Showing Message Exception : null; @Override protected void onNewIntent(Intent intent) { try { UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE); HashMap<string,> deviceList = manager.getDeviceList(); Iterator<usbdevice> deviceIterator = deviceList.values() .iterator(); while (deviceIterator.hasNext()) { UsbDevice device = deviceIterator.next(); if(device==null) return ; String deviceName = device.getDeviceName(); listDeviceName.add(deviceName); } /*runOnUiThread(new Runnable() { @Override public void run() {*/ final ArrayAdapter<string> adapter = new ArrayAdapter<string>(this,android.R.layout.simple_list_item_1, listDeviceName); listview.setAdapter(adapter); /* } });*/ } catch(Exception e) { Toast.makeText(this,"Exception :"+e.getMessage(),Toast.LENGTH_SHORT).show(); } } }
if(device==null) return ;
continue
while
hasNext
false
if(device==null) continue ;
var
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