Accessibility: add first Android version

frontend/drivers/platform_unix.c

@@ -2092,6 +2092,10 @@ static void frontend_unix_init(void *data)
          "getVolumePath", "(Ljava/lang/String;)Ljava/lang/String;");
    GET_METHOD_ID(env, android_app->inputGrabMouse, class,
          "inputGrabMouse", "(Z)V");
+   GET_METHOD_ID(env, android_app->isScreenReaderEnabled, class,
+         "isScreenReaderEnabled", "()Z");
+   GET_METHOD_ID(env, android_app->accessibilitySpeak, class,
+         "accessibilitySpeak", "(Ljava/lang/String;)V");
 
    GET_OBJECT_CLASS(env, class, obj);
    GET_METHOD_ID(env, android_app->getStringExtra, class,
@@ -2961,6 +2965,33 @@ end:
 }
 #endif
 
+#ifdef ANDROID
+static bool is_narrator_running_android(void)
+{
+   JNIEnv *env = jni_thread_getenv();
+   jboolean                  jbool   = JNI_FALSE;
+
+   if (env != NULL)
+      CALL_BOOLEAN_METHOD(env, jbool,
+            g_android->activity->clazz, g_android->isScreenReaderEnabled);
+
+   return jbool == JNI_TRUE;
+}
+
+static bool accessibility_speak_android(int speed,
+      const char* speak_text, int priority)
+{
+   JNIEnv *env = jni_thread_getenv();
+
+   if (env != NULL)
+      CALL_VOID_METHOD_PARAM(env, g_android->activity->clazz,
+            g_android->accessibilitySpeak,
+            (*env)->NewStringUTF(env, speak_text));
+
+   return true;
+}
+#endif
+
 frontend_ctx_driver_t frontend_ctx_unix = {
    frontend_unix_get_env,       /* get_env */
    frontend_unix_init,          /* init */
@@ -3018,8 +3049,8 @@ frontend_ctx_driver_t frontend_ctx_unix = {
    is_narrator_running_unix,     /* is_narrator_running */
    accessibility_speak_unix,     /* accessibility_speak */
 #else
-   NULL,                         /* is_narrator_running */
+   is_narrator_running_android,                         /* is_narrator_running */
-   NULL,                         /* accessibility_speak */
+   accessibility_speak_android,                         /* accessibility_speak */
 #endif
 #ifdef FERAL_GAMEMODE
    frontend_unix_set_gamemode,

frontend/drivers/platform_unix.h

@@ -180,6 +180,9 @@ struct android_app
    jmethodID getVolumePath;
    jmethodID inputGrabMouse;
 
+   jmethodID isScreenReaderEnabled;
+   jmethodID accessibilitySpeak;
+
    struct
    {
       unsigned width, height;

pkg/android/phoenix-common/src/com/retroarch/browser/retroactivity/RetroActivityCommon.java

@@ -17,6 +17,7 @@ import android.os.Bundle;
 import android.os.storage.StorageManager;
 import android.os.storage.StorageVolume;
 import android.system.Os;
+import android.view.accessibility.AccessibilityManager;
 import android.view.HapticFeedbackConstants;
 import android.view.InputDevice;
 import android.view.Surface;
@@ -608,4 +609,16 @@ public class RetroActivityCommon extends NativeActivity
       }
     }
   }
+
+  public boolean isScreenReaderEnabled() {
+    getWindow().getDecorView().announceForAccessibility("Hello world!");
+    AccessibilityManager accessibilityManager = (AccessibilityManager) getSystemService(ACCESSIBILITY_SERVICE);
+    boolean isAccessibilityEnabled = accessibilityManager.isEnabled();
+    boolean isExploreByTouchEnabled = accessibilityManager.isTouchExplorationEnabled();
+    return isAccessibilityEnabled && isExploreByTouchEnabled;
+  }
+
+  public void accessibilitySpeak(String message) {
+    getWindow().getDecorView().announceForAccessibility(message);
+  }
 }