在Android开发中通过自定义View实现一个圆形进度条

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首先来看看自己定义的View

package cn.easymobi.application.bell.common;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;public class ProgressView extends View{  private float fArcNum;  private float fMax;  private float density;  public float getDensity() {    return density;  }  public void setDensity(float density) {    this.density = density;  }  public ProgressView(Context context) {    super(context);  }  public ProgressView(Context context,AttributeSet attrs) {    super(context,attrs);  }  protected void onDraw(Canvas canvas) {    // TODO Auto-generated method stub    super.onDraw(canvas);    Paint paint=new Paint();    if(fArcNum>0)      {      paint.setColor(Color.GRAY);      paint.setFlags(Paint.ANTI_ALIAS_FLAG);      canvas.drawCircle(40*density/2, 40*density/2, 40*density/2, paint);    }    paint.setColor(Color.YELLOW);    paint.setFlags(Paint.ANTI_ALIAS_FLAG);    //paint.setStrokeWidth(2);    RectF rect=new RectF(0, 0, 40*density, 40*density);    canvas.drawArc(rect, -90, fArcNum,true, paint);    paint.setColor(Color.BLACK);    paint.setFlags(Paint.ANTI_ALIAS_FLAG);    canvas.drawCircle(40*density/2, 40*density/2, 40*density/2-5, paint);  }  public void setProgress(float num) {    fArcNum = (num/fMax) * 360;  }  public float getfArcNum() {    return fArcNum;  }  public void setfArcNum(float fArcNum) {    this.fArcNum = fArcNum;  }  public float getfMax() {    return fMax;  }  public void setfMax(float fMax) {    this.fMax = fMax;  }}