I have a problem with FAT12 file system support. I'm trying to read/write
XML file on 2Mb memory device. This device is formatted in FAT12. In a good
case first, I found a path by using broadcast receiver when I plug my
android device and then create file like this:
public ConfigToXMLTask(String filename, Context context) {
this.file = new File(filename);
this.context = context;
}
@Override
protected File doInBackground(MainConfig... params){
DocumentBuilderFactory xmlFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder xmlBuilder = xmlFactory.newDocumentBuilder();
Document doc = xmlBuilder.newDocument();
Element rootElement = doc.createElement("document");
rootElement.setAttribute("ppk", config.getDeviceName());
rootElement.setAttribute("ver", "01");
rootElement.setAttribute("rev", "00");
doc.appendChild(rootElement);
config.buildXMLElement(rootElement);
Transformer transformer = TransformerFactory.newInstance().newTransformer();
transformer.setOutputProperty(OutputKeys.DOCTYPE_PUBLIC, "yes");
transformer.setOutputProperty(OutputKeys.ENCODING, "Windows-1251");
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount";,
"2");
file.createNewFile();
transformer.transform(new DOMSource(doc), new StreamResult(new
FileOutputStream(file)));
}
The problem is that on some android devices access to my 2Mb flash drive not
available and broadcast receiver doesn't work.
Here is a code of receiver:
private UsbReceiver receiver;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
receiver = new UsbReceiver();
filter = new IntentFilter();
filter.addAction(Intent.ACTION_MEDIA_MOUNTED);
filter.addAction(Intent.ACTION_MEDIA_UNMOUNTED);
filter.addAction(Intent.ACTION_MEDIA_BAD_REMOVAL);
filter.addDataScheme("file");
registerReceiver(receiver, filter);
}
public static class UsbReceiver extends BroadcastReceiver {
@Override
public void onReceive(final Context context, Intent intent) {
if (intent.getAction().equals(Intent.ACTION_MEDIA_MOUNTED)) {
Uri uriFile = intent.getData();
File dir = new File(uriFile.getPath());
SharedPreferences prefs =
PreferenceManager.getDefaultSharedPreferences(context);
prefs.edit().putString("usb", uriFile.getPath()).apply();
if (dir.canRead()) {
String[] fileList = dir.list();
for (String aFileList : fileList) {
if (aFileList.contains("CONFIG.XML")) {
final File config = new File(dir, aFileList);
prefs.edit().putString("dir",
dir.getPath()).apply();
new AlertDialog.Builder(context)
.setTitle(R.string.attention)
.setMessage(R.string.device_detected)
.setPositiveButton("OK", new
DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface
dialog, int which) {
MyXMLParser.convertXMLtoConfig(config, context);
}
})
.setNegativeButton(android.R.string.cancel,
null)
.show();
}
}
}
}
}
}
@Override
protected void onResume() {
registerReceiver(receiver, filter);
wheel.startAnimation(wheel.getAnimation());
super.onResume();
}
@Override
protected void onPause() {
unregisterReceiver(receiver);
super.onPause();
}
Default file managers can read files, but I haven't found good solutions for
reading (or receiving access to write/reading) files from USB OTG.
Maybe there is some library based on documentation
https://developer.android.com/guide/topics/connectivity/usb/host.html for FAT12?
Please give me an answer or a link to the source in which there is a
description or examples.
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