自定义圆角ImageVIew，支持加载网络图片

坑爹的UI出了一套列表效果图，图片要圆角显示，在网上随便找了圆角demo,加载本地图片资源没问题，但是当用xutils加载时，就蛋疼了，没效果，去看了下demo里的源码，2000多行，又是反射，又是杂七杂八的。干脆自己写一个  直接上码    package himan.xiao.yu.view;  import himan.xiao.yu.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.Color;  import android.graphics.Matrix;  import android.graphics.Paint;  import android.graphics.PorterDuff;  import android.graphics.PorterDuffXfermode;  import android.graphics.RectF;  import android.graphics.drawable.BitmapDrawable;  import android.graphics.drawable.Drawable;  import android.util.AttributeSet;  import android.widget.ImageView;  /**       * 图片圆角实现，支持xUtils       *        * @author Himan       */      public class CustomImageView extends ImageView {          private Paint paint;          private Paint paintBorder;          /** 圆角的幅度 **/          private float mRadius;          /** 是否是圆形 **/          private boolean mIsCircle;      public CustomImageView(final Context context) {          this(context, null);      }        public CustomImageView(Context context, AttributeSet attrs) {          this(context, attrs, R.attr.customImageViewStyle);      }        public CustomImageView(Context context, AttributeSet attrs, int defStyle) {          super(context, attrs, defStyle);          this.setScaleType(ScaleType.FIT_XY);          // 获取自定属性配置          TypedArray ta = context.obtainStyledAttributes(attrs,                  R.styleable.CustomImageView, defStyle, 0);          mRadius = ta.getDimension(R.styleable.CustomImageView_radius, 0);          mIsCircle = ta.getBoolean(R.styleable.CustomImageView_circle, false);          ta.recycle();          paint = new Paint();          paint.setAntiAlias(true);          paintBorder = new Paint();          paintBorder.setAntiAlias(true);      }                @Override      public void onDraw(Canvas canvas) {          // 去点padding值          int width = canvas.getWidth() - getPaddingLeft() - getPaddingRight();          int height = canvas.getHeight() - getPaddingTop() - getPaddingBottom();          // 获取iamgeView 中的drawable 并转成bitmap          Bitmap image = drawableToBitmap(getDrawable());          // 对获取到的bitmap 按照当前imageView的宽高进行缩放          Bitmap reSizeImage = reSizeImage(image, width, height);          // 判断当前需要绘制圆角还是圆          if (mIsCircle) {              canvas.drawBitmap(createCircleImage(reSizeImage, width, height),                  getPaddingLeft(), getPaddingTop(), null);        } else {          canvas.drawBitmap(createRoundImage(reSizeImage, width, height),                  getPaddingLeft(), getPaddingTop(), null);      }  }    /** 绘制圆角 **/  private Bitmap createRoundImage(Bitmap source, int width, int height) {      final Paint paint = new Paint();      paint.setAntiAlias(true);      Bitmap target = Bitmap.createBitmap(width, height, Config.ARGB_8888);      Canvas canvas = new Canvas(target);      RectF rect = new RectF(0, 0, width, height);      canvas.drawRoundRect(rect, mRadius, mRadius, paint);      // 关键代码 设置画笔的Mode 设置为获取交集       paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));      canvas.drawBitmap(source, 0, 0, paint);      return target;  }    private Bitmap createCircleImage(Bitmap source, int width, int height) {      final Paint paint = new Paint();      paint.setAntiAlias(true);      Bitmap target = Bitmap.createBitmap(width, height, Config.ARGB_8888);      Canvas canvas = new Canvas(target);      canvas.drawCircle(width / 2, height / 2, Math.min(width, height) / 2,              paint);      paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));      canvas.drawBitmap(source, 0, 0, paint);      return target;  }    @Override  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {      int width = MeasureSpec.getSize(widthMeasureSpec);      int height = MeasureSpec.getSize(heightMeasureSpec);      setMeasuredDimension(width, height);  }    /**   * drawable转bitmap   *    * @param drawable   * @return   */  private Bitmap drawableToBitmap(Drawable drawable) {      if (drawable == null) {          return null;      } else if (drawable instanceof BitmapDrawable) {          return ((BitmapDrawable) drawable).getBitmap();      }      Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicHeight(),              drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);      Canvas canvas = new Canvas(bitmap);      drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());      drawable.draw(canvas);      return bitmap;  }    /**   * 重设Bitmap的宽高   *    * @param bitmap   * @param newWidth   * @param newHeight   * @return   */  private Bitmap reSizeImage(Bitmap bitmap, int newWidth, int newHeight) {      int width = bitmap.getWidth();      int height = bitmap.getHeight();      // 计算出缩放比      float scaleWidth = ((float) newWidth) / width;      float scaleHeight = ((float) newHeight) / height;      // 矩阵缩放bitmap      Matrix matrix = new Matrix();      matrix.postScale(scaleWidth, scaleHeight);      return Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);      }    }

attr中的resources

<declare-styleable name="Theme">      <attr name="customImageViewStyle" format="reference" />  </declare-styleable>  <declare-styleable name="CustomImageView">      <attr name="circle" format="boolean" />      <attr name="radius" format="dimension" />  </declare-styleable>

源码