I have shipped a non-trivial app written with Xamarin. Many others have as well. “Garbage collection” isn’t magic. If you create a reference that is attached to the root of your object graph and never detach it, it will not be collected. That’s not only true of Xamarin, but of C# on .NET, Java, etc. … Read more
You can calculate available number of columns, given a desired column width, and load the image as calculated. Define a static funtion to calculate as: public class Utility { public static int calculateNoOfColumns(Context context, float columnWidthDp) { // For example columnWidthdp=180 DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics(); float screenWidthDp = displayMetrics.widthPixels / displayMetrics.density; int noOfColumns = (int) … Read more
Follow these three steps: Create a key called FacebookAppID with a string value, and add the app ID there. Create a key called FacebookDisplayName with a string value, and add the Display Name you configured in the App Dashboard. Create an array key called URL types with a single array sub-item called URL Schemes. Give … Read more
can you check this API https://developer.android.com/reference/android/widget/ExpandableListView A view that shows items in a vertically scrolling two-level list
tried changing my target android version to 8.1 You need to change the Target Framework that is used to compile your android application, not the Target Android version (but assumably you would set these two to the same, read the Understanding Android API Levels link below. Visual Studio for Windows: Visual Studio for Mac: Target … Read more
This is a scenario which is easily resolved with dependency injection. Have a interface with the desired methods on your shared or PCL code, like: public interface IUserPreferences { void SetString(string key, string value); string GetString(string key); } Have a property on your App class of that interface: public class App { public static IUserPreferences … Read more
There are three basic levels of testing: The classic unit testing of pure .Net/Mono code via xUnit|NUnit Nothing new here, this is the same testing that .Net programmers have been doing all long and has nothing to do with the Xamarin platform frameworks Note: These tests are totally independent of Xamarin.Android|iOS|Mac On platform testing (including … Read more
The question is looking for a solution for macOS and the provided answer will not work for that. But I’ll keep the answer here for future reference, for those who find the post in search engines, looking for the solution for Windows. Windows – Open application from URL Some times you want to have a … Read more
Make sure that the proguard file you added is NOT a Unicode text file (U+FEFF byte order mark (BOM)) as proguard will fail… Enable diag. level logging for MSBuild and get the full error message. Proguard is being replaced by Google’s R8 If you are using the latest version of Xamarin, refer to this blog … Read more
The problem is that your BroadcastReceiver does not have the [BroadcastReceiver] attribute. This code works: AlarmReceiver.cs [BroadcastReceiver] public class AlarmReceiver : BroadcastReceiver { public override void OnReceive(Context context, Intent intent) { var message = intent.GetStringExtra(“message”); var title = intent.GetStringExtra(“title”); var resultIntent = new Intent(context, typeof(MainActivity)); resultIntent.SetFlags(ActivityFlags.NewTask | ActivityFlags.ClearTask); var pending = PendingIntent.GetActivity(context, 0, resultIntent, PendingIntentFlags.CancelCurrent); … Read more