xamarin.android

问题 I have a one picker and I have one Firebase Database. And I wanna add data my picker. How can I add data from my firebase database in a picker in my Xamarin form ? 来源： https://stackoverflow.com/questions/63636700/xamarin-and-firebase-picker-data

问题 I have the following functionality given below: When clicking on details, i want the text that is displayed on the contentview shall be displayed on the new detailspage that is created by push async. How can I send parameters containing the info given in the content, e.g. title, category and description. I have a tap gesture recognizer: <Label.GestureRecognizers> <TapGestureRecognizer Tapped="TapGestureRecognizer_Tapped"/> </Label.GestureRecognizers> That then leads to creating a new page

问题 I have the following functionality given below: When clicking on details, i want the text that is displayed on the contentview shall be displayed on the new detailspage that is created by push async. How can I send parameters containing the info given in the content, e.g. title, category and description. I have a tap gesture recognizer: <Label.GestureRecognizers> <TapGestureRecognizer Tapped="TapGestureRecognizer_Tapped"/> </Label.GestureRecognizers> That then leads to creating a new page

问题 I want to rotate an ImageView programmatically in my Activity. Currently I couldn't find any solutions for Xamarin which works and translated solutions from Android didn't work either. Does anybody know how to rotate an ImageView? This code for example just gives me a NullPoinerException and I don't know why: [Trace] error opening trace file: No such file or directory (2) [Mono] Image addref mscorlib[0xb7c3b4b8] -> mscorlib.dll[0xb7c771b0]: 1 [Mono] AOT module 'mscorlib.dll.so' not found:

问题 I am trying to install an .apk I have downloaded to the downloads folder in Android 7. I have tried the way recommended in a number of StackOverflow posts and here https://inthecheesefactory.com/blog/how-to-share-access-to-file-with-fileprovider-on-android-nougat/en by using a FileProvider: File file = new File(fileUri); //using Android.Support.V4.Content; var downloadUri = FileProvider.GetUriForFile(context,context.ApplicationContext.PackageName + ".com.package.name.provider", file); Intent

问题 I am trying to install an .apk I have downloaded to the downloads folder in Android 7. I have tried the way recommended in a number of StackOverflow posts and here https://inthecheesefactory.com/blog/how-to-share-access-to-file-with-fileprovider-on-android-nougat/en by using a FileProvider: File file = new File(fileUri); //using Android.Support.V4.Content; var downloadUri = FileProvider.GetUriForFile(context,context.ApplicationContext.PackageName + ".com.package.name.provider", file); Intent

问题 How to use a custom font in skiasharp from Xamarin forms. I tried paint.Typeface = SKTypeface.FromFamilyName("CoText_Bd"); and paint.Typeface = SKTypeface.FromFile("CoText_Bd"); But both didn't worked out. Do i need to access the path of the font using dependency service ? 回答1: If you want trully multiplatform solution, put all SkiaSharp/PaintCode drawing Code into .NET standard library, including fonts as embedded resource (Don't forget to set Build action to Embedded resource!). Then you

问题 I have following code to fire an alarm at exact time. When my app goes to sleep/background, Alarm does not FIRE , however as soon as I unlock my phone, then it fires right away. Intent i = new Intent(this, typeof(MyReceiver)); i.PutExtra("Speaker", txtSpeaker.Text); PendingIntent pi = PendingIntent.GetBroadcast(this, 0, i, 0); string _date = DateTime.Today.ToString("MM-dd-yyyy") ; string _time = tpick.Hour + ":" + tpick.Minute; DateTime scheduleAt = Convert.ToDateTime(_date).Add(TimeSpan

问题 I have following code to fire an alarm at exact time. When my app goes to sleep/background, Alarm does not FIRE , however as soon as I unlock my phone, then it fires right away. Intent i = new Intent(this, typeof(MyReceiver)); i.PutExtra("Speaker", txtSpeaker.Text); PendingIntent pi = PendingIntent.GetBroadcast(this, 0, i, 0); string _date = DateTime.Today.ToString("MM-dd-yyyy") ; string _time = tpick.Hour + ":" + tpick.Minute; DateTime scheduleAt = Convert.ToDateTime(_date).Add(TimeSpan

问题 I need suggestion on getting a list of PDF files from the external storage in android device 回答1: 1.You could traverse the folder and filter the PDF files: public void Search_Pdf_Dir(File dir) { string pdfPattern = ".pdf"; File[] FileList = dir.ListFiles(); if (FileList != null) { for (int i = 0; i < FileList.Length; i++) { if (FileList[i].IsDirectory) { Search_Pdf_Dir(FileList[i]); } else { if (FileList[i].Name.EndsWith(pdfPattern)) { //here you have that file. } } } } } then you could call