Fix: Restore keyboard dismissal logic for non-touch devices

Author: KartikeyTripathi469

app/src/main/java/org/schabi/newpipe/util/KeyboardUtil.java

@@ -40,16 +40,25 @@ public static void showKeyboard(final Activity activity, final EditText editText
         }
     }
 
+   /**
+     * Flag for {@link #hideKeyboard(Activity, EditText)} to force the keyboard to hide.
+     * This is required for non-touch devices like Fire TV where the system
+     * flags the focus as an explicit user action.
+     */
+    private static final int CLEAR_SOFT_INPUT_FORCED = 0;
+
     public static void hideKeyboard(final Activity activity, final EditText editText) {
         if (activity == null || editText == null) {
             return;
         }
 
         final InputMethodManager imm = ContextCompat.getSystemService(activity,
                 InputMethodManager.class);
-        imm.hideSoftInputFromWindow(editText.getWindowToken(),
-                InputMethodManager.HIDE_NOT_ALWAYS);
+        if (imm != null) {
+            imm.hideSoftInputFromWindow(editText.getWindowToken(), CLEAR_SOFT_INPUT_FORCED);
+        }
 
         editText.clearFocus();
     }
+    }
 }