android图片处理,flutter跳转动画
作者:互联网
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final Resources resources = context.getResources();
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sIconWidth = sIconHeight = (int) resources.getDimension(
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android.R.dimen.app_icon_size);
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}
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int width = sIconWidth;
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int height = sIconHeight;
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final int bitmapWidth = bitmap.getWidth();
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final int bitmapHeight = bitmap.getHeight();
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if (width > 0 && height > 0) {
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if (width < bitmapWidth || height < bitmapHeight) {
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final float ratio = (float) bitmapWidth / bitmapHeight;
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if (bitmapWidth > bitmapHeight) {
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height = (int) (width / ratio);
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} else if (bitmapHeight > bitmapWidth) {
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width = (int) (height * ratio);
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}
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final Bitmap.Config c = (width == sIconWidth && height == sIconHeight) ?
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bitmap.getConfig() : Bitmap.Config.ARGB_8888;
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final Bitmap thumb = Bitmap.createBitmap(sIconWidth, sIconHeight, c);
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final Canvas canvas = sCanvas;
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final Paint paint = sPaint;
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canvas.setBitmap(thumb);
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paint.setDither(false);
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paint.setFilterBitmap(true);
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sBounds.set((sIconWidth - width) / 2, (sIconHeight - height) / 2, width, height);
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sOldBounds.set(0, 0, bitmapWidth, bitmapHeight);
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canvas.drawBitmap(bitmap, sOldBounds, sBounds, paint);
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return thumb;
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} else if (bitmapWidth < width || bitmapHeight < height) {
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final Bitmap.Config c = Bitmap.Config.ARGB_8888;
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final Bitmap thumb = Bitmap.createBitmap(sIconWidth, sIconHeight, c);
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final Canvas canvas = sCanvas;
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final Paint paint = sPaint;
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canvas.setBitmap(thumb);
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paint.setDither(false);
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paint.setFilterBitmap(true);
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canvas.drawBitmap(bitmap, (sIconWidth - bitmapWidth) / 2,
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(sIconHeight - bitmapHeight) / 2, paint);
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return thumb;
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}
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}
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return bitmap;
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}
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}
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//Android Matrix类实现镜像方法
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public void drawRegion(Image image_src,
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int x_src, int y_src,
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int width, int height,
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int transform,
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int x_dest, int y_dest,
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int anchor){
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if((anchor&VCENTER) != 0){
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y_dest -= height/2;
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}else if((anchor&BOTTOM) != 0){
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y_dest -= height;
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}
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if((anchor&RIGHT) != 0){
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x_dest -= width;
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}else if((anchor&HCENTER) != 0){
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x_dest -= width/2;
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}
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Bitmap newMap = Bitmap.createBitmap(image_src.getBitmap(), x_src, y_src, width, height);
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Matrix mMatrix = new Matrix();
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Matrix temp = new Matrix();
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Matrix temp2 = new Matrix();
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float[] mirrorY = {
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-1, 0, 0,
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0, 1, 0,
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0, 0, 1
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};
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temp.setValues(mirrorY);
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switch(transform){
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case Sprite.TRANS_NONE:
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break;
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case Sprite.TRANS_ROT90:
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mMatrix.setRotate(90,width/2, height/2);
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break;
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case Sprite.TRANS_ROT180:
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mMatrix.setRotate(180,width/2, height/2);
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break;
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case Sprite.TRANS_ROT270:
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mMatrix.setRotate(270,width/2, height/2);
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break;
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case Sprite.TRANS_MIRROR:
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mMatrix.postConcat(temp);
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break;
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case Sprite.TRANS_MIRROR_ROT90:
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mMatrix.postConcat(temp);
