(1). 如果處理 png 的程式碼寫在 Button1Click and OnPaint Draw ,Android PNG 貼圖時會看到它沒有處理到透明 XE10.2 有問題,但 XE10.1 是對的
void __fastcall TForm2::Button1Click(TObject *Sender)
{ TImage *p = new TImage(NULL);
p->Bitmap->SetSize(m_ScreenPoint.x,m_ScreenPoint.y); // Windows is OK ,But Android is Failed p->Bitmap->Canvas->BeginScene(); p->Bitmap->Canvas->Clear(claWhite);
p->Bitmap->Canvas->DrawBitmap( bkimg->Bitmap,RectF(0, 0,bkimg->Bitmap->Width,bkimg->Bitmap->Height),RectF(0, 0,m_ScreenPoint.X,m_ScreenPoint.Y),1, true);
p->Bitmap->Canvas->DrawBitmap( i2->Bitmap,RectF(0, 0,i2->Bitmap->Width,i2->Bitmap->Height),RectF(10,250,10 i2->Bitmap->Width,250 i2->Bitmap->Height),1, true);
p->Bitmap->Canvas->EndScene();
p->Bitmap->Canvas->BeginScene();
m_ScreenImage->Bitmap->Canvas->BeginScene();
m_ScreenImage->Bitmap->Assign(p->Bitmap);
m_ScreenImage->Bitmap->Canvas->EndScene(); delete p ; InvalidateRect(RectF(0, 0,m_ScreenPoint.X,m_ScreenPoint.Y)); } void __fastcall TForm2::FormPaint(TObject *Sender, TCanvas *Canvas, const TRectF &ARect)
{
Canvas->DrawBitmap(m_ScreenImage->Bitmap,TRectF(0,0,m_ScreenImage->Bitmap->Width,m_ScreenImage->Bitmap->Height), TRectF(0,0,m_ScreenPoint.X,m_ScreenPoint.Y),1);
} //------------------------------------------------------------------------------------------------------------
This Code windows and Android is OK
void __fastcall TForm2::FormPaint(TObject *Sender, TCanvas *Canvas, const TRectF &ARect)
{
TImage *p = new TImage(NULL);
p->Bitmap->SetSize(m_ScreenPoint.x,m_ScreenPoint.y); // Windows And Android is OK Android
p->Bitmap->Canvas->Clear(claWhite);
p->Bitmap->Canvas->DrawBitmap( bkimg->Bitmap,RectF(0, 0,bkimg->Bitmap->Width,bkimg->Bitmap->Height),RectF(0, 0,m_ScreenPoint.X,m_ScreenPoint.Y),1, true);
p->Bitmap->Canvas->DrawBitmap( i2->Bitmap,RectF(0, 0,i2->Bitmap->Width,i2->Bitmap->Height),RectF(10,250,10 i2->Bitmap->Width,250 i2->Bitmap->Height),1, true); m_ScreenImage->Bitmap->Assign(p->Bitmap);
delete p ;
Canvas->DrawBitmap(m_ScreenImage->Bitmap,TRectF(0,0,m_ScreenImage->Bitmap->Width,m_ScreenImage->Bitmap->Height), TRectF(0,0,m_ScreenPoint.X,m_ScreenPoint.Y),1);
}

附加檔案：58ede97eac4c1_Png_Failed.zip