/** * Created by jiangzn on 17/2/3. */public class RoundLightBarView extends ImageView {  private int mTotalWidth, mTotalHeight;  private int mCenterX, mCenterY;  //底色畫筆  private Paint mCirclePaint;  //進(jìn)度條畫筆  private Paint mProgressPaint;  //圓點(diǎn)畫筆  private Paint mbitmapPaint;  private Matrix mMatrix; // 矩陣,用于對(duì)圖片進(jìn)行一些操作  private float[] pos;   // 當(dāng)前點(diǎn)的實(shí)際位置  private float[] tan;   // 當(dāng)前點(diǎn)的tangent值,用于計(jì)算圖片所需旋轉(zhuǎn)的角度    private int mCircleR;    private Context mContext;  //距離外圍的邊距  private float interval ;   private int startAngle = 1;   //球  private Bitmap mLititleBitmap; // 圓點(diǎn)圖片   public RoundLightBarView(Context context, AttributeSet attrs, int defStyleAttr) {    super(context, attrs, defStyleAttr);   }   public RoundLightBarView(Context context, AttributeSet attrs) {    super(context, attrs);    mContext = context;    interval = DensityUtils.px2dip(mContext, 50);    //初始化畫筆    initPaint();    //初始化bitmap    initBitmap();  }   private void initBitmap() {    mMatrix=new Matrix();    pos = new float[2];    tan = new float[2];    mLititleBitmap= ((BitmapDrawable) getResources()        .getDrawable(R.mipmap.white_round))        .getBitmap();  }   private void initPaint() {    //畫黑底的深色圓畫筆    mCirclePaint = new Paint();    //抗鋸齒    mCirclePaint.setAntiAlias(true);    // 防抖動(dòng)    mCirclePaint.setDither(true);    // 開(kāi)啟圖像過(guò)濾，對(duì)位圖進(jìn)行濾波處理。    mCirclePaint.setFilterBitmap(true);    mCirclePaint.setColor(Color.BLACK);    //空心圓    mCirclePaint.setStyle(Paint.Style.STROKE);    //圓半徑    mCircleR = DensityUtils.px2dip(mContext, 20);    mCirclePaint.setStrokeWidth(mCircleR);     //畫彩色圓弧的畫筆    mProgressPaint = new Paint();    //抗鋸齒    mProgressPaint.setAntiAlias(true);    // 防抖動(dòng)    mProgressPaint.setDither(true);    // 開(kāi)啟圖像過(guò)濾，對(duì)位圖進(jìn)行濾波處理。    mProgressPaint.setFilterBitmap(true);    mProgressPaint.setColor(Color.BLUE);    //空心圓    mProgressPaint.setStyle(Paint.Style.STROKE);    //設(shè)置筆刷樣式為原型    mProgressPaint.setStrokeCap(Paint.Cap.ROUND);    //設(shè)置圓弧粗    mProgressPaint.setStrokeWidth(mCircleR);    //將繪制的內(nèi)容顯示在第一次繪制內(nèi)容之上    mProgressPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_ATOP));      //圓點(diǎn)畫筆    mbitmapPaint = new Paint();    mbitmapPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_ATOP));    mbitmapPaint.setStyle(Paint.Style.FILL);    mbitmapPaint.setAntiAlias(true);   }   @Override  protected void onDraw(Canvas canvas) {    super.onDraw(canvas);    //canvas去鋸齒    canvas.setDrawFilter(        new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG));    //畫底色圓    canvas.drawCircle(mCenterX, mCenterY, mCenterX - mCircleR - interval, mCirclePaint);    //畫進(jìn)度條    int colorSweep[] = {Color.TRANSPARENT, Color.parseColor("#3bbaea"),Color.parseColor("#7ac9d3"),Color.parseColor("#7cc9d0")};     //設(shè)置漸變色    sweepGradient = new SweepGradient(mCenterX, mCenterY, colorSweep, null);    //按照?qǐng)A心旋轉(zhuǎn)    Matrix matrix = new Matrix();    matrix.setRotate(startAngle, mCenterX, mCenterY);    sweepGradient.setLocalMatrix(matrix);     mProgressPaint.setShader(sweepGradient);     canvas.drawArc(        new RectF(0 + mCircleR + interval, 0 + mCircleR + interval,            mTotalWidth - mCircleR - interval, mTotalHeight - mCircleR - interval),        2 + startAngle, 350, false, mProgressPaint);     startAngle++;    if (startAngle == 360) {      startAngle = 1;    }     //繪制白色小星星    Path orbit = new Path();    //通過(guò)Path類畫一個(gè)90度（180―270）的內(nèi)切圓弧路徑    orbit.addArc(        new RectF(0 + mCircleR + interval, 0 + mCircleR + interval,            mTotalWidth - mCircleR - interval, mTotalHeight - mCircleR - interval)        , 2 + startAngle, 350);    // 創(chuàng)建 PathMeasure    PathMeasure measure = new PathMeasure(orbit, false);    measure.getPosTan(measure.getLength() * 1, pos, tan);    mMatrix.reset();    mMatrix.postScale(2,2);    mMatrix.postTranslate(pos[0] - mLititleBitmap.getWidth() , pos[1] - mLititleBitmap.getHeight() );  // 將圖片繪制中心調(diào)整到與當(dāng)前點(diǎn)重合    canvas.drawBitmap(mLititleBitmap, mMatrix, mbitmapPaint);//繪制球    mbitmapPaint.setColor(Color.WHITE);    //繪制實(shí)心小圓圈    canvas.drawCircle(pos[0], pos[1], 5, mbitmapPaint);     //啟動(dòng)繪制    postInvalidateDelayed(10);  }   SweepGradient sweepGradient;   @Override  protected void onSizeChanged(int w, int h, int oldw, int oldh) {    super.onSizeChanged(w, h, oldw, oldh);    mTotalWidth = w;    mTotalHeight = h;    mCenterX = mTotalWidth / 2;    mCenterY = mTotalHeight / 2;    } }

 // 創(chuàng)建 PathMeasure    PathMeasure measure = new PathMeasure(orbit, false);    measure.getPosTan(measure.getLength() * 1, pos, tan);    mMatrix.reset();    mMatrix.postScale(2,2);    mMatrix.postTranslate(pos[0] - mLititleBitmap.getWidth() , pos[1] - mLititleBitmap.getHeight() );  // 將圖片繪制中心調(diào)整到與當(dāng)前點(diǎn)重合    canvas.drawBitmap(mLititleBitmap, mMatrix, mbitmapPaint);//繪制球    mbitmapPaint.setColor(Color.WHITE);    //繪制實(shí)心小圓圈    canvas.drawCircle(pos[0], pos[1], 5, mbitmapPaint);