Android USB Detection - Android Discussion Boards

David Crow31-Jan-17 17:23

31-Jan-17 17:23

Define "not working."

Since you asked for ALL_EVENTS, your event handler is potentially going to get called for a lot of events, yet you are not checking for any of them. Is that intentional?

You are calling listFiles() once before startWatching(). I would think that you'd want to call listFiles() only after a CREATE event.

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Re: Alarm Manager

Pavlex431-Jan-17 20:22

Pavlex4

31-Jan-17 20:22

I have changed code to this but it still won't show message when cable is connected or disconnected !!!!

Java

public class MainActivity extends AppCompatActivity
{
    private Process suProcess;
    private static int conn_length = -1;
    File directory = new File("/sys/bus/usb/devices");
    File[] contents;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        getRoot();



        FileObserver observer = new FileObserver("/sys/bus/usb/devices")
        {
            @Override
            public void onEvent(int event, String file)
            {
                if(event == FileObserver.CREATE)
                {
                    contents = directory.listFiles();

                    if (contents.length == conn_length)
                    {
                        return;
                    }
                    else
                    {
                        conn_length = contents.length;
                    }

                    if (conn_length == 0)
                    {

                        Toast.makeText(MainActivity.this, "otg disconnected", Toast.LENGTH_SHORT).show();
                    }
                    else
                    {
                        Toast.makeText(MainActivity.this, "otg connected", Toast.LENGTH_SHORT).show();
                    }
                }
            }
        };
        observer.startWatching();
    }

    private void getRoot()
    {
        try
        {
            suProcess = Runtime.getRuntime().exec("su");
        }
        catch (IOException e)
        {

        }
    }
}

Re: Alarm Manager

David Crow1-Feb-17 2:14

David Crow

1-Feb-17 2:14

Did you set a breakpoint in the event handler? Using the debugger, what is the value of event, contents, and conn_length?

Android OTG Detect App

Pavlex427-Jan-17 10:54

Pavlex4

27-Jan-17 10:54

How to use app to detect when otg cable is plugged in and when it's plugged out? Is there intent for otg cable like this for usb devices: "android.hardware.usb.action.USB_DEVICE_ATTACHED"

I have created app like this but I only detects flash drive not otg cable:

Java

public class MainActivity extends AppCompatActivity
{

    private TextView mInfo;
    private Logger mLogger;
    private HashMap<UsbDevice, UsbDataBinder> mHashMap = new HashMap<UsbDevice, UsbDataBinder>();
    private UsbManager mUsbManager;
    private PendingIntent mPermissionIntent;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mInfo = (TextView)findViewById(R.id.log);

        mLogger = new Logger(this);
        mLogger.setMode(Logger.MODE_TOAST);

        mUsbManager = (UsbManager) getSystemService(Context.USB_SERVICE);

        usbConnection();
    }

    private void usbConnection() {
        IntentFilter filter = new IntentFilter(UsbManager.ACTION_USB_DEVICE_ATTACHED);
        registerReceiver(mUsbAttachReceiver , filter);
        filter = new IntentFilter(UsbManager.ACTION_USB_DEVICE_DETACHED);
        registerReceiver(mUsbDetachReceiver , filter);

        mPermissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(ACTION_USB_PERMISSION), 0);
        filter = new IntentFilter(ACTION_USB_PERMISSION);
        registerReceiver(mUsbReceiver, filter);

        showDevices();
    }

    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(mUsbDetachReceiver);
        unregisterReceiver(mUsbAttachReceiver);
        unregisterReceiver(mUsbReceiver);
    };

    BroadcastReceiver mUsbDetachReceiver = new BroadcastReceiver() {
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();

            if (UsbManager.ACTION_USB_DEVICE_DETACHED.equals(action)) {
                UsbDevice device = (UsbDevice)intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
                if (device != null) {
                    // call your method that cleans up and closes communication with the device
                    UsbDataBinder binder = mHashMap.get(device);
                    if (binder != null) {
                        binder.onDestroy();
                        mHashMap.remove(device);
                        Toast.makeText(MainActivity.this, "Attached!", Toast.LENGTH_SHORT).show();
                    }
                }
            }
        }
    };

    BroadcastReceiver mUsbAttachReceiver = new BroadcastReceiver() {
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();

            if (UsbManager.ACTION_USB_DEVICE_ATTACHED.equals(action)) {
                showDevices();
                Toast.makeText(MainActivity.this, "Detached!", Toast.LENGTH_SHORT).show();
            }
        }
    };

    private static final String ACTION_USB_PERMISSION = "com.android.example.USB_PERMISSION";
    private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {

