Java代码 
- /**
- * 1.放大缩小图片
- *
- * @param bitmap
- * @param w
- * @param h
- * @return
- */
- 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;
- }
- /**
- * 2.获得圆角图片的方法
- *
- * @param bitmap
- * @param roundPx
- * @return
- */
- public static 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;
- }
- /**
- * 3.获得带倒影的图片方法
- *
- * @param bitmap
- * @return
- */
- 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;
- }
- /**
- * 4.将Drawable转化为Bitmap
- *
- * @param drawable
- * @return
- */
- 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;
- }