Short answer: the correct, common, and reliable scenario is to bond. Bonding means the connection is secure and the link is trusted. It means that your local device will usually find the remote device even if its address is changing. Pairing/bonding is recommended practice in Bluetooth for security and privacy reasons. Long answer: since its … Read more
Unsupported major.minor version 52.0 This error message is caused by an incompatibility with the Java JDK: Android SDK Build-tools versions 24 and higher require Java JDK 8 (1.8), whereas earlier versions were still compatible with Java JDK 7 (1.7). (This resembles older answers about the same error.) Steps to update: Update to Java JDK 8. … Read more
Xamarin.Forms Pros Create one UI for all platforms Use basic components that are available on all platforms (like Buttons, Textfields, Spinners etc.) No need to learn all the native UI frameworks Fast cross platform development process Custom native renderers give you the ability to adjust the appearance and feeling of controls Cons It’s still a … Read more
As a design methodology, its better to implement MVVM as a subclass and implement it to your ViewModel. Sample Implementation: public class ObservableProperty : INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; protected void OnPropertyChanged(string propertyName) { var handler = PropertyChanged; if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName)); } } I also strongly suggest implementing ICommand as … Read more
I had the same issue. VS 2015 can launch the VS emulator but can’t deploy the app. I was able to solve the issue like this: Launch the emulator (F5 in VS, then cancel the deployment using the Build/Cancel menu) Click on the chevron icon (ยป) in the toolbar to the right of the emulator … Read more
You are looking for the root of GetExternalFilesDir, just pass a null: Example: var externalAppPathNoSec = GetExternalFilesDir(string.Empty).Path; Note: This is a Context-based instance method, you can access it via the Android application context, an Activity, etc… (see the link below to the Android Context docs) Shared storage may not always be available, since removable media … Read more
Here is an example showing how you can control the visibility or navigation to your pages based on the login status of the user. By default Shell will always displays initially the first element defined in AppShell.xaml, in this case it will be Login.xaml page. In the below example “Page3” will be visible initially because … Read more
Without more details (like seeing some code). 1) Do not block the UI thread, this can cause a SIGABRT as the OS will kill a non-responsive app. bind and unbind on every activity when i switch for like 11 times it crashes my app 2) Make sure that in your OnDestroy within your Activity you … Read more
After hours and hours of research, and applying following steps I finally get it working: 1) Repair Android SDK – go to Programs and Features > Microsoft Visual Studio Emulator for Android > Change and hit “Repair” 2) Remove All Hyper-V virtual switches – go to Hyper-V > Virtual switch manager > Remove all virtual … Read more
The Xamarin.Android equivalent of SharedPreferences is an interface called ISharedPreferences. Use it in the same way, and you will be able to easily port Android code across. For example, to save a true/false bool using some Context you can do the following: ISharedPreferences prefs = PreferenceManager.GetDefaultSharedPreferences (mContext); ISharedPreferencesEditor editor = prefs.Edit (); editor.PutBoolean (“key_for_my_bool_value”, mBool); … Read more