WebView: file upload

RegistrationFormActivity.java

/**
 * New user registration.
 */
public class RegistrationFormActivity extends Activity {

    // for file uploading
    private final static int FILE_CHOOSER_RESULT_CODE = 1;
    private ValueCallback<Uri> uploadFile;

    // ...

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        wv = new WebView(this);
        wv.setWebChromeClient(new RegistrationWebChromeClient());
        // ...
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
        if (requestCode == FILE_CHOOSER_RESULT_CODE) {
            if (uploadFile == null)
                return;

            final Uri result = ((intent == null) || (resultCode != RESULT_OK)) ? null : intent.getData();
            uploadFile.onReceiveValue(result);
            uploadFile = null;
        }
    }

    private class RegistrationWebChromeClient extends android.webkit.WebChromeClient {
        @Override
        public void onConsoleMessage(String message, int lineNumber, String sourceID) {
            Log.w(sourceID, message);
        }

        //@Override
        // Dirty hack here: overriding hidden method to handle <input type='file'/>
        @SuppressWarnings({"UnusedDeclaration"})
        public void openFileChooser(ValueCallback<Uri> uploadMessage) {
            uploadFile = uploadMessage;

            final Intent i = new Intent(Intent.ACTION_GET_CONTENT);
            i.addCategory(Intent.CATEGORY_OPENABLE);
            i.setType("image/*");
            startActivityForResult(Intent.createChooser(i, "File Chooser"), FILE_CHOOSER_RESULT_CODE);
        }
    }

    // ...
}

Is this for all extension of files, such as pdf, doc, png, ppt ?