package com.lcjian.library.widget;
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import android.content.Context;
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import android.content.res.TypedArray;
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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.drawable.BitmapDrawable;
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import android.graphics.drawable.Drawable;
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import android.graphics.drawable.NinePatchDrawable;
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import android.util.AttributeSet;
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import android.widget.ImageView;
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import com.lcjian.lcjianlibrary.R;
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/**
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* Created by weikou2015 on 2018/6/22.
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*/
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public class RoundImageView extends ImageView {
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private int mBorderThickness = 0;
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private Context mContext;
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private int defaultColor = 0xFFFFFFFF;
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// 如果只有其中一个有值，则只画一个圆形边框
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private int mBorderOutsideColor = 0;//图片的外边界
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private int mBorderInsideColor = 0;//图片的内边界
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// 控件默认长、宽
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private int defaultWidth = 0;
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private int defaultHeight = 0;
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public RoundImageView(Context context) {
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super(context);
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mContext = context;
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}
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public RoundImageView(Context context, AttributeSet attrs) {
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super(context, attrs);
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mContext = context;
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setCustomAttributes(attrs);
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}
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public RoundImageView(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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mContext = context;
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setCustomAttributes(attrs);
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}
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private void setCustomAttributes(AttributeSet attrs) {
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TypedArray a = mContext.obtainStyledAttributes(attrs, R.styleable.RoundImageView);
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//边界的宽度
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mBorderThickness = a.getDimensionPixelSize(
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R.styleable.RoundImageView_border_thickness, 0);
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//外边界的颜色
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mBorderOutsideColor = a.getColor(
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R.styleable.RoundImageView_border_outside_color, defaultColor);
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//内边界的颜色
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mBorderInsideColor = a.getColor(
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R.styleable.RoundImageView_border_inside_color, defaultColor);
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}
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@Override
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protected void onDraw(Canvas canvas) {
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Drawable drawable = getDrawable();
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if (drawable == null) {
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return;
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}
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if (getWidth() == 0 || getHeight() == 0) {
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return;
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}
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this.measure(0, 0);
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if (drawable.getClass() == NinePatchDrawable.class)
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return;
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Bitmap b = ((BitmapDrawable) drawable).getBitmap();
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Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);
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if (defaultWidth == 0) {
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defaultWidth = getWidth();
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}
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if (defaultHeight == 0) {
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defaultHeight = getHeight();
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}
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// 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）
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// if (defaultWidth != 0 && defaultHeight != 0) {
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// LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
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// defaultWidth, defaultHeight);
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// setLayoutParams(params);
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// }
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int radius = 0;
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if (mBorderInsideColor != defaultColor
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&& mBorderOutsideColor != defaultColor) {// 定义画两个边框，分别为外圆边框和内圆边框
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radius = (defaultWidth < defaultHeight ? defaultWidth
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: defaultHeight) / 2 - 2 * mBorderThickness;
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// 画内圆
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drawCircleBorder(canvas, radius + mBorderThickness / 2,
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mBorderInsideColor);
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// 画外圆
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drawCircleBorder(canvas, radius + mBorderThickness
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+ mBorderThickness / 2, mBorderOutsideColor);
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} else if (mBorderInsideColor != defaultColor
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&& mBorderOutsideColor == defaultColor) {// 定义画一个边框
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radius = (defaultWidth < defaultHeight ? defaultWidth
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: defaultHeight) / 2 - mBorderThickness;
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drawCircleBorder(canvas, radius + mBorderThickness / 2,
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mBorderInsideColor);
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} else if (mBorderInsideColor == defaultColor
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&& mBorderOutsideColor != defaultColor) {// 定义画一个边框
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radius = (defaultWidth < defaultHeight ? defaultWidth
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: defaultHeight) / 2 - mBorderThickness;
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drawCircleBorder(canvas, radius + mBorderThickness / 2,
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mBorderOutsideColor);
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} else {// 没有边框
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radius = (defaultWidth < defaultHeight ? defaultWidth
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: defaultHeight) / 2;
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}
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Bitmap roundBitmap = getCroppedRoundBitmap(bitmap, radius);
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canvas.drawBitmap(roundBitmap, defaultWidth / 2 - radius, defaultHeight
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/ 2 - radius, null);
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}
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/**
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* 获取裁剪后的圆形图片
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*
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* @param radius 半径
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*/
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public Bitmap getCroppedRoundBitmap(Bitmap bmp, int radius) {
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Bitmap scaledSrcBmp;
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int diameter = radius * 2;
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// 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
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int bmpWidth = bmp.getWidth();
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int bmpHeight = bmp.getHeight();
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int squareWidth = 0, squareHeight = 0;
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int x = 0, y = 0;
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Bitmap squareBitmap;
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if (bmpHeight > bmpWidth) {// 高大于宽
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squareWidth = squareHeight = bmpWidth;
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x = 0;
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y = (bmpHeight - bmpWidth) / 2;
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// 截取正方形图片
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squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth,
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squareHeight);
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} else if (bmpHeight < bmpWidth) {// 宽大于高
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squareWidth = squareHeight = bmpHeight;
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x = (bmpWidth - bmpHeight) / 2;
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y = 0;
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squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth,
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squareHeight);
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} else {
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squareBitmap = bmp;
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}
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if (squareBitmap.getWidth() != diameter
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|| squareBitmap.getHeight() != diameter) {
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scaledSrcBmp = Bitmap.createScaledBitmap(squareBitmap, diameter,
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diameter, true);
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} else {
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scaledSrcBmp = squareBitmap;
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}
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Bitmap output = Bitmap.createBitmap(scaledSrcBmp.getWidth(),
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scaledSrcBmp.getHeight(), Bitmap.Config.ARGB_8888);
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Canvas canvas = new Canvas(output);
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Paint paint = new Paint();
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Rect rect = new Rect(0, 0, scaledSrcBmp.getWidth(),
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scaledSrcBmp.getHeight());
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paint.setAntiAlias(true);
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paint.setFilterBitmap(true);
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paint.setDither(true);
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canvas.drawARGB(0, 0, 0, 0);
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canvas.drawCircle(scaledSrcBmp.getWidth() / 2,
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scaledSrcBmp.getHeight() / 2, scaledSrcBmp.getWidth() / 2,
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paint);
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paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
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canvas.drawBitmap(scaledSrcBmp, rect, rect, paint);
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// bitmap回收(recycle导致在布局文件XML看不到效果)
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// bmp.recycle();
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// squareBitmap.recycle();
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// scaledSrcBmp.recycle();
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bmp = null;
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squareBitmap = null;
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scaledSrcBmp = null;
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return output;
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}
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/**
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* 边缘画圆
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*/
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private void drawCircleBorder(Canvas canvas, int radius, int color) {
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Paint paint = new Paint();
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/* 去锯齿 */
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paint.setAntiAlias(true);
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paint.setFilterBitmap(true);
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paint.setDither(true);
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paint.setColor(color);
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/* 设置paint的 style 为STROKE：空心 */
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paint.setStyle(Paint.Style.STROKE);
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/* 设置paint的外框宽度 */
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paint.setStrokeWidth(mBorderThickness);
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canvas.drawCircle(defaultWidth / 2, defaultHeight / 2, radius, paint);
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}
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}
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