简单的圆形下载进度条
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- 代码片段
package org.zhx.rounprogress; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Path; import android.graphics.PathMeasure; import android.graphics.RectF; import android.graphics.Typeface; import android.util.AttributeSet; import android.util.Log; import android.view.View; /* * ----------------------------------------------------------------- * Copyright (C) 2018-2020, by vogtec, All rights reserved. * ----------------------------------------------------------------- * File: RoundProgress.java * Author: zhouxue * Version: 1.0 * Create: 2018/5/25 14:23 * Changes (from 2018/5/25) * ----------------------------------------------------------------- * 2018/5/25 : Create RoundProgress.java (zhouxue); * ----------------------------------------------------------------- */ public class RoundProgress extends View private String TAG=RoundProgress.class.getSimpleName(); /** * 画笔对象的引用 */ private Paint paint; /** * 圆环的颜色 */ private int roundColor; /** * 圆环进度的颜色 */ private int roundProgressColor; /** * 中间进度百分比的字符串的颜色 */ private int textColor; /** * 中间进度百分比的字符串的字体 */ private float textSize; /** * 圆环的宽度 */ private float roundWidth; /** * 最大进度 */ private int max; /** * 当前进度 */ private int progress; /** * 是否显示中间的进度 */ private boolean textIsDisplayable; /** * 进度的风格，实心或者空心 */ private int style; public static final int STROKE = 0; public static final int FILL = 1; public RoundProgress(Context context) this(context, null); public RoundProgress(Context context, AttributeSet attrs) this(context, attrs, 0); public RoundProgress(Context context, AttributeSet attrs, int defStyle) super(context, attrs, defStyle); paint = new Paint(); TypedArray mTypedArray = context.obtainStyledAttributes(attrs, R.styleable.RoundProgressBar); //获取自定义属性和默认值 （可以在xml 文件里 进行配置） roundColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundColor, Color.RED); roundProgressColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundProgressColor, Color.GREEN); textColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundtextColor, Color.GREEN); textSize = mTypedArray.getDimension(R.styleable.RoundProgressBar_roundtextSize, 15); roundWidth = mTypedArray.getDimension(R.styleable.RoundProgressBar_roundWidth, 5); max = mTypedArray.getInteger(R.styleable.RoundProgressBar_max, 100); textIsDisplayable = mTypedArray.getBoolean(R.styleable.RoundProgressBar_textIsDisplayable, true); style = mTypedArray.getInt(R.styleable.RoundProgressBar_style, 0); mTypedArray.recycle(); @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) super.onMeasure(widthMeasureSpec, heightMeasureSpec); @Override protected void onDraw(Canvas canvas) super.onDraw(canvas); /** * 画最外层的大圆环 */ int centre = getWidth()/2; //获取圆心的x坐标 float dotWidth=4+roundWidth;// 圆弧上小圆点的半径 int radius = (int) (centre - roundWidth/2-dotWidth); //圆环的半径 paint.setColor(roundColor); //设置圆环的颜色 paint.setStyle(Paint.Style.STROKE); //设置空心 paint.setStrokeWidth(roundWidth); //设置圆环的宽度 paint.setAntiAlias(true); //消除锯齿 canvas.drawCircle(centre, centre, radius, paint); //画出圆环 /** * 画进度百分比 */ paint.setStrokeWidth(0); paint.setColor(textColor); paint.setTextSize(textSize); paint.setTypeface(Typeface.DEFAULT_BOLD); //设置字体 int percent = (int)(((float)progress / (float)max) * 100); //中间的进度百分比，先转换成float在进行除法运算，不然都为0 float textWidth = paint.measureText(percent + "%"); //测量字体宽度，我们需要根据字体的宽度设置在圆环中间 // Log.e("log", centre + "@@"+percent+"!!!"+(textIsDisplayable +"!"+(percent != 0) +(style == STROKE))); if(textIsDisplayable && percent != 0 && style == STROKE) canvas.drawText(percent + "%", centre - textWidth / 2, centre + textSize/2, paint); //画出进度百分比 /** * 画圆弧 ，画圆环的进度 */ //设置进度是实心还是空心 paint.setStrokeWidth(roundWidth); //设置圆环的宽度 paint.setColor(roundProgressColor); //设置进度的颜色 RectF oval = new RectF(centre - radius, centre - radius, centre + radius, centre + radius); //用于定义的圆弧的形状和大小的界限 switch (style) case STROKE: paint.setStyle(Paint.Style.STROKE); canvas.drawArc(oval, 0, 360 * progress / max, false, paint); //根据进度画圆弧 break; case FILL: paint.setStyle(Paint.Style.FILL_AND_STROKE); if(progress !=0) canvas.drawArc(oval, 0, 360 * progress / max, true, paint); //根据进度画圆弧 break; // 圆弧上的小圆点 if(progress<max) paint.setStyle(Paint.Style.FILL); //计算当前进度 在圆弧上的位置 Path path = new Path(); path.addArc(oval, 0, 360 * progress / max); PathMeasure measure = new PathMeasure(path, false); float[] floats = new float[2]; measure.getPosTan(measure.getLength(), floats, null); //在当前进度末端 加上一个小圆点 // Log.e("!!!!!!!", floats[0] + "@@" + floats[1]); canvas.drawCircle(floats[0], floats[1], dotWidth, paint); public synchronized int getMax() return max; /** * 设置进度的最大值 * @param max */ public synchronized void setMax(int max) if(max < 0) throw new IllegalArgumentException("max not less than 0"); this.max = max; /** * 获取进度.需要同步 * @return */ public synchronized int getProgress() return progress; /** * 设置进度，此为线程安全控件，由于考虑多线的问题，需要同步 * 刷新界面调用postInvalidate()能在非UI线程刷新 * @param progress */ public synchronized void setProgress(int progress) if(progress < 0) progress=0; if(progress > max) progress = max; if(progress <= max) this.progress = progress; Log.e(TAG, progress + ""); postInvalidate(); public int getCricleColor() return roundColor; public void setCricleColor(int cricleColor) this.roundColor = cricleColor; public int getCricleProgressColor() return roundProgressColor; public void setCricleProgressColor(int cricleProgressColor) this.roundProgressColor = cricleProgressColor; public int getTextColor() return textColor; public void setTextColor(int textColor) this.textColor = textColor; public float getTextSize() return textSize; public void setTextSize(float textSize) this.textSize = textSize; public float getRoundWidth() return roundWidth; public void setRoundWidth(float roundWidth) this.roundWidth = roundWidth;4、下载demo 地址 https://github.com/zhoulinxue/RounProgress.git
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