From 13533a9a4a977d2c06503ae714759a669ea093b9 Mon Sep 17 00:00:00 2001
From: Eric Forkosh <eric@dribbleup.com>
Date: Thu, 18 Apr 2019 12:10:56 -0400
Subject: [PATCH] existsRes function

---
 FS.common.js                                  |  8 +++++++
 .../src/main/java/com/rnfs/RNFSManager.java   | 21 +++++++++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/FS.common.js b/FS.common.js
index fc9ab35e..6470dacb 100755
--- a/FS.common.js
+++ b/FS.common.js
@@ -216,6 +216,14 @@ var RNFS = {
     return RNFSManager.exists(normalizeFilePath(filepath));
   },
 
+    // Android-only
+    existsRes(filename: string) {
+        if (!RNFSManager.existsRes) {
+            throw new Error('existsRes is not available on this platform');
+        }
+        return RNFSManager.existsRes(filename);
+        },
+
   stopDownload(jobId: number): void {
     RNFSManager.stopDownload(jobId);
   },
diff --git a/android/src/main/java/com/rnfs/RNFSManager.java b/android/src/main/java/com/rnfs/RNFSManager.java
index 03fcedfd..9c7b9219 100755
--- a/android/src/main/java/com/rnfs/RNFSManager.java
+++ b/android/src/main/java/com/rnfs/RNFSManager.java
@@ -874,4 +874,25 @@ public Map<String, Object> getConstants() {
 
     return constants;
   }
+
+
+    @ReactMethod
+  public void existsRes(String filename, Promise promise) {
+    try {
+      int res = getResIdentifier(filename);
+      if (res > 0) {
+        promise.resolve(true);
+      } else {
+        promise.resolve(false);
+      }
+    } catch (Exception ex) {
+      ex.printStackTrace();
+      reject(promise, filename, ex);
+    }
+  }
+
+  private int getResIdentifier(String filename) {
+     return getReactApplicationContext().getResources().getIdentifier(filename, "raw", getReactApplicationContext().getPackageName());
+  }
+
 }