自定义控件之圆形颜色渐变进度条--SweepGradient

前几天在群里面有人找圆形可颜色渐变进度条，其中主要的知识点是SweepGradient；

 mSweepGradient = new SweepGradient(240, 360, new int[] {
　　Color.CYAN,
　　Color.DKGRAY,
　　Color.GRAY,
　　Color.LTGRAY,
　　Color.MAGENTA,    
　　Color.GREEN,
　　Color.TRANSPARENT, 
　　Color.BLUE },
　　 null); 

如上：第三个参数为渐变颜色内容，前两个是坐标信息，240：渲染中心点x 坐标；360：渲染中心y 点坐标。

先绘制圆形：

package com.soyoungboy.sweepgradientprogress;

import android.content.Context;
import android.graphics.BlurMaskFilter;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.EmbossMaskFilter;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;
/**
 * 圆形颜色渐变的进度条
 * @author soyoungboy
 *
 */
public class SweepGradientCircleProgressBar extends View {
    private Paint pathPaint;
    private Paint fillArcPaint;
    // 设置光源的方向
    private float[] direction = new float[] {1, 1, 1};

    // 设置环境光亮度
    private float light = 0.4f;

    // 选择要应用的反射等级
    private float specular = 6;
    private EmbossMaskFilter emboss;
    private RectF oval ;
    private BlurMaskFilter mBlur;
    // view重绘的标记
    private boolean reset = false;
    // 向 mask应用一定级别的模糊
    private float blur = 3.5f;
    private int arcradus = 30;
    public SweepGradientCircleProgressBar(Context context ,AttributeSet attrs) {
        super(context,attrs);
        initPaint();
        oval = new RectF();
        emboss = new EmbossMaskFilter(direction, light, specular, blur);
        mBlur = new BlurMaskFilter(20, BlurMaskFilter.Blur.NORMAL);
    }

    //初始化画笔操作
    private void initPaint() {
        //初始化画笔操作
        pathPaint = new Paint();
        // 设置是否抗锯齿
        pathPaint.setAntiAlias(true);
        // 帮助消除锯齿
        pathPaint.setFlags(Paint.ANTI_ALIAS_FLAG);
        // 设置中空的样式
        pathPaint.setStyle(Paint.Style.STROKE);
        pathPaint.setDither(true);
        pathPaint.setStrokeJoin(Paint.Join.ROUND);

        fillArcPaint = new Paint();
        // 设置是否抗锯齿
        fillArcPaint.setAntiAlias(true);
        // 帮助消除锯齿
        fillArcPaint.setFlags(Paint.ANTI_ALIAS_FLAG);
        // 设置中空的样式
        fillArcPaint.setStyle(Paint.Style.STROKE);
        fillArcPaint.setDither(true);
        fillArcPaint.setStrokeJoin(Paint.Join.ROUND);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        int height = getMeasuredWidth();
        int width = getMeasuredWidth();
        //半径 = 宽/2-圆环的宽度
        int radius = width/2-arcradus;
        int cx = width/2;
        int cy = height/2;
        //绘制画笔颜色
        pathPaint.setColor(Color.RED);
        //画笔的宽度
        pathPaint.setStrokeWidth(10);
        pathPaint.setMaskFilter(emboss);
        canvas.drawCircle(cx, cy, radius, pathPaint);
    }


}

效果如下：

在上面基础上，绘制大圆和小圆：

package com.soyoungboy.sweepgradientprogress;

import android.content.Context;
import android.graphics.BlurMaskFilter;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.EmbossMaskFilter;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;
/**
 * 圆形颜色渐变的进度条
 * @author soyoungboy
 *
 */
public class SweepGradientCircleProgressBar extends View {
    private Paint pathPaint;
    private Paint fillArcPaint;
    // 设置光源的方向
    private float[] direction = new float[] {1, 1, 1};

    // 设置环境光亮度
    private float light = 0.4f;

    // 选择要应用的反射等级
    private float specular = 6;
    private EmbossMaskFilter emboss;
    private RectF oval ;
    private BlurMaskFilter mBlur;
    // view重绘的标记
    private boolean reset = false;
    // 向 mask应用一定级别的模糊
    private float blur = 3.5f;
    private int arcradus = 30;
    public SweepGradientCircleProgressBar(Context context ,AttributeSet attrs) {
        super(context,attrs);
        initPaint();
        oval = new RectF();
        emboss = new EmbossMaskFilter(direction, light, specular, blur);
        mBlur = new BlurMaskFilter(20, BlurMaskFilter.Blur.NORMAL);
    }

