android 自定义扇形控件,Android自定义控件之圆形进度条ImageView

From：http://blog.youkuaiyun.com/xiadik/article/details/41648181

packagecom.wangran.beautiful_girl_show.view;importcom.wangran.beautiful_girl_show.view.photoview.PhotoView;importandroid.content.Context;importandroid.graphics.Canvas;importandroid.graphics.Color;importandroid.graphics.Paint;importandroid.graphics.RectF;importandroid.graphics.Typeface;importandroid.util.AttributeSet;/*** 可显示进度的ImageView

*@author夏小川*/

public class ProgressImageView extendsImageView {private static final String TAG = "ProgressImageView";privateContext mContext;public static final int FONT_SIZE = 14;public static final int ROUND_WIDTH = 50;public static final int STROKE_WIDTH = 7;private intmFontSize;private intmRoundWidth;private intmStrokeWidth;privatePaint mPaint;private booleanmShowProgress;private intmProgress;private floatmTextY;private intmCenterX;private intmCenterY;private intmRadius;privateRectF mOval;publicProgressImageView(Context context) {super(context);

mContext=context;

}publicProgressImageView(Context context, AttributeSet attrs) {super(context, attrs);

mContext=context;

}private voidinit() {float scale =mContext.getResources().getDisplayMetrics().density;

mFontSize= (int) (FONT_SIZE *scale);

mRoundWidth= (int) (ROUND_WIDTH *scale);

mStrokeWidth= (int) (STROKE_WIDTH *scale);

mPaint= newPaint();

mPaint.setAntiAlias(true);

mPaint.setTextSize(mFontSize);

mCenterX= getWidth() / 2;

mCenterY= getHeight() / 2;

mRadius= mRoundWidth / 2;

mTextY= mCenterY + mFontSize * 11.0f / 28;

mOval= new RectF(mCenterX - mRadius, mCenterY -mRadius, mCenterX+ mRadius, mCenterY +mRadius);

}public voidonDraw(Canvas canvas) {if(mShowProgress) {if (mCenterX == 0 || mCenterY == 0) {

init();

}//画最外层的大圆环

mPaint.setColor(Color.DKGRAY);

mPaint.setStyle(Paint.Style.STROKE);

mPaint.setStrokeWidth(mStrokeWidth);

canvas.drawCircle(mCenterX, mCenterY, mRadius, mPaint);//画进度百分比

mPaint.setStrokeWidth(0);

mPaint.setColor(Color.WHITE);

mPaint.setTypeface(Typeface.MONOSPACE);

mPaint.setTextAlign(Paint.Align.CENTER);

String progressStr= mProgress + "%";

canvas.drawText(progressStr, mCenterX, mTextY, mPaint);//画圆环的进度

mPaint.setStrokeWidth(mStrokeWidth);

mPaint.setColor(Color.WHITE);

canvas.drawArc(mOval,0, 360 * mProgress / 100, false, mPaint);

}else{super.onDraw(canvas);

}

}public voidstartProgress() {

mShowProgress= true;

setProgress(0);

}public void setProgress(intprogress) {if(mShowProgress) {

mProgress=progress;

invalidate();

}

}public voidcloseProgress() {

mShowProgress= false;

}

}