android: Don't require that user presses 'Back' twice to exit

Drop the "Press back again to quit" info shown when pressing
"Back" in the file selection dialog in Android Viewer and
just quit the app right away.

It was originally added in

    commit d1f671e053864d0bf54d04a855761b43a7f5a9c4
    Date:   Wed Jun 10 19:04:22 2015 +0200

        tdf#87434: android: system back key to go one level up

        Added an additional check so back has to be pressed twice on the root
        folder to actually leave the application. It's a check seen in many
        other apps.

but I don't really see any need to bother the user
about pressing "Back" again. Nothing is lost at
this stage when quitting the app, and I haven't
seen anything similar in many current apps myself
(but have rather seen some extra confirmation dialogs
disappear from desktop applications over the last
years).

The original request in tdf#87434 to go one level up
in the directory hierarchy is unaffected by this,
though this only applies for the custom widgets
to browse the file system, which will potentially be
dropped in the future anyway, now that support
for the system file picker has been added in

    commit d678ee309b02b4cc8af29a097bf5053b8b1b4e06
    Author: Michael Weghorn <m.weghorn@posteo.de>
    Date:   Fri Mar 19 14:29:36 2021 +0100

        tdf#129833 android: Allow opening files using system file picker

Change-Id: Ib324b7f0b82427b04c7708665ff7492a758eec9b
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/113413
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>

4 files changed, 1 insertions, 21 deletions

diff --git a/android/source/res/values-de/strings.xml b/android/source/res/values-de/strings.xml
index 6828066524c9..53854e94929d 100644
--- a/android/source/res/values-de/strings.xml
+++ b/android/source/res/values-de/strings.xml
@@ -14,7 +14,6 @@
     <string name="about_license">Lizenz anzeigen</string>
     <string name="about_notice">Hinweise anzeigen</string>
     <string name="about_moreinfo">Weitere Informationen</string>
-    <string name="back_again_to_quit">Zum Beenden noch einmal \'zurück\' drücken</string>
 
     <string name="new_textdocument">Neues Textdokument</string>
     <string name="new_presentation">Neue Präsentation</string>
diff --git a/android/source/res/values-tr/strings.xml b/android/source/res/values-tr/strings.xml
index 357f441a8e86..494e0575d0d1 100644
--- a/android/source/res/values-tr/strings.xml
+++ b/android/source/res/values-tr/strings.xml
@@ -14,7 +14,6 @@
     <string name="about_license">Lisansı Görüntüle</string>
     <string name="about_notice">Bildiriyi Görüntüle</string>
     <string name="about_moreinfo">Daha Fazla Bilgi</string>
-    <string name="back_again_to_quit">Çıkış için geri tuşuna tekrar basınız.</string>
 
     <string name="new_textdocument">Yeni Kelime İşlemci</string>
     <string name="new_presentation">Yeni Sunum</string>
diff --git a/android/source/res/values/strings.xml b/android/source/res/values/strings.xml
index 5cd2c978cef5..ddb396555dfc 100644
--- a/android/source/res/values/strings.xml
+++ b/android/source/res/values/strings.xml
@@ -14,7 +14,6 @@
     <string name="about_license">Show License</string>
     <string name="about_notice">Show Notice</string>
     <string name="about_moreinfo">More Info</string>
-    <string name="back_again_to_quit">Press back again to quit</string>
 
     <string name="new_textdocument">New Text Document</string>
     <string name="new_presentation">New Presentation</string>
diff --git a/android/source/src/java/org/libreoffice/ui/LibreOfficeUIActivity.java b/android/source/src/java/org/libreoffice/ui/LibreOfficeUIActivity.java
index 517aa158035d..f05bcae58a49 100644
--- a/android/source/src/java/org/libreoffice/ui/LibreOfficeUIActivity.java
+++ b/android/source/src/java/org/libreoffice/ui/LibreOfficeUIActivity.java
@@ -191,8 +191,6 @@ public class LibreOfficeUIActivity extends AppCompatActivity implements Settings
     private RecyclerView fileRecyclerView;
     private RecyclerView recentRecyclerView;
 
-    private boolean canQuit = false;
-
     private Animation fabOpenAnimation;
     private Animation fabCloseAnimation;
     private boolean isFabMenuOpen = false;
@@ -440,22 +438,7 @@ public class LibreOfficeUIActivity extends AppCompatActivity implements Settings
         } else if (isFabMenuOpen) {
             collapseFabMenu();
         } else {
-            // only exit if warning has been shown
-            if (canQuit) {
-                super.onBackPressed();
-                return;
-            }
-
-            // show warning about leaving the app and set a timer
-            Toast.makeText(this, R.string.back_again_to_quit,
-                    Toast.LENGTH_SHORT).show();
-            canQuit = true;
-            new Handler().postDelayed(new Runnable() {
-                @Override
-                public void run() {
-                    canQuit = false;
-                }
-            }, 3000);
+            super.onBackPressed();
         }
     }