From 4dd8ecfec192e837a80fdcaca640fc3ab4f66d3d Mon Sep 17 00:00:00 2001
From: oliexdev <olie.xdev@googlemail.com>
Date: Mon, 6 Jul 2020 18:43:50 +0200
Subject: [PATCH] exit app on top level fragments on back button pressed, see
 issue #592

---
 .../com/health/openscale/gui/graph/GraphFragment.java | 10 ++++++++++
 .../openscale/gui/overview/OverviewFragment.java      | 10 ++++++++++
 .../openscale/gui/statistic/StatisticsFragment.java   | 10 ++++++++++
 .../com/health/openscale/gui/table/TableFragment.java | 11 +++++++++++
 4 files changed, 41 insertions(+)

diff --git a/android_app/app/src/main/java/com/health/openscale/gui/graph/GraphFragment.java b/android_app/app/src/main/java/com/health/openscale/gui/graph/GraphFragment.java
index 9a9880c4..9263632f 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/graph/GraphFragment.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/graph/GraphFragment.java
@@ -32,6 +32,7 @@ import android.widget.PopupMenu;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import androidx.activity.OnBackPressedCallback;
 import androidx.fragment.app.Fragment;
 import androidx.lifecycle.Observer;
 import androidx.navigation.Navigation;
@@ -287,6 +288,15 @@ public class GraphFragment extends Fragment {
             }
         });
 
+        OnBackPressedCallback onBackPressedCallback = new OnBackPressedCallback(true) {
+            @Override
+            public void handleOnBackPressed() {
+                requireActivity().finish();
+            }
+        };
+
+        requireActivity().getOnBackPressedDispatcher().addCallback(getViewLifecycleOwner(), onBackPressedCallback);
+
         return graphView;
     }
 
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/overview/OverviewFragment.java b/android_app/app/src/main/java/com/health/openscale/gui/overview/OverviewFragment.java
index 0b830229..83d86c51 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/overview/OverviewFragment.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/overview/OverviewFragment.java
@@ -34,6 +34,7 @@ import android.widget.TableLayout;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import androidx.activity.OnBackPressedCallback;
 import androidx.fragment.app.Fragment;
 import androidx.lifecycle.Observer;
 import androidx.navigation.Navigation;
@@ -258,6 +259,15 @@ public class OverviewFragment extends Fragment {
             }
         });
 
+        OnBackPressedCallback onBackPressedCallback = new OnBackPressedCallback(true) {
+            @Override
+            public void handleOnBackPressed() {
+                requireActivity().finish();
+            }
+        };
+
+        requireActivity().getOnBackPressedDispatcher().addCallback(getViewLifecycleOwner(), onBackPressedCallback);
+
         return overviewView;
     }
 
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/statistic/StatisticsFragment.java b/android_app/app/src/main/java/com/health/openscale/gui/statistic/StatisticsFragment.java
index 533bea0b..2a443698 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/statistic/StatisticsFragment.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/statistic/StatisticsFragment.java
@@ -24,6 +24,7 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.widget.TextView;
 
+import androidx.activity.OnBackPressedCallback;
 import androidx.fragment.app.Fragment;
 import androidx.lifecycle.Observer;
 
@@ -151,6 +152,15 @@ public class StatisticsFragment extends Fragment {
             }
         });
 
+        OnBackPressedCallback onBackPressedCallback = new OnBackPressedCallback(true) {
+            @Override
+            public void handleOnBackPressed() {
+                requireActivity().finish();
+            }
+        };
+
+        requireActivity().getOnBackPressedDispatcher().addCallback(getViewLifecycleOwner(), onBackPressedCallback);
+
         return statisticsView;
     }
 
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/table/TableFragment.java b/android_app/app/src/main/java/com/health/openscale/gui/table/TableFragment.java
index 540e60d1..2cb252e3 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/table/TableFragment.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/table/TableFragment.java
@@ -27,6 +27,7 @@ import android.widget.LinearLayout;
 import android.widget.TableRow;
 import android.widget.TextView;
 
+import androidx.activity.OnBackPressedCallback;
 import androidx.fragment.app.Fragment;
 import androidx.lifecycle.Observer;
 import androidx.navigation.Navigation;
@@ -95,6 +96,16 @@ public class TableFragment extends Fragment {
             }
         });
 
+        OnBackPressedCallback onBackPressedCallback = new OnBackPressedCallback(true) {
+            @Override
+            public void handleOnBackPressed() {
+                requireActivity().finish();
+            }
+        };
+
+        requireActivity().getOnBackPressedDispatcher().addCallback(getViewLifecycleOwner(), onBackPressedCallback);
+
+
         return tableView;
     }