最近设计要求要一个圆形进度条渐变的需求：

1.画圆形进度条

2.解决渐变

最终实现效果代码

package com.view;

import android.content.Context;

import android.content.res.TypedArray;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Matrix;

import android.graphics.Paint;

import android.graphics.RectF;

import android.graphics.SweepGradient;

import android.util.AttributeSet;

import android.view.View;

import com.fx.R;

public class CompletedView extends View {

// 画实心圆的画笔

private Paint mCirclePaint;

// 画圆环的画笔

private Paint mRingPaint;

// 画圆环的画笔背景色

private Paint mRingPaintBg;

// 画字体的画笔

private Paint mTextPaint;

// 圆形颜色

private int mCircleColor;

// 圆环颜色

private int mRingColor;

// 圆环背景颜色

private int mRingBgColor;

// 半径

private float mRadius;

// 圆环半径

private float mRingRadius;

// 圆环宽度

private float mStrokeWidth;

// 圆心x坐标

private int mXCenter;

// 圆心y坐标

private int mYCenter;

// 字的长度

private float mTxtWidth;

// 字的高度

private float mTxtHeight;

// 总进度

private int mTotalProgress = 100;

// 当前进度

private int mProgress;

private String string;

public CompletedView(Context context, AttributeSet attrs) {

super(context, attrs);

// 获取自定义的属性

initAttrs(context, attrs);

initVariable();

}

//属性

private void initAttrs(Context context, AttributeSet attrs) {

TypedArray typeArray = context.getTheme().obtainStyledAttributes(attrs,

R.styleable.TasksCompletedView, 0, 0);

mRadius = typeArray.getDimension(R.styleable.TasksCompletedView_radius, 80);

mStrokeWidth = typeArray.getDimension(R.styleable.TasksCompletedView_strokeWidth, 10);

mCircleColor = typeArray.getColor(R.styleable.TasksCompletedView_circleColor, 0xFFFFFFFF);

mRingColor = typeArray.getColor(R.styleable.TasksCompletedView_ringColor, 0xFFFFFFFF);

mRingBgColor = typeArray.getColor(R.styleable.TasksCompletedView_ringBgColor, 0xFFFFFFFF);

mRingRadius = mRadius + mStrokeWidth / 2;

}

RectF oval;

//初始化画笔

private void initVariable() {

oval = new RectF();

//内圆

mCirclePaint = new Paint();

mCirclePaint.setAntiAlias(true);

mCirclePaint.setColor(mCircleColor);

mCirclePaint.setStyle(Paint.Style.FILL);

mCirclePaint.setStrokeCap(Paint.Cap.ROUND);

//外圆弧背景

mRingPaintBg = new Paint();

mRingPaintBg.setAntiAlias(true);

mRingPaintBg.setColor(mRingBgColor);

mRingPaintBg.setStyle(Paint.Style.STROKE);

mRingPaintBg.setStrokeWidth(mStrokeWidth);

//外圆弧

mRingPaint = new Paint();

mRingPaint.setAntiAlias(true);

// mRingPaint.setColor(mRingColor);

mRingPaint.setStyle(Paint.Style.STROKE);

mRingPaint.setStrokeWidth(mStrokeWidth);

mRingPaint.setStrokeCap(Paint.Cap.ROUND);//设置线冒样式，有圆 有方

//中间字

mTextPaint = new Paint();

mTextPaint.setAntiAlias(true);

mTextPaint.setStyle(Paint.Style.FILL);

mTextPaint.setColor(mRingColor);

mTextPaint.setTextSize(mRadius / 2);

Paint.FontMetrics fm = mTextPaint.getFontMetrics();

mTxtHeight = (int) Math.ceil(fm.descent - fm.ascent);

}

SweepGradient sweepGradient;

//画图

@Override

protected void onDraw(Canvas canvas) {

mXCenter = getWidth() / 2;

mYCenter = getHeight() / 2;

//内圆

canvas.drawCircle(mXCenter, mYCenter, mRadius, mCirclePaint);

//外圆弧背景

RectF oval1 = new RectF();

oval1.left = (mXCenter - mRingRadius);

oval1.top = (mYCenter - mRingRadius);

oval1.right = mRingRadius * 2 + (mXCenter - mRingRadius);

oval1.bottom = mRingRadius * 2 + (mYCenter - mRingRadius);

canvas.drawArc(oval1, 0, 360, false, mRingPaintBg); //圆弧所在的椭圆对象、圆弧的起始角度、圆弧的角度、是否显示半径连线

//外圆弧

if (mProgress > 0 ) {

oval.left = (mXCenter - mRingRadius);

oval.top = (mYCenter - mRingRadius);

oval.right = mRingRadius * 2 + (mXCenter - mRingRadius);

oval.bottom = mRingRadius * 2 + (mYCenter - mRingRadius);

if (sweepGradient==null) {

int[] arcColors= new int[]{mRingColor,Color.parseColor("#b05e39"),mRingColor};

float[] arcPostion=new float[]{0.0f,0.5f,0.95f};

// sweepGradient = new SweepGradient(mXCenter, mYCenter, mRingColor,Color.parseColor("#b05e39"));

sweepGradient = new SweepGradient(mXCenter, mYCenter, arcColors,arcPostion);

Matrix matrix = new Matrix();

matrix.setRotate(-90,mXCenter,mYCenter);

sweepGradient.setLocalMatrix(matrix);

mRingPaint.setShader(sweepGradient);

}

canvas.drawArc(oval, -90, ((float)mProgress / mTotalProgress) * 360, false, mRingPaint); //

//字体

String txt = mProgress + "%";

mTxtWidth = mTextPaint.measureText(txt, 0, txt.length());

canvas.drawText(txt, mXCenter - mTxtWidth / 2, mYCenter + mTxtHeight / 4, mTextPaint);

}

}

public void setText(String string){

}

//设置进度

public void setProgress(int progress) {

mProgress = progress;

postInvalidate();//重绘

}

}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。