    //初始化画笔操作
    private void initPaint() {
        //初始化画笔操作
        pathPaint = new Paint();
        // 设置是否抗锯齿
        pathPaint.setAntiAlias(true);
        // 帮助消除锯齿
        pathPaint.setFlags(Paint.ANTI_ALIAS_FLAG);
        // 设置中空的样式
        pathPaint.setStyle(Paint.Style.STROKE);
        pathPaint.setDither(true);
        pathPaint.setStrokeJoin(Paint.Join.ROUND);

        fillArcPaint = new Paint();
        // 设置是否抗锯齿
        fillArcPaint.setAntiAlias(true);
        // 帮助消除锯齿
        fillArcPaint.setFlags(Paint.ANTI_ALIAS_FLAG);
        // 设置中空的样式
        fillArcPaint.setStyle(Paint.Style.STROKE);
        fillArcPaint.setDither(true);
        fillArcPaint.setStrokeJoin(Paint.Join.ROUND);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        if (reset) {
            canvas.drawColor(Color.TRANSPARENT);
            reset = false;
        }
        drawcircle(canvas);

    }

    private void drawcircle(Canvas canvas) {
        int height = getMeasuredWidth();
        int width = getMeasuredWidth();
        //半径 = 宽/2-圆环的宽度
        int radius = width/2-arcradus;
        int cx = width/2;
        int cy = height/2;
        //绘制画笔颜色
        pathPaint.setColor(Color.RED);
        //画笔的宽度
        pathPaint.setStrokeWidth(1);
        pathPaint.setMaskFilter(emboss);
        canvas.drawCircle(cx, cy, radius, pathPaint);
        pathPaint.setColor(Color.BLUE);
        //绘制大圆
        canvas.drawCircle(width / 2, height / 2, radius + arcradus
                / 2 + 0.5f, pathPaint);
        //绘制小圆
        canvas.drawCircle(width / 2, height / 2, radius - arcradus
                / 2 - 0.5f, pathPaint);
    }


}

效果：

去掉绘制中间圆，并不会圆弧：

package com.soyoungboy.sweepgradientprogress;

import android.content.Context;
import android.graphics.BlurMaskFilter;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.EmbossMaskFilter;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.SweepGradient;
import android.util.AttributeSet;
import android.view.View;
/**
 * 圆形颜色渐变的进度条
 * @author soyoungboy
 *
 */
public class SweepGradientCircleProgressBar extends View {
    private Paint pathPaint;
    private Paint fillArcPaint;
    // 设置光源的方向
    private float[] direction = new float[] {1, 1, 1};

    // 设置环境光亮度
    private float light = 0.4f;
    //渐变数组
    private int[] arcColors = new int[] {Colors.RED,Colors.RED_TRANSLUCENT
    };
    // 选择要应用的反射等级
    private float specular = 6;
    private EmbossMaskFilter emboss;
    private RectF oval ;
    private BlurMaskFilter mBlur;
    // view重绘的标记
    private boolean reset = false;
    // 向 mask应用一定级别的模糊
    private float blur = 3.5f;
    private int arcradus = 30;
    public SweepGradientCircleProgressBar(Context context ,AttributeSet attrs) {
        super(context,attrs);
        initPaint();
        oval = new RectF();
        emboss = new EmbossMaskFilter(direction, light, specular, blur);
        mBlur = new BlurMaskFilter(20, BlurMaskFilter.Blur.NORMAL);
    }

    //初始化画笔操作
    private void initPaint() {
        //初始化画笔操作
        pathPaint = new Paint();
        // 设置是否抗锯齿
        pathPaint.setAntiAlias(true);
        // 帮助消除锯齿
        pathPaint.setFlags(Paint.ANTI_ALIAS_FLAG);
        // 设置中空的样式
        pathPaint.setStyle(Paint.Style.STROKE);
        pathPaint.setDither(true);
        pathPaint.setStrokeJoin(Paint.Join.ROUND);

        fillArcPaint = new Paint();
        // 设置是否抗锯齿
        fillArcPaint.setAntiAlias(true);
        // 帮助消除锯齿
        fillArcPaint.setFlags(Paint.ANTI_ALIAS_FLAG);
        // 设置中空的样式
        fillArcPaint.setStyle(Paint.Style.STROKE);
        fillArcPaint.setDither(true);
        fillArcPaint.setStrokeJoin(Paint.Join.ROUND);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        if (reset) {
            canvas.drawColor(Color.TRANSPARENT);
            reset = false;
        }
        drawcircle(canvas);

