第三步android app相关说明

1、SurfaceView 绘图机首先它是一块画布 SurfaceView 一般会与 SurfaceHolder 用于向与之关联的 SufaceView上绘图，调用SurfaceView 的 getHolder（）方法即可获取 SurfaceView 关联的 SurfaeHolde（ locCanvasSurfaceViewSurfaceView 绘图机首先它是一块画布 SurfaceView 一般会与 SurfaceHolder 用于向与之关联的 SufaceView上绘图，调用SurfaceView 的 getHolder（）方法即可获取 SurfaceView 关联的 SurfaeHolde

2、（ locCanvasSurfaceViewSurfaceHoldersurfaceHolder=surfaceView.getHolderlockCanvasSurfaceView（）SurfaceViewCanvasCanvasCanvascanvas=surfaceHolder.lockCanvasBitmap mBitmap = BitmapFactory.decodeByteArray(jpg_buf, 0, 0null);/ 网络资源URL，同时绑定资源地址 URL url = new URL(HttpURLConnectionurlConn=(HttpURLConnection)

3、 readurlConn.getInputStream().read(buffer,0,readSize); urlConn.getInputStream() ：返回 URLConnection 对应的输入流，用于获取read(buffer,0,是Control格式的图像，JPEG 2 个字节组成， 其前一个字节是固定值 0 xFF0XD8图像开始。0XD9图像结束。SOI下面所列出的是数据处理代码部分publicvoidrun()/TODOAuto-generatedmethod格式的图像，JPEG 2 个字节组成， 其前一个字节是固定值 0 xFF0XD8图像开始。0XD9图像结束。SOI

4、下面所列出的是数据处理代码部分publicvoidrun()/TODOAuto-generatedmethodbufSize=1024bytejpg_buf=readSize=1024;bytebufSize;/buffertoreadbytebuffer=newbytereadSize;/buffertoreadURLurl=HttpURLConnectionurlConn=null; try url=newurlConn(HttpURLConnectionurl.openConnection使read=sus= jpg_count0jpgwhile(true)read=(read0)for

5、i= 0;i =case 18:jpg_bufjpg_count+=(byte)if(bufferi=(byte)0 xD9) us = 0;jpgif(sign)fos = new FileOutputStream(f); sign=mBitmap=BitmapFactory.decodeByteArray( jpg_buf, 0, jpg_buf.length);height=surfaceView.getHeight(); width = surfaceView.getWidth();Objectbtp=getReduceBitmap(mBitmap,width,*canvas.draw

6、Bitmap(Bitmap)arg0.obj,0,0,elseif(bufferi!=(byte)0 xFF) us = 17;sus =catch(Exceptione)/TODO:handleLog.v(tag有异常由/TODO:handleLog.v(tag有异常由heightsurfaceView.getHeight();/获取画布高度 width = surfaceView.getWidth();/获取画布宽度ObjectbtpgetReduceBitmap(mBitmap,widthheight);/*publicBitmapgetReduceBitmap(BitmapwidthhightMatrixmatrixnewMatrix();/floatwScakefloatwwidth);