I have a similar problem when I want to format an unformatted tag. I am in Android 6. I have a proprietary device in Android 4.4 and the same code works well. Here is the code that I use and I send you the information of my tag.
public static void writeToTag(Tag paramTag, final NdefMessage paramNdefMessage) throws Exception
{
List localList = Arrays.asList(paramTag.getTechList());
if (localList.contains(NFC_TECH_NDEF)) {
Ndef localNdef = Ndef.get(paramTag);
localNdef.connect();
if (localNdef.getMaxSize() < paramNdefMessage.toByteArray().length) {
throw new E_TagTooSmallException();
}
localNdef.writeNdefMessage(paramNdefMessage);
localNdef.close();
return;
}
if (localList.contains(NFCTECH_NDEF_FORMATTABLE)) { //my Tag is NDefFormatable
NdefFormatable localNdefFormatable = NdefFormatable.get(paramTag);
localNdefFormatable.connect(); // OK
try {
localNdefFormatable.format(paramNdefMessage); //IO Exception here
} finally {
localNdefFormatable.close();
}
return;
}
throw new Exception("Tag is unsupported");
}
Thank you for your help !!
Related
Here are the relevant parts of my code:-
public class MainActivity extends Activity
implements SensorEventListener, OnNmeaMessageListener {
private LocationManager m_locationManager;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ac = this;
m_locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
}
...
protected void onResume() {
...
if (m_locationManager != null) {
m_gpsSensor = new SensorView(this);
try {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
m_locationManager.addNmeaListener(getMainExecutor(), this);
} else {
// no-op in later versions
m_locationManager.addNmeaListener(this);
}
m_gpsSensor.lineBreak("gps: ", "no messages yet");
} catch (Exception ignore) {
m_gpsSensor.lineBreak("gps: ", getString(R.string.permissiondenied));
}
topLayout.addView(m_gpsSensor);
}
}
#Override
public void onNmeaMessage(String message, long timestamp) {
long nanos = timestamp * 1000000;
if (nanos > m_gpsSensor.lastNanos + UPDATE_NANOS) {
m_gpsSensor.lastNanos = nanos;
m_gpsSensor.lineBreak("gps: ", message);
}
}
}
onNmeaMessage is never called (lastNanos is initialised to zero) and m_gpsSensor (a subclass of View) displays "no messages yet". My device does have GPS, and the app has permission to access it (otherwise it would display "Permission denied"), and GPS does work, because it can see satellites and get a fix with Satstat
I tried
addNmeaListener (OnNmeaMessageListener listener, Handler handler)
which doesn't work either. m_locationManager isn't null, because in that case it wouldn't display anything at all.
The device is a Samsung Galaxy S21 Ultra 5G running Android 12.
What am I doing wrong?
Apparently addNmeaListener doesn't start the GPS, and there doesn't seem to be an explicit call to do so. You have to call one of the requestLocationUpdates variants.
I have a xamarin forms app that can download files to "on my iphone" folder. But when I download a file on phone, I can go there and I can share it with another app.
But I want to prevent this. When I download a file from my app, I want the file not to be uploaded to another device from "on my iphone".
How to prevent this? Probably I can prevent this with mdm, but how?
Is there a way to prevent it with mdm managed app configuration. Some of my customers said that we can prevent this with the plist file in mdm. But I have very little information about mdm. How to do it with mdm?
I need a solution for ios and android. But especially for ios.
Thank you in advance.
Thank you for reply Jack.
I looked your sending thread and I tried it. But it didn't work for me.