    }

    private void drawcircle(Canvas canvas) {
        int height = getMeasuredWidth();
        int width = getMeasuredWidth();
        //半径 = 宽/2-圆环的宽度
        int radius = width/2-arcradus;
        int cx = width/2;
        int cy = height/2;
        pathPaint.setColor(Color.BLUE);
        //绘制大圆
        canvas.drawCircle(width / 2, height / 2, radius + arcradus
                / 2 + 0.5f, pathPaint);
        //绘制小圆
        canvas.drawCircle(width / 2, height / 2, radius - arcradus
                / 2 - 0.5f, pathPaint);

        // 环形颜色填充
        SweepGradient sweepGradient =
                new SweepGradient(width / 2, height / 2, arcColors, null);
        fillArcPaint.setShader(sweepGradient);
        // 设置画笔为白色

        // 模糊效果
        fillArcPaint.setMaskFilter(mBlur);
        // 设置线的类型,边是圆的
        fillArcPaint.setStrokeCap(Paint.Cap.ROUND);

        //设置圆弧的宽度
        fillArcPaint.setStrokeWidth(arcradus+1);
        // 确定圆弧的绘制位置，也就是里面圆弧坐标和外面圆弧坐标  
        oval.set(width / 2 - radius, height / 2 - radius, width
                / 2 + radius, height / 2 + radius);
        // 画圆弧，第二个参数为：起始角度，第三个为跨的角度，第四个为true的时候是实心，false的时候为空心
        canvas.drawArc(oval,
                0,
                ((float)300 /360 ) * 360,
                false,
                fillArcPaint);
    }


}

效果如下：

尼玛，丑爆了。

 控制进度的显示，主要是progress和max之间的配合，通过外部设置progress进度来控制进度条的动态：

上面代码修改成如下：

package com.soyoungboy.sweepgradientprogress;

import android.content.Context;
import android.graphics.BlurMaskFilter;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.EmbossMaskFilter;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.SweepGradient;
import android.util.AttributeSet;
import android.view.View;
/**
 * 圆形颜色渐变的进度条
 * @author soyoungboy
 *
 */
public class SweepGradientCircleProgressBar extends View {
    private Paint pathPaint;
    private Paint fillArcPaint;
    // 设置光源的方向
    private float[] direction = new float[] {1, 1, 1};

    // 设置环境光亮度
    private float light = 0.4f;
    //渐变数组
    private int[] arcColors = new int[] {Colors.RED,Colors.RED_TRANSLUCENT
    };
    // 选择要应用的反射等级
    private float specular = 6;
    private EmbossMaskFilter emboss;
    private RectF oval ;
    private BlurMaskFilter mBlur;
    // view重绘的标记
    private boolean reset = false;
    // 向 mask应用一定级别的模糊
    private float blur = 3.5f;
    private int arcradus = 30;
    //初始化进度
    private int progress = 0;
    //设置进度最大值
    private int max = 100;
    public SweepGradientCircleProgressBar(Context context ,AttributeSet attrs) {
        super(context,attrs);
        initPaint();
        oval = new RectF();
        emboss = new EmbossMaskFilter(direction, light, specular, blur);
        mBlur = new BlurMaskFilter(20, BlurMaskFilter.Blur.NORMAL);
    }

    //初始化画笔操作
    private void initPaint() {
        //初始化画笔操作
        pathPaint = new Paint();
        // 设置是否抗锯齿
        pathPaint.setAntiAlias(true);
        // 帮助消除锯齿
        pathPaint.setFlags(Paint.ANTI_ALIAS_FLAG);
        // 设置中空的样式
        pathPaint.setStyle(Paint.Style.STROKE);
        pathPaint.setDither(true);
        pathPaint.setStrokeJoin(Paint.Join.ROUND);

        fillArcPaint = new Paint();
        // 设置是否抗锯齿
        fillArcPaint.setAntiAlias(true);
        // 帮助消除锯齿
        fillArcPaint.setFlags(Paint.ANTI_ALIAS_FLAG);
        // 设置中空的样式
        fillArcPaint.setStyle(Paint.Style.STROKE);
        fillArcPaint.setDither(true);
        fillArcPaint.setStrokeJoin(Paint.Join.ROUND);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        if (reset) {
            canvas.drawColor(Color.TRANSPARENT);
            reset = false;
        }
        drawcircle(canvas);

