How to achieve the zooming effect of android Sina Weibo pictures

< bmpWidth / 4 || scaleHeight * scale * bmpHeight >

BmpWidth / 4 | | scaleWidth * scale * bmpWidth > displayWidth / 5 | | scaleHeight * scale * bmpHeight > displayHeight / 5) & & (zoomNumber==-1) {zoom.setIsZoomOutEnabled (false);} else {zoom.setIsZoomOutEnabled (true);} zoom.setIsZoomInEnabled (true); System.gc () } / * method * / private void big () {+ + zoomNumber; int bmpWidth = bmp.getWidth (); int bmpHeight = bmp.getHeight (); / * set the magnification ratio of the picture * / double scale = 1.25; / * calculate the scale to be enlarged this time * / scaleWidth = (float) (scaleWidth * scale) ScaleHeight = (float) (scaleHeight * scale); / * Bitmap object after generating reSize * / Matrix matrix = new Matrix (); matrix.postScale (scaleWidth, scaleHeight); Bitmap resizeBmp = Bitmap.createBitmap (bmp, 0,0, bmpWidth, bmpHeight, matrix, true); mImageView.setImageBitmap (resizeBmp) / * limit the magnification size * / if (scaleWidth * scale * bmpWidth > bmpWidth * 4 | | scaleHeight * scale * bmpHeight > bmpWidth * 4 | | scaleWidth * scale * bmpWidth > displayWidth * 5 | | scaleHeight * scale * bmpHeight > displayHeight * 5) {zoom.setIsZoomInEnabled (false);} else {zoom.setIsZoomInEnabled (true);} zoom.setIsZoomOutEnabled (true) System.gc ();}}

The layout file is as follows:

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