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I am trying to export the Part data as JIIX data in the Editor's callback for onContentChanged. It usually works, but I sometimes get the following exception. Do you have any idea about what's going wrong and what I could do to fix the issue? I tried adding a call to Editor.waitForIdle() before calling export(), but the call never returns and the app hangs if I do that.

2021-05-11 14:52:31.109 19696-19822/com.myapp E/AndroidRuntime: FATAL EXCEPTION: Thread-2361
    Process: com.myapp, PID: 19696
    java.lang.IllegalStateException: export operation failed, processing may not be over
        at com.myscript.iink.NativeFunctions.doExport1(Native Method)
        at com.myscript.iink.Editor.export_(Editor.java:971)
        at com.myapp.IinkLayer.processContentChanged(IinkLayer.java:478)
        at com.myapp.IinkLayer.access$100(IinkLayer.java:49)
        at com.myapp.IinkLayer$1.contentChanged(IinkLayer.java:154)
        at com.myscript.iink.Editor$3.accept(Editor.java:152)
        at com.myscript.iink.Editor$3.accept(Editor.java:148)
        at com.myscript.iink.ListenerList.forEach(ListenerList.java:50)
        at com.myscript.iink.Editor.contentChanged(Editor.java:147)

Following is the code I use to export the data. It is called directly in the onContentChanged callback. I catch IOExceptions, but the exception being thrown is IllegalStateException.

String jiixData = "";
try {
    // Export the whole part data
    jiixData = editor.export_(null, MimeType.JIIX);
} catch (IOException e) {
    Log.e(TAG, "Export error!", e);
    return;
}

Thank you for your help!

Hi Olivier,

To simplify things, I did a test with the project GetStarted from the sample files. I added waitForIdle() in the callback for contentChanged() so that the callback now looks as follows:

@Override
public void contentChanged(Editor editor, String[] blockIds)
{
    editor.waitForIdle(); // Only this line was added
    invalidateOptionsMenu();
    invalidateIconButtons();
}

With this code, iink processing stops responding after the first stroke. It is still possible to draw strokes, but the conversion preview is never displayed and tapping the "convert" button will cause the app to stop responding (probably UI thread waiting for Editor thread which is in a deadlock as below).

My guess is that the Editor processing runs in its own thread and that contentChanged() is called on that thread, so if we call waitForIdle() there, the Editor ends up waiting for itself and waitForIdle() never returns.

We are thinking that maybe we should call Export on a thread different from the one calling contentChanged(), but do you have a better suggestion?

Thanks!