Matrix m = new Matrix();m.setScale(4.0f, 4.0f);Bitmap newBitmap = Bitmap.createBitmap(oldBitmap, 0, 0, oldBitmap.getWidth(), oldBitmap.getHeight(), m, true);把这段代码写在图片点击事件中,newBitmap设置为imageview的背景就行了。这时newBitmap是oldBitmap的4倍大