自定义圆形图片

package com.meg7.widget;import com.example.testy.R;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.PorterDuff.Mode;import android.graphics.PorterDuffXfermode;import android.graphics.Rect;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.graphics.drawable.NinePatchDrawable;import android.util.AttributeSet;import android.widget.ImageView;/** * 圆形ImageView，可设置最多两个宽度不同且颜色不同的圆形边框。 * * @author Alan */public class dsads extends ImageView { private int mBorderThickness = 0; private Context mContext; private int defaultColor = 0xFFFFFFFF; // 如果只有其中一个有值，则只画一个圆形边框 private int mBorderOutsideColor = 0; private int mBorderInsideColor = 0; // 控件默认长、宽 private int defaultWidth = 0; private int defaultHeight = 0; public dsads(Context context) {  super(context);  mContext = context; } public dsads(Context context, AttributeSet attrs) {  super(context, attrs);  mContext = context;  setCustomAttributes(attrs); } public dsads(Context context, AttributeSet attrs, int defStyle) {  super(context, attrs, defStyle);  mContext = context;  setCustomAttributes(attrs); } private void setCustomAttributes(AttributeSet attrs) {// TypedArray a = mContext.obtainStyledAttributes(attrs,// R.styleable.roundedimageview);// mBorderThickness = a.getDimensionPixelSize(// R.styleable.roundedimageview_border_thickness, 0);// mBorderOutsideColor = a// .getColor(R.styleable.roundedimageview_border_outside_color,// defaultColor);// mBorderInsideColor = a.getColor(// R.styleable.roundedimageview_border_inside_color, defaultColor); } @Override protected void onDraw(Canvas canvas) {  Drawable drawable = getDrawable();  if (drawable == null) {   return;  }  if (getWidth() == 0 || getHeight() == 0) {   return;  }  this.measure(0, 0);  if (drawable.getClass() == NinePatchDrawable.class)   return;  //BitmapDrawable b=((BitmapDrawable)drawable)  Bitmap b = ((BitmapDrawable) drawable).getBitmap();  Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);  if (defaultWidth == 0) {   defaultWidth = getWidth();  }  if (defaultHeight == 0) {   defaultHeight = getHeight();  }  // 保证重新读取图片后不会因为图片大小而改变控件宽、高的大小（针对宽、高为wrap_content布局的imageview，但会导致margin无效）  // if (defaultWidth != 0 && defaultHeight != 0) {  // LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(  // defaultWidth, defaultHeight);  // setLayoutParams(params);  // }  int radius = 0;  if (mBorderInsideColor != defaultColor    && mBorderOutsideColor != defaultColor) {// 定义画两个边框，分别为外圆边框和内圆边框   radius = (defaultWidth < defaultHeight ? defaultWidth     : defaultHeight) / 2 - 2 * mBorderThickness;   // 画内圆   drawCircleBorder(canvas, radius + mBorderThickness / 2,     mBorderInsideColor);   // 画外圆   drawCircleBorder(canvas, radius + mBorderThickness     + mBorderThickness / 2, mBorderOutsideColor);  } else if (mBorderInsideColor != defaultColor    && mBorderOutsideColor == defaultColor) {// 定义画一个边框   radius = (defaultWidth < defaultHeight ? defaultWidth     : defaultHeight) / 2 - mBorderThickness;   drawCircleBorder(canvas, radius + mBorderThickness / 2,     mBorderInsideColor);  } else if (mBorderInsideColor == defaultColor    && mBorderOutsideColor != defaultColor) {// 定义画一个边框   radius = (defaultWidth < defaultHeight ? defaultWidth     : defaultHeight) / 2 - mBorderThickness;   drawCircleBorder(canvas, radius + mBorderThickness / 2,     mBorderOutsideColor);  } else {// 没有边框   radius = (defaultWidth < defaultHeight ? defaultWidth     : defaultHeight) / 2;  }  Bitmap roundBitmap = getCroppedRoundBitmap(bitmap, radius);  canvas.drawBitmap(roundBitmap, defaultWidth / 2 - radius, defaultHeight    / 2 - radius, null); } /**  * 获取裁剪后的圆形图片  *  * @param radius  * 半径  */ public Bitmap getCroppedRoundBitmap(Bitmap bmp, int radius) {  Bitmap scaledSrcBmp;  int diameter = radius * 2;  // 为了防止宽高不相等，造成圆形图片变形，因此截取长方形中处于中间位置最大的正方形图片  int bmpWidth = bmp.getWidth();  int bmpHeight = bmp.getHeight();  int squareWidth = 0, squareHeight = 0;  int x = 0, y = 0;  Bitmap squareBitmap;  if (bmpHeight > bmpWidth) {// 高大于宽   squareWidth = squareHeight = bmpWidth;   x = 0;   y = (bmpHeight - bmpWidth) / 2;   // 截取正方形图片   squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth,     squareHeight);  } else if (bmpHeight < bmpWidth) {// 宽大于高   squareWidth = squareHeight = bmpHeight;   x = (bmpWidth - bmpHeight) / 2;   y = 0;   squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth,     squareHeight);  } else {   squareBitmap = bmp;  }  if (squareBitmap.getWidth() != diameter    || squareBitmap.getHeight() != diameter) {   scaledSrcBmp = Bitmap.createScaledBitmap(squareBitmap, diameter,     diameter, true);  } else {   scaledSrcBmp = squareBitmap;  }  Bitmap output = Bitmap.createBitmap(scaledSrcBmp.getWidth(),    scaledSrcBmp.getHeight(), Config.ARGB_8888);  Canvas canvas = new Canvas(output);  Paint paint = new Paint();  Rect rect = new Rect(0, 0, scaledSrcBmp.getWidth(),    scaledSrcBmp.getHeight());  paint.setAntiAlias(true);  paint.setFilterBitmap(true);  paint.setDither(true);  canvas.drawARGB(0, 0, 0, 0);  canvas.drawCircle(scaledSrcBmp.getWidth() / 2,    scaledSrcBmp.getHeight() / 2, scaledSrcBmp.getWidth() / 2,    paint);  paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));  canvas.drawBitmap(scaledSrcBmp, rect, rect, paint);  // bitmap回收(recycle导致在布局文件XML看不到效果)  // bmp.recycle();  // squareBitmap.recycle();  // scaledSrcBmp.recycle();  bmp = null;  squareBitmap = null;  scaledSrcBmp = null;  return output; } /**  * 边缘画圆  */ private void drawCircleBorder(Canvas canvas, int radius, int color) {  Paint paint = new Paint();  /* 去锯齿 */  paint.setAntiAlias(true);  paint.setFilterBitmap(true);  paint.setDither(true);  paint.setColor(color);  /* 设置paint的　style　为STROKE：空心 */  paint.setStyle(Paint.Style.STROKE);  /* 设置paint的外框宽度 */  paint.setStrokeWidth(mBorderThickness);  canvas.drawCircle(defaultWidth / 2, defaultHeight / 2, radius, paint); }}