android 中图片的一些操作

 
  图片的操作有哪些呢？
     如：zoomer-缩放，
         corner-圆角，
         reflected-倒影，
         grayscale-去色黑白，
         drawToBitmap-转换格式，
         ......

BitmapUtil代码:

public class BitmapUtil {

	// zoomer
	public static Bitmap zoomBitmap(Bitmap bitmap, int w, int h){
		int width = bitmap.getWidth();
		int height = bitmap.getHeight();
		Matrix matrix = new Matrix();
		
		float scaleWidth = w/(float)width;
		float scaleHeight = h/(float)height;
		matrix.postScale(scaleWidth, scaleHeight);
		
		Bitmap bitmap2 = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
		return bitmap2;		
	}
	
	
	// draw2Bitmap
	public static Bitmap draw2Bitmap(Drawable drawable){
		int width = drawable.getIntrinsicHeight();
		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;
	}
	
	
	// corner
	public static Bitmap getCornerBitmap(Bitmap bitmap, float roundPX){
		int width = bitmap.getWidth();
		int height = bitmap.getHeight();
		
		Bitmap bitmap2 = Bitmap.createBitmap(width, height, Config.ARGB_8888);
		Canvas canvas = new Canvas(bitmap2);
		
		final int color = 0xff424242;
		final Paint paint = new Paint();
		final Rect rect = new Rect(0, 0, width, height);
		final RectF rectF = new RectF(rect);

		paint.setColor(color);
		paint.setAntiAlias(true);
		canvas.drawARGB(0, 0, 0, 0);
		canvas.drawRoundRect(rectF, roundPX, roundPX, paint);
		
		paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
		canvas.drawBitmap(bitmap, rect, rect, paint);
		
		return bitmap2;
	}
	
	// reflected
	public static Bitmap createReflectedBitmap(Bitmap bitmap){
		final int reflectedGap = 4;
		int width = bitmap.getWidth();
		int height = bitmap.getHeight();
		
		Matrix matrix = new Matrix();
		matrix.preScale(1, -1);
		
		Bitmap reflectedImage = Bitmap.createBitmap(bitmap, 0, height/2, width, height/2, matrix, false);
		Bitmap reflectedBitmap = Bitmap.createBitmap(width, (height + height/2), Config.ARGB_8888);
		
		Canvas canvas = new Canvas(reflectedBitmap);
		canvas.drawBitmap(bitmap, 0, 0, null);
		Paint defaultPaint = new Paint();
		canvas.drawRect(0, height, width, height + reflectedGap, defaultPaint);
		canvas.drawBitmap(reflectedImage, 0, height + reflectedGap, null);
		
		Paint paint = new Paint();
		LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0,
								reflectedBitmap.getHeight() + reflectedGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);
		paint.setShader(shader);
		paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
		canvas.drawRect(0, height, width, reflectedBitmap.getHeight() + reflectedGap, paint);
		
		return reflectedBitmap;
	}
	
}
     //grayscale
	public static Bitmap toGrayscale(Bitmap bmpOriginal) {
		int width=bmpOriginal.getWidth();
		int height = bmpOriginal.getHeight();
		Bitmap bmpGrayscale = Bitmap.createBitmap(width, height,Bitmap.Config.RGB_565);
		Canvas c = new Canvas(bmpGrayscale);
		Paint paint = new Paint();
		ColorMatrix cm = new ColorMatrix();
		cm.setSaturation(0);
		ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
		paint.setColorFilter(f);
		c.drawBitmap(bmpOriginal, 0, 0, paint);
		return bmpGrayscale;
	}

应用的话就如：

Bitmap bitmap = bitmapProcess.drawable2Bitmap(drawable); 
Bitmap zoomBitmap = bitmapProcess.zoomBitmap(bitmap, 100, 100);
......
//drawable to bitmap   
imgView.setImageBitmap(roundBitmap);
//bitmap to drawable   
Drawable roundDrawable = new BitmapDrawable(roundBitmap);
imgView.setBackgroundDrawable(roundDrawable);