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mMatrix.setRotate(90,width/2, height/2);
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break;
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case Sprite.TRANS_MIRROR_ROT180:
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mMatrix.postConcat(temp);
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mMatrix.setRotate(180,width/2, height/2);
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break;
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case Sprite.TRANS_MIRROR_ROT270:
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mMatrix.postConcat(temp);
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mMatrix.setRotate(270,width/2, height/2);
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break;
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}
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mMatrix.setTranslate(x_dest, y_dest);
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canvas.drawBitmap(newMap, mMatrix, mPaint);
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}
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//图片Url保存为位图并进行缩放操作
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//通过传入图片url获取位图方法
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public Bitmap returnBitMap(String url) {
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URL myFileUrl = null;
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Bitmap bitmap = null;
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try {
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myFileUrl = new URL(url);
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} catch (MalformedURLException e) {
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e.printStackTrace();
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}
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try {
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HttpURLConnection conn = (HttpURLConnection) myFileUrl
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.openConnection();
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conn.setDoInput(true);
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conn.connect();
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InputStream is = conn.getInputStream();
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bitmap = BitmapFactory.decodeStream(is);
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is.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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Log.v(tag, bitmap.toString());
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return bitmap;
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}
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//通过传入位图,新的宽.高比进行位图的缩放操作
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public static Drawable resizeImage(Bitmap bitmap, int w, int h) {
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// load the origial Bitmap
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Bitmap BitmapOrg = bitmap;
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int width = BitmapOrg.getWidth();
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int height = BitmapOrg.getHeight();
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int newWidth = w;
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int newHeight = h;
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Log.v(tag, String.valueOf(width));
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Log.v(tag, String.valueOf(height));
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Log.v(tag, String.valueOf(newWidth));
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Log.v(tag, String.valueOf(newHeight));
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// calculate the scale
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float scaleWidth = ((float) newWidth) / width;
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float scaleHeight = ((float) newHeight) / height;
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// create a matrix for the manipulation
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Matrix matrix = new Matrix();
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// resize the Bitmap
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matrix.postScale(scaleWidth, scaleHeight);
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// if you want to rotate the Bitmap
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// matrix.postRotate(45);
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// recreate the new Bitmap
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Bitmap resizedBitmap = Bitmap.createBitmap(BitmapOrg, 0, 0, width,
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height, matrix, true);
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// make a Drawable from Bitmap to allow to set the Bitmap
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// to the ImageView, ImageButton or what ever
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return new BitmapDrawable(resizedBitmap);
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}
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1.图片加载方法,方便用户加载图片
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/***
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* 加载本地图片
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* @param context:主运行函数实例
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* @param bitAdress:图片地址,一般指向R下的drawable目录
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* @return
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*/
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public final Bitmap CreatImage(Context context, int bitAdress) {
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Bitmap bitmaptemp = null;
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bitmaptemp = BitmapFactory.decodeResource(context.getResources(),
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bitAdress);
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return bitmaptemp;
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}
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2.图片平均分割方法,将大图平均分割为N行N列,方便用户使用
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/***
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* 图片分割
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*
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* @param g
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* :画布
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* @param paint
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* :画笔
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* @param imgBit
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* :图片
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* @param x
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* :X轴起点坐标
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* @param y
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* :Y轴起点坐标
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* @param w
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* :单一图片的宽度