    }

    private void drawcircle(Canvas canvas) {
        int height = getMeasuredWidth();
        int width = getMeasuredWidth();
        //半径 = 宽/2-圆环的宽度
        int radius = width/2-arcradus;
        int cx = width/2;
        int cy = height/2;
        pathPaint.setColor(Color.BLUE);
        //绘制大圆
        canvas.drawCircle(width / 2, height / 2, radius + arcradus
                / 2 + 0.5f, pathPaint);
        //绘制小圆
        canvas.drawCircle(width / 2, height / 2, radius - arcradus
                / 2 - 0.5f, pathPaint);

        // 环形颜色填充
        SweepGradient sweepGradient =
                new SweepGradient(width / 2, height / 2, arcColors, null);
        fillArcPaint.setShader(sweepGradient);
        // 设置画笔为白色

        // 模糊效果
        fillArcPaint.setMaskFilter(mBlur);
        // 设置线的类型,边是圆的
        fillArcPaint.setStrokeCap(Paint.Cap.ROUND);

        //设置圆弧的宽度
        fillArcPaint.setStrokeWidth(arcradus+1);
        // 确定圆弧的绘制位置，也就是里面圆弧坐标和外面圆弧坐标  
        oval.set(width / 2 - radius, height / 2 - radius, width
                / 2 + radius, height / 2 + radius);
        // 画圆弧，第二个参数为：起始角度，第三个为跨的角度，第四个为true的时候是实心，false的时候为空心
        canvas.drawArc(oval,
                0,
                ((float)progress /max ) * 360,
                false,
                fillArcPaint);
    }

    public int getProgress() {
        return progress;
    }

    public void setProgress(int progress) {
        this.progress = progress;
        this.invalidate();
    }

    public int getMax() {
        return max;
    }

    public void setMax(int max) {
        this.max = max;
    }
    /**
     * 描述：重置进度
     * 
     * @throws
     */
    public void reset() {
        reset = true;
        this.progress = 0;
        this.invalidate();
    }

}

activity代码：

package com.soyoungboy.sweepgradientprogress;

import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity implements OnClickListener{
    private SweepGradientCircleProgressBar progress;
    private Button resetBtn;
    // 最大100
    private int max = 100;
    private int myProgress = 0;
    private Handler handler = new Handler() {
        public void handleMessage(android.os.Message msg) {
            switch (msg.what) {
            case 1:
                startAddProgress();
                break;

            default:
                break;
            }
        };
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        progress = (SweepGradientCircleProgressBar) findViewById(R.id.progress);
        resetBtn = (Button) findViewById(R.id.resetBtn);
        resetBtn.setOnClickListener(this);
        startAddProgress();
    }

    private void startAddProgress() {
        myProgress = myProgress + 10;
        progress.setProgress(myProgress);
        handler.sendEmptyMessageDelayed(1, 1000);

    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.resetBtn:
            //重置操作
            myProgress = 0;
            progress.reset();
            break;

        default:
            break;
        }
    }
}

效果如下：

增加控制颜色的代码：

public int[] getArcColors() {
        return arcColors;
    }

    public void setArcColors(int[] arcColors) {
        this.arcColors = arcColors;
    }

activity中使用：

    private void startAddProgress() {
        myProgress = myProgress + 10;
        progress.setProgress(myProgress);
        
        int[] arcColors = new int[]{
                Color.parseColor("#99cccc"),
                Color.parseColor("#ccffff"),
                Color.parseColor("#ffcccc"),
                Color.parseColor("#6699cc"),
                Color.parseColor("#99ccff"),
                Color.parseColor("#6699cc"),
                Color.parseColor("#cc6699"),
                Color.parseColor("#ffff00")
        };
        progress.setArcColors(arcColors );
        handler.sendEmptyMessageDelayed(1, 1000);

    }

效果如下：

为了不至于开头那段颜色那么突兀，也就是丑，可以修改代码中颜色数组，将颜色数组第一个颜色 = 最后一个颜色，就完美了，就好看了

Demo放到github上面： 

https://github.com/soyoungboy/SweepGradientProgress