圆角图片展示控件

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package com.xiaoniu.finance.widget;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.PorterDuff;import android.graphics.PorterDuffXfermode;import android.graphics.Rect;import android.graphics.RectF;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.util.AttributeSet;import android.widget.ImageView;/** * 使用方式 * <com.xiaoniu.finance.widget.XNRoundRectImageView * android:id="@+id/image" * android:layout_width="250dp" * android:layout_height="80dp" * android:src="@drawable/lx2" * /> * <p> * 描述: 圆角图片控件 * 作者: 陈真 * 日期: 2017/11/10 */public class XNRoundRectImageView extends ImageView {    private Paint paint;    private int mRoundPx;    public XNRoundRectImageView(Context context) {        this(context, null);    }    public XNRoundRectImageView(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public XNRoundRectImageView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        paint = new Paint();    }    public void setImageRound(int roundPx){        this.mRoundPx = roundPx;        this.invalidate();    }    /**     * 绘制圆角矩形图片     *     * @author caizhiming     */    @Override    protected void onDraw(Canvas canvas) {        Drawable drawable = getDrawable();        if (null != drawable) {            Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();            Bitmap b = getRoundBitmap(bitmap, mRoundPx);            final Rect rectSrc = new Rect(0, 0, b.getWidth(), b.getHeight());            final Rect rectDest = new Rect(0, 0, getWidth(), getHeight());            paint.reset();            canvas.drawBitmap(b, rectSrc, rectDest, paint);        } else {            super.onDraw(canvas);        }    }    /**     * 获取圆角矩形图片方法     *     * @param bitmap     * @param roundPx,一般设置成14     * @return Bitmap     * @author caizhiming     */    private Bitmap getRoundBitmap(Bitmap bitmap, int roundPx) {        Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),                bitmap.getHeight(), Bitmap.Config.ARGB_8888);        Canvas canvas = new Canvas(output);        final int color = 0xff424242;        final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());        final RectF rectF = new RectF(rect);        paint.setAntiAlias(true);        canvas.drawARGB(0, 0, 0, 0);        paint.setColor(color);        int x = bitmap.getWidth();        canvas.drawRoundRect(rectF, roundPx, roundPx, paint);        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));        canvas.drawBitmap(bitmap, rect, rect, paint);        return output;    }}
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