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* @param h
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* :单一图片的高度
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* @param line
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* :第几列
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* @param row
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* :第几行
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*/
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public final void cuteImage(Canvas g, Paint paint, Bitmap imgBit, int x,
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int y, int w, int h, int line, int row) {
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g.clipRect(x, y, x + w, h + y);
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g.drawBitmap(imgBit, x – line * w, y – row * h, paint);
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g.restore();
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}
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3.图片缩放,对当前图片进行缩放处理
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/***
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* 图片的缩放方法
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*
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* @param bgimage
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* :源图片资源
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* @param newWidth
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* :缩放后宽度
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* @param newHeight
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* :缩放后高度
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* @return
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*/
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public Bitmap zoomImage(Bitmap bgimage, int newWidth, int newHeight) {
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// 获取这个图片的宽和高
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int width = bgimage.getWidth();
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int height = bgimage.getHeight();
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// 创建操作图片用的matrix对象
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Matrix matrix = new Matrix();
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// 计算缩放率,新尺寸除原始尺寸
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float scaleWidth = ((float) newWidth) / width;
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float scaleHeight = ((float) newHeight) / height;
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// 缩放图片动作
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matrix.postScale(scaleWidth, scaleHeight);
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Bitmap bitmap = Bitmap.createBitmap(bgimage, 0, 0, width, height,
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matrix, true);
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return bitmap;
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}
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4.绘制带有边框的文字,一般在游戏中起文字的美化作用
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/***
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* 绘制带有边框的文字
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*
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* @param strMsg
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* :绘制内容
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* @param g
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* :画布
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* @param paint
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* :画笔
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* @param setx
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* ::X轴起始坐标
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* @param sety
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* :Y轴的起始坐标
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* @param fg
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* :前景色
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* @param bg
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* :背景色
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*/
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public void drawText(String strMsg, Canvas g, Paint paint, int setx,
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int sety, int fg, int bg) {
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paint.setColor(bg);
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g.drawText(strMsg, setx + 1, sety, paint);
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g.drawText(strMsg, setx, sety – 1, paint);
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g.drawText(strMsg, setx, sety + 1, paint);
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g.drawText(strMsg, setx – 1, sety, paint);
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paint.setColor(fg);
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g.drawText(strMsg, setx, sety, paint);
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g.restore();
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}
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5.Android 图片透明度处理代码
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/**
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* 图片透明度处理
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*
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* @param sourceImg
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* 原始图片
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* @param number
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* 透明度
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* @return
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*/
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public static Bitmap setAlpha(Bitmap sourceImg, int number) {
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int[] argb = new int[sourceImg.getWidth() * sourceImg.getHeight()];
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sourceImg.getPixels(argb, 0, sourceImg.getWidth(), 0, 0,sourceImg.getWidth(), sourceImg.getHeight());// 获得图片的ARGB值
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number = number * 255 / 100;
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for (int i = 0; i < argb.length; i++) {
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argb = (number << 24) | (argb & 0×00FFFFFF);// 修改最高2位的值
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}
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sourceImg = Bitmap.createBitmap(argb, sourceImg.getWidth(), sourceImg.getHeight(), Config.ARGB_8888);
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return sourceImg;
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}
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6.图片翻转
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Resources res = this.getContext().getResources();
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img = BitmapFactory.decodeResource(res, R.drawable.slogo);
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Matrix matrix = new Matrix();
