADIUS, mCenterPaint);if (mTrackingCenter) {int color = mCenterPaint.getColor();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(color);}int color = mRadialPaint.getColor();mLinearColors = getColors(color);Shader shader = new LinearGradient(0, 0, Center_X * 2, 0,mLinearColors, null, Shader.TileMode.CLAMP);mGradientPaint.setShader(shader);canvas.translate(-Center_X, 0);canvas.drawLine(0, r + 50, Center_X * 2, r + 50, mGradientPaint);}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {/* * super.onMeasure(widthMeasureSpec, heightMeasureSpec); int * parentWidth = MeasureSpec.getSize(widthMeasureSpec); int * parentHeight = MeasureSpec.getSize(heightMeasureSpec); * setMeasuredDimension(parentWidth, parentHeight); Center_X = (int) * Math.ceil(parentWidth*.5); Center_Y = (int) * Math.ceil(parentHeight*.5); */setMeasuredDimension(Center_X * 2, Center_Y * 2 + 70);}private static int Center_X = 110;private static int Center_Y = 100;private static final int CENTER_RADIUS = 32;private static final int COLOR_CIRCLE = 100;private int ave(int s, int d, float p) {return s + Math.round(p * (d - s));}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 indexint 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 static final float PI = 3.1415926f;@Overridepublic boolean onTouchEvent(MotionEvent event) {float x = event.getX() - Center_X;float y = event.getY() - COLOR_CIRCLE;boolean inCenter = Math.sqrt(x * x + y * y) <= CENTER_RADIUS;boolean outOfRadialGradient = y > COLOR_CIRCLE;switch (event.getAction()) {case MotionEvent.ACTION_DOWN:mTrackingCenter = inCenter;mTrackingLinGradient = outOfRadialGradient;if (inCenter) {mHighlightCenter = true;invalidate();break;}case MotionEvent.ACTION_MOVE:if (mTrackingCenter) {if (mHighlightCenter != inCenter) {mHighlightCenter = inCenter;invalidate();}} else if (mTrackingLinGradient) {float unit = Math.max(0,Math.min(Center_X * 2, x + Center_X))/ (Center_X * 2);mCenterPaint.setColor(interpColor(mLinearColors, unit));invalidate();} else {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;}int color = interpColor(mRadialColors, unit);mCenterPaint.setColor(color);mRadialPaint.setColor(color);invalidate();}break;case MotionEvent.ACTION_UP:if (mTrackingCenter) {if (inCenter) {mListener.colorChanged(mCenterPaint.getColor());}mTrackingCenter = false; // so we draw w/o haloinvalidate();}break;}return true;}}public ColorPickerDialog(Context context, OnColorChangedListener listener,int initialColor) {super(context);mListener = listener;mInitialColor = initialColor;}@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);OnColorChangedListener l = new OnColorChangedListener() {public void colorChanged(int color) {mListener.colorChanged(color);dismiss();}};setContentView(new ColorPickerView(getContext(), l, mInitialColor));setTitle("调色板"); //标题/* * Display display = * this.getWindow().getWindowManager().getDefaultDisplay(); * if(display.getWidth() < display.getHeight()) { * this.getWindow().setLayout( LayoutParams.FILL_PARENT, (int) * Math.ceil(display.getHeight()*.7f) ); } else { * this.getWindow().setLayout( (int) Math.ceil(display.getWidth()*.7f), * LayoutParams.FILL_PARENT ); } */}}

使用方法：

new ColorPickerDialog(this, new ColorPickerDialog.OnColorChangedListener() {    public void colorChanged(int color) {        Log.e(TAG, "colorChanged:修改后的颜色值 "+color );    }}, Color.WHITE).show();  //Color.WHITE默认传入的颜色值