I created MyUINavigationItem that is inherited from UINavigationItem. And I override SetRightBarButtonItem null. After I override UINavigationItem on PdfPreviewController that is inherited from QLPreviewController. And I set NavigationItem as MyUINavigationItem object. But it doesn't work for me. My codes is like these:
public class DocumentView : IDocumentView
{
void IDocumentView.DocumentView(string file, string title)
{
PdfPreviewController previewController = new PdfPreviewController();
if (File.Exists(file))
{
previewController.NavigationItem.SetRightBarButtonItem(null, false); //I tried this line as both comment and not comment but it didn't work
previewController.NavigationItem.SetRightBarButtonItems(null, false); //I tried this line as both comment and not comment but it didn't work
previewController.DataSource = new PDFPreviewControllerDataSource(NSUrl.FromFilename(file), title);
UIApplication.SharedApplication.KeyWindow.RootViewController.PresentViewController(previewController, true, null);
}
}
}
public class PdfPreviewController : QLPreviewController
{
MyUINavigationItem item = new MyUINavigationItem();
public override UINavigationItem NavigationItem => item;
}
public class MyUINavigationItem : UINavigationItem
{
public MyUINavigationItem()
{
}
public override void SetRightBarButtonItem(UIBarButtonItem item, bool animated)
{
//base.SetRightBarButtonItem(item, animated); //I tried this line as comment but it didn't work or
//base.SetRightBarButtonItem(null, animated); //I tried this line but it didn't work
}
public override void SetRightBarButtonItems(UIBarButtonItem[] items, bool animated)
{
//base.SetRightBarButtonItems(items, animated); //I tried this line as comment but it didn't work or
//base.SetRightBarButtonItems(null, animated); //I tried this line but it throwed exception
//base.SetRightBarButtonItems(new UIBarButtonItem[0], animated); //I tried this line but it didn't work
}
}
But after your suggestion I looked for enable or hide share button. And I could access child view controller of UINavigationController and I set RightBarButtonItem enable value false.
public class PdfPreviewController : QLPreviewController
{
public override void ViewDidAppear(bool animated)
{
try
{
ActionMenuControl();
}
catch (Exception ex)
{
}
}
public override void ViewDidLayoutSubviews()
{
try
{
ActionMenuControl();
}
catch (Exception ex)
{
}
}
public void ActionMenuControl()
{
try
{
if (this.ChildViewControllers.Length != 0)
{
var navigationController = this.ChildViewControllers.First() as UINavigationController;
if (navigationController.View.Subviews.Length != 0)
{
var layoutContainerView = navigationController.View.Subviews.FirstOrDefault(x => x is UINavigationBar) as UINavigationBar;
if (layoutContainerView != null)
{
if (layoutContainerView.Items.Length != 0)
{
var item = layoutContainerView.Items[0];
if (item.RightBarButtonItems.Length != 0)
item.RightBarButtonItem.Enabled = false;
}
}
}
var toolbar = navigationController.Toolbar;
if (toolbar != null)
{
if(toolbar.Items.Length != 0)
{
toolbar.Items[0].Enabled = false;
}
}
}
}
catch (Exception ex)
{
}
}
}
It works for right bar. But if opens mp3 files, share button appear on toolbar (on bottom) And I didn't access it. How can I do it for mp3 files? How to access toolbar? (Actually it doesn't work when opens and not move it. But if I open it and move it, it works (because it enters ViewDidLayoutSubviews events))
Sorry for long reply. But I wanted to tell about what I did. Because maybe I did missed something.
I'm currently trying to add some Bluetooth functionality to my app. I want to be able to change the Bluetooth Tethering on or off, as well as check its status.
I found the Java code on StackOverflow: How to check Bluetooth tethering status programmatically in Android
I have translated it into C#, but I don't seem to be able to get any result.
Regardless of the tethering setting, it always shows the toast with "Tethering:false", and the setBluetoothTethering doesn't change anything.
Any idea what I'm missing?
Here's my code:
[...]
try
{
Class classBluetoothPan = Class.ForName("android.bluetooth.BluetoothPan");
Method mBTPanConnect = classBluetoothPan.GetDeclaredMethod("connect", Class.FromType(typeof(BluetoothDevice)));
Constructor BTPanCtor = classBluetoothPan.GetDeclaredConstructor(Class.FromType(typeof(Context)), Class.FromType(typeof(IBluetoothProfileServiceListener)));
BTPanCtor.Accessible = true;
Java.Lang.Object BTSrvInstance = BTPanCtor.NewInstance(Activity, new BTPanServiceListener(Activity));
Method isTetheringOnMethod = classBluetoothPan.GetDeclaredMethod("isTetheringOn", null);
var isTetheringOn = isTetheringOnMethod.Invoke(BTSrvInstance);
Toast.MakeText(Activity, "Tethering:" + isTetheringOn, ToastLength.Short).Show();
Method setBluetoothTetheringMethod = classBluetoothPan.GetDeclaredMethod("setBluetoothTethering", new Class[1] { Class.FromType(typeof(bool)) });
setBluetoothTetheringMethod.Invoke(BTSrvInstance, true);
// tether = !tether;
}
catch (ClassNotFoundException e)
{
e.PrintStackTrace();
}
catch (Java.Lang.Exception e)
{
e.PrintStackTrace();
}
[...]
