/* * Copyright (c) 2018 denua. */ package cn.denua.v2ex.widget; import android.content.Context; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.ColorFilter; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.PorterDuff; import android.graphics.PorterDuffXfermode; import android.graphics.Rect; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import android.support.annotation.Nullable; import android.support.v7.widget.AppCompatImageView; import android.util.AttributeSet; /* * 圆形的 ImageView * * @author denua * @date 2018/10/31 12 */ public class CircleImageView extends AppCompatImageView { private float mWidth; private float mHeight; private float mRadius = 0.5f; private Paint mPaint = new Paint(); private Matrix mMatrix; public CircleImageView(Context context) { this(context, null); } public CircleImageView(Context context, AttributeSet attrs) { super(context, attrs, 0); } public CircleImageView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); mPaint.setAntiAlias(true); mMatrix = new Matrix(); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); mWidth = getMeasuredWidth(); mHeight = getMeasuredHeight(); mRadius = Math.min(mWidth, mHeight)/2; } @Override protected void onDraw(Canvas canvas) { Drawable drawable = getDrawable(); if ((drawable instanceof BitmapDrawable)) { Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap(); Bitmap b = getCircleBitmap(bitmap); final Rect rectSrc = new Rect(0, 0, b.getWidth(), b.getHeight()); final Rect rectDest = new Rect(0,0, getWidth(), getHeight()); mPaint.reset(); canvas.drawBitmap(b, rectSrc, rectDest, mPaint); mPaint.reset(); } else { super.onDraw(canvas); } } private Bitmap getCircleBitmap(Bitmap bitmap) { Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(output); Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight()); mPaint.setAntiAlias(true); canvas.drawARGB(0, 0, 0, 0); int x = bitmap.getWidth(); canvas.drawCircle(x / 2, x / 2, x/2, mPaint); mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)); canvas.drawBitmap(bitmap, rect, rect, mPaint); return output; } @Override public void setColorFilter(@Nullable ColorFilter colorFilter) { } }