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Android ImageView部分圆图处理组件 xutils兼容问题

发表于: 2016-05-05   作者:cgq1030699125   来源:转载   浏览:
摘要: 我用的是一个RoundImageView.java自定义圆图组件:publicclassRoundImageViewextendsImageView{ privateintmBorderThickness=0; privateContextmContext; privateintdefaultColor=0xFFFFFFFF; //如果只有其中一个有值,则只画一个圆形边框 privateintm

我用的是一个RoundImageView.java自定义圆图组件:

public class RoundImageView 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 RoundImageView(Context context) {
        super(context);
        mContext = context;
    }

    public RoundImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
        mContext = context;
        setCustomAttributes(attrs);
    }

    public RoundImageView(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);
    }

    @SuppressLint("DrawAllocation")
    @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;
        Bitmap b = null;
        if (drawable instanceof BitmapDrawable) {
            b = ((BitmapDrawable) drawable).getBitmap();
        } else if (drawable instanceof AsyncDrawable) {
            //添加这个判断只为支持xutils
            b = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(),
                    drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565);
            Canvas canvas1 = new Canvas(b);
            // canvas.setBitmap(bitmap);
            drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
            drawable.draw(canvas1);
        }
        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)
        int radius = 0;
        // 定义画两个边框,分别为外圆边框和内圆边框
        if (mBorderInsideColor != defaultColor && mBorderOutsideColor != defaultColor) {
            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);
    }

}

如果使用xutils加载图片的朋友可能有的时候用上这种圆图处理会报异常

java.lang.Class Cast Exception: com.lidroid.xutils.bitmap.core.Async Drawable cannot be cast to android.graphics.drawable.BitmapDrawable

在其中加上这个判断就OK了

  if(drawable instanceof BitmapDrawable){  
        b =  ((BitmapDrawable)drawable).getBitmap() ; 
     }else if(drawable instanceof AsyncDrawable){  
        b = Bitmap   
                .createBitmap(   
                getWidth(),   
                getHeight(),   
                drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888   
                : Bitmap.Config.RGB_565); 
                Canvas canvas1 = new Canvas(b); 
                // canvas.setBitmap(bitmap); 
                drawable.setBounds(0, 0, getWidth(),   
                getHeight()); 
                drawable.draw(canvas1); 
    }  

相关圆图组件还有很多:
https://github.com/vinc3m1/RoundedImageView
此组件 用于圆角。圆图,但不支持xutils显示

https://github.com/lopspower/CircularImageView
这个同样不支持xutils

https://github.com/hdodenhof/CircleImageView
这个也不错。同样不支持xutils

以上开源组件稍作修改便可支持xutils

Android ImageView部分圆图处理组件 xutils兼容问题

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