conditional screenshot prevention (#391)

Co-authored-by: Jakob Möller <jakob.moeller@sap.com>

Corona-Warn-App/src/main/java/de/rki/coronawarnapp/CoronaWarnApplication.kt

@@ -7,6 +7,7 @@ import android.content.Context
 import android.content.IntentFilter
 import android.content.pm.ActivityInfo
 import android.os.Bundle
+import android.view.WindowManager
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.LifecycleObserver
 import androidx.lifecycle.OnLifecycleEvent
@@ -94,13 +95,15 @@ class CoronaWarnApplication : Application(), LifecycleObserver,
 
     @SuppressLint("SourceLockedOrientationActivity")
     override fun onActivityCreated(activity: Activity, savedInstanceState: Bundle?) {
-        // prevents screenshot of the app for all activities
-        // TODO temporarily removed screenshot prevention for testing purposes
-        /*
-        activity.window.setFlags(
-            WindowManager.LayoutParams.FLAG_SECURE,
-            WindowManager.LayoutParams.FLAG_SECURE
-        )*/
+        // prevents screenshot of the app for all activities,
+        // except for deviceForTesters build flavor, which is used for testing
+        if (BuildConfig.FLAVOR != "deviceForTesters") {
+            activity.window.setFlags(
+                WindowManager.LayoutParams.FLAG_SECURE,
+                WindowManager.LayoutParams.FLAG_SECURE
+            )
+        }
+
         // set screen orientation to portrait
         activity.requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_USER_PORTRAIT
     }

Corona-Warn-App/src/main/java/de/rki/coronawarnapp/ui/settings/SettingsResetFragment.kt

@@ -60,7 +60,6 @@ class SettingsResetFragment : Fragment() {
         }
     }
 
-    // TODO verify that all local data is deleted
     private fun deleteAllAppContent() {
         lifecycleScope.launch {
             try {