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@@ -0,0 +1,120 @@
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+package com.usai.redant.rautils.roundCornerImageView;
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+
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+import android.content.Context;
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+import android.graphics.Bitmap;
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+import android.graphics.Canvas;
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+import android.graphics.Paint;
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+import android.graphics.PorterDuff;
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+import android.graphics.PorterDuffXfermode;
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+import android.graphics.Rect;
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+import android.graphics.RectF;
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+import android.graphics.drawable.BitmapDrawable;
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+import android.graphics.drawable.Drawable;
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+import android.support.annotation.Nullable;
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+import android.util.AttributeSet;
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+
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+public class RoundCornerImageView extends android.support.v7.widget.AppCompatImageView {
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+
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+ private int roundCorner;
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+
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+ public RoundCornerImageView(Context context) {
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+ this(context,null);
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+ }
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+
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+ public RoundCornerImageView(Context context, @Nullable AttributeSet attrs) {
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+ this(context, attrs,0);
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+ }
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+
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+ public RoundCornerImageView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
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+ super(context, attrs, defStyleAttr);
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+
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+ init();
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+ }
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+
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+ public void setRoundCorner(int roundCorner) {
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+ this.roundCorner = roundCorner;
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+
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+ postInvalidate();
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+ }
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+
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+ public int getRoundCorner() {
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+ return roundCorner;
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+ }
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+
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+ Paint mPaint;
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+
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+ private void init() {
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+ mPaint = new Paint();
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+ mPaint.setAntiAlias(true);
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+ mPaint.setStyle(Paint.Style.FILL);
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+ }
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+
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+ @Override
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+ protected void onDraw(Canvas canvas) {
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+
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+ // 可操作区域
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+ int width = getWidth();
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+ int height = getHeight();
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+ RectF rect = new RectF(0,0,width,height);
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+
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+
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+ // 原始图片
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+ Drawable drawable = getDrawable();
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+ Bitmap src = ((BitmapDrawable)drawable).getBitmap();
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+
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+ // 先缩放原图，适配View大小
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+ Bitmap scaleSrc = scaleBitmap(src, width, height);
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+
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+ // 创建Mask
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+ Bitmap mask=Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
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+ Canvas maskCanvas=new Canvas(mask);
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+ maskCanvas.drawRoundRect(rect,roundCorner,roundCorner,mPaint);
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+
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+ /**
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+ *
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+ * 产生新的layer。新layer相当于一个区域为传递的bounds的“新画布”，它关联一个bitmap（an offscreen bitmap，它是完全透明的），
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+ * 之后的绘制操作都在此bitmap上执行。每个layer可以看做一个独立的画布，所有layer形成一个栈，栈底是初始的layer。
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+ * 每次在栈顶产生的新layer，任何时候都在栈顶的layer上执行绘图，
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+ * 调用restoreToCount()后栈顶layer出栈，其对应的bitmap的内容合并（进行像素的argb混合）到之前layer中。
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+ *
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+ * */
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+// int sc = canvas.saveLayer(rect,mPaint);
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+
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+ /**
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+ *
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+ * 根据saveLayer方法的文档介绍，可以去掉saveLayer()/restoreToCount()的调用，
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+ * 只需要在onDraw()中开启硬件加速就可以实现相同的目标了，性能会更好
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+ *
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+ * */
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+ setLayerType(LAYER_TYPE_HARDWARE, mPaint); // 开启硬件加速
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+
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+ canvas.drawBitmap(mask, 0, 0, mPaint);
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+
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+ mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
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+
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+ canvas.drawBitmap(scaleSrc, 0, 0, mPaint);
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+
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+ mPaint.setXfermode(null);
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+
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+// canvas.restoreToCount(sc);
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+
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+ }
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+
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+ private Bitmap scaleBitmap(Bitmap src, int width, int height) {
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+
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+ if (src == null || width <= 0 || height <= 0) {
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+ return src;
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+ }
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+
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+ Rect rct = new Rect(0,0,width,height);
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+
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+ Bitmap scaleSrc = Bitmap.createBitmap(width, height, src.getConfig());
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+
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+ Canvas scaleCanvas = new Canvas(scaleSrc);
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+
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+ scaleCanvas.drawBitmap(src,null,rct,mPaint);
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+
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+ return scaleSrc;
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+ }
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+
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+}
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Pen Li