圆形进度条的实现网上搜有很多,项目中需要用到就拿来主义了,然后进行了适当的改进。
1. 自定义控件实现
java类
package com.xxx.views; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.RectF; import android.graphics.Typeface; import android.util.AttributeSet; import android.view.View; import com.xxx.R; public class RoundProgress extends View { /** * 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大小 */ 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 defStyleAttr) { super(context, attrs, defStyleAttr); paint = new Paint(); TypedArray mTypedArray = context.obtainStyledAttributes(attrs, R.styleable.RoundProgress); //获取自定义属性和默认值 roundColor = mTypedArray.getColor(R.styleable.RoundProgress_round_color, Color.GRAY); roundProgressColor = mTypedArray.getColor(R.styleable.RoundProgress_round_progress_color, Color.RED); textColor = mTypedArray.getColor(R.styleable.RoundProgress_text_color, Color.RED); textSize = mTypedArray.getDimension(R.styleable.RoundProgress_text_size, 15); roundWidth = mTypedArray.getDimension(R.styleable.RoundProgress_round_width, 5); max = mTypedArray.getInteger(R.styleable.RoundProgress_max_, 100); textIsDisplayable = mTypedArray.getBoolean(R.styleable.RoundProgress_text_isDisplayable, false); style = mTypedArray.getInt(R.styleable.RoundProgress_style_, STROKE); mTypedArray.recycle(); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { //测量控件应占的宽高大小,此处非必需,只是为了确保布局中设置的宽高不一致时仍显示完整的圆 int measureWidth = MeasureSpec.getSize(widthMeasureSpec); int measureHeight = MeasureSpec.getSize(heightMeasureSpec); setMeasuredDimension(Math.min(measureWidth, measureHeight), Math.min(measureWidth, measureHeight)); } @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 int radius = (int) (centre - roundWidth / 2); //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 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, -90, 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, -90, 360 * progress / max, true, paint); //根据进度画圆弧 break; } } } 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,由于考虑多线程问题,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){ throw new IllegalArgumentException("progress not less than 0"); } if(progress > max){ progress = max; } if(progress <= max){ this.progress = 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; } }
attr.xml文件
<?xml version="1.0" encoding="utf-8"?> <resources> <declare-styleable name="RoundProgress"> <attr name="round_color" format="color" /> <attr name="round_progress_color" format="color" /> <attr name="round_width" format="dimension"/> <attr name="text_color" format="color" /> <attr name="text_size" format="dimension" /> <attr name="max_" format="integer"/> <attr name="text_isDisplayable" format="boolean"/> <attr name="style_"> <enum name="STROKE" value="0"/> <enum name="FILL" value="1"/> </attr> </declare-styleable> </resources>
注意:在自定义控件属性时,若在android工程中已经定义了一个控件的属性名称与此控件属性名称相同,则在编译是会报错。
如:在工程中已经存在一个控件属性定义,而我们定义的控件属性中有与之相同的属性时
则编译会报错:
原本以为 declare-styleable的name与 attr name一起才构成一个属性
RoundProgress_roundColor,但实际有点坑啊!
在layout中使用
<com.xxx.views.RoundProgress android:id="@+id/roundProgress" android:layout_width="120dp" android:layout_height="120dp" app:round_color="#ff8569" app:round_progress_color="#ffecd5" app:round_width="6dp" app:text_isDisplayable="true" app:text_size="16sp"/>
2.圆形渐变
颜色实现:
@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 int radius = (int) (centre - roundWidth / 2); //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 SweepGradient sweepGradient = new SweepGradient(radius, radius, new int[]{Color.parseColor("#ff0000"), Color.parseColor("#00ff00")}, null); paint.setShader(sweepGradient); //设置渐变颜色 canvas.rotate(-90, centre, centre); //SweepGradient默认是从3点钟位置开始渐变的,为了让它从12点钟位置开始渐变所以将画布旋转-90° canvas.drawCircle(centre, centre, radius, paint); //画出圆环 ... }