        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (ACTION_USB_PERMISSION.equals(action)) {
                synchronized (this) {
                    UsbDevice device = (UsbDevice) intent
                            .getParcelableExtra(UsbManager.EXTRA_DEVICE);

                    if (intent.getBooleanExtra(
                            UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
                        if (device != null) {
                            // call method to set up device communication
                            UsbDataBinder binder = new UsbDataBinder(mUsbManager, device);
                            mHashMap.put(device, binder);
                            Toast.makeText(MainActivity.this, "Permission Granted!", Toast.LENGTH_SHORT).show();
                        }
                    } else {
                        // Log.d(TAG, "permission denied for device " + device);
                    }
                }
            }
        }
    };

    private void showDevices() {
        HashMap<String, UsbDevice> deviceList = mUsbManager.getDeviceList();
        Iterator<UsbDevice> deviceIterator = deviceList.values().iterator();
        while(deviceIterator.hasNext()){
            UsbDevice device = deviceIterator.next();
            mUsbManager.requestPermission(device, mPermissionIntent);
            //your code
            mLogger.log("usb", "name: " + device.getDeviceName() + ", " +
                    "ID: " + device.getDeviceId());
            mInfo.append(device.getDeviceName() + "\n");
            mInfo.append(device.getDeviceId() + "\n");
            mInfo.append(device.getDeviceProtocol() + "\n");
            mInfo.append(device.getProductId() + "\n");
            mInfo.append(device.getVendorId() + "\n");
        }
    }

    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();

    }
}

Re: Android OTG Detect App

Richard MacCutchan27-Jan-17 22:05

Richard MacCutchan

27-Jan-17 22:05

Why have you reposted this question? You have already been given a number of suggestions below.

Simple HTTP Post Request - application/json

Django_Untaken27-Jan-17 9:21

Django_Untaken

27-Jan-17 9:21

Hello there. I am trying to make a simple http POST request using HttpUrlConnection. Problem is that response code is 200 but the response message NOT success.

You can see that I set all the necessary header parameters. I am supposed to get success message. But I get {"status":false,"message":"Invalid access"} with responseCode = 200.

Below is the code (I am developing against Lollipop)

Java

protected SubmitRequestTask.ResponseObject doInBackground(Object... object)
{
	String encodedStr = URLEncoder.encode(object.getDataToSendRAW(), "UTF-8");

	BufferedReader reader = null;
        int responseCode = -1;
	try
        {
            URL url = new URL(/*My SERVER URL*/);  //Converting address String to URL

	      Map<String, String> headerParams = new HashMap<String, String>();
	      headerParams.put("Accept", "application/json");
            headerParams.put("Content-Type", "application/json");

            HttpUrlConnection networkConnection = MakeRequest(
                    url,
                    "POST",
                    headerParams,
                    null);

            if(networkConnection == null)
                return new ResponseObject(-1, "Uknown Error");

            StringBuilder sb = new StringBuilder();
            reader = new BufferedReader(new InputStreamReader(networkConnection.getInputStream()));

            while ((response = reader.readLine()) != null)
                sb.append(response + "\n");

            response = sb.toString();
	}
	catch(Exception ex) {}
        finally { 
            responseCode = networkConnection.getResponseCode();
            networkConnection.disconnect();
        }

return new ResponseObject(responseCode, response);
}

private HttpUrlConnection MakeRequest(URL url, String method, Map<String, String> headerParams, NetworkConfig config)
{
	HttpURLConnection htp_url_connection = (HttpURLConnection) url.openConnection();
	htp_url_connection.setRequestMethod(method);
    
        if (headerParams != null && method.trim().toLowerCase().equals("post"))
        {
                htp_url_connection.setDoOutput(true);

                for (Map.Entry<String, String> entry : headerParams.entrySet()) {
                   (htp_url_connection.setRequestProperty(entry.getKey(), entry.getValue());
                }

                if (encodedStr.trim().length() > 0) {
                    OutputStreamWriter writer = new OutputStreamWriter(htp_url_connection.getOutputStream());
                    writer.write(encodedStr);
                    writer.flush();
                }
	}

	htp_url_connection.setConnectTimeout(5000);
	int responseCode = htp_url_connection.getResponseCode();

        if(responseCode == HttpURLConnection.HTTP_OK /*200*/)
                return htp_url_connection;
}

Sample JSON data (which I encode in doInBackground).

HTML

{
"plot_unique_id":"355618",
"plot_physical_address":"owner",
"plot_id":"355617",
"location":"31.475885,74.3422574",
"action_type":"1",
"plot_sub_id":"1",
"apk_version":"1.0",
"imei_no":"862037029044152",
"owners":[......]
}

What could be the problem?? Thanks for any input.

Re: Simple HTTP Post Request - application/json

Richard MacCutchan27-Jan-17 22:03

Richard MacCutchan

27-Jan-17 22:03

That is correct; the HTTP response is 200 telling you that the server responded with some data. The response data is a JSON reply which contains information about the JSON request. You need to contact the owners of the website, or the documentation, to find out why it returned the "Invalid access" status.

Android USB Detection

Pavlex421-Jan-17 11:18

Pavlex4

21-Jan-17 11:18

How to detect OTG Cable when plugged in inside micro usb port and enable switch inside app?