如何在Android应用程序中保存Canvas代码中的图像？

我在OnDraw（Canvas）中创建了一个图像，我试图保存该图像，但它的Not Working.image保存为零大小。 在这里我的编码

private int w; private int h; @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { this.w = w; this.h = h; super.onSizeChanged(w, h, oldw, oldh); } @Override protected void onDraw(Canvas canvas) { // TODO Auto-generated method stub Bitmap toDisk = Bitmap.createBitmap(w,h,Bitmap.Config.ARGB_8888); canvas.setBitmap(toDisk); Paint paint = new Paint(); Bitmap myBitmap = BitmapFactory.decodeResource(getResources(),R.drawable.ban_background); Bitmap resizeImage1=Bitmap.createScaledBitmap(myBitmap,590,350,false); canvas.drawColor(Color.BLACK); canvas.drawBitmap(resizeImage1,10,5, null); paint.setStyle(Paint.Style.FILL); paint.setAntiAlias(true); paint.setTextSize(25); paint.setColor(Color.BLUE); paint.setFakeBoldText(true); Bitmap icon; Bitmap icon1; Bitmap icon2; try { // Get reference to AssetManager AssetManager mngr = getAssets(); // Create an input stream to read from the asset folder InputStream ins = mngr.open(imageName+".png"); icon = BitmapFactory.decodeStream(ins); Bitmap icon9=Bitmap.createScaledBitmap(icon,590,250,false); canvas.drawBitmap(icon9,1,60, null); canvas.save(); if(isCamera) { icon1 = BitmapFactory.decodeByteArray(pictureByte, 0,pictureByte.length); Bitmap resizeImage=Bitmap.createScaledBitmap(icon1,150,170,false); canvas.drawBitmap(resizeImage,400,100, null); canvas.save(); } if(isPhotoGallery) { Bitmap myBitmap1 = BitmapFactory.decodeFile(selectedImagePath); Bitmap resizeImage=Bitmap.createScaledBitmap(myBitmap1,150,170,false); canvas.drawBitmap(resizeImage,400,100, null); } if(isImageSearch) { icon2= BitmapFactory.decodeByteArray(pictureByte, 0,pictureByte.length); canvas.drawBitmap(icon2,10,10, null); } paint.setTextSize(30); canvas.drawText(CameraText, 100,175, paint); getDrawingCache().compress(Bitmap.CompressFormat.JPEG, 100, new FileOutputStream(new File("/mnt/sdcard/arun.jpg"))); } catch (Exception e) { Log.e("Error--------->", e.toString()); } // Bitmap toDisk = Bitmap.createBitmap(resizeImage1); //s canvas.setBitmap(toDisk); /* code... */ try { toDisk.compress(Bitmap.CompressFormat.JPEG, 100, new FileOutputStream(new File("/mnt/sdcard/arun.jpg"))); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } 

Answer 1

尝试这个：

 private int w; private int h; @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { this.w = w; this.h = h; super.onSizeChanged(w, h, oldw, oldh); } protected void onDraw(Canvas canvas) { Bitmap toDisk = Bitmap.createBitmap(w,h,Bitmap.Config.ARGB_8888); canvas.setBitmap(toDisk); /* code... */ toDisk.compress(Bitmap.CompressFormat.JPEG, 100, new FileOutputStream(new File("/mnt/sdcard/arun.jpg"))); /* code... */ }