public class BTPanServiceListener : Java.Lang.Object, IBluetoothProfileServiceListener
{
private Activity _activity;
public BTPanServiceListener(Activity activity)
{
_activity = activity;
}
public void OnServiceConnected([GeneratedEnum] ProfileType profile, IBluetoothProfile proxy)
{
// throw new NotImplementedException();
}
public void OnServiceDisconnected([GeneratedEnum] ProfileType profile)
{
// throw new NotImplementedException();
}
}
I figured out how to enable Bluetooth tethering via setBluetoothTethering.
I wrote an entire blog about this
You can find the final code here
I assume that isTetheringOn works in the same way
I need to print a picture on client side. I used this as a template. My PrintUI looks like this:
#Override
protected void init(VaadinRequest request) {
Item item = ..get item ..
StreamResource imageStream = ... build image dynamically ...
Image image = new Image(item.getName(), imageStream);
image.setWidth("100%");
setContent(image);
setWidth("100%");
// Print automatically when the window opens
JavaScript.getCurrent().execute("setTimeout(function() {print(); self.close();}, 0);");
}
This works so far in IE but in chrome it opens the printing preview showing an empty page. The problem is that the image is loaded in some way that chrome does not wait for it and starts the printing preview immideatly.
To verify this, I tried: (setting a 5sec timeout)
JavaScript.getCurrent().execute("setTimeout(function() {print(); self.close();}, 0);");
Then it works in IE and Chrome, but its of course an ugly hack, and if the connection is slower than 5sec, then again it will fail.
In pure JS it would work like this, but Im not sure how to reference the element from vaadin in cient-side js. Any ideas?
You can use AbstractJavascriptExtension.
Example extension class:
#JavaScript({ "vaadin://scripts/connector/wait_for_image_load_connector.js" })
public class WaitForImageLoadExtension extends AbstractJavaScriptExtension {
private List<ImageLoadedListener> imageLoadedListeners = new ArrayList<>();
public interface ImageLoadedListener {
void onImageLoaded();
}
public void extend(Image image) {
super.extend(image);
addFunction("onImageLoaded", new JavaScriptFunction() {
#Override
public void call(JsonArray arguments) {
for (ImageLoadedListener imageLoadedListener : imageLoadedListeners) {
if (imageLoadedListener != null) {
imageLoadedListener.onImageLoaded();
}
}
}
});
}
public void addImageLoadedListener(ImageLoadedListener listener) {
imageLoadedListeners.add(listener);
}
}
and javascript connector (placed in wait_for_image_load_connector.js) with the waiting method you have linked:
window.your_package_WaitForImageLoadExtension = function() {
var connectorId = this.getParentId();
var img = this.getElement(connectorId);
if (img.complete) {
this.onImageLoaded();
} else {
img.addEventListener('load', this.onImageLoaded)
img.addEventListener('error', function() {
alert('error');
})
}
}
Then you can do something like that:
Image image = new Image(item.getName(), imageStream);
WaitForImageLoadExtension ext = new WaitForImageLoadExtension();
ext.extend(image);
ext.addImageLoadedListener(new ImageLoadedListener() {
#Override
public void onImageLoaded() {
JavaScript.eval("print()");
}
});
In your case, when calling print() is the only thing you want to do after the image is loaded, you can also do it without server-side listener by just calling it in the connector:
if (img.complete) {
print();
} else {
img.addEventListener('load', print)
img.addEventListener('error', function() {
alert('error');
})
}
Our application should have the functionality to save Application files to Google Drive. Of course, using the local configured account.
