Android自定義圓環進度條

package com.example.carlos.myapplication;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;
/**


Created by carlos on 2015/10/24.
*/
public class CustomView extends View {
 private Paint mPaintBackCircle;
 private Paint mPaintFrontCircle;
 private Paint mPaintText;
 private float mStrokeWith =50;
 private float mHalfStrokeWith = mStrokeWith/2;
 private float mX = 200 + mHalfStrokeWith;
 private float mY = 200 + mHalfStrokeWith;
 private float mRadius = 200;
 private RectF mRectF;
 private int mProgess;
 public CustomView(Context context) {
 super(context);
 init();

 }
 public CustomView(Context context, AttributeSet attrs) {
 super(context, attrs);
 init();

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

 }
 private void init(){
 mPaintBackCircle = new Paint();
 mPaintBackCircle.setColor(Color.BLUE);
 mPaintBackCircle.setAntiAlias(true);
 mPaintBackCircle.setStyle(Paint.Style.STROKE);
 mPaintBackCircle.setStrokeWidth(mStrokeWith);
 mPaintFrontCircle = new Paint();
 mPaintFrontCircle.setColor(Color.YELLOW);
 mPaintFrontCircle.setAntiAlias(true);
 mPaintFrontCircle.setStyle(Paint.Style.STROKE);
 mPaintFrontCircle.setStrokeWidth(mStrokeWith);
 mPaintText = new Paint();
 mPaintText.setColor(Color.RED);
 mPaintText.setAntiAlias(true);
 mPaintText.setTextSize(50);
 mPaintText.setTextAlign(Paint.Align.CENTER);
 mRectF = new RectF(mHalfStrokeWith,mHalfStrokeWith,mRadius*2 + mHalfStrokeWith,mRadius*2 + mHalfStrokeWith);
 mProgess =75;

 }
 @Override
 protected void onDraw(Canvas canvas) {
 super.onDraw(canvas);
 canvas.drawCircle(mX, mY, mRadius, mPaintBackCircle);
 canvas.drawArc(mRectF,0,270,false,mPaintFrontCircle);
 canvas.drawText(mProgess+"%",mX,mY,mPaintText);

 }
}</pre>