Java Jwindow not showing like before

Question

AbioEngineer 2021-1-7

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/710693-java-jwindow-not-showing-like-before

回答： AbioEngineer 2021-1-8

From Animsplash https://www.mathworks.com/matlabcentral/fileexchange/56760-animated-gif-splash-screen

The JWindow object is not able to show anymore. I'm using a transparent jwindow to house a gif as a loading screen for my app, but the window does not show. Manually running the code in the command window of r2020b isn't working like it did for r2019a. Can anyone please run this below code with an image you have laying around and see if you can get it to display? I just updated to r2020b and now it doesn't work for me.

win = javax.swing.JWindow;
win.setBackground(java.awt.Color(0,0,0,0));
html=strcat('<html><img src="file:./',YOUR IMAGE HERE,'"/></html>');
label = javax.swing.JLabel(html);
win.getContentPane.add(label);
win.setAlwaysOnTop(true);
win.pack;
%% set the splash image to the center of the screen
screenSize = win.getToolkit.getScreenSize;
screenHeight = screenSize.height;
screenWidth = screenSize.width;
% set Location
win.setLocation((screenWidth-500)/2,(screenHeight-500)/2);
win.show

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Answer 1

AbioEngineer 2021-1-8

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https://ww2.mathworks.cn/matlabcentral/answers/710693-java-jwindow-not-showing-like-before#answer_593363

在 MATLAB Online 中打开

Sorry to answer my own question. Just thought I'd share that JLabel no longer scales itself to fit the image dimensions. In short, just replace the html line with

html=sprintf('<html><img src="file:./%s" width="%d" height="%d">', filename, imageWidth, imageHeight);

Obviously, replace these variable names or assign them values. You can also use java's bufferedimage class with the method getWidth() and getHeight() to find these dimensions