图片处理

 // 放大缩小图片  
	    public static Bitmap zoomBitmap(Bitmap bitmap, int w, int h) {  
	        int width = bitmap.getWidth();  
	        int height = bitmap.getHeight();  
	        Matrix matrix = new Matrix();  
	        float scaleWidht = ((float) w / width);  
	        float scaleHeight = ((float) h / height);  
	        matrix.postScale(scaleWidht, scaleHeight);  
	        Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height,  
	                matrix, true);  
	        return newbmp;  
	    }  
	  
	    // 将Drawable转化为Bitmap  
	    public static Bitmap drawableToBitmap(Drawable drawable) {  
	        int width = drawable.getIntrinsicWidth();  
	        int height = drawable.getIntrinsicHeight();  
	        Bitmap bitmap = Bitmap.createBitmap(width, height, drawable  
	                .getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888  
	                : Bitmap.Config.RGB_565);  
	        Canvas canvas = new Canvas(bitmap);  
	        drawable.setBounds(0, 0, width, height);  
	        drawable.draw(canvas);  
	        return bitmap;  
	  
	    }  
	  
	    // 获得圆角图片的方法  
	    public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx) {  
	        if(bitmap == null){  
	            return null;  
	        }  
	          
	        Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),  
	                bitmap.getHeight(), Config.ARGB_8888);  
	        Canvas canvas = new Canvas(output);  
	  
	        final int color = 0xff424242;  
	        final Paint paint = new Paint();  
	        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);  
	        canvas.drawRoundRect(rectF, roundPx, roundPx, paint);  
	  
	        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));  
	        canvas.drawBitmap(bitmap, rect, rect, paint);  
	        return output;  
	    }  
	  
	    // 获得带倒影的图片方法  
	    public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap) {  
	        final int reflectionGap = 4;  
	        int width = bitmap.getWidth();  
	        int height = bitmap.getHeight();  
	  
	        Matrix matrix = new Matrix();  
	        matrix.preScale(1, -1);  
	  
	        Bitmap reflectionImage = Bitmap.createBitmap(bitmap, 0, height / 2,  
	                width, height / 2, matrix, false);  
	  
	        Bitmap bitmapWithReflection = Bitmap.createBitmap(width,  
	                (height + height / 2), Config.ARGB_8888);  
	  
	        Canvas canvas = new Canvas(bitmapWithReflection);  
	        canvas.drawBitmap(bitmap, 0, 0, null);  
	        Paint deafalutPaint = new Paint();  
	        canvas.drawRect(0, height, width, height + reflectionGap, deafalutPaint);  
	  
	        canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);  
	  
	        Paint paint = new Paint();  
	        LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0,  
	                bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff,  
	                0x00ffffff, TileMode.CLAMP);  
	        paint.setShader(shader);  
	        // Set the Transfer mode to be porter duff and destination in  
	        paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));  
	        // Draw a rectangle using the paint with our linear gradient  
	        canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()  
	                + reflectionGap, paint);  
	  
	        return bitmapWithReflection;  
	    }