From Android API i tried to figure out some clue. But android API with Xamarin implementation seems very tough for me.
I have installed Google Play Services- Drive from Xamarin Components but there are no examples listed from which we can refer the flow and functionality.
The basic steps (see the link below for full details):
Create GoogleApiClient with the Drive API and Scope
Try to connect (login) the GoogleApiClient
The first time you try to connect it will fail as the user has not selected a Google Account that should be used
Use StartResolutionForResult to handle this condition
When GoogleApiClient is connected
Request a Drive content (DriveContentsResult) to write the file contents to.
When the result is obtained, write data into the Drive content.
Set the metadata for the file
Create the Drive-based file with the Drive content
Note: This example assumes that you have Google Drive installed on your device/emulator and you have registered your app in Google's Developer API Console with the Google Drive API Enabled.
C# Example:
[Activity(Label = "DriveOpen", MainLauncher = true, Icon = "#mipmap/icon")]
public class MainActivity : Activity, GoogleApiClient.IConnectionCallbacks, IResultCallback, IDriveApiDriveContentsResult
{
const string TAG = "GDriveExample";
const int REQUEST_CODE_RESOLUTION = 3;
GoogleApiClient _googleApiClient;
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.Main);
Button button = FindViewById<Button>(Resource.Id.myButton);
button.Click += delegate
{
if (_googleApiClient == null)
{
_googleApiClient = new GoogleApiClient.Builder(this)
.AddApi(DriveClass.API)
.AddScope(DriveClass.ScopeFile)
.AddConnectionCallbacks(this)
.AddOnConnectionFailedListener(onConnectionFailed)
.Build();
}
if (!_googleApiClient.IsConnected)
_googleApiClient.Connect();
};
}
protected void onConnectionFailed(ConnectionResult result)
{
Log.Info(TAG, "GoogleApiClient connection failed: " + result);
if (!result.HasResolution)
{
GoogleApiAvailability.Instance.GetErrorDialog(this, result.ErrorCode, 0).Show();
return;
}
try
{
result.StartResolutionForResult(this, REQUEST_CODE_RESOLUTION);
}
catch (IntentSender.SendIntentException e)
{
Log.Error(TAG, "Exception while starting resolution activity", e);
}
}
public void OnConnected(Bundle connectionHint)
{
Log.Info(TAG, "Client connected.");
DriveClass.DriveApi.NewDriveContents(_googleApiClient).SetResultCallback(this);
}
protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
base.OnActivityResult(requestCode, resultCode, data);
if (requestCode == REQUEST_CODE_RESOLUTION)
{
switch (resultCode)
{
case Result.Ok:
_googleApiClient.Connect();
break;
case Result.Canceled:
Log.Error(TAG, "Unable to sign in, is app registered for Drive access in Google Dev Console?");
break;
case Result.FirstUser:
Log.Error(TAG, "Unable to sign in: RESULT_FIRST_USER");
break;
default:
Log.Error(TAG, "Should never be here: " + resultCode);
return;
}
}
}
void IResultCallback.OnResult(Java.Lang.Object result)
{
var contentResults = (result).JavaCast<IDriveApiDriveContentsResult>();
if (!contentResults.Status.IsSuccess) // handle the error
return;
Task.Run(() =>
{
var writer = new OutputStreamWriter(contentResults.DriveContents.OutputStream);
writer.Write("Stack Overflow");
writer.Close();
MetadataChangeSet changeSet = new MetadataChangeSet.Builder()
.SetTitle("New Text File")
.SetMimeType("text/plain")
.Build();
DriveClass.DriveApi
.GetRootFolder(_googleApiClient)
.CreateFile(_googleApiClient, changeSet, contentResults.DriveContents);
});
}
public void OnConnectionSuspended(int cause)
{
throw new NotImplementedException();
}
public IDriveContents DriveContents
{
get
{
throw new NotImplementedException();
}
}
public Statuses Status
{
get
{
throw new NotImplementedException();
}
}
}
Ref: https://developers.google.com/drive/android/create-file