Fix crash when preferences import list is opened for the second time (due to buggy implementation of ActivityResult and Contracts in early androidx)

* updated to newest version of fragments where bug is fixed
* catched exception and inform user with Toast
* refactor duplicated code in ImportExportPrefs

app/build.gradle

@@ -257,6 +257,7 @@ dependencies {
     implementation 'androidx.percentlayout:percentlayout:1.0.0'
     implementation "androidx.preference:preference-ktx:1.1.1"
     implementation "androidx.activity:activity-ktx:${activityVersion}"
+    implementation "androidx.fragment:fragment:${fragmentVersion}"
     implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
     implementation 'com.google.android.material:material:1.1.0'
 

app/src/main/java/info/nightscout/androidaps/plugins/general/maintenance/ImportExportPrefs.kt

@@ -215,12 +215,7 @@ class ImportExportPrefs @Inject constructor(
 
     fun importSharedPreferences(fragment: Fragment) {
         fragment.activity?.let { fragmentAct ->
-            val callForPrefFile = fragmentAct.registerForActivityResult(PrefsFileContract()) {
-                it?.let {
-                    importSharedPreferences(fragmentAct, it)
-                }
-            }
-            callForPrefFile.launch(null)
+            importSharedPreferences(fragmentAct)
         }
     }
 
@@ -230,7 +225,15 @@ class ImportExportPrefs @Inject constructor(
                 importSharedPreferences(activity, it)
             }
         }
-        callForPrefFile.launch(null)
+
+        try {
+            callForPrefFile.launch(null)
+        } catch (e: IllegalArgumentException) {
+            // this exception happens on some early implementations of ActivityResult contracts
+            // when registered and called for the second time
+            ToastUtils.errorToast(activity, "Please go back to main screen and try again.")
+            log.error(TAG, "Internal android framework exception", e)
+        }
     }
 
     private fun importSharedPreferences(activity: Activity, importFile: PrefsFile) {

build.gradle

@@ -12,6 +12,7 @@ buildscript {
         dagger_version = '2.28.1'
         coroutinesVersion = '1.3.7'
         activityVersion = '1.2.0-alpha06'
+        fragmentVersion = '1.3.0-alpha07'
         ormLiteVersion = "4.46"
     }
     repositories {