自定义view圆弧家百分比

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//新建的类的内容

package com.example.baifenbiyuanquan.view;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.RectF;import android.os.Build;import android.support.annotation.Nullable;import android.support.annotation.RequiresApi;import android.util.AttributeSet;import android.view.View;/** * author:Created by Chenxu on 2017/11/29. */public class yuan extends View implements Runnable{    private Paint inpaint;    /**     * 定义一个初始进度值     */    private int progress = 0;    /**     * 加载总进度     */    private int totalProgress = 100;    /**     * 内部圆环半斤     */    private int innerCircleRadius = 100;    /**     * 默认的外部圆环宽度     */    private int outCircleWidth = 20;    private Paint outpaint;    private Paint textpaint;    public yuan(Context context) {        this(context,null);    }    public yuan(Context context, @Nullable AttributeSet attrs) {        this(context, attrs,0);    }    public yuan(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init();    }    private void init(){        //内部圆        inpaint = new Paint();        inpaint.setAntiAlias(true);        //外部弧度        outpaint = new Paint();        outpaint.setAntiAlias(true);        //文字属性        textpaint = new Paint();        //设置画笔颜色        inpaint.setColor(Color.parseColor("#D5982E"));        //设置是否填充圆        outpaint.setStyle(Paint.Style.STROKE);        //设置描边宽度(圆环宽度)        outpaint.setStrokeWidth(outCircleWidth);        //设置文字大小        textpaint.setTextSize(35);    }    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        // 画圆        canvas.drawCircle(getWidth()/2,getHeight()/2,innerCircleRadius,inpaint);        //画外围弧度//        canvas.drawArc(getWidth() / 2 - innerCircleRadius,getHeight() / 2 - innerCircleRadius,getWidth() / 2 + innerCircleRadius,getHeight() / 2 + innerCircleRadius,-90,(progress * 360) / totalProgress,false,outpaint);        RectF oval=new RectF();                     //RectF对象        oval.left=getWidth()/2-100;                              //左边        oval.top=getHeight()/2-100;                                   //上边        oval.right=getWidth()/2+100;                             //右边        oval.bottom=getHeight()/2+100;                                //下边        canvas.drawArc(oval, -90, (progress*360)/100, false, outpaint);//        RectF rectF = new RectF();//        canvas.drawArc();        //绘制文本        String des = progress + "%";        //得到文字的宽度与高度        Paint.FontMetrics fm = new Paint.FontMetrics();        //得到文字的高度        int textHeight = (int)Math.ceil(fm.descent - fm.ascent);        //的到文字宽度        int textWidth = (int)textpaint.measureText(des,0,des.length());        canvas.drawText(des,getWidth()/2 - (textWidth / 2),getHeight() / 2 - (textHeight/2),textpaint);    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);        /**         * 测量三种模式         * 精确的         *         * 至多 :         *         * 不确定的 : 用的很少，一般会用到它         *         */        int widthMode = MeasureSpec.getMode(widthMeasureSpec);        int heightMode = MeasureSpec.getMode(heightMeasureSpec);        //得到控件的宽高        int widthSize = MeasureSpec.getSize(widthMeasureSpec);        int heightSize = MeasureSpec.getSize(heightMeasureSpec);        //定义变量记录控件的宽高        int width = 0;        int height = 0;        switch (widthMode){            case MeasureSpec.UNSPECIFIED:            {                //很少用            }            break;            case MeasureSpec.AT_MOST://match_parent            {                width = innerCircleRadius * 2 + outCircleWidth * 2;            }            break;            case MeasureSpec.EXACTLY://wrap_content            {                width = widthSize;//至多有多大            }            break;        }        switch (heightMode) {            case MeasureSpec.UNSPECIFIED: {                //很少用            }            break;            case MeasureSpec.AT_MOST://wrap_content            {                //精确模式                height = innerCircleRadius * 2 + outCircleWidth * 2;            }            break;            case MeasureSpec.EXACTLY://match_parent            {                height = heightSize;//至多有多大            }            break;        }        //必须调用，如果不调用的话，测量的这个高度会出现偏差        setMeasuredDimension(width,height);    }    public void run() {        while (true) {            if (progress < 100) {                progress++;                try {                    Thread.sleep(100);                } catch (InterruptedException e) {                    e.printStackTrace();                }                postInvalidate();            } else {                progress = 0;            }        }    }}

//Main里面的回调,执行线程,让百分比动起来

public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        yuan viewById = (yuan) findViewById(R.id.circleView);        new Thread(viewById).start();    }}

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