Android图片处理

Android对于图片处理有很多种，现在给大家介绍几种常用的图片处理方法，具体的代码如下：

//旋转图片
	private static Bitmap rotateBitmap(Bitmap b, int degrees) {
        if (degrees != 0 && b != null) {
            Matrix m = new Matrix();
            m.setRotate(degrees,
                    (float) b.getWidth() / 2, (float) b.getHeight() / 2);
            try {
                Bitmap b2 = Bitmap.createBitmap(
                        b, 0, 0, b.getWidth(), b.getHeight(), m, true);
                if (b != b2) {
                    b.recycle();  //释放资源
                    b = b2;
                }
            } catch (OutOfMemoryError ex) {
                return b; //返回原始图片
            }
        }
        return b;
    }

//背景渐变
	private Bitmap drawLineGradient(Bitmap bm){
		Canvas canvas = new Canvas(bm);
		Paint paint = new Paint();
		LinearGradient lg=new LinearGradient(0,0,bm.getWidth(), bm.getHeight(),
				Color.RED,Color.BLUE,
				TileMode.REPEAT);  
		paint.setShader(lg);
		canvas.drawRect(0, 0, bm.getWidth(), bm.getHeight(), paint);
		
		return bm;
	}

//获得圆角图片的方法  
    private Bitmap getRoundedCornerBitmap(Bitmap bitmap,float roundPx){  
          
        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;  
    } 

更多效果请参见： http://www.lrguan.com/articles/20130708.htm