Eventually fix some rare crashes

app/src/main/java/io/timelimit/android/ui/view/SafeViewFlipper.kt

@@ -0,0 +1,35 @@
+/*
+ * Open TimeLimit Copyright <C> 2019 Jonas Lochmann
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+package io.timelimit.android.ui.view
+
+import android.content.Context
+import android.util.AttributeSet
+import android.widget.ViewFlipper
+
+// based on https://stackoverflow.com/a/8208874
+// this should fix some rare crashes at Android 4.4
+class SafeViewFlipper: ViewFlipper {
+    constructor(context: Context) : this(context, null)
+    constructor(context: Context, attrs: AttributeSet?) : super(context, attrs)
+
+    override fun onDetachedFromWindow() {
+        try {
+            super.onDetachedFromWindow()
+        } catch (ex: IllegalArgumentException) {
+            stopFlipping()
+        }
+    }
+}

app/src/main/res/layout/copy_blocked_time_areas_dialog_fragment.xml

@@ -38,7 +38,7 @@
             android:layout_width="match_parent"
             android:layout_height="wrap_content" />
 
-        <ViewFlipper
+        <io.timelimit.android.ui.view.SafeViewFlipper
             android:id="@+id/flipper"
             android:measureAllChildren="false"
             android:layout_width="match_parent"
@@ -111,6 +111,6 @@
                     android:layout_height="wrap_content" />
 
             </LinearLayout>
-        </ViewFlipper>
+        </io.timelimit.android.ui.view.SafeViewFlipper>
     </LinearLayout>
 </layout>

app/src/main/res/layout/fragment_add_user.xml

@@ -22,7 +22,7 @@
 
     <data></data>
 
-    <ViewFlipper
+    <io.timelimit.android.ui.view.SafeViewFlipper
         android:layout_width="match_parent"
         android:id="@+id/flipper"
         android:layout_height="match_parent">
@@ -101,5 +101,5 @@
         <include layout="@layout/circular_progress_indicator" />
 
         <include android:id="@+id/missing_auth_view" layout="@layout/fragment_add_user_missing_authentication" />
-    </ViewFlipper>
+    </io.timelimit.android.ui.view.SafeViewFlipper>
 </layout>

app/src/main/res/layout/new_login_fragment.xml

@@ -15,7 +15,7 @@
     along with this program. If not, see <https://www.gnu.org/licenses/>.
 -->
 <layout xmlns:android="http://schemas.android.com/apk/res/android">
-    <ViewFlipper
+    <io.timelimit.android.ui.view.SafeViewFlipper
         android:measureAllChildren="false"
         android:id="@+id/switcher"
         android:layout_width="match_parent"
@@ -27,5 +27,5 @@
         <include android:id="@+id/enter_password"
             layout="@layout/new_login_fragment_password" />
 
-    </ViewFlipper>
+    </io.timelimit.android.ui.view.SafeViewFlipper>
 </layout>