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matrix.postRotate(90); /*翻转90度*/
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int width = img.getWidth();
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int height = img.getHeight();
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r_img = Bitmap.createBitmap(img, 0, 0, width, height, matrix, true);
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import android.graphics.Bitmap;
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import android.graphics.Canvas;
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import android.graphics.LinearGradient;
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import android.graphics.Matrix;
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import android.graphics.Paint;
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import android.graphics.PixelFormat;
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import android.graphics.PorterDuffXfermode;
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import android.graphics.Rect;
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import android.graphics.RectF;
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import android.graphics.Bitmap.Config;
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import android.graphics.PorterDuff.Mode;
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import android.graphics.Shader.TileMode;
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import android.graphics.drawable.Drawable;
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/**
-
*
-
* @author superdev
-
* @version 1.0
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*
-
*/
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public class ImageUtil {
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/**
-
* 放大缩小图片
-
*/
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public static Bitmap zoomBitmap(Bitmap bitmap, int w, int h) {
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int width = bitmap.getWidth();
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int height = bitmap.getHeight();
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Matrix matrix = new Matrix();
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float scaleWidht = ((float) w / width);
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float scaleHeight = ((float) h / height);
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matrix.postScale(scaleWidht, scaleHeight);
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Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
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return newbmp;
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}
-
/**
-
* 将Drawable转化为Bitmap
-
*/
-
public static Bitmap drawableToBitmap(Drawable drawable) {
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int width = drawable.getIntrinsicWidth();
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int height = drawable.getIntrinsicHeight();
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Bitmap bitmap = Bitmap.createBitmap(width, height, drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565);
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Canvas canvas = new Canvas(bitmap);
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drawable.setBounds(0, 0, width, height);
-
drawable.draw(canvas);
-
return bitmap;
-
}
-
/**
-
* 获得圆角图片的方法
-
*/
-
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);
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paint.setColor(color);
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canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
-
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
-
canvas.drawBitmap(bitmap, rect, rect, paint);
-
return output;
-
}
-
/**
-
* 获得带倒影的图片方法
-
*/
-
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;
-
}
-
}
-
private byte[] Bitmap2Bytes(Bitmap bm){
-
ByteArrayOutputStream baos = new ByteArrayOutputStream();
-
bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
-
return ba
《Android学习笔记总结+最新移动架构视频+大厂安卓面试真题+项目实战源码讲义》
【docs.qq.com/doc/DSkNLaERkbnFoS0ZF】 完整资料开源分享
os.toByteArray();
-
}
-
private Bitmap Bytes2Bimap(byte[] b){
-
if(b.length!=0){
-
return BitmapFactory.decodeByteArray(b, 0, b.length);
-
}
-
else {
-
return null;
-
}
-
}
-
/**
-
* create the bitmap from a byte array
-
*生成水印图片
-
* @param src the bitmap object you want proecss
-
* @param watermark the water mark above the src
-
* @return return a bitmap object ,if paramter’s length is 0,return null
-
*/
-
private Bitmap createBitmap( Bitmap src, Bitmap watermark )
-
{
-
String tag = “createBitmap”;
-
Log.d( tag, “create a new bitmap” );
-
if( src == null )
-
{
-
return null;
-
}
-
int w = src.getWidth();
-
int h = src.getHeight();
-
int ww = watermark.getWidth();
-
int wh = watermark.getHeight();
-
//create the new blank bitmap
-
Bitmap newb = Bitmap.createBitmap( w, h, Config.ARGB_8888 );//创建一个新的和SRC长度宽度一样的位图
-
Canvas cv = new Canvas( newb );
-
//draw src into
-
cv.drawBitmap( src, 0, 0, null );//在 0,0坐标开始画入src
-
//draw watermark into
-
cv.drawBitmap( watermark, w - ww + 5, h - wh + 5, null );//在src的右下角画入水印
-
//save all clip
-
cv.save( Canvas.ALL_SAVE_FLAG );//保存
-
//store
-
cv.restore();//存储
-
return newb;
-
}
-
/** 重新编码Bitmap
-
*
-
* @param src
-
* 需要重新编码的Bitmap
-
*
-
* @param format
-
* 编码后的格式(目前只支持png和jpeg这两种格式)
-
*
-
* @param quality
-
* 重新生成后的bitmap的质量
-
*
-
* @return
-
* 返回重新生成后的bitmap
-
*/
-
private static Bitmap codec(Bitmap src, Bitmap.CompressFormat format,
-
int quality) {
-
ByteArrayOutputStream os = new ByteArrayOutputStream();
-
src.compress(format, quality, os);
-
byte[] array = os.toByteArray();
-
return BitmapFactory.decodeByteArray(array, 0, array.length);
-
}
-
//Stream转换成Byte
-
static byte[] streamToBytes(InputStream is) {
-
ByteArrayOutputStream os = new ByteArrayOutputStream(1024);
-
byte[] buffer = new byte[1024];
-
int len;
-
try {
-
while ((len = is.read(buffer)) >= 0) {
总结
最后对于程序员来说,要学习的知识内容、技术有太多太多,要想不被环境淘汰就只有不断提升自己,从来都是我们去适应环境,而不是环境来适应我们!
这里附上上述的技术体系图相关的几十套腾讯、头条、阿里、美团等公司20年的面试题,把技术点整理成了视频和PDF(实际上比预期多花了不少精力),包含知识脉络 + 诸多细节,由于篇幅有限,这里以图片的形式给大家展示一部分。
相信它会给大家带来很多收获:
当程序员容易,当一个优秀的程序员是需要不断学习的,从初级程序员到高级程序员,从初级架构师到资深架构师,或者走向管理,从技术经理到技术总监,每个阶段都需要掌握不同的能力。早早确定自己的职业方向,才能在工作和能力提升中甩开同龄人。
-
int quality) {
-
ByteArrayOutputStream os = new ByteArrayOutputStream();
-
src.compress(format, quality, os);
-
byte[] array = os.toByteArray();
-
return BitmapFactory.decodeByteArray(array, 0, array.length);
-
}
-
//Stream转换成Byte
-
static byte[] streamToBytes(InputStream is) {
-
ByteArrayOutputStream os = new ByteArrayOutputStream(1024);
-
byte[] buffer = new byte[1024];
-
int len;
-
try {
-
while ((len = is.read(buffer)) >= 0) {
总结
最后对于程序员来说,要学习的知识内容、技术有太多太多,要想不被环境淘汰就只有不断提升自己,从来都是我们去适应环境,而不是环境来适应我们!
这里附上上述的技术体系图相关的几十套腾讯、头条、阿里、美团等公司20年的面试题,把技术点整理成了视频和PDF(实际上比预期多花了不少精力),包含知识脉络 + 诸多细节,由于篇幅有限,这里以图片的形式给大家展示一部分。
相信它会给大家带来很多收获:
[外链图片转存中…(img-Z6p2Xb7r-1640759041380)]
[外链图片转存中…(img-ASNgZajU-1640759041381)]
当程序员容易,当一个优秀的程序员是需要不断学习的,从初级程序员到高级程序员,从初级架构师到资深架构师,或者走向管理,从技术经理到技术总监,每个阶段都需要掌握不同的能力。早早确定自己的职业方向,才能在工作和能力提升中甩开同龄人。
标签:int,转动,height,width,bitmap,new,android,Bitmap,flutter 来源: https://blog.csdn.net/m0_65686805/article/details/122214998