一个自定义的圆形进度条

最近在项目总会用到一些圆形进度条，所以就记录下来 供以后可用

首先新建一个CircleProgressBar 继承View

package com.example.liwenjie.firstapp.viewbase;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;

/**
 * Created by liwenjie on 2016/3/10 17:22
 */
public class CircleProgressBar extends View {
    //设置最大值
    private int maxProgress;
    //设置进度值
    private int progress;
    //设置线宽
    private int progressStrokeWidth;
    //设置线条颜色值
    private int progressColor;
    //画圆所在的矩形
    RectF oval;
    Paint paint;
    public CircleProgressBar(Context context) {
        super(context);
    }

    public CircleProgressBar(Context context, AttributeSet attrs) {
        super(context, attrs);
        oval = new RectF();
        paint = new Paint();
    }

    public CircleProgressBar(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        super.onDraw(canvas);
        int width = this.getWidth();
        int height = this.getHeight();
        // 获取圆心的坐标
        int centre = width / 2;

        if (width != height) {
            int min = Math.min(width, height);
            width = min;
            height = min;
        }

        paint.setAntiAlias(true); // 设置画笔为抗锯齿
        paint.setColor(Color.WHITE); // 设置画笔颜色
        canvas.drawColor(Color.TRANSPARENT); // 白色背景
        paint.setStrokeWidth(progressStrokeWidth); // 线宽
        paint.setStyle(Paint.Style.STROKE);

        oval.left = progressStrokeWidth / 2; // 左上角x
        oval.top = progressStrokeWidth / 2; // 左上角y
        oval.right = width - progressStrokeWidth / 2; // 左下角x
        oval.bottom = height - progressStrokeWidth / 2; // 右下角y

        canvas.drawArc(oval, -90, 360, false, paint); // 绘制白色圆圈，即进度条背景
        //Color.rgb(81, 164, 247)
        paint.setColor(progressColor);
        canvas.drawArc(oval, -90, ((float) progress / maxProgress) * 360,
                false, paint); // 绘制进度圆弧，这里是蓝色
        /*以下是在圆圈中间写字，看情况添加*/
      /*
       paint.setStrokeWidth(1);
       String text = "√";//progress + "%";
        int textHeight = height / 2;
        paint.setTextSize(textHeight);
        int textWidth = (int) paint.measureText(text, 0, text.length());
        paint.setStyle(Paint.Style.FILL);
        canvas.drawText(text, centre - textWidth / 2, centre + textHeight/4,paint);*/

    }

    public int getMaxProgress() {
        return maxProgress;
    }

    public void setMaxProgress(int maxProgress) {
        this.maxProgress = maxProgress;
    }

    public int getProgress() {
        return progress;
    }

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

    public int getProgressStrokeWidth() {
        return progressStrokeWidth;
    }

    public void setProgressStrokeWidth(int progressStrokeWidth) {
        this.progressStrokeWidth = progressStrokeWidth;
    }
    /**
     * 非ＵＩ线程调用
     */
    public void setProgressNotInUiThread(int progress) {
        this.progress = progress;
        this.postInvalidate();
    }

    public int getProgressColor() {
        return progressColor;
    }

    public void setProgressColor(int progressColor) {
        this.progressColor = progressColor;
    }
}