Question

I’m trying to create an ePub file in android.

Below is my source code.

But I’m getting fileNotFoundException at

epubWriter.write(book, new FileOutputStream("test1_book1.epub"));

I’ve put the cover.png and test1.html in assets folder.

Is corresponding css file is compulsory to build an ePub file?

I’m absolute beginner to ePub development so any help/suggestion would be appreciated.

CreateEPub.java

public class CreateEPub extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        AssetManager assetManager = getAssets();

        try {
            Book book = new Book();
            book.getMetadata().addTitle("Epub test book 1");
            book.getMetadata().addAuthor(new Author("Joe", "Tester"));
            InputStream is = assetManager.open("cover.png");
            book.getMetadata().setCoverImage(new Resource(is, "cover.png"));
            // Add Chapter 1
            InputStream is1 = assetManager.open("test1.html");
            book.addSection("Introduction", new Resource(is1, "chapter1.html"));

            EpubWriter epubWriter = new EpubWriter();
            epubWriter.write(book, new FileOutputStream("test1_book1.epub"));
            Log.v("ePub", "Created");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

EDIT

From various suggestions, Now I’m able to create a file but that is not in proper format I guess as when I pull that file from device and try to view it, it doesn’t open giving error that It is not a zip file.

LogCat

java.lang.NullPointerException
at org.kxml2.io.KXmlSerializer.attribute(KXmlSerializer.java:473)
at nl.siegmann.epublib.epub.PackageDocumentMetadataWriter.writeMetaData(PackageDocumentMetadataWriter.java:93)
at nl.siegmann.epublib.epub.PackageDocumentWriter.write(PackageDocumentWriter.java:45)
at nl.siegmann.epublib.epub.EpubWriter.writePackageDocument(EpubWriter.java:112)
0at nl.siegmann.epublib.epub.EpubWriter.write(EpubWriter.java:53)
at com.createepub.CreateEPub.onCreate(CreateEPub.java:93)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
at android.app.ActivityThread.access$2300(ActivityThread.java:125)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:4627)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
0at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
at dalvik.system.NativeStart.main(Native Method)

NOTE : CreateEPub.java:93 referes to epubWriter.write(book, out);

Answer 1

You can write files only to Internal Storage (device memory) or External Storage (the SD card), see data-storage. Simply opening a FileOutputStream with an arbitrary file name won’t work since that file system is read-only.