The Apryse Android Cordova API includes all of the most used functions and methods for viewing, annotating and saving PDF documents. However, it is possible your app may need access to APIs that are available as part of the native API, but are not directly available to Cordova.

This guide provides an example of how to add a "save" API to the Cordova interface, which triggers a save of the file and returns the file path of the save file. You can follow the same pattern to add new APIs that your Cordova app may need. The new APIs could be simple ones, which expose one piece of functionality, or custom ones, that expose a series of native commands under the hood.

The plugin is hosted on GitHub here: https://github.com/PDFTron/pdftron-cordova

Fork the project and clone a copy of the repository to your disk.

The .js interface file lists all of the Cordova APIs. It is located, starting at the forked plugin project, at www/PDFTron.js.

Add the following new API:

NativeViewer.prototype.save = function (success, error) {
exec(success, error, 'Apryse', 'save', []);
};

In the code above, success and error are output parameters, Apryse is the name of the module, save is the name of the method, and [] is an empty input parameter list.

public static final String Key_save = "save";

@Override
public boolean execute(String action, JSONArray args, CallbackContext callbackContext) throws JSONException {
    if (Key_save.equals(action)) {
        save(callbackContext);
    }
}

private void save(CallbackContext callbackContext) {
    cordova.getActivity().runOnUiThread(() -> {
        if (mDocumentView != null) {
            try {
                if (mDocumentView.mPdfViewCtrlTabHostFragment != null && mDocumentView.mPdfViewCtrlTabHostFragment.getCurrentPdfViewCtrlFragment() != null) {
                    mDocumentView.mPdfViewCtrlTabHostFragment.getCurrentPdfViewCtrlFragment().save(false, true, true);
                    callbackContext.success(mDocumentView.mPdfViewCtrlTabHostFragment.getCurrentPdfViewCtrlFragment().getFilePath());
                } else {
                    callbackContext.error("Saving failed.");
                }
            } catch (Exception ex) {
                callbackContext.error(ex.getMessage());
            }
        }
    });
}

Push your changes back to your forked copy of the repo.

Next, from the command line, navigate to the root of your Cordova app project and remove the Apryse Cordova plugin as follows:

cordova plugin remove pdftron-cordova

Then integrate your forked copy of the repo with the changes, using the appropriate names for your Git(Hub) name/repo:

cordova plugin add https://github.com:MyGithubOrg/pdftron-cordova-fork.git

The new method is now ready to use.

Note that if you later on need to update any code in the plugin (for example to add another method, or to fix a bug), you will need to remove and re-add the Cordova plugin every time in order to make the changes visible to your app.

The app can now access the new API as follows:

this.viewer.save(function (s) {
    console.log(s);
    fileUrl = "file://" + encodeURI(s);
    console.log(fileUrl);
}, function (e) {
    console.log(e);
});

If you're only developing for Android, then you're all done!

If you're developing for both iOS and Android, please consider submitting a PR, as upstreaming the change will simplify your developing and make the API available for other Apryse customers.