import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;
 
/**
 * 自定義的圓角矩形ImageView，可以直接當元件在佈局中使用。
 * @author zxj
 *
 */
public class XHRoundImageView extends ImageView{
 
    private Paint paint;
    private  int radius=60;
 
    public int getRadius() {
        return radius;
    }
 
    public void setRadius(int radius) {
        this.radius = radius;
    }
 
    public XHRoundImageView(Context context) {
        this(context,null);
    }
 
    public XHRoundImageView(Context context, AttributeSet attrs) {
        this(context, attrs,0);
    }
 
    public XHRoundImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        paint  = new Paint();
    }
 
    /**
     * 繪製圓角矩形圖片
     *
     */
    @Override
    protected void onDraw(Canvas canvas) {
 
        Drawable drawable = getDrawable();
        if (null != drawable) {
            Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();
            bitmap=getScaleBitmap(bitmap,this.getWidth(),this.getHeight());
            Bitmap b = getRoundBitmap(bitmap, radius);
 
            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);
        }
    }
 
    /**
     * 獲取圓角矩形圖片方法
     * @param bitmap
     * @param roundPx,
     * @return Bitmap
     * @author
     */
    private Bitmap getRoundBitmap(Bitmap bitmap, int roundPx) {
        Bitmap output = Bitmap.createBitmap(this.getWidth(),
                this.getHeight(), Config.ARGB_8888);
        Canvas canvas = new Canvas(output);
 
        final int color = 0xff424242;
 
        final Rect rect = new Rect(0, 0, this.getWidth(), this.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(Mode.SRC_IN));
        canvas.drawBitmap(bitmap, rect, rect, paint);
        return output;
    }
 
    private static Bitmap getScaleBitmap(Bitmap bitmap,float scalex,float scaley) {
        int width=bitmap.getWidth();
        int height=bitmap.getHeight();
        Matrix matrix = new Matrix();
        matrix.postScale((float)scalex/width,(float)scaley/height); //長和寬放大縮小的比例
        Bitmap resizeBmp = Bitmap.createBitmap(bitmap,0,0,bitmap.getWidth(),bitmap.getHeight(),matrix,true);
        return resizeBmp;
    }
 
 
 
 
 
}