Merge pull request #2904 from qkolj/back-button

Add configurable behavior of the back button

3 files changed, 74 insertions, 2 deletions

diff --git a/app/src/main/java/de/danoeh/antennapod/activity/MainActivity.java b/app/src/main/java/de/danoeh/antennapod/activity/MainActivity.java
index f506921d2..5595aeac4 100644
--- a/app/src/main/java/de/danoeh/antennapod/activity/MainActivity.java
+++ b/app/src/main/java/de/danoeh/antennapod/activity/MainActivity.java
@@ -27,6 +27,7 @@ import android.view.MenuItem;
 import android.view.View;
 import android.widget.AdapterView;
 import android.widget.ListView;
+import android.widget.Toast;
 
 import com.bumptech.glide.Glide;
 
@@ -123,6 +124,8 @@ public class MainActivity extends CastEnabledActivity implements NavDrawerActivi
 
     private Subscription subscription;
 
+    private long lastBackButtonPressTime = 0;
+
     @Override
     public void onCreate(Bundle savedInstanceState) {
         setTheme(UserPreferences.getNoTitleTheme());
@@ -643,10 +646,40 @@ public class MainActivity extends CastEnabledActivity implements NavDrawerActivi
 
     @Override
     public void onBackPressed() {
-        if(isDrawerOpen()) {
+        if (isDrawerOpen()) {
             drawerLayout.closeDrawer(navDrawer);
-        } else {
+        } else if (getSupportFragmentManager().getBackStackEntryCount() != 0) {
             super.onBackPressed();
+        } else {
+            switch (UserPreferences.getBackButtonBehavior()) {
+                case OPEN_DRAWER:
+                    drawerLayout.openDrawer(navDrawer);
+                    break;
+                case SHOW_PROMPT:
+                    new AlertDialog.Builder(this)
+                        .setMessage(R.string.close_prompt)
+                        .setPositiveButton(R.string.yes, (dialogInterface, i) -> MainActivity.super.onBackPressed())
+                        .setNegativeButton(R.string.no, null)
+                        .setCancelable(false)
+                        .show();
+                    break;
+                case DOUBLE_TAP:
+                    if (lastBackButtonPressTime < System.currentTimeMillis() - 2000) {
+                        Toast.makeText(this, R.string.double_tap_toast, Toast.LENGTH_SHORT).show();
+                        lastBackButtonPressTime = System.currentTimeMillis();
+                    } else {
+                        super.onBackPressed();
+                    }
+                    break;
+                case GO_TO_PAGE:
+                    if (getLastNavFragment().equals(UserPreferences.getBackButtonGoToPage())) {
+                        super.onBackPressed();
+                    } else {
+                        loadFragment(UserPreferences.getBackButtonGoToPage(), null);
+                    }
+                    break;
+                default: super.onBackPressed();
+            }
         }
     }
 
diff --git a/app/src/main/java/de/danoeh/antennapod/preferences/PreferenceController.java b/app/src/main/java/de/danoeh/antennapod/preferences/PreferenceController.java
index 1d93afad9..587b533a2 100644
--- a/app/src/main/java/de/danoeh/antennapod/preferences/PreferenceController.java
+++ b/app/src/main/java/de/danoeh/antennapod/preferences/PreferenceController.java
@@ -227,6 +227,35 @@ public class PreferenceController implements SharedPreferences.OnSharedPreferenc
                     return true;
                 });
 
+        ui.findPreference(UserPreferences.PREF_BACK_BUTTON_BEHAVIOR)
+                .setOnPreferenceChangeListener((preference, newValue) -> {
+                        if (newValue.equals("page")) {
+                            final Context context = ui.getActivity();
+                            final String[] navTitles = context.getResources().getStringArray(R.array.back_button_go_to_pages);
+                            final String[] navTags = new String[3];
+                            System.arraycopy(MainActivity.NAV_DRAWER_TAGS, 0, navTags, 0, 3);
+                            final String choice[] = { UserPreferences.getBackButtonGoToPage() };
+
+                            AlertDialog.Builder builder = new AlertDialog.Builder(context);
+                            builder.setTitle(R.string.back_button_go_to_page_title);
+                            builder.setSingleChoiceItems(navTitles, ArrayUtils.indexOf(navTags, UserPreferences.getBackButtonGoToPage()), (dialogInterface, i) -> {
+                                if (i >= 0) {
+                                    choice[0] = navTags[i];
+                                }
+                            });
+                            builder.setPositiveButton(R.string.confirm_label, (dialogInterface, i) -> {
+                                if (!choice[0].equals(UserPreferences.getBackButtonGoToPage())) {
+                                    UserPreferences.setBackButtonGoToPage(choice[0]);
+                                }
+                            });
+                            builder.setNegativeButton(R.string.cancel_label, null);
+                            builder.create().show();
+                            return true;
+                        } else {
+                            return true;
+                        }
+                    });
+
         if (Build.VERSION.SDK_INT >= 26) {
             ui.findPreference(UserPreferences.PREF_EXPANDED_NOTIFICATION).setVisible(false);
         }
diff --git a/app/src/main/res/xml/preferences_user_interface.xml b/app/src/main/res/xml/preferences_user_interface.xml
index da694b844..1d970a5f7 100644
--- a/app/src/main/res/xml/preferences_user_interface.xml
+++ b/app/src/main/res/xml/preferences_user_interface.xml
@@ -57,4 +57,14 @@
                 android:summary="@string/pref_lockscreen_background_sum"
                 android:title="@string/pref_lockscreen_background_title"/>
     </PreferenceCategory>
+    <PreferenceCategory android:title="@string/behavior">
+        <ListPreference
+                android:entryValues="@array/back_button_behavior_values"
+                android:entries="@array/back_button_behavior_options"
+                android:key="prefBackButtonBehavior"
+                android:title="@string/pref_back_button_behavior_title"
+                android:summary="@string/pref_back_button_behavior_sum"
+                android:defaultValue="default"
+                app:useStockLayout="true"/>
+    </PreferenceCategory>
 </PreferenceScreen>