使用存储访问框架

Question

It works fine if you write a few data. But if you write a lot of data (which will run for a long time), it will fail with: java.io.IOException: write failed: EBADF (Bad file number)

Here's the code:

writeLargeDataToStream(new FileOutputStream(getContentResolver()
        .openFileDescriptor(data.getData(), "w").getFileDescriptor()));

Answer 1

It seems you need to keep the ParcelFileDescriptor alive from garbage collection by putting it into a local field like this:

private ParcelFileDescriptor descriptor;

And do this:

descriptor = getContentResolver().openFileDescriptor(data.getData(), "w");
writeLargeDataToStream(new FileOutputStream(descriptor.getFileDescriptor()));

When you've done using that, let garbage collector know it's collectible by using:

descriptor = null;