(Android) Add back button behavior option

android/native/jni/input_android.c

@@ -367,6 +367,12 @@ static void android_input_poll(void *data)
                         && input_state > 0)
                   {
                   }
+                  else if (g_settings.input.back_behavior == BACK_BUTTON_MENU_TOGGLE)
+                  {
+                     *lifecycle_state |= (1ULL << RARCH_RMENU_TOGGLE);
+                     AInputQueue_finishEvent(android_app->inputQueue, event, handled);
+                     break;
+                  }
                   else
                   {
                      *lifecycle_state |= (1ULL << RARCH_QUIT_KEY);

android/phoenix/res/values/array.xml

@@ -1,5 +1,15 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
+    <string-array name="back_options">
+        <item>Quit</item>
+        <item>Menu toggle</item>
+    </string-array>
+
+    <string-array name="back_options_values">
+        <item>0</item>
+        <item>1</item>
+    </string-array>
+
     <string-array name="aspect_ratios">
         <item>Full screen</item>
         <item>Auto</item>

android/phoenix/res/xml/prefs.xml

@@ -187,6 +187,14 @@
         </PreferenceCategory>
     </PreferenceScreen>
     <PreferenceScreen android:title="Input Settings" >
+       <PreferenceCategory android:title="General" >
+            <ListPreference
+                android:entries="@array/back_options"
+                android:entryValues="@array/back_options_values"
+                android:key="input_back_behavior"
+                android:summary="Select how you want the Back button to behave."
+                android:title="Back behavior" />
+       </PreferenceCategory>
         <PreferenceCategory android:title="Configuration Autodetect" >
             <CheckBoxPreference
                 android:defaultValue="true"

android/phoenix/src/org/retroarch/browser/RetroArch.java

@@ -363,6 +363,7 @@ public class RetroArch extends Activity implements
 		config.setBoolean("video_vsync", prefs.getBoolean("video_vsync", true));
 		config.setBoolean("input_autodetect_enable", prefs.getBoolean("input_autodetect_enable", true));
 		config.setBoolean("input_debug_enable", prefs.getBoolean("input_debug_enable", false));
+		config.setInt("input_back_behavior", Integer.valueOf(prefs.getString("input_back_behavior", "0")));
 		config.setInt("input_autodetect_icade_profile_pad1", Integer.valueOf(prefs.getString("input_autodetect_icade_profile_pad1", "0")));
 		config.setInt("input_autodetect_icade_profile_pad2", Integer.valueOf(prefs.getString("input_autodetect_icade_profile_pad2", "0")));
 		config.setInt("input_autodetect_icade_profile_pad3", Integer.valueOf(prefs.getString("input_autodetect_icade_profile_pad3", "0")));

general.h

@@ -242,6 +242,7 @@ struct settings
       bool debug_enable;
 #ifdef ANDROID
       bool autodetect_enable;
+      unsigned back_behavior;
       unsigned icade_profile[MAX_PLAYERS];
       unsigned icade_count;
 #endif

input/input_common.h

@@ -49,6 +49,14 @@ static inline void input_conv_analog_id_to_bind_id(unsigned index, unsigned id,
 bool input_translate_coord_viewport(int mouse_x, int mouse_y,
       int16_t *res_x, int16_t *res_y, int16_t *res_screen_x, int16_t *res_screen_y);
 
+#ifdef ANDROID
+enum back_button_enums
+{
+   BACK_BUTTON_QUIT = 0,
+   BACK_BUTTON_MENU_TOGGLE,
+};
+#endif
+
 typedef struct rarch_joypad_driver
 {
    bool (*init)(void);

settings.c

@@ -239,6 +239,7 @@ void config_set_defaults(void)
    g_settings.input.debug_enable = input_debug_enable;
 #ifdef ANDROID
    g_settings.input.autodetect_enable = input_autodetect_enable;
+   g_settings.input.back_behavior = BACK_BUTTON_QUIT;
 #endif
 
    for (int i = 0; i < MAX_PLAYERS; i++)
@@ -699,6 +700,7 @@ bool config_load_file(const char *path)
 
 #ifdef ANDROID
    CONFIG_GET_BOOL(input.autodetect_enable, "input_autodetect_enable");
+   CONFIG_GET_INT(input.back_behavior, "input_back_behavior");
    CONFIG_GET_INT(input.icade_profile[0], "input_autodetect_icade_profile_pad1");
    CONFIG_GET_INT(input.icade_profile[1], "input_autodetect_icade_profile_pad2");
    CONFIG_GET_INT(input.icade_profile[2], "input_autodetect_icade_profile_pad3");
@@ -1197,6 +1199,7 @@ bool config_save_file(const char *path)
    config_set_string(conf, "audio_resampler", g_settings.audio.resampler);
 
 #ifdef ANDROID
+   config_set_int(conf, "input_back_behavior", input.back_behavior);
    config_set_int(conf, "input_autodetect_icade_profile_pad1", input.icade_profile[0]);
    config_set_int(conf, "input_autodetect_icade_profile_pad2", input.icade_profile[1]);
    config_set_int(conf, "input_autodetect_icade_profile_pad3", input.icade_profile[2]);