Android simple image processing

Collect Image Processing code on the Internet for future use.

 

I. Image flip (get the image after 180 degrees of flip)

Matrix M = new matrix ();

M. setscale (-1, 1 );

Bitmap newbit = bitmap. createbitmap (bit, 0, 0, bit. getwidth (), bit. getheight (), M, true );

 

Ii. Zoom in and out images

Matrix M = new matrix ();

M. setscale (0.5f, 0.5f); // scale down to half. The zoom ratio is greater than one zoom in S.

Bitmap newbit = bitmap. createbitmap (bit, 0, 0, bit. getwidth (), bit. getheight (), M, true );

 

Iii. Reflection

// Method for obtaining images with reflections

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 porterduxfermode (mode. dst_in ));

// Draw a rectangle using the paint with our linear gradient canvas. drawrect (0, height, width, bitmapwithreflection. getheight () + reflectiongap, paint );

Return bitmapwithreflection ;}

Iv. rounded corner image s

// Obtain the rounded corner Image

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 = 0xff0000242;

Final paint = new paint ();

Final rect = new rect (0, 0, bitmap. getwidth (), bitmap. getheight ());

Final 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 porterduxfermode (mode. src_in ));

Canvas. drawbitmap (bitmap, rect, rect, paint );

Return output ;}