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我有一个画布我画,我试图把位图,将其转换为一个字节数组,并将其保存到一个文件序列化。然后再打开,反序列化,并将位图应用回画布。在下面的代码中,除了在画布上应用位图时,一切看起来都不错。有人可以告诉我哪里出错了。画布位图到字节数组和读取它的麻烦
public byte[] getCanvasData(){
ByteArrayOutputStream bos = new ByteArrayOutputStream();
mBitmap.compress(CompressFormat.PNG, 0, bos);
byte[] bitmapdata = bos.toByteArray();
return bitmapdata;
}
public void setCanvasData(byte[] canvasData, int w, int h){
mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
mBitmap.eraseColor(0x00000000);
mCanvas = new Canvas(mBitmap);
mCanvas.drawBitmap(BitmapFactory.decodeByteArray(canvasData , 0, canvasData.length).copy(Bitmap.Config.ARGB_8888, true), 0, 0, null);
}
增加了一些额外的代码可能有点帮助
public void readInSerialisable() throws IOException
{
FileInputStream fileIn = new FileInputStream("/sdcard/theBKup.ser");
ObjectInputStream in = new ObjectInputStream(fileIn);
try
{
BookData book = (BookData) in.readObject();
pages.clear();
canvasContainer.removeAllViews();
for (int i = 0; i < book.getBook().size(); i++){
Log.d("CREATION", "LOADING PAGE " + i);
pages.add(new Canvas2(context, book.getPageAt(i), canvasContainer.getWidth(), canvasContainer.getHeight()));
}
canvasContainer.addView(pages.get(page), new AbsoluteLayout.LayoutParams(AbsoluteLayout.LayoutParams.FILL_PARENT, AbsoluteLayout.LayoutParams.FILL_PARENT, 0, 0));
updatePagination();
Log.d("CREATION", "Updated Pagination");
}
catch (Exception exc)
{
System.out.println("didnt work");
exc.printStackTrace();
}
}
BookData - Serializable类包含我的所有数据,简单的获取/设置有
的onDraw方法
@Override
protected void onDraw(Canvas canvas) {
Log.d("DRAWING", "WE ARE DRAWING");
canvas.drawColor(0x00AAAAAA); //MAKE CANVAS TRANSPARENT
canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
canvas.drawPath(mPath, mPaint);
}
首先感谢您的建议,结果是Log.v(canvasData [0] + canvasData [1]);是-11980,我不知道这意味着什么...... – 2012-02-22 18:53:42
@KamilSalagan:这意味着字节流至少是有效的,我认为是这种情况。好像你的画布没有被更新。将发布更多笔记。 – PearsonArtPhoto 2012-02-22 19:01:44
这就是有趣的,至少我知道它是好的,但为什么不画布更新?我在我的过程结束时调用invalidate()方法,并且我知道onDraw被调用,我有一个Log.v在那里输出到控制台。 – 2012-02-22 19:05:34